JP4089034B2 - Torsion testing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a torsion test machine for evaluating the torsional stress of the solder joint in mounting substrate caused when implementing the connector by solder bonding to the substrate is found using the mounting board of an electronic device, the reliability evaluation device It is about.
[0002]
[Prior art]
As a method for evaluating the torsional stress applied on the mounting board to the connector used for connecting between the boards, the angle deviation between the boards is measured, and this angle deviation is represented by the torsional stress applied to the connector. It is possible.
[0003]
As a method for measuring the torsional torque of a connector, a connector-shaped bit is formed at the tip of a torque wrench or torque driver, the bit is inserted into, for example, the female side of the connector, and the bit is inserted with the torque wrench or torque driver. It is conceivable to measure the torque after the destruction of the solder joint between the female connector and the substrate by rotating.
[0004]
FIG. 7 is a side view schematically showing a conventional torsion tester. This torsion tester can measure the rotation angle and torsion torque of the connector simultaneously.
[0005]
As shown in FIG. 7, the torsion tester has a torque driver 105, and a connector-shaped jig bit 109 is formed on the torque driver 105 via a shaft 107. An extension scale needle 111 for measuring the rotation angle is attached to the jig bit 109.
[0006]
Then, the female connector 103 soldered onto the substrate 101 is disposed below the jig bit 109, the jig bit 109 is moved downward, and the jig bit 109 is inserted into the connector 103 and combined. . Next, a torque driver 105 applies a rotational force to the jig bit 109 via the shaft 107 to apply a torsional stress (torsional torque) to the solder joint between the connector 103 and the substrate 101. Thereafter, the torsion angle when the solder joint is destroyed by this torsional stress is read by the extension scale needle 111, and the torque at which the solder joint is destroyed is measured.
[0007]
In this torsion tester, the scale of the goniometer pointed by the scale needle 111 has only a main scale and no sub-scale. For this reason, the measurement accuracy is poor at about 1 degree.
[0008]
[Problems to be solved by the invention]
However, the conventional torsion tester has the following problems when measuring the force applied to the solder joint and the twist angle.
(1) Although the torque at which the solder joint has been destroyed can be measured, the torsion angle at that time is no longer loaded after the destruction, so the scale needle 111 is likely to go too far, and the accurate angle should be measured. It becomes difficult.
[0009]
(2) Since the conventional torsion tester does not have a means for observing the fracture condition of the solder joint, only the torque value and the torsion angle at the time of fracture can be measured.
(3) In the conventional torsion testing machine, no means for holding a predetermined time condition like multiplied by any torsional torque to the solder joints. For this reason, it is not possible to measure a torsion angle after an arbitrary torsion torque is applied for a predetermined time.
[0010]
The present invention has been made in view of the circumstances described above, and its object is torsion testing machine torsion torque or twist angle when the solder joint between the substrate and the connector is broken can be measured well accuracy Is to provide.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the torsion tester according to the present invention is a solder in a state in which a male connector joined to the first board by solder and a female connector joined to the second board by solder are combined. A torsion tester that measures the torsional force when a torsional force is applied to the joint and the rotation angle of the soldered joint, and measures the conduction resistance in a state where the male connector and the female connector are coupled. and the minute resistance measuring means, the a twisting force supplying means applying a torsional force to the solder joint, and a torque sensor for detecting the torsional force, and a goniometer which measures the angle of rotation, by the torsional force supply means While applying a torsional force to the solder joint, the microresistance measuring means measures the change in the conduction resistance from the beginning to the end of the solder joint fracture. By the torque sensor and the angle meter is obtained by allowing observation of the fracture condition of the solder joint.
[0012]
According to the present invention, when a torsional force is applied to the solder joint portion, the solder joint portion is cracked, and changes slightly in the direction in which the conduction resistance of the solder joint portion increases. By reading it with a minute resistance measuring means, it is possible to measure the time of destruction of the solder joint. Thereby, the exact angle or torsional force when the solder joint is broken can be measured.
[0014]
Preferably, the apparatus further includes holding means for holding the substrate and the connector in a state where a predetermined twisting force or a predetermined rotation angle is applied to the solder joint. Thereby, it can put into a thermal shock test tank etc. with the predetermined torsion angle added to the soldering joint, and can perform an acceleration test. And the creep destruction time of the solder joint part by torsional force can be measured.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below are preferred examples of the present invention, and thus various technically preferred limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of that, it is not restricted to these forms.
[0016]
Fig.1 (a) is a top view which shows the mechanism part of the torsion tester by embodiment of this invention, FIG.1 (b) is a side view of the torsion tester shown to Fig.1 (a). FIG. 2 is an enlarged schematic view of the mechanical portion of the torsion tester shown in FIG. 1 and a recorder that records torsion torque and minute resistance. 3A is a diagram showing a part of the upper surface of the substrate 13b shown in FIG. 2, and FIG. 3B is a diagram showing a part of the upper surface of the substrate 13a shown in FIG. FIG. 4 is a diagram schematically showing the connection relationship between the conduction resistance of the solder joint between the connector and the substrate and the micro-resistance meter.
[0017]
As shown in FIG. 1, this torsion tester has a vertically movable portion 120 that moves up and down, and a vertically movable portion 121 that moves back and forth is connected to the vertically movable portion 120. The arm 5 and the handle 50 are connected to the front / rear movable portion 121. The arm 5 is configured to be rotatable about a rotation center described later. The handle 50 is configured such that the arm 5 is pushed in the rotational direction by turning the handle 50. An upper unit 100 is connected to the arm 5 continuously.
[0018]
As shown in FIG. 2, the upper unit 100 includes a torque sensor 4, a rotation angle meter 3 provided with a vernier, a bearing 2, a shaft 14, fixing plates 18 a and 18 b, fixing shafts 6 a and 6 b, and an upper plate 7. It is configured. The rotation centers of the upper plate 7, the shaft 14, the rotation angle meter 3 and the torque sensor 4 are arranged to coincide with the rotation center of the connector 1a. The goniometer 3 is arranged concentrically around the rotation center of the connector.
[0019]
A shaft 14 is connected to the arm 5. The shaft 14 supports the upper plate 7 and is given a torsion torque by the arm 5. The shaft 14 is held by the bearing 2. The rotation angle meter 3 is arranged concentrically with the shaft 14. The torque sensor 4 is directly connected to the shaft 14. The torque sensor 4 is configured such that the torsion torque detected thereby is input to the recorder 12 via the voltage amplifier 16 via the signal line 17.
[0020]
The upper plate 7 fixes the substrate 13a to the lower surface thereof. A lower plate 8 is disposed below the upper plate 7, and the lower plate 8 is fixed to the base 15 with screws 19. The lower plate 8 fixes the substrate 13b on the upper surface. Further, the rotation centers of the lower plate 8 and the connector 1 b are arranged to coincide with the rotation center of the upper unit 100.
[0021]
The recorder 12 has a micro-resistance meter 11 having a distortion amplifier. The micro-resistance meter 11 is electrically connected to the solder joints between the connectors 1a and 1b and the substrates 13a and 13b via the wiring 9 and the variable resistor 31. Connected. That is, the board 13b, the female connector 1b, the male connector 1a, the board 13a, and the wiring 9 are connected in series. Therefore, the conduction resistance of the solder joint is measured by the micro-resistance meter 11 and input to the recorder 12 via the micro-resistance meter 11.
[0022]
Next, a method for performing a torsion test of the connector by applying a torsion torque to the connector with the torsion tester and measuring the torsion torque, torsion angle, and minute resistance will be described.
[0023]
First, as shown in FIG. 2, a substrate 13a having a male connector 1a bonded to the surface by solder is prepared, and a substrate 13b having a female connector 1b bonded to the surface by solder is prepared.
[0024]
That is, as shown in FIG. 3A, the check land 20 is formed on the upper surface of the substrate 13b, and the check land 20 is electrically connected to the lands 22a and 22j through the wiring pattern. The lands 22b to 22h are connected by the routing pattern 21. A female connector 1b is soldered to the lands 22a to 22j on the substrate 13b shown in FIG.
[0025]
On the other hand, as shown in FIG. 3B, lands 23 a to 23 j are formed on the upper surface of the substrate 13 a, and the lands 23 a to 23 j are connected by a routing pattern 24. A male connector 1a is soldered to lands 23a to 23j on the substrate 13a shown in FIG.
[0026]
Next, the vertically movable portion 120 shown in FIG. 1 is raised along the guide to fix the upper unit 100 at the top, the substrate 13a is fixed to the upper plate 7 with screws or the like, and the substrate 13b is fixed to the lower plate 8. Secure with screws. Then, the wiring 9 is connected to the check land 20 on the substrate 13b shown in FIG. Thereafter, the upper unit 100 is lowered by lowering the vertically movable portion 120, and the male connector 1a and the female connector 1b are coupled. When the connector 1a and the connector 1b are combined in this way, all of the connectors 1a and 1b are routed from the lands 22a to 22j and 23a to 23j through the check lands 20 shown in FIG. Contacts are routed in series.
[0027]
Here, the relationship between the conduction resistance and the minute resistance meter shown in FIG. 4 will be described. The resistor 30 indicates all the conduction resistances such as the wiring resistances of the substrates 13a and 13b, the conduction resistance of the wiring 9, and the conduction resistances of the connectors 1a and 1b. The resistor 31 is a variable resistor for adjusting the microresistance meter 11 to 0 before applying a twisting force to the solder joint.
[0028]
Thereafter, the handle 50 is rotated in a state where the male connector 1a and the female connector 1b are coupled. As a result, the arm 5 is pushed as shown in FIG. 1A, and as a result, a torsional force is transmitted to the solder joint via the shaft 14 shown in FIG. As long as there is a reaction force at the solder joint, the force is transmitted to the torque sensor 4 through the shaft 14. As the shaft 14 rotates, the needle 70 shown in FIG. 1B fixed to the shaft 14 turns around the rotation angle meter 3. The rotation angle of the solder joint is read by aligning the zero scale of the rotation angle meter 3 with the tip of the needle 70. At that time, it is possible to read up to 20 minutes by adjusting the vernier. Therefore, the torsion torque and the breaking state of the connector can be defined by the angle. As a result, the solder joint state between the connectors directly attached to the substrate can be predicted by the attachment state of the substrate.
[0029]
When cracks enter the solder joint due to the torsional force, the resistance 30 shown in FIG. 4 slightly changes in the increasing direction. The minute resistance meter 11 reads it on the principle that the resistance 33 is balanced, and the change of the conduction resistance 30 is transmitted to the recorder 12 and recorded. Thereby, it is possible to measure from the beginning to the end of the destruction of the solder joint. Thereby, the exact angle when the solder joint is broken can be measured. Moreover, it is not only possible to measure only the torque value and the torsion angle at the time of breakage, and it is possible to observe the breakage state of the solder joint.
[0030]
Next, a method for holding the connector twisted state with a predetermined twisting torque or twisting angle will be described.
[0031]
The upper movable unit 120 shown in FIG. 1B is raised along the guide to fix the upper unit 100 on the upper side, the substrate 13a is fixed to the upper plate 7 with screws, and the substrate 13b is fixed to the lower plate 8. Secure with screws. Thereafter, the upper unit 100 is lowered by lowering the vertically movable portion 120, and the male connector 1a and the female connector 1b are coupled. When the handle 50 is rotated in this state, a torsional force is transmitted to the solder joint. When this reaches a predetermined torque value, the fixing plates 18a and 18b are inserted into the fixing shafts 6a and 6b shown in FIG. 2, and the fixing plates 18a and 18b are fixed to the fixing shafts 6a and 6b with screws. . Next, if the fixing plates 18a and 18b are fixed to the upper plate 7, the state in which a predetermined torsion torque is applied to the solder joint is maintained for a predetermined time by fixing the torsion angle of the upper plate 7 with respect to the lower plate 8. can do. Thereby, the torsion angle etc. after applying arbitrary torsional torque for a predetermined time can be measured.
[0032]
Here, if the upper plate 7 fixed to the shaft 14 is removed, and the screw 19 fixing the lower plate 8 is removed, the male connector 1a and the female connector 1b are combined vertically to give torsion torque. The torsional test jig 60 shown in FIG. 5 held in the held state can be taken out from the torsion tester. Thus, with the upper plate 7 and the lower plate 8 being combined, a life test can be performed by putting the solder joint in a predetermined torsion torque and placing it in another test apparatus, for example, a thermal shock test tank. It can be carried out. In other words, a large number of sample tests can be performed, and the lifetime of the solder joint portion of the connector to which the twist is applied can be predicted. FIG. 5 is a cross-sectional view showing a torsion test jig taken out from the tester in a state in which the connector is twisted with a predetermined torsion torque or torsion angle in the torsion tester shown in FIG.
[0033]
When the handle 50 is turned to twist the arm 5 to a predetermined angle, the needle 70 fixed to the shaft 14 turns around the rotation angle meter 3 as the shaft 14 rotates. Then, when the needle 70 points to a predetermined angle, if the fixing plates 18a and 18b are fixed to the fixing shafts 6a and 6b and the upper plate 7 with screws, a torsion torque is applied to the solder joint at a predetermined angle. The state can be maintained.
[0034]
FIG. 6 is a cross-sectional view showing an example of an angle meter using an encoder, which is a modification of the torsion tester shown in FIG. The rotation angle meter 3 can also be achieved by a method in which a timing pulley 40 is attached to the shaft 14 shown in FIG.
[0035]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a torsion testing machine capable of accurately measuring torsion torque or torsion angle when a solder joint between a substrate and a connector is broken.
[Brief description of the drawings]
FIG. 1 (a) is a top view showing a mechanical part of a torsion tester according to an embodiment of the present invention, and FIG. 1 (b) is a side view of the torsion tester shown in FIG. 1 (a). FIG.
FIG. 2 is an enlarged schematic view of a mechanical portion of the torsion tester shown in FIG. 1 and a recorder for recording torsion torque and minute resistance.
3A is a diagram showing a part of the top surface of the substrate 13b shown in FIG. 2, and FIG. 3B is a diagram showing a part of the top surface of the substrate 13a shown in FIG. is there.
FIG. 4 is a diagram schematically showing a connection relationship between a conduction resistance of a solder joint portion between a connector and a substrate and a micro-resistance meter.
5 is a cross-sectional view showing a torsion test jig taken out of the torsion tester shown in FIG. 1 in a state where the connector is twisted with a predetermined torsion torque or torsion angle. FIG.
6 is a cross-sectional view showing a modification of the torsion tester shown in FIG. 1 and an example of an angle meter using an encoder.
FIG. 7 is a side view schematically showing a conventional torsion tester.
[Explanation of symbols]
1a ... male side connector, 1b ... female side connector, 2 ... bearing,
3 ... rotation angle meter, 4 ... torque sensor, 5 ... arm,
6a, 6b ... fixing shaft, 7 ... upper plate, 8 ... lower plate, 9 ... wiring,
DESCRIPTION OF SYMBOLS 11 ... Micro-resistance meter, 12 ... Recorder, 13a, 13b ... Board | substrate, 14 ... Shaft, 15 ... Base, 16 ... Voltage amplifier, 17 ... Signal line,
18a, 18b ... fixing plate, 19 ... screw, 20 ... check land,
21 ... Routing pattern, 22a-22j, 23a-23j ... Land,
24 ... Routing pattern, 30 ... Conduction resistance, 31 ... Resistance, 33 ... Resistance,
40 timing pulley, 41 ... encoder, 50 ... handle,
60 ... Test jig, 70 ... Needle, 100 ... Upper unit, 105 ... Torque driver, 107 ... Shaft, 109 ... Jig bit, 111 ... Extension scale needle,
120: Up and down movable part, 121 ... Front and rear movable part

Claims (2)

The torsional force when the torsional force is applied to the solder joint in a state in which the male connector joined to the first substrate by solder and the female connector joined to the second substrate by solder are combined with the solder A torsion tester that measures the rotation angle of a joint,
A minute resistance measuring means for measuring a conduction resistance in a state where the male connector and the female connector are coupled;
A twisting force supply means for applying a twisting force to the solder joint;
A torque sensor for detecting the torsional force;
An angle meter for measuring the rotation angle ,
While applying a twisting force to the solder joint by the torsion force supply means, the change in the conduction resistance is measured from the beginning to the end of the destruction of the solder joint by the minute resistance measurement means, and the torque sensor and the angle A torsion tester characterized in that the destruction state of the solder joint can be observed by a meter . The torsion tester according to claim 1,
A torsion test comprising holding means for holding the first and second substrates and the male and female connectors in a state where a predetermined twisting force or a predetermined rotation angle is applied to the solder joint. Machine.

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