JPS63210747A - Ceramic sample holding means for durability testing jig - Google Patents

Abstract

PURPOSE:To tightly hold a sample at a specific position by forming a two- pronged fastening part atop of the reduced-diameter projection part of a vibration horn, and holding a sample between the couple of prongs piece by using a clamping bolt and a pressure bolt. CONSTITUTION:The clamping bolt 16 is engaged threadably with a prong piece 13 of the two-pronged fastening part 12 formed at the diameter-reduced projection part 11. Further, a semicircular fitting groove 17 is formed in the internal surface of the prong piece 13, the fitting groove 18 of the ceramic sample (p) is set opposite the groove 17, and an interlocking pin 19 is interposed between them. Then the pressure bolt 21 which has a slanting surface atop is engaged threadably with a screw hole 20 at the center part of the prong piece 13. Further, a guide piece 23 which has an extrusion guide surface 22 formed an upper and a lower slanting surface is arranged for the sample (p). Then the sample (p) is positioned with the pin 19, the bolt 16 is clamped weakly, and the bolt 21 is tightened up to press its tip slanting surface against the guide surface 22, thereby pressing the sample (p) forward through the operation of the surface 22. Then the bolt 16 is tightened to position and hold the sample (p) tightly and uniformly.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a method for holding a ceramic sample in a jig used to apply vibration to a ceramic sample and test its durability leading to fatigue failure. Concerning means.

<Prior art> As shown in Fig. 5, a jig a for durability testing of ceramics is used.
In this example, a vibrating horn b is composed of a large-diameter base end C whose back surface is the installation surface, and a diameter-reducing protrusion e that projects forward from a fixed collar d of the base end C. A vibrator f is fixed, and a ceramic sample p is fixed to the tip of the diameter-reducing protrusion.

In this device, the total lengths of the ultrasonic vibrator f and the vibrating horn b are set to be fixed with respect to the wavelength input of the applied voltage, and the fixed collar d is positioned in the middle of the vibrating horn b. Roughly, the length of the ceramic sample fixed to the tip of the diameter-reducing protrusion e is also assumed to be λ, and the overall length of the jig a is expressed by The maximum stress is applied at the position where the flange insertion Xn is 10%, which is the central node position of the ceramic sample P, and fatigue occurs there and breaks.

<Problems to be Solved by the Invention> Incidentally, in the conventional configuration described above, the ceramic sample p was fixed to the tip of the diameter-reducing protrusion e of the vibrating horn b using an instant adhesive or the like.

Therefore, when a large vibration is applied to this ceramic sample p, the maximum vibration amplitude is generated at this mounting position, and heat is generated.
Destruction could occur due to the difference in thermal expansion between the vibrating horn and the ceramic sample p.

The present invention relates to a ceramic sample holding means that aims to improve the above-mentioned conventional drawbacks.

Means for Solving the Problems> The present invention forms a bifurcated engagement part into which the ceramic sample P is inserted at the tip of the diameter-reducing protrusion of the vibrating horn, and holds the ceramic sample P between the pair of prongs. At the same time, a compression bolt is screwed onto the branch end side of the bifurcated joint, and the pressure contact force of the tip of the compression bolt is applied to the rear end of the ceramic sample p by pushing it forward. forming an extrusion guide surface to
Furthermore, a linking pin is fitted into a fitting groove formed in an opposing manner on the inner surface of the crotch piece and the upper and lower surfaces of the ceramic sample p.

Action〉 Insert the ceramic sample fI4p into the bifurcated occlusion,
A linking pin is inserted into a fitting groove formed opposite to the inner surface of the crotch piece and the ceramic sample, and the clamping bolt is tightened. Furthermore, by tightening the suppression bolt, its tip comes into contact with the extrusion guide surface, and the ceramic sample is pressed forward by the converting action of the guide surface. Therefore, even if there is play in the fitting groove, the one front and back position can be maintained by the force from the rear.

Thus, the ceramic sample p is firmly held in a predetermined position, and vibrations from the vibrating horn are efficiently transmitted to the ceramic sample p.

<Example> FIG. 1 shows an embodiment of the jig X of the present invention.

Here, 1 is a vibrating horn that is attached to a support portion y while holding a fixed collar 2, and a large diameter base end 3 of the vibrating horn 1.
An ultrasonic transducer 5 is fixed to an installation surface 4 on the rear surface of the . This ultrasonic transducer 5 consists of a pair of annular piezoelectric elements 7.7 and an annular terminal plate 8 disposed between the elements and on the upper and lower surfaces of the elements. .

9b, is implanted on the skirting surface 4 through bolts 1O, and is fastened and fixed with one weight. The vibrating horn l has a small diameter reducing protrusion 11 protruding in front of the fixed collar 2, and the 11i
! The distal end surface of the radial protrusion 11 has a function of expanding the amplitude.

The length relationship of each of the above-mentioned components is such that the entire length of the ultrasonic transducer 5 is set as a local, the vibrating horn l is also set as a flange λ, and the position of the fixed flange 2 is set as a distance from the hem surface 4 of the base end 3. There is.

Furthermore, the tip of the diameter-reducing protrusion 11 exceeds λ from the rear surface of the ultrasonic transducer 5, and the maximum stress is applied (1+3
/4) The position does not exceed the position of λ.

This means that the ceramic sample p is at the node position (1+
3A) Maximum stress is applied at the λ position, where fatigue occurs and breakage occurs. Therefore, since it is sufficient that the sample p is placed at this position, the tip of the diameter-reducing protrusion 11 is extended within a range that does not exceed this position, thereby reducing the usable length of the ceramic sample p. .

Next, the second and third ceramic sample holding means according to the present invention are
The diagram will be explained.

A bifurcated bite portion 12 is formed at the tip of the diameter-reducing protrusion 11 . The crotch pieces 13, 13 of the latching part 12 have a wide plate shape as shown in FIG.
For example, on the left side, the upper crotch piece 13 has a through hole 14,
The lower crotch piece 13 is formed with opposing screw holes 15, and on the right side, the upper crotch piece 13 is provided with a screw hole 15, and the lower crotch piece 13 is formed with a through hole 14 in an opposing manner. The clamping bolts 16 and 16 are screwed in from above on the left side and from below on the right side, respectively.

In addition, semicircular fitting grooves 17, 17 in the width direction are formed on the inner surface of the crotch pieces 13.13, and fitting grooves 18, 18, which have the same shape as the fitting grooves 17, 17, are formed in the ceramic sample P in advance. 1
8 are formed on the upper and lower surfaces, and the fitting grooves 17, 17 and the fitting grooves 18, 18 are opposed to each other, and the linking pin 1 is formed between them.
9.19 will be interposed.

Next, screw holes 20, 20 are formed in the crotch pieces 13, 13 at the branch end side of the bifurcated latching part 12, at the center thereof,
A pressing hole 21.21 having an inclined surface at its tip is screwed into the screw hole 20.20.

Furthermore, at the rear end of the ceramic sample p.

A guide piece 23 is disposed on the rear surface and has an extrusion guide surface 22 formed with an upper and lower sloped surface that abuts the lower end of the pressing pole 21.21.

With this configuration, the ceramic sample p is positioned using the linking pin 19.19, the clamping bolt 16.16 is slightly tightened, and the suppressing bolt 21.21 is further tightened to extrude it with the inclined surface at its tip. The inclined surface of the guide surface 22 is strongly pressed from above and below, and the action of the guide surface 22 generates a force in the extrusion direction to press the ceramic sample p forward. As a result, the fitting grooves 17, 17. Even if there is play in the fitting grooves 18, 18, the front and back positions can be aligned evenly. After this, the clamping pins 16 and 16 are further tightened, so that the ceramic sample p is firmly and evenly positioned and held.

After the above installation, when an alternating voltage of wavelength λ is applied to the terminal plate 8.8, the piezoelectric element 4 and the vibrating horn 1 vibrate together. Then, the position of the fixed collar 2 and the ultrasonic vibrator 5
Portion 0 of the ceramic sample p at a position (1+%) in from the rear surface becomes a node position, and the maximum stress is applied here. Therefore, the ceramic sample p is fatigued at the portion 0,
If the fire resistance is exceeded, it will break and the material properties of the ceramic sample p will be detected.

In the embodiment described above, the guide piece 23 is provided at the rear end of the ceramic sample p, and the extrusion guide surface 22 is arranged therein, but the extrusion guide surface 22 may be formed directly on the ceramic sample p.

Further, FIG. 4 shows a crotch piece 31 of the bifurcated latching part 30 so as to be applicable to holding a ceramic sample p formed in a cylindrical shape.
, 31 are arcuate, and in this case, a fitting groove 32.32 formed on the inner side of the crotch piece 31.31;
The fitting groove 33 formed around the entire circumference of the ceramic sample p has an arc shape along its inner surface, and the linking pin 34 is externally fitted into the fitting groove 33 of the ceramic sample p.

Effect> As described above, the present invention positions the ceramic sample P with the linking bin, tightens the pressing bolt, and presses the ceramic sample P by the guiding action of the extrusion guide surface.
Since the ceramic sample p was tightly held in the front and back direction and further clamped by tightening the clamping bolt, the ceramic sample p
can be firmly held in place without wobbling.
There are excellent effects such as being able to prevent the ceramic sample p from breaking at the joint and efficiently transmitting the vibration to the ceramic sample p side.

[Brief explanation of the drawing]

FIG. 1 is a side view of a jig X according to an embodiment of the present invention,
FIG. 2 is an enlarged vertical sectional side view of the main part, FIG. 3 is a partially cutaway right side view, and FIG. 4 is a right side view of a modified example, showing the relationship of lengths at the bottom. FIG. 5 shows a jig a having a conventional structure, and the relationship between swing width and stress is also shown along the axis. X; Jig p; Ceramic sample 1; Vibration horn 2;
Fixed collar 3; Base end 5; Ultrasonic vibrator 11; Diameter reducing protrusion 12; Bifurcated occlusal part 13.13; Crotch piece 16,1
6. Squeezing bolt 17.17; Fitting groove 18, 18; Fitting groove 19.19; Linking pin 21, 21. Pressing bolt 22; Extrusion guide surface 23; Guide piece 30; Bifurcated engagement portion 31, 31; Crotch piece 32, 32; Fitting groove 33; Fitting groove 34: Connecting pin Applicant: NGK Spark Plug Co., Ltd. -2P Agent: Patent Attorney Kita Matsuura, Figure 1, Figure 5 (21?)

Claims (1)

[Scope of Claims] A vibrating horn has a diameter-reducing protrusion protruding forward from a large-diameter proximal end having a fixed flange, and an ultrasonic vibrator is fixed to the back surface of the vibrating horn, the tip of the diameter-reducing protrusion. A ceramic sample is attached to the jig, which is used for a durability test.A bifurcated engagement part into which the ceramic sample is inserted is formed at the tip of the diameter-reducing protrusion, and the ceramic sample is attached to the pair of prongs. A clamping bolt is screwed into the clamping bolt, and a pressing bolt is screwed onto the branch end side of the bifurcated joint, and the pressing force of the tip of the pressing bolt is applied to the rear end of the ceramic sample to push it forward. an extrusion guide surface is formed on the inner surface of the crotch piece and the upper and lower surfaces of the ceramic sample are formed to face each other.
A ceramic sample holding means for a durability test jig characterized by having a linking pin inserted therein.