Device and method for measuring thickness of round wire welding strip coatingTechnical Field
The invention relates to a measuring device and a measuring method, in particular to a measuring device and a measuring method for the thickness of a round wire welding strip coating.
Background
The welding strip used for connecting the battery piece on the photovoltaic module is mainly divided into a circular welding strip and a flat rectangular welding strip, and the thickness of a welding auxiliary coating on the surface of the welding strip is an important technical parameter of the welding strip, so that the welding strength, the welding reliability and the battery piece fragment rate are determined. The thickness measurement of the welding strip becomes a necessary inspection item of each batch of welding strips.
For rectangular welding strips, the thickness direction of the coating is perpendicular to the plane direction of the welding strips, so that the measurement result can be accurately and conveniently obtained by adopting a common coating thickness meter.
For the round wire welding strip, the base material is a cylindrical base body, so that the measurement cannot be directly performed by adopting a coating thickness meter. The metallographic method is generally adopted for measurement, but the metallographic method has a plurality of detection steps and takes a long time, one metallographic sample needs to be subjected to the steps of cutting, fixing, preparing mosaic materials, mosaic, polishing, measuring and the like, and although a plurality of samples to be measured are inlaid in one die for synchronous measurement during actual measurement, the metallographic method still takes a long time even so, and the detection time of the metallographic sample generally needs about 70 minutes. In the metallographic detection process, more and basically manual operations are adopted, errors are possibly introduced in each process, such as non-perpendicular cutting surfaces and samples, cross section deformation caused by cutting, incomplete vertical of embedded samples, non-horizontal bottom surfaces of polished metallographic samples, deformation of tin layer profile caused by incomplete filling of embedded materials, and finally manual scribing measurement of shot pictures. Therefore, the metallographic method is a method with high requirements for detection personnel, and a skilled operation is required for detecting the result so as to have good stability.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a device and a method for measuring the thickness of a round wire welding strip coating.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a round wire solder strip coating thickness measuring device, comprising:
the welding strip fixing column is a linear regular polygon column body, a penetrating round hole is formed in the central axis of the column body, a slit communicated with the round hole is formed in the column body of the welding strip fixing column, and one end of a circular wire welding strip to be tested is placed in the round hole through the slit;
the coating thickness measuring instrument comprises a measuring platform and a measuring probe, wherein the welding strip fixing column is placed on the measuring platform, the axis of the welding strip fixing column is parallel to the plane of the measuring platform, and the part to be measured of the round wire welding strip is placed on the measuring probe;
the welding strip pressing block is provided with at least one limiting groove on the surface, the welding strip pressing block is arranged on the measuring probe, and the limiting groove is matched with a round wire welding strip on the measuring probe.
Compared with the prior art, the method can rapidly detect the coating thickness of the round wire welding strip, has the advantages of simple measurement method, fewer steps, difficult error introduction, high measurement accuracy reaching +/-0.1 mu m, high long-term stability of the measurement device, rapid derivation of measurement data by a coating thickness meter, and contribution to statistical analysis of the data.
Further, one end face of the welding strip fixing column is provided with a welding strip pressing mechanism, the welding strip pressing mechanism comprises a pin shaft, a pressing ring and a pressure spring, the pin shaft is vertically arranged on the end face of the welding strip fixing column, the pressing ring and the pressure spring are sleeved on the pin shaft, and the pressure spring presses the pressing ring on the end face of the welding strip fixing column.
Further, arc-shaped grooves matched with the round wire welding strips are formed in the contact surfaces of the pressing rings and the welding strip fixing columns.
By adopting the preferable scheme, the position of the round wire welding strip relative to the welding strip fixing column can be better fixed, and the accuracy of the measuring result is improved.
Further, the polygonal column surface of the welding strip fixing column is provided with marks for sequencing the column surfaces, and the marks are in a concave state relative to the column surfaces.
By adopting the preferable scheme, the method can help a measurer to orderly measure, prevent confusion and ensure accurate measurement results.
Further, a plurality of limit grooves are formed in the welding strip pressing block, and the opening size and the groove depth of each limit groove are matched with the round wire welding strips with different specifications.
Further, the opening of the limiting groove is the same as the groove depth in size, and the opening of the limiting groove is 0.08-0.15mm larger than the diameter of the round wire welding strip matched with the limiting groove.
By adopting the preferable scheme, the position of the round wire welding strip can be regulated, the measurement midpoint is conveniently found, the size of the opening of the limiting groove is slightly larger than the diameter of the round wire welding strip, and the round wire welding strip can be ensured to keep free rotation in the limiting groove.
Further, a limiting block is arranged on the measuring platform, the welding strip fixing column is placed on the limiting block, and the limiting block can limit the end position of the welding strip fixing column.
By adopting the preferable scheme, the measuring position of the round wire welding strip can be kept stable.
Further, the bottom of the limiting block is also provided with a translation mechanism, and the translation mechanism can drive the limiting block to translate along the axis direction of the welding strip fixing column.
By adopting the preferable scheme, the round wire welding strip can be stably translated to measure the thickness of the coating at different positions in the length direction.
A method for measuring thickness of a round wire welding strip coating comprises the following steps:
step 1, placing one end of a round wire welding strip to be tested into a round hole through a slit of a welding strip fixing column, exposing a small section of one end of the round wire welding strip to be tested to one end face of the welding strip fixing column, and bending the exposed small section of round wire welding strip to enable the small section of round wire welding strip to be attached to the end face of the welding strip fixing column;
step 2, placing the welding strip fixing column on a measuring platform of a coating thickness measuring instrument, and placing the other end of the round wire welding strip to be measured on a measuring probe;
step 3, placing the welding strip pressing block on a measuring probe, so that the round wire welding strip to be measured is limited in a limiting groove of the welding strip pressing block;
step 4, adjusting the position of a measuring point on an operation interface of the coating thickness measuring instrument to enable the measuring point to fall in the middle of a sample to be measured, adjusting the focal length, and measuring after the focal length is clear;
step 5, rotating the welding strip fixing column along the central axis, and sequentially arranging all cylindrical surfaces of the welding strip fixing column polyhedron on a measuring platform, wherein each rotation is measured according to the step 4 until all the cylindrical surfaces are completely measured;
and 6, obtaining coating thickness data of each equal division point of the circle of the round wire welding strip from a coating thickness measuring instrument.
By adopting the preferable scheme, the coating thickness of the round wire welding strip can be rapidly detected, the measuring method is simple, the steps are few, errors are not easy to introduce, the measuring precision can reach +/-0.1 mu m, the long-term stability of the measuring device is high, and the coating thickness meter can rapidly derive the measured data, so that the statistical analysis of the data is facilitated.
Further, the round wire welding strip can be translated through the translation mechanism, and coating thickness data of different positions of the round wire welding strip can be measured.
By adopting the preferable scheme, the round wire welding strip can be stably translated to measure the thickness of the coating at different positions in the length direction.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of an embodiment of a solder strip fixing post according to the present invention;
FIG. 3 is a schematic view of one embodiment of a weld bead block according to the present invention;
fig. 4 is a schematic structural view of another embodiment of the solder strip fixing post of the present invention.
Names of the corresponding parts indicated by numerals and letters in the drawings:
1-welding a fixing column; 11-round holes; 12-slit; 13-pin shafts; 14-a compression ring; 15-a compression spring; 21-a measurement platform; 22-measuring probe; 3-welding a belt pressing block; 31-limit grooves; 4-a round wire welding belt; and 5-limiting blocks.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to achieve the object of the present invention, one embodiment of the present invention is: as shown in fig. 1-3, a device for measuring thickness of a round wire bonding tape coating comprises:
the welding strip fixing column 1 is a linear regular polygon column body, a penetrating round hole 11 is formed in the central axis of the column body, a slit 12 communicated with the round hole 11 is formed in the column body of the welding strip fixing column 1, and one end of a circular wire welding strip 4 to be measured penetrates through the slit 12 and is placed in the round hole 11;
the coating thickness measuring instrument comprises a measuring platform 21 and a measuring probe 22, wherein a welding strip fixing column 1 is placed on the measuring platform 21, the axis of the welding strip fixing column 1 is parallel to the measuring platform 21, and a part to be measured of the round wire welding strip 4 is placed on the measuring probe 22;
the welding strip pressing block 3 is provided with at least one limiting groove 31 on the surface, the welding strip pressing block 3 is arranged on the measuring probe 22, and the limiting groove 31 is matched with the round wire welding strip 4 on the measuring probe 22.
The coating thickness measuring instrument is an instrument capable of rapidly measuring the thickness of the rectangular welding strip coating in the prior art, namely, the thickness of the coating in the irradiation direction can be rapidly measured, and the instrument can be a laser coating thickness measuring instrument or an X-ray coating thickness measuring instrument, and is not limited by the invention.
The beneficial effects of the invention are as follows: the coating thickness of the round wire welding strip 4 can be rapidly detected, the measuring method is simple, the steps are few, errors are not easy to introduce, the measuring precision can reach +/-0.1 mu m, the long-term stability of the measuring device is high, the coating thickness meter can rapidly derive measuring data, and statistical analysis of the data is facilitated.
As shown in fig. 4, in other embodiments of the present invention, one end surface of the welding strip fixing post 1 is provided with a welding strip compressing mechanism, the welding strip compressing mechanism comprises a pin 15, a compression ring 14 and a compression spring 13, the pin 15 is vertically arranged on the end surface of the welding strip fixing post 1, the compression ring 14 and the compression spring 13 are sleeved on the pin 15, and the compression ring 14 is compressed on the end surface of the welding strip fixing post 1 by the compression spring 13; the contact surface of the pressing ring 14 and the welding strip fixing column 1 is provided with an arc-shaped groove matched with the round wire welding strip 4. The beneficial effects of adopting above-mentioned technical scheme are: the position of the round wire welding strip 4 relative to the welding strip fixing column 1 can be better fixed, and the accuracy of the measuring result is improved.
In other embodiments of the present invention, the polygonal cylindrical surface of the solder strip fixing post 1 is provided with a reference numeral for ordering the cylindrical surfaces, and the reference numeral is in a concave state relative to the cylindrical surface. The beneficial effects of adopting above-mentioned technical scheme are: the method can help the measurer to measure orderly, prevent confusion and ensure accurate measurement results.
In other embodiments of the present invention, the welding strip pressing block 3 is provided with a plurality of limiting grooves 31, and the opening size and the groove depth of each limiting groove 31 are matched with the round wire welding strips with different specifications; the opening of the limiting groove 31 is the same as the groove depth, and the opening of the limiting groove 31 is 0.08-0.15mm larger than the diameter of the round wire welding strip matched with the limiting groove. The beneficial effects of adopting above-mentioned technical scheme are: the position of the round wire welding strip can be regulated, the measurement midpoint is conveniently found, the opening size of the limiting groove is slightly larger than the diameter of the round wire welding strip, and the round wire welding strip can be ensured to keep free rotation in the limiting groove.
In other embodiments of the present invention, a stopper 5 is provided on the measuring platform 21, and the solder strip fixing post 1 is placed on the stopper 5, and the stopper 5 may define the end position of the solder strip fixing post 1. The beneficial effects of adopting above-mentioned technical scheme are: the measuring position of the round wire bonding belt 4 can be kept stable.
In other embodiments of the present invention, a translation mechanism is further disposed at the bottom of the limiting block 5, and the translation mechanism can drive the limiting block 5 to translate along the axis direction of the welding strip fixing column 1. The beneficial effects of adopting above-mentioned technical scheme are: the round wire bonding tape can be stably translated to measure the thickness of the coating at different positions in the length direction.
A method for measuring thickness of a round wire welding strip coating comprises the following steps:
step 1, placing one end of a round wire welding strip to be tested into a round hole through a slit of a welding strip fixing column, exposing a small section of one end of the round wire welding strip to be tested to one end face of the welding strip fixing column, and bending the exposed small section of round wire welding strip to enable the small section of round wire welding strip to be attached to the end face of the welding strip fixing column;
step 2, placing the welding strip fixing column on a measuring platform of a coating thickness measuring instrument, and placing the other end of the round wire welding strip to be measured on a measuring probe;
step 3, placing the welding strip pressing block on a measuring probe, so that the round wire welding strip to be measured is limited in a limiting groove of the welding strip pressing block;
step 4, adjusting the position of a measuring point on an operation interface of the coating thickness measuring instrument to enable the measuring point to fall in the middle of a sample to be measured, adjusting the focal length, and measuring after the focal length is clear;
step 5, rotating the welding strip fixing column along the central axis, and sequentially arranging all cylindrical surfaces of the welding strip fixing column polyhedron on a measuring platform, wherein each rotation is measured according to the step 4 until all the cylindrical surfaces are completely measured;
and 6, obtaining coating thickness data of each equal division point of the circle of the round wire welding strip from a coating thickness measuring instrument.
The beneficial effects of adopting above-mentioned technical scheme are: the method can rapidly detect the thickness of the coating of the round wire welding strip, has simple measurement method, few steps, is not easy to introduce errors, has the measurement accuracy of +/-0.1 mu m, has high long-term stability of the measurement device, can rapidly derive the measurement data by the coating thickness meter, and is favorable for statistical analysis of the data.
The following electroplating welding wires with better coating thickness uniformity are respectively used for measuring the coating thickness by adopting the measuring device (the welding strip fixing column is a regular dodecagon column) and a metallographic method, and the obtained data are as follows:
| sequence number | The invention measuring device (mum) | Metallographic method (mum) |
| 1 | 12.1 | 10.93 |
| 2 | 12.4 | 11.32 |
| 3 | 12.2 | 10.7 |
| 4 | 12.4 | 9.81 |
| 5 | 12.1 | 11.11 |
| 6 | 12.2 | 12.51 |
| 7 | 12.2 | 12.54 |
| 8 | 12.3 | 12.76 |
| 9 | 12.3 | 13.6 |
| 10 | 12.1 | 13.73 |
| 11 | 12.2 | 10.1 |
| 12 | 12.2 | 8.13 |
| Maximum value | 12.4 | 13.73 |
| Minimum value | 12.1 | 8.13 |
| Mean value of | 12.2 | 11.43 |
As can be seen from the data in the table, the measurement result of the measuring device is more matched with the characteristics of the electroplated solder strip, and the measurement result is stable and accurate; the metallographic method has unstable measurement value, large deviation and inaccurate measurement result.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.