JPS6035619B2 - Inertial vibration type bonding force measuring machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bonding force measuring device.

As a bonding force measuring device of this type, the Schellhommer type shown in FIG. 1 is widely known.

This is a test plate D, which is fastened to a floating table 42, which is movable only in the left and right directions, with bolts 45 and nuts 46, sandwiching a nylon plate 44 to prevent seizure.
One plate D of B is fixed, and the other plate E is attached to the vibrator 43.
The performance and features of the screw itself can be ascertained by vibrating the screw in the horizontal direction with the plate E using the vibrator 43 and measuring the loosening torque with a torque wrench or the like after the vibration. In this case, as the vibration cycle of the vibrator 43 is increased to increase the vibration power, the loosening torque gradually decreases and becomes negative. The frictional coupling force generated by tightening the bolts 45 and nuts 46 between the plates D and E is determined from the vibration power when the loosening torque becomes negative. However, with such devices, the work of measuring the loosening torque is extremely complicated and inefficient, and the measured values of the loosening torque vary widely, making it difficult to accurately and stably obtain the frictional bonding force. Additionally, there was a drawback that the bonding force of bonding methods other than screws could not be measured.

The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional devices and to provide a device for measuring frictional bonding force in an extremely accurate and efficient manner.

This invention will be explained with reference to the embodiment shown in FIG.

FIG. 2 shows a state in which the test plates A and B and the test screw shaft C are respectively attached to the bonding force measuring device 1.

This measuring device 1 has a vibration table 6 that is vibrated along the vibration direction on top of a vibrator 3 that vibrates in the direction of the arrow, and has bolts 4,
It is installed by a frame 5. This vibration table 6 has a protruding pupil portion 7 which protrudes from its upper surface and into which the first test piece A is inserted, and a vertical hole 9 which passes through the pupil portion 7 and into which the test screw shaft C is inserted. A floating table 11 having an opening 10 larger than the movement range of the calendar section 7 is inserted into the sekiguchi section 101 from above the calendar section 7 so that the vibration table 6 can move freely only in the direction of vibration. In addition, the slide bearing 1 is positioned so that the top surface of the floating table 11 is located above the top surface of the war calendar section 7.
It is attached via 2. Vertical hole 9 of the vibration table 6
From below, the strain gauge retainer 14 slides into the sliding bearing 15,
Through the bolt 16.

This retainer 14 is composed of a flange 17 and a main body 18, and the main body 18 is composed of a cylindrical part 19 and a lid part 20 at the upper end. A strain gauge 21 connected to a strain meter (not shown) is attached to the outer wall of the cylindrical portion 19, and inside the cylindrical portion 19, a strain gauge 21 is attached to the flange 17 so as to be movable up and down via a retaining ring 22, and to be movable up and down via a pin 23. A pivotably mounted strut 24 is inserted. An annular projecting portion 25 is provided at the upper end of the support column 24 and extends laterally, and a nut 26 is fixed to the upper surface of the projecting portion 25 . A compression spring 27 surrounding the support column 24 is interposed between the lower surface of the projecting portion 25 and the flange 17, and this spring 27 biases the nut 26 against the lower surface of the lid portion 20 of the main body 18. be. The test plate A of the screw shaft clamping body 2 is attached to the upper surface of the bush layer part 7 of the vibration table 6 so that its through hole and the center hole 8 are aligned, and the test plate A is fixed with a pin 28 so as not to move. Test plate B, which is in contact with the test plate B, is attached to the floating table 11 with pins 29 so that it does not move, aligning its through hole with the through hole of the test plate A, and attaching the test plate B to the floating table 11 using a support punch 30. Pressure is applied with a pressure member 31 installed through the pressure member 31 .

Then, the screw shaft C is inserted into the through hole of the test plate B and the vertical hole 10 from above the test plate B, and the screw shaft C is screwed into the nut 26 fixed to the support column 24. At this time, the tightening force of the screw shaft C is detected via a strain gauge 21 and a strain recorder. Further, in FIG. 2, 32 is an accelerometer installed on the floating table 11 to measure its acceleration, and 33 is a displacement meter that detects displacement between the vibration table 6 and the floating table 11. and is installed on the vibration table 6.

The accelerometer 32 and the displacement meter 33 are connected to a recorder (not shown), so that the acceleration of the floating table 11 and the displacement between the vibration table 6 and the floating table 11 are simultaneously recorded by this recorder. It's getting old. In the above-mentioned device, when the ultra-vibration machine 3 is operated to vibrate the vibration table 6, the floating table 1, which is connected to the vibration table 6 via the screw shaft C and both test plates A and B,
1 vibrates together with the vibration table 6, and an inertial force Pu is applied to the floating table 11.
occurs, and this acts along the contact surfaces of both test plates A and B.

As the vibration cycle of the vibrator 3 is increased to increase the vibration power, the inertia force Pu of the floating table 11 gradually increases, and the floating table 11, which was vibrating together with the vibrating table 6, becomes the same as the vibrating table 6. During this period, a displacement occurs and begins to vibrate, and the displacement meter 33 detects that this displacement has occurred. If the inertial force at that time is P and the acceleration of the floating platform 11 is Qo, then the following relational expression {1}'2}
holds true. Puo=P
...'1'PM=mQo
...■Here m...Floating platform 11 (test plate B
) Mass Qo...Acceleration of floating platform 11 {1 female'
From the formula, the following relational formula {3} holds true: P=mQ.

``-[31 Since the mass m of the floating platform 11 can be measured separately, and the acceleration Qo can be obtained from the accelerometer 32, the frictional bonding force P generated between the two test slopes can be found from equation {31 by screw ball C. The following relational expression {41 holds true between the binding force Ff of the screw shaft C and the frictional bonding force P generated between the test plates A and B thereby.

P Ni Buddha・Ff…■Here Buddha・
... Static friction coefficient between both test slopes Since the vertical force Ff of the screw shaft C can be detected separately via the strain gauge 21, etc., the static friction coefficient peak can be found from the equation {3'■.

In the above, it is explained that the frictional bonding force of both test plates A and B are fastened together by the screw shaft C, but it goes without saying that the frictional bonding force of a rivet joint can also be determined. do not have.

Since the present invention is configured as described above, the frictional coupling force generated by the tightening force of the screw ball between the two fastened objects of the screw shaft assembly can be measured for the loosening torque as in the conventional Shelohonmer type measuring machine. It is calculated from the inertial force when a displacement occurs between the two fastened objects, which is different in principle from this method, and is therefore very accurate and efficient in measuring frictional bonding force compared to conventional measuring instruments. In addition to being able to measure, the connection conditions of the screw shaft assembly can be
It has excellent effects such as being able to set it to the state in which it will actually be used, making it extremely easy to determine the frictional bonding force in the screw shaft assembly that is actually used, and the structure being extremely simple and easy to handle. .

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a conventional bonding force measuring device, and FIG. 2 is a longitudinally sectional perspective view of an embodiment of this invention. 1... Coupling force measuring machine, 3... Vibrator,
5... Frame, 6... Vibration table, 7...
...Protruding layer part, 9...Vertical hole, 10...
...Sekiguchi section, 11...Floating platform, 12...
Slide bearing, 14...Strain gauge retainer, 21.
...Strength gauge, 24...Strut, 2
5... Annular overhang, 26... Nut, 31
...... Pressure member, 32... Accelerometer, 33... Displacement meter, A, B... Test plate, C... Test screw shaft. Heron drawing 2 drawings

Claims (1)

[Claims] 1. A vibration table having a first mounting part provided on the top of the vibration exciter so as to be vibrated in the vibration direction, and on which the first test piece is placed parallel to the vibration direction. A second test piece is attached to the vibration table so as to be movable only in the direction of vibration, and a second test piece is placed in contact with the first test piece placed on the first placement part. a floating table having a second mounting part that is shaped like a floating table, and a first test piece placed on the first mounting part and a second test piece placed on the second mounting part, which are provided on the vibration table. a tightening means adapted to tighten the piece in a direction perpendicular to the vibration direction, a tightening force detection means adapted to detect the tightening force, and an acceleration detection provided on the floating table. 1. An inertial vibration type bonding force measuring device, comprising: means for detecting relative displacement between a floating table and a vibration table.