CN219915220U - Small-size chip solder joint shearing force testing device - Google Patents
Small-size chip solder joint shearing force testing device Download PDFInfo
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- CN219915220U CN219915220U CN202321002819.2U CN202321002819U CN219915220U CN 219915220 U CN219915220 U CN 219915220U CN 202321002819 U CN202321002819 U CN 202321002819U CN 219915220 U CN219915220 U CN 219915220U
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- 238000012360 testing method Methods 0.000 title claims abstract description 106
- 238000010008 shearing Methods 0.000 title claims abstract description 35
- 229910000679 solder Inorganic materials 0.000 title claims description 7
- 238000003466 welding Methods 0.000 claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000000418 atomic force spectrum Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a small-size chip welding spot shearing force testing device, which comprises a handheld dynamometer, a testing jig and an amplifying device, wherein one end of the testing jig is connected with a handheld dynamometer sensor, the handheld dynamometer displays a thrust value at the top end of the testing jig, and the amplifying device is used for observing the section conditions of a chip and a welding spot; the testing jig comprises a cylindrical column body, one end, in contact with a welding point of the chip, of the column body is inwards contracted into a round table, and an arc surface is upwards arranged at the top end of the round table. The utility model has simple equipment, low manufacturing cost and good portability, and can be applied to substrates with various sizes.
Description
Technical Field
The utility model relates to the technical field of chip processing, in particular to a device for testing small-size chip welding spot shearing force.
Background
With the continuous progress of technology, electronic components are steadily advancing toward miniaturization, but miniaturization of devices means that the volume of chips becomes smaller and the arrangement density of chips becomes greater during processing. The magnitude of the shear force between the die and the solder joint is a representative value of the die bond strength, and in order to obtain the shear force value of the die, a precise shear force test device is generally used to perform a shear force test on the die on the PCB substrate.
However, the shear force of a chip is generally affected by many factors, such as shear height, shear rate, etc., which are all controlled by a typical shear device in order to obtain comparable values of shear force. However, in the actual test, the test result still has strong randomness, and the effective value of the shearing force can be obtained after the test result is subjected to statistical distribution.
Shear force device the shear force test process mainly focuses on the shear force test values, while displacement-force curve data and the like are only used for assisting in analyzing fracture modes, so that a large shear force device is not needed for recording other data except the test values when an actual chip is subjected to shear force test. In addition, in actual use, although the information of the shearing process can be accurately recorded, a lot of information in actual use is not well utilized, and finally, the shearing force test only obtains a thrust range, so that the shearing force test has more irrelevant data and complicated data processing.
The large shear force equipment is high in price, occupies a large space and is not easy to move; the equipment stage for chip shearing has limited travel, and for chips with larger distribution sizes, testing is troublesome.
Disclosure of Invention
In order to overcome the defects of high price, large occupied space and troublesome test of chips with large distribution sizes of large shearing force equipment in the prior art, the utility model provides a device for testing the welding spot shearing force of a small-size chip.
The technical scheme of the utility model is as follows:
the device for testing the small-size chip welding spot shearing force comprises a handheld dynamometer, a testing jig and an amplifying device, wherein one end of the testing jig is connected with a handheld dynamometer sensor, the handheld dynamometer displays a thrust value at the top end of the testing jig, and the amplifying device is used for observing the section conditions of a chip and a welding spot;
the testing jig comprises a cylindrical column body, one end, in contact with a welding point of the chip, of the column body is inwards contracted into a round table, and an arc surface is upwards arranged at the top end of the round table.
Further, in an embodiment, the arc surface is a spherical arc surface.
Further, in an embodiment, the shaft is cylindrical.
Further, in an embodiment, the magnification device is a microscope.
Further, in an embodiment, the test fixture is detachably connected to the hand-held load cell sensor.
Further, in an embodiment, the test jig is plural, and the test jig shaft thicknesses are different.
Further, in an embodiment, the test device for small-size die pad shear force can be used for testing various-size die pad shear force by replacing different test tools.
Further, in an embodiment, the test fixture is made of stainless steel
According to the utility model, the maximum value of the shear force test is obtained through the handheld dynamometer, and the real shear force result can be accurately obtained by observing the fracture section analysis fracture mode under the assistance of the microscope, and the utility model has the beneficial effects that:
1) The shear force test of the chip is used for representing the average overall breaking strength, and for small-size chips, the influence of bending moment is smaller, the effect generated by the force applied by the test jig is similar to a pure shearing effect, and the actual shearing strength can be reflected, so that high-precision equipment is not required for controlling the height and the shearing speed, the shearing force value can be measured by means of a handheld dynamometer, large equipment investment is not required, and the cost is low.
2) The portability of the hand-held load cell allows it to be applied to substrates of various sizes.
3) The damage position in the pure shearing state is the position with the weakest shearing capability, so that the dangerous section can be obtained by observing the damage section, the damage section condition can be observed by using a microscope to enlarge the section, the damage section is obtained without relying on complex displacement-time-force curve analysis, and the result is simple and clear.
Drawings
FIG. 1 is a schematic view of an embodiment of a small-sized chip bonding-pad shear force testing apparatus according to the present utility model;
FIG. 2 is a schematic cross-sectional view of a test fixture of the present utility model;
FIG. 3 is a schematic diagram of the top end of the test fixture and the die in the small-sized die pad shear force testing apparatus of the present utility model.
In the figure, 1, a hand-held dynamometer; 2. testing a jig; 3. an amplifying device; 4. a substrate; 5. a chip; 6. and welding spots.
Description of the embodiments
The utility model is further described below with reference to the drawings and embodiments. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like are used in this specification for purposes of illustration only. In the description of the present utility model, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. The terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or groups thereof may be present or added.
Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the utility model described below can be combined with one another as long as they do not conflict with one another.
As shown in fig. 1 and 2, the utility model provides an embodiment of a small-size chip welding spot shearing force testing device, which comprises a handheld dynamometer 1, a testing jig 2 and an amplifying device 3, wherein one end of the testing jig 2 is connected with a sensor of the handheld dynamometer 1, the handheld dynamometer 1 displays the thrust value at the top end of the testing jig 2, and the amplifying device 3 is used for observing the section conditions of a chip and a welding spot. The test fixture 2 comprises a straight cylindrical column body, one end of the column body, which is contacted with a chip welding spot, is inwards contracted into a round table, and the top end of the round table is upwards provided with a spherical arc surface. The straight and long test fixture is convenient for holding and pushing the test fixture 2 to exert force, and the top end can not contact with a non-test chip of the accessory; the spherical arc surface can realize that external force is applied to a plurality of angles for measurement, when the front end of the test jig 2 is more than one fourth of the area of a chip, the concentrated force of the test jig 2 on the chip is not obvious, and similar plane test force is generated during test, namely, the application and test of the shearing force of the chip are realized.
The shear force test of the chip is used for representing the breaking strength of the average whole, and for small-size chips, the influence of bending moment is small, the effect generated by the force applied by the test jig 2 is similar to a pure shear effect, and the actual shear strength can be reflected, so that the height and the shear speed are not required to be controlled by high-precision equipment, and the shear force value can be obtained by testing by combining the test jig 2 with the handheld dynamometer 1. And because the small-size chip is small in stress area, the force applied by the test fixture 2 is approximately equal to the force on the surface, and the small-size chip is small in welding area, so that the difference of the welding surface areas is not obvious, the test reading can basically represent the welding force level of an actual welding spot, and therefore, the shearing force value can be measured by the handheld dynamometer 1, large equipment investment is not needed, and the cost is low. The breaking position in the pure shearing state is the position with the weakest shearing capability, so that the dangerous section can be obtained by observing the breaking section without relying on complex displacement-time-force curve analysis. The utility model uses the amplifying device 3 to amplify and observe the test welding spot, when the welding spot has chip residue, it represents that the chip has brittle failure, the weakest position of the structure is the chip itself, at this time the test value is effective and equal to the maximum reading value; when the welding spot has no chip residue, the welding spot shows that the welding flux has insufficient shearing capability, and toughness fracture possibly occurs in the shearing process, so that the test is equally effective, and the shearing force value is equal to the maximum reading value; when the welding spot is separated from the substrate together with the chip, the welding effect of the welding spot is extremely poor and is unqualified.
In other embodiments, the shaft of the test fixture 2 may be a polygonal prism to prevent the prism from easily touching the elements at other positions of the test chip, and the more the prism edges, the better.
In one embodiment, the amplifying device 3 is a microscope, so as to amplify the cross sections of the chip and the welding spot, so that the condition observation of the chip and the welding spot cross section is clear, whether the chip is welded to be qualified or not is judged according to the cross section state, and the shearing force between the chip and the welding spot is obtained. The microscope has large magnification, and the image is clear and easy to observe.
In an embodiment, the test fixture 2 is detachably connected with the sensor of the handheld dynamometer 1, and the test fixture 2 can be replaced when the top end of the test fixture 2 is severely worn or damaged.
In one embodiment, the number of test tools 2 is plural, and the thicknesses of the columns of the test tools 2 are different. The test fixture 2 with different specifications is replaced, and the test device for the small-size chip welding spot shearing force can be used for testing the shearing force of the chip welding spots with various sizes. The front end of the test fixture is spherical, external force can be applied at a plurality of angles for measurement, when the front end of the test fixture 2 is more than one fourth of the area of a chip, the concentrated force of the test fixture 2 on the chip is not obvious, and similar plane test force is generated during test, so that the application and test of the shearing force of the chip are realized. For testing of chips with different sizes, the front end surface of the testing jig 2 needs to be adjusted according to the chip area, so that the testing device for the small-size chip welding spot shearing force of the testing jig 2 with different sizes can be suitable for testing of chips with different sizes.
In one embodiment, the test fixture 2 is made of stainless steel.
As shown in fig. 3, when the device for testing the shearing force of the welding spot of the small-size chip is used for testing the shearing force, firstly, a testing jig 2 with a proper specification is fixed on a sensor of the handheld dynamometer 1, after a substrate 4 is fixed, the front end of the testing jig 2 is aligned to a welding spot 6 on the side surface of the chip 5, the dynamometer is slowly pushed by hands and is observed for reading, a microscope is used for observing a fracture section, and the maximum value of the reading of the dynamometer and the fracture section are recorded to complete the test of one chip 5.
The utility model has simple equipment, low manufacturing cost and good portability, so that the utility model can be applied to substrates with various sizes, and the replacement of the test tools 2 with different specifications can be suitable for chips with various sizes.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the implementation of the utility model is not limited by the above manner, and it is within the scope of the utility model to apply the inventive concept and technical solution to other situations as long as various improvements made by the inventive concept and technical solution are adopted, or without any improvement.
Claims (7)
1. The device for testing the small-size chip welding spot shearing force is characterized by comprising a handheld dynamometer, a testing jig and an amplifying device, wherein one end of the testing jig is connected with a handheld dynamometer sensor, the handheld dynamometer displays a thrust value at the top end of the testing jig, and the amplifying device is used for observing the section conditions of a chip and a welding spot;
the testing jig comprises a cylindrical column body, one end, in contact with a welding point of the chip, of the column body is inwards contracted into a round table, and an arc surface is upwards arranged at the top end of the round table.
2. The device for testing the shear force of a small-sized chip solder joint according to claim 1, wherein the circular arc surface is a spherical arc surface.
3. The small-sized chip bonding pad shearing force testing device according to claim 2, wherein said column body is cylindrical.
4. The small-scale chip solder joint shear force testing device of claim 1, wherein the magnifying device is a microscope.
5. The small-scale chip solder joint shear force testing device of claim 1, wherein the testing jig is detachably connected to the hand-held load cell sensor.
6. The apparatus of claim 5, wherein the test tools are plural and the test tools have different column thicknesses.
7. The apparatus for testing small-sized chip solder joint shear force as in any of claims 1-6, wherein the test fixture is stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321002819.2U CN219915220U (en) | 2023-04-28 | 2023-04-28 | Small-size chip solder joint shearing force testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321002819.2U CN219915220U (en) | 2023-04-28 | 2023-04-28 | Small-size chip solder joint shearing force testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219915220U true CN219915220U (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321002819.2U Active CN219915220U (en) | 2023-04-28 | 2023-04-28 | Small-size chip solder joint shearing force testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN219915220U (en) |
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2023
- 2023-04-28 CN CN202321002819.2U patent/CN219915220U/en active Active
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