JP6071689B2 - Bending strength test equipment - Google Patents

Description

  The present invention relates to a bending strength test apparatus. The present invention relates to a bending strength test apparatus capable of performing a bending strength test with high accuracy and capable of performing a bending strength test even on a test piece having a low bending strength.

  Conventionally, as a method for testing the bending strength of ceramics and the like, a three-point bending strength test method and a four-point bending strength test method shown in Japanese Industrial Standard JIS R1601 are known. Among these, as a jig used for the four-point bending strength test method, for example, a jig 1 as shown in FIG. 5 is used (see Patent Document 1). In the four-point bending strength test using the jig 1 shown in FIG. 5, the test piece S is placed on the fulcrum 2 and the fulcrum 3 of the support jig 9. A load jig 6 having a fulcrum 4 and a fulcrum 5 is placed. Thereafter, a vertical downward load is applied to the load jig 6, and the bending strength of a test piece such as ceramic is measured.

  Further, a test apparatus having a balance structure (lever structure) is also disclosed as a bending strength test apparatus based on a four-point bending strength test method (see Patent Document 2).

Japanese Patent Laid-Open No. 5-322728 Japanese Patent Laid-Open No. 10-82725

  Since the jig described in Patent Document 1 can prevent the weight from being eccentric, the measurement error due to the eccentricity of the weight can be reduced.

  However, in the jig described in Patent Document 1, there is a concern that the test piece may be damaged when the bending strength is measured for the test piece having a low bending strength.

  In the test apparatus having the balance structure described in Patent Document 2, the weight (load jig 6) for applying a load to the test piece S is centered on the center point O as in the test apparatus 120 having the balance structure shown in FIG. Move around the circumference of the circle. Therefore, the direction of the load applied by the load jig 6 to the test piece S is not the vertical direction. That is, in the test apparatus having a balance structure, the load jig 6 moves circularly. Therefore, the load point applied to the test piece S changes. Furthermore, the magnitude | size of the load of the perpendicular direction added to the test piece S will change. As a result, the bending strength and deflection (displacement amount) of the test piece cannot be measured accurately. Thus, it is difficult to measure the bending strength of the test piece with high accuracy in the bending strength test apparatus having the balance structure.

  As a method for measuring the bending strength, a method using a test apparatus (universal testing machine) as shown in FIG. 6 is conceivable. However, this universal testing machine cannot measure the bending strength of a test piece with high accuracy. That is, in the universal testing machine, since the displacement amount of the crosshead is measured as the displacement amount of the test piece, the displacement amount of the test piece is not directly measured. Therefore, the bending strength of the test piece cannot be measured with high accuracy. Moreover, since a universal testing machine puts a weight on a test piece prior to measurement, the test piece with low bending strength may be destroyed before measurement due to its own weight. Further, the distortion and deflection of the test piece generated by the weight of the weight may affect the measurement of the bending strength, and the bending strength may not be measured with high accuracy. The universal testing machine 110 shown in FIG. 6 includes a support jig 9 having two fulcrums 2 and 3, a load jig 6 that directly applies a load to the test piece S, and a pressing device that pushes the load jig 6 in the vertical direction. A tool 7 and a load measuring unit 60 for measuring a load applied to the load jig 6 by the pushing jig 7 are provided.

  From the above, development of a bending strength test apparatus that can perform a bending strength test with high accuracy and can perform a bending strength test even with a test piece having a low bending strength has been desired.

  The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide a bending strength test apparatus capable of performing a bending strength test with high accuracy and capable of performing a bending strength test even on a test piece having a low bending strength.

  According to the present invention, the following bending strength test apparatus is provided.

[1] A base portion having a flat plate-like portion, and two base-side projections that are spaced apart from each other on the surface of the plate-like portion, and the base side of the base portion One or two load jig side projections located between the two base side projections at the time of measuring the bending strength of the test piece on the surface of the base that faces the surface of the base. The load jig side projection is in contact with the test piece to apply a load when measuring the bending strength of the test piece, and is fixed to the base, and the load control is performed by a strict linear motion mechanism. A load jig holding arm for moving the tool on a straight line parallel to the vertical direction, and the load jig in a state where the weight of the load jig is not applied to the test piece before measuring the bending strength of the test piece. A load jig holding means for holding the load jig, and A bending strength testing apparatus comprising: a load applying unit that applies a load in a direction; and a load measuring unit that measures a load applied to the load jig by the load applying unit when measuring the bending strength of the test piece.

[2] The load jig holding means is connected to the load jig holding arm, has the same weight as the load jig, and is a load canceling weight that cancels the weight of the load jig. ] The bending strength test apparatus as described in any one of.

[3] The method according to [1] or [2], further including a first laser displacement meter that irradiates a surface of the base side of the test piece with a laser and measures a displacement amount of the test piece by the irradiated laser. Bending strength test equipment.

[4] A large through-hole for passing a laser that is a through-hole through which the laser irradiated from the first laser displacement meter passes is formed in the plate-like portion of the base, and the first laser displacement meter is The plate-like portion of the base is disposed on the surface opposite to the surface on which the base-side protrusion is disposed, and the surface side of the plate-like portion in the base of the large through hole for passing laser A small through hole for laser passage, which is a through hole through which the laser passes, is formed on the surface of the base portion on which the base side protrusion is disposed. A debris drop prevention jig that covers the opening on the surface side of the plate-like portion of the large through hole for laser passage and the debris fall prevention jig Small through hole for laser passage and the plate shape of the base Bending strength testing apparatus according to [3], wherein disposed as laser and large through-hole overlaps a pass in.

[5] A second laser displacement meter that irradiates the load jig with a laser, calculates a moving distance of the load jig from the start of measurement to the end of measurement by the irradiated laser, and sets the displacement amount of the test piece. The bending strength test apparatus according to any one of [1] to [4].

[6] A first information storage unit that is connected to the first laser displacement meter and the second laser displacement meter and stores information from the first laser displacement meter and the second laser displacement meter, and the load applying unit. And a second information storage unit that is connected to the load measurement unit and stores information from the load application unit and the load measurement unit, and is connected to the first information storage unit and the second information storage unit, The bending strength testing apparatus according to [5], further comprising: an information processing unit that processes the information stored in one information storage unit and the second information storage unit.

[7] The bending strength test apparatus according to any one of [1] to [6], wherein the bending strength and Young's modulus of the test piece can be measured.

  Since the bending strength test apparatus of the present invention includes the load jig holding arm that moves the load jig in parallel with the vertical direction by a strict linear motion mechanism, it is possible to apply a load to the test piece with high accuracy. The bending strength test apparatus of the present invention includes a load jig holding means for holding the load jig in a state where the weight of the load jig is not applied to the test piece before measuring the bending strength of the test piece. The weight of the jig does not hit the specimen. Therefore, even a test piece with low bending strength is not broken by the load jig before the test is started. As described above, since the bending strength test apparatus of the present invention includes the load jig holding arm and the load jig holding means, the bending strength test can be performed with high accuracy and even a test piece with low bending strength can be used. A bending strength test can be performed.

It is a front view which shows typically one Embodiment of the bending strength test apparatus of this invention. It is the side view which looked at the bending strength test apparatus shown in FIG. 1 from the side surface side. It is sectional drawing which expands the area | region P shown in FIG. 1, and shows a cross section typically. It is a front view which shows typically the jig | tool for a fragment fall prevention of the bending strength test apparatus shown in FIG. It is a front view which shows the conventional bending strength test apparatus typically. It is a front view which shows typically the universal testing apparatus used for the bending strength measurement of a test piece. It is a front view which shows typically a testing apparatus provided with a balance structure. It is a front view which shows typically the bending strength test apparatus which is not equipped with a load jig holding means. It is explanatory drawing explaining a exact linear motion mechanism. It is a perspective view which shows typically an example of "the test piece of 1 cell structure". It is a perspective view which shows typically an example of "the test piece of one rib."

  Embodiments of the present invention will be described below. The present invention is not limited to the following embodiments, and appropriate modifications and improvements are added to the following embodiments on the basis of ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that what has been described also falls within the scope of the invention.

[1] Bending strength test equipment:
As an embodiment of the bending strength test apparatus of the present invention, a bending strength test apparatus 100 shown in FIGS. The bending strength test apparatus 100 includes a “flat plate-like portion 11” and “a base-side protruding portion 12 that supports two test pieces S that are spaced apart from each other on the surface 11 a of the plate-like portion 11. ”. The bending strength test apparatus 100 includes a load jig 20 positioned above the base side protrusion 12 of the base 10. This load jig 20 has two load jig side projections 21 positioned between the two base side projections 12 when measuring the bending strength of the test piece S on the surface 20a facing the surface 11a of the base 10. Then, when measuring the bending strength of the test piece S, the load jig side projection 21 abuts against the test piece S and applies a load. The bending strength test apparatus 100 includes a load jig holding arm 30 that is fixed to the base 10 and moves the load jig 20 on a straight line parallel to the vertical direction by a strict linear motion mechanism. Furthermore, the bending strength test apparatus 100 includes load jig holding means 40 for holding the load jig 20 in a state where the weight of the load jig 20 is not applied to the test piece S before measuring the bending strength of the test piece S. ing. The bending strength test apparatus 100 includes a load applying unit 50 that applies a downward load in the vertical direction to the load jig 20 and a load applied to the load jig 20 by the load applying unit 50 when measuring the bending strength of the test piece S. A load measuring unit 60 for measuring. The “self-weight” means the weight of the load jig itself, and “the state where the load jig does not apply its own weight” means that the load due to the weight of the load jig is applied to the test piece. It means not in the state.

  Since the bending strength test apparatus 100 includes the load jig holding arm 30 that moves the load jig in parallel with the vertical direction by a strict linear motion mechanism, the load can be applied to the test piece S with high accuracy. The bending strength test apparatus 100 includes load jig holding means 40 that holds the load jig 20 in a state where the weight of the load jig is not applied to the test piece S before measuring the bending strength of the test piece S. The weight of the load jig 20 is not applied to the test piece S. Therefore, even a test piece with low bending strength is not broken by the load jig 20 before the test is started. Thus, since the bending strength test apparatus 100 includes the load jig holding arm 30 and the load jig holding means 40, the bending strength test can be performed with high accuracy and even a test piece with low bending strength can be used. A bending strength test can be performed. Note that the bending strength test apparatus 100 can accurately perform a bending strength test on a test piece having a high bending strength.

  The bending strength test apparatus 100 can measure the bending strength and Young's modulus of the test piece S. That is, as described above, since the bending strength test apparatus 100 can accurately perform a bending strength test even on a test piece having a low bending strength, the bending strength (displacement amount) of the test piece is measured simultaneously with the bending strength. can do. Therefore, the Young's modulus can be calculated from the measured values of bending strength and deflection. That is, the bending strength and Young's modulus can be measured with a single test.

  Moreover, it is smaller than a conventional bending strength test apparatus (for example, a universal testing machine) and can be manufactured at a low cost.

  In addition, as a test piece with low bending strength, thin plate-shaped things, such as ceramics, metal, confectionery, can be mentioned, for example.

  FIG. 1 is a front view schematically showing an embodiment of a bending strength test apparatus of the present invention. FIG. 2 is a side view of the bending strength test apparatus shown in FIG. 1 viewed from the side.

  The load jig holding arm can move the load jig parallel to the vertical direction by a strict linear motion mechanism. Since the load jig holding arm is provided, the bending strength test apparatus of the present invention can apply a load to the test piece with high accuracy. That is, the bending strength test apparatus of the present invention can accurately measure the bending strength and deflection (displacement amount) of the test piece.

  As the “strict linear motion mechanism”, there are a porsrier mechanism and a heart mechanism. Of these, the bending strength test apparatus of the present invention preferably includes a load jig holding arm having a Porsche mechanism.

The exact linear motion mechanism is a mechanism that converts circular motion into linear mobility. Specifically, in FIG. 9, when the sides e and f are rotated about the point O ₁ and the side g is rotated about the point O ₂ , the point P ₁ moves linearly. FIG. 9 is an explanatory diagram for explaining the Porsche mechanism (strict linear motion mechanism). In FIG. 9, the sides a, b, c, and d all have the same length, and the sides e and f have the same length. Further, “the length of the side g” and “the length between the point O ₁ and the point O ₂ ” are the same. The points O ₁ and O ₂ are fixed points. The sides e and f rotate around the point O ₁ and the side g rotates around the point O ₂ .

Each side is fixed to each other so as to be rotatable and movable at the intersection with the other side. Specifically, the sides a, b, and e are rotated by the “end opposite to the point O ₁ ” of the side e, the “ _one end” of the side a, and the “one end” of the side b. They are fixed to each other so as to be movable and movable. The sides c, d, and f are such that the “end opposite to the point O ₁ ” of the side f, the “ _one end” of the side c, and the “one end” of the side d are rotatable and movable. They are fixed to each other. The sides a, d, and g are such that the “end opposite to the point O ₂ ” of the side g, the “other end” of the side a, and the “other end” of the side d are rotatable and movable. They are fixed to each other. The side b and the side c are fixed to each other such that the “other end” of the side b and the “other end” of the side c are rotatable and movable. A point where the side b and the side c are fixed to each other is a point P ₁ that moves on the straight line L.

In FIG. 9, the graphic drawn with a broken line shows a shape obtained by rotating the sides e, f, and g of the graphic drawn with a solid line clockwise. That is, when the sides e, f, and g are rotated clockwise, the sides e, f, and g move to the sides e ′, f ′, and g ′, respectively, and the sides a, b, c, and d become the sides a ′. , B ′, c ′, d ′, respectively. At this time, the point _{P 1} is moved to the point _{P 1} ', the point _{P 1} is always moved on the straight line L (linear movement). Such a mechanism is called “strict linear motion mechanism”. The bending strength test apparatus of the present invention includes a load jig holding arm having such a “strict linear motion mechanism”. When a load is applied to the point P ₁ on the load jig holding arm, the point P ₁ is , always linear movement (ie, the locus of the point P _1, be sure to draw a straight line).

  The load jig holding arm 30 of the bending strength test apparatus 100 includes a circular motion part 31 having a pair of first circular motion plates 35 and one second circular motion plate 36, and a distance adjustment connected to the circular motion unit 31. Part 32. The distance adjustment unit 32 includes a right adjustment frame 33a having four distance adjustment plates 37 connected to each other so as to form a square, and a left adjustment frame 33b having four distance adjustment plates 37 connected to each other so as to form a rectangle. And. Furthermore, the distance adjustment unit 32 includes four connecting rods 34a, 34b, 34c, and 34d that connect the right adjustment frame 33a and the left adjustment frame 33b. The right adjustment frame 33a has first to fourth vertex portions 37a, 37b, 37c, and 37d. The left adjustment frame 33b has first to fourth vertex portions. The connecting rods 34a, 34b, 34c, and 34d are respectively the vertices of the right adjustment frame 33a (from the first vertex portion to the fourth vertex portion) and the vertices of the left adjustment frame 33b (from the first vertex portion to the fourth vertex portion). Are linked.

  A free end of the second circular motion plate 36 is rotatably connected to the first connecting rod 34a that connects the first apex portion 37a of the right adjustment frame 33a and the first apex portion of the left adjustment frame 33b. . In the right adjustment frame 33a, a vertex at a position moved clockwise from the first vertex 37a in FIG. 1 is defined as a second vertex 37b. One of the first circular motion plates 35 of the circular motion portion 31 (first circular motion) is connected to the second connecting rod 34b that connects the second vertex portion 37b of the right adjustment frame 33a and the second vertex portion of the left adjustment frame 33b. Plates 35a) are pivotally connected. Further, in the right adjustment frame 33a, a vertex at a position moved counterclockwise in FIG. 1 from the first vertex 37a is defined as a third vertex 37c. The third connecting rod 34c that connects the third vertex portion 37c of the right adjustment frame 33a and the third vertex portion of the left adjustment frame 33b is connected to the other of the first circular motion plates 35 of the circular motion portion 31 (first circular motion). A plate 35b) is rotatably connected. Then, in the right adjustment frame 33a, the vertex at the position moved clockwise from the second vertex 37b in FIG. 1 is defined as a fourth vertex 37d. The load jig 20 is held by the fourth connecting rod 34d that connects the fourth vertex portion 37d of the right adjustment frame 33a and the fourth vertex portion of the left adjustment frame 33b.

  The first circular motion plate 35 and the second circular motion plate 36 of the circular motion part 31 can rotate around different fixed rotational axes, respectively. That is, the first circular motion plate 35 is rotatable about the fixed first rotation shaft 38a. The second circular motion plate 36 is rotatable about a fixed second rotation shaft 39a. The first circular motion plate 35 is rotatably fixed to a first rotation shaft 38 a disposed on a first fixed column 38 fixed to the plate-like portion 11 of the base portion 10. The second circular motion plate 36 is rotatable to two second fixed columns 39 fixed to the plate-like portion 11 of the base portion 10, on a second rotation shaft 39 a disposed across these second fixed columns 39. It is fixed to.

  One distance adjustment plate 37 of the right adjustment frame 33a in the distance adjustment unit 32 is rotatably connected to another distance adjustment plate 37 at the end. Therefore, the right adjustment frame 33a is a square with a variable area. Similarly, one distance adjustment plate of the left adjustment frame 33b in the distance adjustment unit 32 is rotatably connected to another distance adjustment plate at the end. Therefore, the left adjustment frame 33b is a variable-area square. Note that the right adjustment frame 33a and the left adjustment frame 33b are connected by four connecting rods 34a, 34b, 34c, and 34d at four vertex portions (first to fourth vertex portions), and thus the right adjustment frame 33a. And the area of the left adjustment frame 33b change in conjunction with each other. Accordingly, the load jig holding arm 30 moves the load jig 20 held by the distance adjustment unit 32 in parallel in the vertical direction by the deformation of the distance adjustment unit 32 when the circular movement unit 31 moves circularly. be able to.

  The first circular motion plate 35a, the first circular motion plate 35b, and the (first circular motion plate 35) of the circular motion unit 31 have the same length, and the right adjustment frame 33a and the left adjustment frame 33b in the distance adjustment unit 32, respectively. The four distance adjusting plates are the same length. Further, the distance between the first connecting rod 34a of the distance adjusting unit 32 and the second rotating shaft 39a is the same as the distance between the first rotating shaft 38a and the second rotating shaft 39a.

  The bending strength test apparatus 100 has a load jig holding means (a load canceling weight) on the end of the second circular motion plate 36 of the circular motion portion 31 opposite to the end connected to the distance adjustment portion 32. ) 40 is fixed.

  The load jig holding means is capable of holding the load jig in a state where the weight of the load jig is not applied to the test piece before measuring the bending strength of the test piece. The load jig is held by the load jig holding means, and the weight of the load jig is not applied to the test piece (the load is canceled). The specimen is prevented from being destroyed.

  The load jig holding means may be, for example, a weight made of a lump of metal or the like, or a traction device that can pull the load jig. The load jig holding means is preferably connected to the load jig holding arm, has the same weight as the load jig, and is a load canceling weight that cancels the weight of the load jig. With such a weight, the weight of the load jig can be offset easily and reliably at low cost. The weight for weight cancellation is preferably the same weight as the load jig, but can be made lighter than the load jig by adjusting the position where the weight for weight cancellation is suspended. Further, the load jig holding means may hold the test piece so that the weight of the load jig is not applied to the test piece before the test, and the load jig and the test piece may be in contact before the test.

  As the two base side protrusions of the base, the same protrusions (fulcrum) as supporting the test piece in a conventionally known bending strength test apparatus can be used.

  As shown in FIG. 2, the load jig 20 has a metal columnar portion 22 and a load jig main body 25 having a holder 23 fitted to the columnar portion 22 so as to cover the columnar portion 22 from above. And a load jig side protrusion 21. The columnar portion 22 has a coupling protrusion 24 having a through hole formed on the top surface 22a. The load jig holding arm 30 holds the load jig 20 by the fourth connecting rod 34d of the load jig holding arm 30 being rotatably fitted in the through hole of the coupling protrusion 24. . The number of the protrusions 21 on the load jig side is one in the three-point bending strength test and two in the four-point bending strength test.

  The load applying unit is not particularly limited as long as a load downward in the vertical direction can be applied to the load jig, and those used in a conventionally known bending strength test apparatus can be used. The load measuring unit measures the load applied to the load jig by the load applying unit when measuring the bending strength of the test piece, and a load measuring unit used in a conventionally known bending strength test apparatus can be used.

The bending strength test apparatus 100 preferably includes a first laser displacement meter 70 that irradiates the surface S ₁ on the base 10 side of the test piece S with laser and measures the displacement amount of the test piece S with the irradiated laser. . By providing such a first laser displacement meter 70, the amount of displacement of the test piece can be accurately measured.

  Further, the bending strength test apparatus 100 irradiates the load jig 20 with a laser, calculates the movement distance of the load jig 20 from the start of measurement to the end of measurement by the irradiated laser, and sets the displacement amount of the test piece S as the displacement amount. A two-laser displacement meter 71 is preferably provided. By providing such a second laser displacement meter 71, when the test piece is a ceramic material, the displacement amount of the test piece can be accurately measured. That is, since the test piece made of a ceramic material has irregularities on the surface, even if the laser is irradiated to the test piece by the first laser displacement meter 70, the displacement amount of the test piece may not be measured with high accuracy. was there. Therefore, by providing the second laser displacement meter 71, the moving distance of the load jig 20 is accurately calculated by irradiating the load jig 20, not the test piece, with a laser, and the displacement amount of the test piece S is accurately determined. It can be measured well.

  The bending strength test apparatus 100 is connected to a first laser displacement meter 70 and a second laser displacement meter 71, and includes a first information storage unit 80 that stores information from the first laser displacement meter 70 and the second laser displacement meter 71. I have. The bending strength test apparatus 100 includes a second information storage unit 81 that is connected to the load application unit 50 and the load measurement unit 60 and stores information from the load application unit 50 and the load measurement unit 60. Furthermore, the bending strength test apparatus 100 is connected to the first information storage unit 80 and the second information storage unit 81, and is an information processing unit that processes information stored in the first information storage unit 80 and the second information storage unit 81. 83.

  As shown in FIG. 1, in the bending strength test apparatus 100, the first laser displacement meter 70 is disposed on the surface of the plate-like portion 11 of the base 10 opposite to the surface on which the base-side protrusion 12 is provided. Has been. Therefore, a large through hole 11b for laser passage, which is a through hole through which the laser irradiated from the first laser displacement meter 70 passes, is formed in the plate-like part 11 of the base 10.

  The bending strength test apparatus 100 includes a debris fall prevention jig 90 (see FIGS. 3 and 4) disposed on the surface (surface 11 a) of the plate-like portion 11 of the base 10 on which the base-side protrusion 12 is disposed. It has. As shown in FIG. 3, the fragment drop prevention jig 90 is a through hole having a smaller opening area than the opening on the surface 11a side of the plate-like part 11 in the base part 10 of the large through hole 11b for passing laser, and through which the laser passes. A small through hole 90a for laser passage is formed. The fragment drop prevention jig 90 covers the opening on the surface 11a side of the plate-like portion 11 of the large through hole 11b for passing laser and is a plate of the small through hole 90a for passing laser and the base 10 of the fragment drop prevention jig 90. The large passage hole 11b for laser passage in the shape portion 11 is disposed so as to overlap. FIG. 3 is a cross-sectional view schematically showing a cross-section by enlarging the region P shown in FIG. FIG. 4 is a front view schematically showing a fragment drop prevention jig of the bending strength test apparatus shown in FIG.

  By providing the debris drop prevention jig 90, it is possible to prevent debris generated when the test piece is broken by the bending strength test from falling into the laser through large through hole 11b. Therefore, it is possible to save the trouble of performing large-scale calibration, laser adjustment, and cleaning of the large through-hole 11b for passing laser, and a bending strength test can be continuously performed. Therefore, the bending strength test can be performed efficiently. That is, when measuring the bending strength test for many test pieces, the measurement time can be greatly shortened. Here, “the test piece is destroyed by the bending strength test” means that the test piece is destroyed as a normal result of the bending strength test.

  The fragment drop prevention jig has a small through-hole for laser passage, which is a through-hole that has a smaller opening area than the opening on the surface side of the base of the large through-hole for laser passage, and does not interfere with the bending strength test. As long as it is a thing, there is no restriction | limiting regarding a shape, a material, thickness, etc.

  The shape of the fragment drop prevention jig can be a circle, an ellipse, a quadrangle, or the like in a cross section orthogonal to the extending direction of the laser passage small through hole.

  The shape of the small through hole for laser passage is not particularly limited, and the shape of the small through hole for laser passage in the cross section orthogonal to the extending direction of the small through hole for laser passage may be a circle, an ellipse, a quadrangle, etc. Can do.

  Examples of the material for the debris fall prevention jig include stainless steel (SUS), iron, aluminum, and resin.

  Note that the distance between the base plate-like portion and the test piece (distance before the start of the bending strength test) is usually 20 to 50 mm, and the thickness of the fragment drop prevention jig is 2 to 5 mm. preferable.

[2] Manufacturing method of bending strength test apparatus:
The bending strength test apparatus of the present invention can be manufactured as follows. First, a load jig holding arm having a strict linear motion mechanism is prepared. Next, the load jig is fixed to the end of the load jig holding arm on the side of linear movement. Next, a base side projection that supports the test piece and a base having a flat plate-like plate part having two base side projections on the surface are prepared, and a load jig is provided above the base side projection of the base. The load jig holding arm is fixed to the base so as to be arranged. Next, the load jig holding means is fixed to the load jig holding arm so as to hold the load jig in a state where the weight of the load jig is not applied to the test piece before measuring the bending strength of the test piece. Next, a load applying unit having a load measuring unit at the tip is fixed above the load jig at the base. In this way, the bending strength test apparatus of the present invention can be manufactured.

[3] Bending strength test using bending strength test equipment:
The bending strength test by the bending strength test apparatus of the present invention can be performed as follows. First, the test piece is placed on the base side protrusion so as to be supported by the two base side protrusions of the base in the bending strength test apparatus of the present invention. In the bending strength test apparatus of the present invention, since the weight of the load jig is not applied to the test piece in this state, the test piece is not broken by the weight of the load jig. Next, a load downward in the vertical direction is applied to the load jig by the load applying unit. Thus, when a downward load in the vertical direction is applied, the load jig moves in parallel to the vertical direction by the load jig holding arm. Next, one or two load jig side protrusions of the load jig come into contact with each other, and a load is applied to the test piece in parallel to the vertical direction. The load at this time is measured by the load measuring unit and is measured until the test piece is broken. Next, the load when the test piece is broken and the deflection (displacement amount) of the test piece are measured and the Young's modulus is measured. In this way, the bending strength test apparatus of the present invention can perform a bending strength test of a test piece.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples.

  The “strength”, “deflection”, and “Young's modulus” were measured as follows for each of the test pieces A to J shown in Table 1 using the bending strength test apparatus of the following examples and comparative examples. Thereafter, each of the test pieces A to J was evaluated for “strength”, “deflection”, and “Young's modulus”.

[Strength]
First, the strength of the test pieces A to J was measured using an existing bending strength tester (see Comparative Examples 1 to 3). Next, using the bending strength test apparatus of Example 1, the strength of a test piece having the same conditions as the material and the test piece used in an existing bending strength tester was measured. Thereafter, evaluation was performed according to the following criteria. When the bending strength can be measured, it is evaluated as “OK”. “NG” when the bending strength cannot be measured (that is, when the test piece breaks because a non-vertical load is applied to the test piece, or when the test piece breaks due to the weight of the load jig) .

[Deflection]
First, the deflection of each test piece was measured using an existing bending strength tester (see Comparative Examples 1 to 3). Using the bending strength test apparatus of Example 1, the deflection of a test piece having the same conditions as the material and the like used in an existing bending strength tester was measured. Thereafter, evaluation was performed according to the following criteria. When the deflection can be measured, it is evaluated as “OK”. If the deflection could not be measured (that is, if the test piece broke because a non-vertical load was applied to the test piece, or if the test piece broke due to the weight of the load jig), "NG" I write. In addition, when the bending strength test apparatus of Example 1 was used, [deflection] could be measured together with the above [strength] measurement (simultaneously with the above [strength] measurement).

[Young's modulus]
First, the Young's modulus of each test piece was measured using an existing bending strength tester (see Comparative Examples 1 to 3). Using the bending strength test apparatus of Example 1, the Young's modulus of a test piece having the same conditions as the material and the like of the test piece used in the existing bending strength tester was measured. Thereafter, evaluation was performed according to the following criteria. When the Young's modulus can be measured, it is evaluated as “OK”. “NG” when the Young's modulus cannot be measured (that is, when the test piece breaks because a non-vertical load is applied to the test piece, or when the test piece breaks due to the weight of the load jig) .

Example 1
A bending strength test apparatus as shown in FIG. 1 was prepared. The bending strength test apparatus of the present embodiment includes a base portion having a base-side protrusion and a flat plate-like portion that supports a test piece, a load jig having two load jig-side protrusions, and a strict linear motion mechanism. And a load jig holding arm that moves the load jig parallel to the vertical direction. In addition, the bending strength test apparatus according to the present embodiment includes a load canceling weight as a load jig holding means, measures a load applied to the load jig and applies a load in the vertical direction downward, and a load applied to the load jig. And a load measuring unit. Furthermore, the bending strength test apparatus of the present example was provided with a first laser displacement meter, a second laser displacement meter, and a fragment drop prevention jig. The bending strength test apparatus of the present embodiment includes a first information storage unit connected to the 1 laser displacement meter and the second laser displacement meter, a second information storage unit connected to the load applying unit and the load measurement unit, And an information processing unit connected to the first information storage unit and the second information storage unit.

  The bending strength test apparatus of this example was able to measure “strength”, “deflection”, and “Young's modulus” for all the test pieces (test pieces A to J). These evaluation results are shown in Table 2.

  In Table 1, “Ceramic material, metal, food” indicates the material of the test piece, and indicates that the test piece is a ceramic material, metal, or food, respectively. Here, as a test piece made of “ceramic material”, the following “honeycomb structure” was prepared, and then a predetermined part was cut out from this honeycomb structure. “Cd, SiC, AT (3 levels)” in the “Material” column indicates that test pieces made of Cd, SiC, and AT materials (three test pieces in total) were used. That is, a “honeycomb structure” made of each material of Cd, SiC, and AT was prepared, and a predetermined part of the honeycomb structure was cut out as a test piece. “Cd” indicates a test piece made of “cordierite”. “SiC” indicates a test piece made of “silicon carbide”. “AT” indicates a test piece made of “aluminum titanate”. “None” in the column “Coating” indicates that a test piece was obtained by cutting a predetermined part from the “honeycomb structure” on which no catalyst was supported. “Present” indicates that a specimen obtained by cutting a predetermined part from a catalyst supported on the following “honeycomb structure” at a supported amount of 150 g / L (catalyst body) was used.

  Here, the “honeycomb structure” is disposed in an exhaust passage of an engine such as an automobile and used as a filter for purifying exhaust gas discharged from the engine. This “honeycomb structure” is made of a ceramic material and has a porous partition wall that extends from an inflow end surface, which is one end surface, to an outflow end surface, which is the other end surface, and defines a plurality of cells serving as exhaust gas flow paths. doing. An outer peripheral coating material made of a material such as SiC or cordierite is formed on the outer peripheral surface of the honeycomb structure. Further, an exhaust gas purifying catalyst may be carried on the surface of the partition walls of the honeycomb structure.

In the “Structure” column of “Structure of test piece”, “One cell structure test piece” arbitrarily selects one cell formed in the above “honeycomb structure”, and specifies the partition that forms this cell. And it shows that what was cut out all the specified partition walls was used as a test piece. FIG. 10 is a perspective view schematically showing an example of “test piece S _{10 having} a one-cell structure”. A “one-cell test piece S ₁₀ ” shown in FIG. 10 is cut from a honeycomb structure in which cells A having a quadrangular cross-sectional shape perpendicular to the cell A extending direction are formed. In the “Structure” column of “Structure of test piece”, “One piece of test piece of rib” can arbitrarily select one cell formed in the “honeycomb structure” and specify the partition that forms this cell. And it shows that what cut out arbitrary one of the specified partition was made into the test piece. FIG. 11 is a perspective view schematically showing an example of “one test piece S _{100 with} one rib”.

  “30, 50, 65 (3 levels)” in the “Porosity (%)” column of “Test specimen structure” corresponds to test specimens made of Cd, SiC, and AT materials (total of three specimens). The porosity (%) is shown. That is, the porosity (%) of each test piece made of Cd, SiC, and AT is 30%, 50%, and 65%.

  The numerical values in the column of “Test specimen structure” indicate the test specimen conditions (total three specimens) made of each material of Cd, SiC, and AT and the test specimen conditions corresponding to the porosity (%). That is, for example, in “0.847, 0.898, 1.037 (3 levels)”, the thicknesses of the test pieces made of Cd, SiC, and AT are 0.847 mm, 0.898 mm, and 1.037 mm, respectively. It is shown that. The “thickness” of the test piece refers to the length in the direction (load direction) in which the test piece is loaded when the strength or the like is measured with a bending strength test apparatus. This is the length in the direction indicated by the symbol “T” in FIGS. 10 and 11.

  The numerical value in the “length (mm)” column of “test piece structure” indicates the length (mm) of the test pieces (total three test pieces) made of each material of Cd, SiC, and AT. That is, for example, “20” indicates that the length of the test piece made of Cd, the length of the test piece made of SiC, and the length of the test piece made of AT are all “20 mm”. Note that the “length” of the test piece refers to the length in the cell extending direction of the honeycomb structure when the test piece is cut out. This is the length in the direction indicated by the symbol “l” in FIGS.

  The numerical value in the “width (mm)” column of “test piece structure” indicates the width (mm) of test pieces (total of three test pieces) made of each material of Cd, SiC, and AT. That is, for example, “1” indicates that the length of the test piece made of Cd, the length of the test piece made of SiC, and the length of the test piece made of AT are all “1 mm”. The “width” of the test piece refers to a length in a direction perpendicular to both the “thickness” direction and the “length” direction of the test piece.

  The “outer peripheral coating material” is a thin plate obtained by cutting out the outermost portion (including the outer peripheral surface) into a thin plate shape from the honeycomb structure in which the outer peripheral coating agent is applied to the outer peripheral surface and the outer peripheral coating material is formed. It shows that. “0.5, 1, 2 (3 levels)” of the thickness (mm) in the “outer peripheral coating material” indicates that three “outer peripheral coating materials” having different thicknesses were used.

  “Wafer” indicates a trade name “Barley-Fanilla” (thickness 10 mm) manufactured by Takeda Seika Co., Ltd. “Chewing gum” indicates a trade name “Black Black Gum” (thickness: 1.65 mm) manufactured by Lotte. The temperature at the time of measurement of “wafer” and “chewing gum” was 24.6 ° C., and the humidity was 20.0%.

  The evaluation results of “strength”, “deflection”, and “Young's modulus” shown in Table 2 are shown for all types of test pieces when there are a plurality of types of test pieces. That is, for example, in Example 1, the evaluation of “OK” in the “strength” of the test piece A is “strength” for all test pieces of the test piece made of Cd, the test piece made of SiC, and the test piece made of AT. "Is an evaluation of" OK ".

(Comparative Example 1)
“Strength”, “deflection”, and “Young's modulus” were measured for the test pieces A to J in the same manner as in Example 1 except that the bending strength test was performed using a universal testing machine (see FIG. 6). Thereafter, in the same manner as in Example 1, each evaluation of “strength”, “deflection”, and “Young's modulus” was performed. The evaluation results are shown in Table 2.

  As the universal testing machine of this comparative example, specifically, model number “3366” manufactured by INSTRON Corporation was used.

(Comparative Example 2)
“Strength”, “deflection”, and “Young's modulus” of the test pieces A to J were measured in the same manner as in Example 1 except that a test apparatus having a balance mechanism as shown in FIG. 7 was used. Thereafter, in the same manner as in Example 1, each evaluation of “strength”, “deflection”, and “Young's modulus” was performed. The evaluation results are shown in Table 2. In addition, since the test apparatus of this comparative example was equipped with the counterweight 93, the test piece was not destroyed before the start of the test, but the vertical load applied to the test piece was not constant, An accurate measurement value could not be obtained. That is, the test apparatus of this comparative example includes a balance mechanism, and the load jig moves circularly because of the balance structure. Therefore, the load point applied to the test piece has changed. Furthermore, the vertical load applied to the test piece has changed. As a result, accurate measurement values could not be obtained.

  The test apparatus of this comparative example (the test apparatus 120 having the balance structure shown in FIG. 7) includes a support jig 9 having two base side protrusions 91 and 92 that support the test piece S, and the support jig 9. And a fixed balance portion 8. The balance unit 8 was provided with a support column 8a fixed to the support jig 9, and a balance rod 8b fixed to the support column 8a so as to be rotatable. Further, the test apparatus (test apparatus 120) of this comparative example includes a load jig 6 having two load jig side protrusions at one end of the balance bar 8b of the balance unit 8, and the other end of the balance bar 8b. A weight (counterweight 93) for maintaining a balance with the load jig 6 was provided at the portion. That is, the counterweight 93 prevents the weight of the load jig 6 from being applied to the test piece S before the test is started. Further, the test apparatus 120 includes a load applying unit 94 that applies a downward load in the vertical direction to the load jig 6, and a load measurement unit 95 that measures a load applied to the load jig 6. Further, the test apparatus 120 was provided with a first laser displacement meter 96 and a second laser displacement meter 97. The test apparatus 120 is connected to a first information storage unit (not shown) connected to the first laser displacement meter 96 and the second laser displacement meter 97, a load application unit 94, and a load measurement unit (95). And a second information storage unit (not shown). Furthermore, the test apparatus 120 includes an information processing unit (not shown) connected to the first information storage unit and the second information storage unit.

(Comparative Example 3)
“Strength”, “deflection”, and “Young's modulus” for the test pieces A to J are the same as in Example 1 except that a bending strength test apparatus that does not include a load jig holding means as shown in FIG. 8 is used. It was measured. Thereafter, in the same manner as in Example 1, each evaluation of “strength”, “deflection”, and “Young's modulus” was performed. The evaluation results are shown in Table 2.

  FIG. 8 is a front view schematically showing a bending strength test apparatus 130 that does not include a load jig holding means. The bending strength test apparatus 130 shown in FIG. 8 was provided with a base 10 having a plate-like plate-like portion 11 having a base-side protruding portion 12 that supports the test piece S and two base-side protruding portions 12. The bending strength test apparatus 130 was provided with a load jig 20 located above the base 10 and a load jig holding arm 30 that moved the load jig 20 in parallel in the vertical direction by a strict linear motion mechanism. The bending strength test apparatus 130 measures the load applied to the load jig 20 by the load applying unit 50 that applies a downward load in the vertical direction and the load applying unit 20 when the bending strength of the test piece S is measured. And a load measuring unit 60.

  The bending strength test apparatus of this comparative example does not use the load jig holding means (load-canceling weight) in the bending strength test apparatus of Example 1. Since the bending strength test apparatus of this comparative example does not use a load canceling weight, the weight of the load jig is applied to the test piece before measuring the bending strength of the test piece. Depending on the strength of the test piece, It was destroyed before it started.

  From the results of Example 1 and Comparative Examples 1 to 3, it was confirmed that the bending strength test apparatus of Example 1 can perform the bending strength test more accurately than the testing apparatuses of Comparative Examples 1 to 3.

  The bending strength test apparatus of Example 1 was able to accurately perform a bending strength test of a test piece made of a ceramic material (Cd, SiC, AT). Moreover, the bending strength test apparatus of Example 1 was able to accurately perform a bending strength test using a constituent material other than the partition wall such as the outer peripheral coating material as a test piece. Since the bending strength test apparatus of Example 1 was able to accurately perform the bending strength test on “one-cell structure test piece”, the bending strength due to the difference in cell shape (for example, a square cell, a hexagonal cell, etc.). It is possible to accurately measure the difference. Furthermore, the bending strength test apparatus of Example 1 can also calculate Young's modulus excluding cell structural rigidity.

  The bending strength test apparatus of the present invention can perform a bending strength test with high accuracy.

1: jig, 2, 3, 4, 5: fulcrum, 6: load jig, 7: push jig, 8: balance part, 8a: support, 8b: balance bar, 9: support jig, 10: base 11: plate-like portion, 11a: surface, 11b: large through hole for laser passage, 12, 91, 92: base side protrusion, 20: load jig, 20a: facing surface, 21: load jig side protrusion, 22: columnar portion, 22a: top surface, 24: coupling protrusion, 23: holder, 25: load jig main body, 30: load jig holding arm, 31: circular motion portion, 32: distance adjusting portion, 33a: Right adjustment frame, 33b: left adjustment frame, 34a: first connecting rod, 34b: second connecting rod, 34c: third connecting rod, 34d: fourth connecting rod, 35: first circular motion plate, 36: second Circular motion plate, 37: distance adjustment plate, 37a: first vertex portion, 37b: second vertex portion, 37c: third vertex portion, 37d: fourth vertex Part 38: first fixed column 38a: first rotation axis 39: second fixed column 39a: second rotation axis 40: load jig holding means 50, 94: load applying unit 60, 95: Load measurement unit, 70, 96: first laser displacement meter, 71, 97: second laser displacement meter, 80: first information storage unit, 81: second information storage unit, 83: information processing unit, 90: debris drop Blocking jig, 90a: Small through hole for laser passage, 93: Counterweight, 100: Bending strength test device, 110: Universal testing machine, A: Cell, a, b, c, d, e, f, g: Side, S: Test piece, S ₁ : Surface on the base side, S ₁₀ : Test piece of cell structure, S ₁₀₀ : Test piece with one rib, O: Center point, O ₁ , O ₂ , P ₁ : Point , L: straight line, l: length, T: thickness.

Claims (7)

A base having a plate-like plate-like portion and two base-side protrusions that are spaced apart from each other on the surface of the plate-like portion and support the test piece;
One or two positioned above the base-side protrusions of the base and facing the surface of the base between the two base-side protrusions when measuring the bending strength of the test piece A load jig having a load jig side protrusion, and applying a load by contacting the test piece with the load jig side protrusion when measuring the bending strength of the test piece;
A load jig holding arm fixed to the base and moving the load jig on a straight line parallel to the vertical direction by a strict linear motion mechanism;
Before measuring the bending strength of the test piece, load jig holding means for holding the load jig in a state where the weight of the load jig is not applied to the test piece,
A load applying unit for applying a downward load in the vertical direction to the load jig;
A bending strength testing apparatus comprising: a load measuring unit that measures a load applied to the load jig by the load applying unit when measuring the bending strength of the test piece.   The load jig holding means is connected to the load jig holding arm, has the same weight as the load jig, and is a load canceling weight that cancels the weight of the load jig. Bending strength test equipment.   The bending strength test apparatus according to claim 1 or 2, further comprising a first laser displacement meter that irradiates a surface of the base of the test piece with a laser and measures a displacement amount of the test piece by the irradiated laser. The plate-like portion of the base is formed with a large through-hole for passing a laser that is a through-hole through which the laser irradiated from the first laser displacement meter passes, and the first laser displacement meter is connected to the base of the base Disposed on the surface of the plate-like portion opposite to the surface on which the base side protrusion is disposed;
A small through-hole for passing a laser, which is a through-hole through which the laser passes is smaller than an opening on the surface side of the plate-like portion at the base of the large through-hole for passing laser, and the plate of the base A debris drop prevention jig disposed on the surface of the shaped portion on which the base side protrusion is disposed,
The debris drop prevention jig covers the opening on the surface side of the plate-like portion of the laser passage large through hole, and the laser passage small through hole and the base of the fragment fall prevention jig The bending strength test device according to claim 3, wherein the plate-like portion is disposed so as to overlap with the large through hole for laser passage.   2. A second laser displacement meter is provided that irradiates the load jig with a laser, calculates a moving distance of the load jig from the start of measurement to the end of measurement by the irradiated laser, and sets the displacement amount of the test piece. The bending strength test apparatus as described in any one of 1-4. A first information storage unit connected to the first laser displacement meter and the second laser displacement meter and storing information from the first laser displacement meter and the second laser displacement meter;
A second information storage unit connected to the load application unit and the load measurement unit, and storing information from the load application unit and the load measurement unit;
An information processing unit connected to the first information storage unit and the second information storage unit and processing the information stored in the first information storage unit and the second information storage unit. The bending strength test apparatus described.   The bending strength test apparatus according to any one of claims 1 to 6, wherein the bending strength and Young's modulus of the test piece can be measured.

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