CN216309608U - Resistance spot welding cross sample fatigue test device - Google Patents
Resistance spot welding cross sample fatigue test device Download PDFInfo
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- CN216309608U CN216309608U CN202122018555.7U CN202122018555U CN216309608U CN 216309608 U CN216309608 U CN 216309608U CN 202122018555 U CN202122018555 U CN 202122018555U CN 216309608 U CN216309608 U CN 216309608U
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Abstract
The utility model provides a cross sample fatigue test device of resistance spot welding, belongs to fatigue test equipment technical field for carry out cross sample fatigue test to the resistance spot welding solder joint. The technical scheme is as follows: go up anchor clamps and lower anchor clamps and be the cuboid steel bloom respectively, ascending arch in the middle of the last plane of cuboid steel bloom, there is the bolted connection hole respectively at cuboid steel bloom both ends, bellied central authorities have the holding rod screw hole, the lower part of going up holding rod and lower holding rod is connected with the holding rod screw hole of the protruding central authorities of last anchor clamps and lower anchor clamps respectively, the upper surface of placing at the last strip shaped plate of cross sample of going up anchor clamps, the lower surface at the lower strip shaped plate of cross sample is placed to lower anchor clamps, the bolt is with last anchor clamps, lower anchor clamps and cross sample fixed connection, go up the upper end of holding rod and lower holding rod centre gripping respectively on two of fatigue test machine are kept silent. The utility model can carry out the fatigue test of the welding spot cross sample on a common tensile testing machine, thereby improving the testing efficiency and reducing the testing cost.
Description
Technical Field
The utility model relates to a sample device used for a cross-shaped sample fatigue test on resistance spot welding spots, and belongs to the technical field of fatigue test equipment.
Background
Resistance spot welding is widely applied to the manufacturing process of automobile parts and finished automobiles as an efficient connecting mode, and the development of the modern automobile industry is promoted to a great extent. The welding spot is under the action of alternating load in the service process, so the fatigue performance of the welding spot is an important index of the engineering application. Due to the welding characteristics, a large number of tests show that compared with base materials, the fatigue failure resistance of the whole structure can be greatly reduced due to the severe stress concentration at the welding joint, so that the structure connected through spot welding often fails and breaks at the welding joint during working, the local failure of the welding spot can reduce various functional indexes of the whole vehicle, including rigidity, vibration, noise and vehicle durability, and the fatigue strength of the welding spot is directly related to the quality and safety of a vehicle body. The common geometric forms of the welding spot fatigue test sample comprise three types of tension-shear, cross-stretching and tearing-stretching, and due to the particularity of the test sample, the common fatigue testing machine cannot clamp the test sample, but the special tensile testing machine is expensive, complex in clamp structure and inconvenient to operate, so that the testing efficiency is greatly reduced. Therefore, a resistance spot welding spot cross-shaped sample fatigue test device needs to be researched and developed, and a steel plate resistance spot welding spot fatigue test is completed on a common fatigue test machine.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a resistance spot welding cross sample fatigue test device which is simple in structure and convenient to operate and can be used for carrying out fatigue test on a resistance spot welding spot cross sample by using a common fatigue test machine.
The technical scheme for solving the technical problems is as follows:
a fatigue test device for a resistance spot welding cross sample comprises an upper clamp, a lower clamp, an upper clamping bar, a lower clamping bar, bolts and nuts, wherein the upper clamp and the lower clamp are of the same structure, the upper clamp and the lower clamp are respectively rectangular steel blocks, the middle of the upper plane of each rectangular steel block is upwards protruded, bolt connecting holes which are vertically downwards are respectively arranged on the rectangular steel blocks at two ends of each protrusion, a threaded hole of the clamping bar which is vertically downwards is arranged in the center of each protrusion, the upper clamping bar and the lower clamping bar are respectively cylindrical steel bars, the lower parts of the upper clamping bar and the lower clamping bar are respectively provided with threads, the threads at the lower parts of the upper clamping bar and the lower clamping bar are respectively connected with the threaded holes of the clamping bars at the centers of the upper clamp and the lower clamp, the bottom surface of the rectangular steel block of the upper clamp is placed on the upper surface of an upper strip-shaped plate of the cross sample, the bottom surface of the rectangular steel block of the lower clamp is placed on the lower surface of a lower strip-shaped plate of the cross sample, the upper strip-shaped plate and the lower strip-shaped plate of the cross-shaped sample are respectively provided with a connecting hole at two ends thereof corresponding to the bolt connecting holes at two ends of the upper clamp and the lower clamp, a bolt and a nut are respectively fixedly connected with the connecting holes of the cross-shaped sample through the bolt connecting holes of the upper clamp and the lower clamp, and the upper ends of the upper clamping rod and the lower clamping rod are respectively clamped on two jaws of the fatigue testing machine.
Above-mentioned cross sample fatigue test device of resistance spot welding, it also has the sample fixed plate, the sample fixed plate is square steel sheet, four sample fixed plates are located the both ends of the cuboid steel bloom of anchor clamps and lower anchor clamps respectively, it is corresponding with the bolted connection hole at last anchor clamps and lower anchor clamps both ends respectively to have the fixed orifices on the sample fixed plate, the sample fixed plate is placed the lower surface at the last strip shaped plate of cross sample and the upper surface of the lower strip shaped plate of cross sample respectively, bolt and nut are respectively through last anchor clamps, the bolted connection hole of lower anchor clamps is connected the cross sample clamp tightly with the fixed orifices of sample fixed plate.
According to the resistance spot welding cross-shaped sample fatigue test device, the centers of the bottom surfaces of the rectangular steel blocks of the upper clamp and the lower clamp are provided with the circular grooves, and the circular grooves are opposite to welding spots at the center of the cross-shaped sample.
According to the fatigue test device for the resistance spot welding cross-shaped sample, the lower bottom surfaces of the rectangular steel blocks of the upper clamp and the lower clamp are respectively provided with the tooth shapes, and the tooth shapes of the lower bottom surfaces of the upper clamp and the lower clamp are respectively opposite to the upper surface of the upper strip-shaped plate and the lower surface of the lower strip-shaped plate of the cross-shaped sample.
The utility model has the beneficial effects that:
the upper clamp and the lower clamp are respectively and independently connected with the upper strip-shaped plate and the lower strip-shaped plate of the cross sample, the upper strip-shaped plate and the lower strip-shaped plate of the cross sample are connected through welding spots, and the upper clamp and the lower clamp are respectively clamped on two jaws of a fatigue testing machine through the upper clamping rod and the lower clamping rod, so that the fatigue test can be performed on the welding spots of the cross sample.
The utility model has simple structure, convenient use, good reliability and strong stability, can carry out the fatigue test of the welding spot cross sample on a common tensile testing machine, greatly improves the testing efficiency, reduces the costs of manufacture, maintenance and repair and the like, provides technical support for improving the welding quality of automobile manufacture, and has obvious economic benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention (lacking a sample holding plate and bolts, nuts above the lower clamp);
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a top view of a cross-shaped specimen;
FIG. 4 is a front view of the lower clamp;
FIG. 5 is a top view of the lower clamp;
FIG. 6 is a left side view of the lower clamp;
FIG. 7 is a schematic plan view of a sample platen;
FIG. 8 is a plot fitted using least squares method using finite life span data;
FIG. 9 is a graph of fatigue limit of three infinite life spans of 1.5KN, 1.7KN and 1.9KN measured by a step method;
fig. 10 is a graph of maximum force versus life.
The figures are labeled as follows: the device comprises an upper clamping rod 1, an upper clamp 2, a lower clamp 3, a lower clamping rod 4, a sample fixing plate 5, a bolt 6, a nut 7, a gasket 8, an upper strip-shaped plate 9, a lower strip-shaped plate 10, a welding spot 11, a bolt connecting hole 12, a tooth form 13, a clamping rod threaded hole 14, a circular groove 15, a connecting hole 16 and a fixing hole 17.
Detailed Description
The utility model consists of an upper clamp 2, a lower clamp 3, an upper clamping rod 1, a lower clamping rod 4, a sample fixing plate 5, a bolt 6, a nut 7 and a gasket 8.
The upper clamp 2 and the lower clamp 3 of the utility model have the same structure, and are placed in opposite directions when in use.
Fig. 4, 5, 6 show that lower fixture 3 is the cuboid steel bloom, and ascending arch in the middle of the last plane of cuboid steel bloom has perpendicular decurrent bolted connection hole 12 on the cuboid steel bloom of protruding both ends respectively, and bellied central authorities have perpendicular decurrent holding rod screw hole 14, and bolted connection hole 12 is used for connecting the cross sample, and holding rod screw hole 14 is used for connecting holding rod 4 down.
Fig. 4, 5 and 6 show that the center of the bottom surface of the rectangular steel block of the lower clamp 3 is provided with a circular groove 15, and the circular groove 15 is opposite to the welding point 11 at the center of the cross-shaped test sample, so that the lower clamp 3 cannot contact the welding point 11, and the test result is prevented from being influenced.
Fig. 4, 5 and 6 show that the lower bottom surface of the rectangular steel block of the lower clamp 3 is respectively provided with a tooth form 13, and the tooth form 13 is opposite to the lower surface of the lower strip-shaped plate 10 of the cross-shaped sample, so that the cross-shaped sample and the lower clamp 3 cannot slide relatively in the fatigue test process, and the clamping reliability is ensured.
Fig. 1 and 2 show that the upper clamping rod 1 and the lower clamping rod 4 are respectively a cylindrical steel rod, the lower parts of the upper clamping rod 1 and the lower clamping rod 4 are respectively provided with threads, the threads at the lower parts of the upper clamping rod 1 and the lower clamping rod 4 are respectively connected with a clamping rod threaded hole 14 at the center of the projection of the upper clamp 2 and the lower clamp 3, and the upper ends of the upper clamping rod 1 and the lower clamping rod 4 are respectively clamped on two jaws of the fatigue testing machine.
Fig. 1, 2 and 3 show that the cross sample consists of an upper strip 9 and a lower strip 10. The upper strip-shaped plate 9 and the lower strip-shaped plate 10 are rectangular steel strip bars respectively, the upper strip-shaped plate 9 and the lower strip-shaped plate 10 are placed in a crossed mode and are connected in a welding mode through welding spots 11. The upper surface at last bar 9 is placed to the bottom surface of the cuboid steel block of last anchor clamps 2, the lower surface at bar 10 is placed to the bottom surface of the cuboid steel block of lower anchor clamps 3, it is corresponding with the bolted connection hole 12 at last anchor clamps 2 and 3 both ends of lower anchor clamps respectively to go up the both ends of bar 9 and bar 10 down, bolt 6 and nut 7 are respectively through last anchor clamps 2, the bolted connection hole 12 of lower anchor clamps 3 and the connected hole 16 fixed connection of last bar 9 and bar 10 down.
Fig. 1, 7 show, sample fixed plate 5 is square steel plate, four sample fixed plates 5 are located the both ends of the cuboid steel block of anchor clamps 2 and lower anchor clamps 3 respectively, it is corresponding with the bolted connection hole 12 at last anchor clamps 2 and lower anchor clamps 3 both ends respectively to have a fixed orifices 17 on sample fixed plate 5, sample fixed plate 5 is placed respectively at the upper surface of 9 lower surfaces of the last strip-shaped board of cross sample and the upper surface of lower strip-shaped board 10, bolt 6 and nut 7 are respectively through last anchor clamps 2, bolted connection hole 12 and the fixed orifices 17 of sample fixed plate 5 of lower anchor clamps 3 are connected cross sample clamp tightly.
The using process of the utility model is as follows:
a. sample preparation
The upper strip-shaped plate 9 and the lower strip-shaped plate 10 are crossed into a cross shape, and the welding operation is carried out on the central parts of the upper strip-shaped plate 9 and the lower strip-shaped plate 10, so that the upper strip-shaped plate 9 and the lower strip-shaped plate 10 are connected together through a welding spot 11 to form a cross-shaped sample;
b. sample assembly
Placing an upper strip-shaped plate 9 of the cross sample between the upper clamp 2 and the sample fixing plate 5, and connecting the upper strip-shaped plate and the sample fixing plate together through a bolt 6, a washer 8 and a nut 7; according to the same operation steps, a lower strip-shaped plate 10 is placed between a lower clamp 3 and a sample fixing plate 5 and connected together through a bolt 6, a washer 8 and a nut 7;
c. testing machine assembly
The upper ends of the upper clamping rod 1 and the lower clamping rod 4 are respectively clamped on two jaws of a fatigue testing machine;
d. carrying out a loading test
Starting a fatigue testing machine, carrying out a loading test, and preloading a welding spot sample to the maximum load value of the fatigue test so as to prevent a large yield phenomenon from occurring in the dynamic loading process and further influence the testing precision; unloading the load to an average value; starting the fatigue test with a smaller amplitude; increasing the fatigue load amplitude to a predetermined target;
in the whole test process, a constant-amplitude sine wave load is applied, the load control mode is force control, the load ratio R is 0.1, and the loading frequency is 25 Hz. In this study, weld fatigue failure was defined as the appearance of visible fatigue cracks on either side of the welded steel plate. When the controller detects that the maximum deformation of the welding spot exceeds a preset value, the rigidity of the welding spot is rapidly reduced, fatigue failure occurs, and the test is stopped. All solder joint fatigue tests were performed in a room temperature environment.
One embodiment of the utility model is as follows:
a. sample preparation
An upper strip-shaped plate 9 and a lower strip-shaped plate 10 made of DC01 steel are crossed into a cross shape, and welding operation is carried out on the central parts of the upper strip-shaped plate 9 and the lower strip-shaped plate 10, so that the upper strip-shaped plate 9 and the lower strip-shaped plate 10 are connected together through a welding spot 11 to form a cross sample;
b. sample assembly
Placing an upper strip-shaped plate 9 of the cross sample between the upper clamp 2 and the sample fixing plate 5, and connecting the upper strip-shaped plate and the sample fixing plate together through a bolt 6, a nut 7 and a washer 8; according to the same operation steps, a lower strip-shaped plate 10 is placed between a lower clamp 3 and a sample fixing plate 5 and connected together through a bolt 6, a nut 7 and a washer 8;
c. testing machine assembly
The upper ends of the upper clamping rod 1 and the lower clamping rod 4 are respectively clamped on two jaws of a fatigue testing machine;
d. carrying out a loading test
Starting a fatigue testing machine, carrying out a loading test, and preloading a welding spot sample to the maximum load value of the fatigue test so as to prevent a large yield phenomenon from occurring in the dynamic loading process and further influence the testing precision; unloading the load to an average value; starting the fatigue test with a smaller amplitude; increasing the fatigue load amplitude to a predetermined target;
in the whole test process, a constant-amplitude sine wave load is applied, the load control mode is force control, the load ratio R is 0.1, and the loading frequency is 25 Hz. In this study, weld fatigue failure was defined as the appearance of visible fatigue cracks on either side of the welded steel plate. When the controller detects that the maximum deformation of the welding spot exceeds a preset value, the rigidity of the welding spot is rapidly reduced, fatigue failure occurs, and the test is stopped. All solder joint fatigue tests were performed in a room temperature environment.
Static cross tensile property of the welding spot: l ismax=8.76 KN, and the results of the different stress tests are shown in table 1, and the test results are reduced to 4KN, 3KN and 2 KN from the load of 6KN, and the number of parallel samples in each group is 3. The curve fitted with the least squares method using the limited lifetime data is shown in fig. 8; the fatigue limit of three infinite life sections of 1.5KN, 1.7KN and 1.9KN is tested by a step method and is shown in figure 9, the maximum force-life curve is shown in figure 10, and the maximum fatigue limit force is 1.75KN.
TABLE 1 fatigue test results
The fitting equation is
logL=3.69355-0.21722lgN
The formula for calculating the fatigue limit by the step method test is as follows
Wherein m is the total number of effective tests, n is the force level grade, viNumber of tests at i-th force level, LiIs the i-th order force level
Where m =8 and n = 3.
The utility model not only enables the fatigue test of the welding spot cross sample to be carried out on a common tensile testing machine, but also has reasonable design of the whole set of clamp, high processing precision and wide application range, and can be used for the welding spot test of all automobile plates and household appliance plate materials with the thickness range of 0.3-3mm and the strength level below 1500 MPa; in addition, the whole set of clamp adopts a split type mechanical structure, and has the characteristics of simple structure, high test precision, low manufacturing and using cost and the like.
Claims (4)
1. The utility model provides a cross sample fatigue test device of resistance spot welding which characterized in that: it includes anchor clamps (2), anchor clamps (3) down, go up supporting rod (1), lower supporting rod (4), bolt (6), nut (7), it is the same with the structure of anchor clamps (3) down to go up anchor clamps (2), it is the cuboid steel block respectively to go up anchor clamps (2) and lower anchor clamps (3), ascending arch in the middle of the last plane of cuboid steel block, there is perpendicular decurrent bolted connection hole (12) respectively on the cuboid steel block of protruding both ends, bellied central authorities have perpendicular decurrent supporting rod screw hole (14), it is the cylinder steel bar respectively to go up supporting rod (1) and lower supporting rod (4), it has the screw thread respectively to go up the lower part of supporting rod (1) and lower supporting rod (4), the lower part screw thread of going up supporting rod (1) and lower supporting rod (4) is connected with the supporting rod screw hole (14) of the protruding central authorities of last anchor clamps (2) and lower anchor clamps (3) respectively, the upper surface of strip shaped plate (9) on the cross sample is placed to the bottom surface of the cuboid steel block of last supporting rod shaped plate (2) The lower surface of the lower strip-shaped plate (10) of the cross sample is placed at the bottom surface of the cuboid steel block of the lower clamp (3), connecting holes (16) are respectively formed in two ends of the upper strip-shaped plate (9) and the lower strip-shaped plate (10) of the cross sample and correspond to bolt connecting holes (12) at two ends of the upper clamp (2) and the lower clamp (3), bolts (6) and nuts (7) are respectively connected with the connecting holes (16) of the bolt connecting holes (12) of the lower clamp (3) and the cross sample through the upper clamp (2), and the upper ends of the upper clamping rod (1) and the lower clamping rod (4) are respectively clamped on two jaws of the fatigue testing machine.
2. The resistance spot welding cross-shaped sample fatigue test apparatus according to claim 1, characterized in that: it is also sample fixed plate (5), sample fixed plate (5) are square steel plate, four sample fixed plates (5) are located the both ends of the cuboid steel block of anchor clamps (2) and lower anchor clamps (3) respectively, it is corresponding with bolt connection hole (12) at last anchor clamps (2) and lower anchor clamps (3) both ends respectively to have fixed orifices (17) on sample fixed plate (5), place the lower surface at last strip-shaped plate (9) of cross sample and the upper surface of lower strip-shaped plate (10) of cross sample respectively in sample fixed plate (5), bolt (6) and nut (7) are respectively through last anchor clamps (2), bolt connection hole (12) and the fixed orifices (17) of sample fixed plate (5) of lower anchor clamps (3) are connected the cross sample clamp tightly.
3. The resistance spot welding cross-shaped sample fatigue test apparatus according to claim 1, characterized in that: a circular groove (15) is formed in the center of the bottom surface of the rectangular steel block of the upper clamp (2) and the lower clamp (3), and the circular groove (15) is opposite to a welding point (11) in the center of the cross-shaped test sample.
4. The resistance spot welding cross-shaped sample fatigue test apparatus according to claim 1, characterized in that: the lower bottom surface of the rectangular steel block of the upper clamp (2) and the lower clamp (3) is respectively provided with a tooth form (13), and the tooth form (13) of the lower bottom surface of the upper clamp (2) and the lower clamp (3) is respectively opposite to the upper surface of the upper strip-shaped plate (9) of the cross sample and the lower surface of the lower strip-shaped plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122018555.7U CN216309608U (en) | 2021-08-25 | 2021-08-25 | Resistance spot welding cross sample fatigue test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122018555.7U CN216309608U (en) | 2021-08-25 | 2021-08-25 | Resistance spot welding cross sample fatigue test device |
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| Publication Number | Publication Date |
|---|---|
| CN216309608U true CN216309608U (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122018555.7U Active CN216309608U (en) | 2021-08-25 | 2021-08-25 | Resistance spot welding cross sample fatigue test device |
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| CN (1) | CN216309608U (en) |
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2021
- 2021-08-25 CN CN202122018555.7U patent/CN216309608U/en active Active
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