JP6358623B2 - Compressive strength test jig and compressive strength test method - Google Patents

Description

  The present invention relates to a compressive strength test jig and a compressive strength test method. More specifically, the present invention relates to a compressive strength test jig and a compressive strength test method capable of more accurately measuring the compressive strength of a honeycomb structure.

  Exhaust gases such as diesel engines contain particulate substances (particulate matter (PM)), toxic gas components such as nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC). It is necessary to prevent it from being released into the atmosphere.

  Therefore, in order to remove PM in exhaust gas and purify toxic gas components, a columnar honeycomb structure having partition walls that define a plurality of cells extending from one end face to the other end face in the exhaust gas flow path ( (Honeycomb filter) is disposed.

  Such a honeycomb structure is housed in a metal can, but is housed under pressure from the can so as not to move in the can. Moreover, a retainer ring may be provided for the purpose of improving the gripping force. At that time, a compressive strength test is performed to evaluate that the strength against the pressure of the exhaust gas is maintained. A universal testing machine is used for this compressive strength test (see, for example, Patent Document 1).

JP 09-299730 A

  However, for example, when the central axis is bent or both end faces are not parallel, and the perpendicularity and parallelism of the honeycomb structure are not accurate, only the conventional test (test using a universal testing machine) is used. In some cases, a uniform pressure could not be applied to the honeycomb structure (that is, a partial pressure sometimes occurred). Therefore, the compressive strength of the honeycomb structure may not be measured accurately. In particular, when the retainer ring was considered, the influence of the bias pressure was large.

  Accordingly, development of a compression strength test jig and a compression strength test method capable of more accurately measuring the compressive strength of the honeycomb structure 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 compressive strength test jig and a compressive strength test method capable of more accurately measuring the compressive strength of a honeycomb structure.

  According to the present invention, the following jig for compressive strength test and compressive strength test method are provided.

[1] A jig for testing the compressive strength in the central axis direction in a columnar honeycomb structure having partition walls that partition and form a plurality of cells extending from one end face to the other end face. And a retainer member disposed on the other end surface side of the honeycomb structure, wherein the movable member includes a block-shaped piston portion and the honeycomb structure. A pressing portion having a pressing plane that is in contact with the end surface and covers the entire end surface; and disposed between the piston portion and the pressing portion. A movable portion that is freely movable, and the retainer member includes an annular metal retainer and an annular cushion retainer disposed on one surface of the metal retainer. The metal retainer and the inner diameter of the cushion retainer, respectively, jig diameter is smaller than the compressive strength test of the end face of the honeycomb structure of the retainer member.

[2] The holding base further includes a holding base having a recess having an opening diameter larger than the opening diameter of the metal retainer, and the holding base is configured so that the opening of the recess covers the opening of the metal retainer. The jig for compressive strength test according to [1], which is disposed on the metal retainer side.

[3] The movable portion of the universal movable member is formed of a sphere, and the piston portion and the pressing portion are formed with a concave portion complementary to the movable portion formed of a sphere. ] The jig for a compressive strength test of description.

[4] The inner diameters of the metal retainer and the cushion retainer of the retainer member may be 4 to 20 mm smaller than the diameter of the other end surface of the honeycomb structure, respectively. Compressive strength test jig.

[5] The pressing portion of the freely movable member has an upper surface that is a plane parallel to the pressing plane, and a taper that continues to the upper surface and the pressing plane, and the area of the upper surface is smaller than the area of the pressing plane. The jig for compressive strength testing according to any one of the above [1] to [4], which has a shape side surface.

[6] On the surface of the cushion retainer of the retainer member in the compressive strength test jig according to any one of [1] to [5], the cushion retainer and one end surface of the honeycomb structure are provided. The honeycomb structure is placed so as to be in contact with each other, and the honeycomb structure is further arranged so that the other end surface of the honeycomb structure and the pressing plane of the pressing portion in the freely movable member are in contact with each other. After that, the compressive strength in the central axis direction of the honeycomb structure is measured by applying pressure to the honeycomb structure through the movable member of the compression strength test jig. Compressive strength test method.

[7] A holding table in which a recess having an opening diameter larger than the opening diameter of the metal retainer is formed below the retainer member, and the opening of the recess of the holding table covers the opening of the metal retainer. In this state, the compressive strength test method according to [6], wherein pressure is applied to the honeycomb structure through the freely movable member of the compressive strength test jig.

  Since the jig for compressive strength testing of the present invention includes a freely movable member and a retainer member, the compressive strength of the honeycomb structure can be measured under conditions closer to the actual use environment.

  Since the compressive strength test method of the present invention uses the compressive strength test jig of the present invention, the compressive strength of the honeycomb structure can be measured under conditions closer to the actual use environment.

It is a perspective view showing typically one embodiment of a jig for compressive strength testing of the present invention. It is a side view which shows typically one Embodiment of the compressive strength test method of this invention.

  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] Compressive strength test jig:
One embodiment of the compression strength test jig of the present invention is a compression strength test jig 100 shown in FIG. The compressive strength test jig 100 is a jig for testing the compressive strength in the central axis direction of a columnar honeycomb structure having partition walls that define a plurality of cells extending from one end face to the other end face. . The compressive strength test jig 100 includes a freely movable member 11 disposed on one end face side of the honeycomb structure and a retainer member 12 disposed on the other end face side of the honeycomb structure. . The freely movable member 11 is disposed between the piston 21, the pressing part 23 having the pressing flat surface 23 a, and the piston part 21 and the pressing part 23. And a movable portion 25 that is movable. The pressing plane 23a is a plane that is in contact with the end face of the honeycomb structure and covers the entire end face. The retainer member 12 includes an annular metal retainer 31 and an annular cushion retainer 33 disposed on one surface of the metal retainer 31. The inner diameters of the metal retainer 31 and the cushion retainer 33 of the retainer member 12 are smaller than the diameter of the end face of the honeycomb structure. FIG. 1 is a perspective view schematically showing an embodiment of a compressive strength test jig of the present invention.

  According to such a compressive strength test jig, since the movable member and the retainer member are provided, the compressive strength of the honeycomb structure can be measured more accurately. That is, the columnar honeycomb structure may vary in terms of squareness and parallelism and is not accurate. In such a honeycomb structure, when the compressive strength in the cell extending direction is measured, when only the conventional test (test using a universal testing machine) is used (when no jig is used), the honeycomb structure Uneven load was generated on the end surface of the body, and pressure was not uniformly applied. Therefore, the compressive strength of the honeycomb structure may not be measured accurately. However, according to the compressive strength test jig, the conditions closer to the actual use environment can be obtained, so that the compressive strength of the honeycomb structure can be accurately measured.

[1-1] Swivel movable member:
The freely movable member 11 includes a block-shaped piston portion 21, a pressing portion 23 having a pressing plane 23 a, and a movable portion 25 that allows the pressing portion 23 to freely move with respect to the piston portion 21. By providing such a freely movable member 11, the compressive strength test jig 100 can accurately measure the compressive strength of the honeycomb structure 10 (see FIG. 2). That is, when a compressive strength test is performed using a universal testing machine without using the compressive strength test jig of the present invention, an uneven load is generated on the end face of the honeycomb structure whose squareness and parallelism are not accurate. End up. That is, the pressure from the universal testing machine may not be uniformly applied to the honeycomb structure. Here, when the pressure is applied from the universal testing machine 50 (see FIG. 2), the pressing portion 23 of the freely movable member 11 of the compression strength test jig 100 is appropriately moved by the movable portion 25. That is, the direction of the pressing plane 23a of the pressing portion 23 is adjusted so as to be parallel to the end face of the honeycomb structure. In this state, since pressure is applied from the universal testing machine, the above pressure is uniformly applied to the end surface of the honeycomb structure whose squareness and parallelism are not accurate. As a result, the compressive strength of the honeycomb structure can be accurately measured.

  The piston part 21 is a block-like member and is directly applied with pressure from a universal testing machine. The “block shape” can also be referred to as a lump shape, and includes a shape composed of one column, a shape in which two or more columns are connected in series, and the like.

  The piston portion 21 is preferably formed with a flat surface 21a that is in direct contact with the universal testing machine 50 (see FIG. 2).

  The pressing portion is a member having a pressing plane that is a plane that is in contact with the end face of the honeycomb structure and covers the entire end face. The pressing plane is a plane that directly or indirectly contacts the end face of the honeycomb structure. Note that “indirect contact” corresponds to a case where a rubber member described later is disposed on the pressing plane. In this case, the pressing plane is in contact with the end face of the honeycomb structure indirectly through the rubber member.

  The pressing plane is a size that covers the entire end face of the honeycomb structure, and is preferably the same size as the end face and a plane that is in plane contrast with the end face. That is, when the end face of the honeycomb structure is circular, the pressing plane is preferably circular.

  The pressing portion 23 includes an upper surface 23b that is a plane parallel to the pressing plane 23a, and a tapered side surface 23c that is continuous with the upper surface 23b and the pressing plane 23a and has an area of the upper surface 23b that is smaller than the area of the pressing plane 23a. It is preferable. As described above, when the tapered side surface 23c is provided, the pressure applied from the universal testing machine is favorably transmitted to the honeycomb structure, and the compressive strength of the honeycomb structure can be measured more accurately.

  In addition, the thickness of the press part 23 can be about 20-30 mm.

  The movable part 25 is a part that freely moves the pressing part 23 with respect to the piston part 21. "Move the pressing portion 23 freely with respect to the piston portion 21" means that when the piston portion 21 is fixed, the pressing plane 23a of the pressing portion 23 can face in any direction. That is, it can also be said that the movable part includes an X-axis, Y-axis, and Z-axis rotation pair mechanism. Since the pressing portion is freely movable with respect to the piston portion by such a movable portion, even when a honeycomb structure with inaccuracy in squareness or parallelism is used, the pressing plane of the pressing portion is the end surface of the honeycomb structure. It abuts against the end face while fitting in a state (for example, an inclined state). Therefore, the pressure from the universal testing machine is uniformly applied to the end face of the honeycomb structure.

  The movable part 25 is preferably made of a sphere. As described above, when the movable portion made of a sphere is used, the pressing portion 23 can be freely and freely moved with respect to the piston portion 21. In addition, when a movable part consists of a spherical body, it is preferable that the piston part and the press part are formed with the recessed part complementary to the movable part which consists of a spherical body. This is because the mobility of the pressing portion is improved.

  The movable part made of a sphere preferably has a diameter of 10 to 20 mm, more preferably 12 to 18 mm. When the diameter of the movable portion is within the above range, the pressing portion 23 is more freely movable with respect to the piston portion 21, and pressure is uniformly applied to the end face of the honeycomb structure. If the diameter is less than the lower limit value, the movable range becomes small, and the effect of suppressing the bias pressure may be reduced.

  The freely movable member 11 may include a rubber member 27 on the pressing plane 23 a of the pressing portion 23. By further providing the rubber member in this way, it is possible to better prevent the occurrence of an uneven load when pressure is applied to the honeycomb structure.

  The rubber member 27 preferably has a hardness of A30 to A70, more preferably A40 to A65, and particularly preferably A45 to A60. By setting the hardness of the rubber member within the above range, the compressive strength of the honeycomb structure can be accurately measured. If the hardness of the rubber member is less than the lower limit, the compressive strength of the honeycomb structure may not be accurately measured. Further, if it exceeds the above upper limit value, there is a possibility that the effect of disposing a rubber member and preventing the occurrence of an uneven load cannot be sufficiently obtained. This hardness is a value measured by a durometer using durometer hardness.

  The rubber member 27 has a thickness of preferably 2 to 15 mm, more preferably 4 to 12 mm, and particularly preferably 5 to 10 mm. If the thickness of the rubber member is less than the above lower limit value, the rubber member may be disposed and the effect of preventing the occurrence of uneven load may not be sufficiently obtained. Further, if it exceeds the above upper limit value, the compressive strength of the honeycomb structure may not be measured accurately.

[1-2] Retainer member:
The compressive strength test jig 100 includes a retainer member 12 having an annular metal retainer 31 and an annular cushion retainer 33. In the retainer member 12, the inner diameters of the metal retainer 31 and the cushion retainer 33 are each smaller than the diameter of the end face of the honeycomb structure 10 (see FIG. 2). With such a configuration, the honeycomb structure can be brought close to the state accommodated in the can, and the compressive strength of the honeycomb structure can be accurately measured.

  The “annular” can also be referred to as a ring shape, and can also be a shape in which one hole is formed in the center.

  The metal retainer 31 and the cushion retainer 33 shown in FIG. 1 are donut-shaped (ring-shaped) flat plate members having a circular outer peripheral shape.

  The inner diameters of the metal retainer 31 and the cushion retainer 33 of the retainer member 12 are each preferably 6 to 16 mm smaller than the diameter of the other end face of the honeycomb structure 10 (see FIG. 2), and more preferably 8 to 14 mm smaller. When the inner diameter is within the above range, the honeycomb structure can be brought closer to the state accommodated in the can, and the compressive strength of the honeycomb structure can be measured more accurately. If the inner diameter is less than the lower limit, the generated stress increases excessively, so that the influence of suppressing the bias pressure may be reduced (that is, the compressive strength of the honeycomb structure can be measured well). Can be difficult). If the value exceeds the above upper limit value, the generated stress is excessively reduced, and thus the effect of suppressing the bias pressure may be reduced (that is, it becomes difficult to measure the compressive strength of the honeycomb structure well). There is a risk).

  The material of the cushion retainer is not limited, and examples thereof include SUS and SC.

  Each of the metal retainer and the cushion retainer is a flat plate member. And the thickness of a metal retainer can be about 2-10 mm. The thickness of the cushion retainer can be about 2 to 15 mm.

[1-3] Holding stand:
The compressive strength test jig 100 can further include a holding base 41 (see FIG. 2) in which a recess 43 having an opening diameter larger than the opening diameter of the metal retainer 31 is formed. As shown in FIG. 2, the holding base 41 is disposed on the metal retainer 31 side of the retainer member 12 so that the opening 43 a of the recess 43 covers the opening 31 a of the metal retainer 31. In addition, the holding base 41 is such that the opening diameter of the recess is smaller than the outer diameter of the metal retainer 31. By further providing such a holding base 41, the honeycomb structure is actually brought closer to the state of being accommodated in the can, so that the compressive strength of the honeycomb structure can be measured more accurately.

[2] Compressive strength test method:
One embodiment of the compressive strength test method of the present invention will be described with reference to FIG. FIG. 2 is a side view schematically showing an embodiment of the compressive strength test method of the present invention.

  As shown in FIG. 2, the honeycomb retainer 33 and the one end face of the honeycomb structure 10 are in contact with the surface of the cushion retainer 33 of the retainer member 12 in the above-described compression strength test jig 100 of the present invention. The structure 10 is mounted. Further, the movable member 11 is placed on the honeycomb structure 10 so that the other end surface of the honeycomb structure 10 and the pressing plane 23a of the pressing portion 23 of the movable member 11 are in contact with each other. Thereafter, pressure is applied to the honeycomb structure 10 through the freely movable member 11 of the compression strength test jig 100. By doing in this way, the compressive strength of the honeycomb structure 10 in the central axis direction (the cell extending method) can be measured.

  According to such a compressive strength test method, the compressive strength of the honeycomb structure can be measured more accurately because the above-described compressive strength test jig of the present invention is used. That is, in a test method using only a universal testing machine (a test method that does not use the compressive strength test jig of the present invention), an uneven load is generated on the end face of the honeycomb structure, and pressure may not be applied uniformly. . For this reason, the compressive strength of the honeycomb structure may not be accurately measured. However, according to the compressive strength test method of the present invention, the compressive strength of the honeycomb structure can be accurately measured.

  As shown in FIG. 2, the compressive strength test method of the present invention is applied to the honeycomb structure 10 in a state where the holding base 41 is disposed below the retainer member 12 so that the opening of the recess covers the opening of the metal retainer 31. On the other hand, it is preferable to apply pressure via the freely movable member 11. By doing so, the honeycomb structure can be brought close to the state accommodated in the can, and the compressive strength of the honeycomb structure can be measured more accurately.

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

Example 1
First, a columnar honeycomb structure having a porous partition wall for partitioning a plurality of cells extending from one end face to the other end face was prepared. This honeycomb structure has a square cell shape in a cross section perpendicular to the cell extending direction, a partition wall thickness of 25 μm, a cell density of 47 cells / cm ² and an end face diameter of 120 mm. The length in the cell extending direction was 120 mm. Further, the honeycomb structure was made of cordierite as a raw material.

  Next, a jig for compressive strength test according to the present invention was attached to the honeycomb structure (see FIG. 2). This compressive strength test jig is as shown in FIG. 1, and is a freely movable member disposed on one end face side of the honeycomb structure and a retainer member disposed on the other end face side of the honeycomb structure. And had. The freely movable member includes a block-shaped piston portion, a pressing portion having a pressing plane that is in contact with the end surface of the honeycomb structure and covers the entire end surface, and the piston portion and the pressing portion. And a movable part formed of a sphere that is disposed between and moves the pressing part freely with respect to the piston part. The retainer member has an annular metal retainer and an annular cushion retainer disposed on one surface of the metal retainer. The inner diameters of the metal retainer and the cushion retainer of the retainer member were each smaller than the diameter of the end face of the honeycomb structure. Further, a plate-like rubber member (thickness 8 mm, hardness A60) was disposed on the pressing plane of the pressing portion. Furthermore, the retainer member was disposed on a SUS-made holding base in which a concave portion was formed.

  The movable part made of a sphere was made of SUS having a diameter of 15 mm. The pressing portion of the freely movable member has an upper surface that is a plane parallel to the pressing plane, and a tapered side surface that is continuous with the upper surface and the pressing plane and has an area of the upper surface that is smaller than the area of the pressing plane. Furthermore, the inner diameters of the metal retainer and the cushion retainer of the retainer member were each 110 mm, which was 10 mm smaller than the diameter of the end face of the honeycomb structure.

  Next, the load applied to the honeycomb structure in the case of using the compressive strength test jig was simulated. That is, in the compressive strength test, it was confirmed by simulation whether the load applied to the end face of the honeycomb structure (the end face on the side in contact with the retainer member) was uniform. Specifically, the variation in load under different conditions of the perpendicularity and parallelism of the honeycomb structure was obtained by simulation. The perpendicularity and parallelism are those defined in JIS B0621. The results are shown in Table 1.

  As a result of the simulation, it was confirmed that the load applied to the end face of the honeycomb structure (the end face on the side in contact with the retainer member) was uniform in the compressive strength test when the jig for compressive strength test in this example was used. . That is, it was found that the compressive strength test using the compressive strength test jig in this example can measure the compressive strength of the honeycomb structure more accurately.

  Table 1 shows the results when the variation in the load applied to the end face of the honeycomb structure was confirmed by simulation using a compressive strength test jig for the honeycomb structure.

  In the above evaluation, the case where the variation in the load applied to the end face of the honeycomb structure was 10% or less was defined as “A”. The case where the variation in load applied to the end face of the honeycomb structure was more than 10% and 25% or less was defined as “B”. The case where the variation in load applied to the end face of the honeycomb structure was more than 25% was defined as “C”. In the case of “A” or “B”, the degree of variation allowed in the compressive strength is within the allowable range. In the case of “C”, the degree of variation allowed in the compressive strength is outside the allowable range. “Load variation” means the ratio of the maximum value of the difference between the average value of the load applied to the end face of the honeycomb structure and each load to the average value.

(Comparative Example 1)
When the jig for compressive strength test in this example was not used, a load applied to the honeycomb structure was simulated. In this comparative example, a retainer member was used. The results are shown in Table 1.

  As a result of simulation, in this comparative example, in the compressive strength test, it was confirmed that the load applied to the end face of the honeycomb structure (the end face on the side in contact with the retainer member) was not uniform and an uneven load was generated.

  The jig for compressive strength test of the present invention can be used as a jig for measuring the compressive strength of a honeycomb structure. The compressive strength test method of the present invention can be employed as a method for measuring the compressive strength of a honeycomb structure.

10: honeycomb structure, 11: freely movable member, 12: retainer member, 21: piston portion, 21a: flat surface, 23: pressing portion, 23a: pressing flat surface, 23b: top surface, 23c: side surface, 25: movable portion, 27 : Rubber member, 31: Metal retainer, 31a: Opening, 33: Cushion retainer, 41: Holding stand, 43: Recess, 43a: Opening, 50: Universal testing machine, 100: Jig for compressive strength test.

Claims (7)

A jig for testing the compressive strength in the central axis direction in a columnar honeycomb structure having partition walls that partition and form a plurality of cells extending from one end face to the other end face,
A freely movable member disposed on one end face side of the honeycomb structure, and a retainer member disposed on the other end face side of the honeycomb structure,
The freely movable member includes a block-shaped piston portion, a pressing portion having a pressing plane that is in contact with the end surface of the honeycomb structure and covers the entire end surface, the piston portion, and the pressing portion. And a movable part that freely moves the pressing part with respect to the piston part,
The retainer member has an annular metal retainer and an annular cushion retainer disposed on one surface of the metal retainer;
A jig for compressive strength testing, wherein an inner diameter of each of the metal retainer and the cushion retainer of the retainer member is smaller than a diameter of an end face of the honeycomb structure. A holding base having a recess having an opening diameter larger than the opening diameter of the metal retainer;
2. The jig for compressive strength testing according to claim 1, wherein the holding base is disposed on the metal retainer side of the retainer member such that the opening of the concave portion covers the opening of the metal retainer.   The compressive strength according to claim 1 or 2, wherein the movable portion of the freely movable member is formed of a sphere, and the piston portion and the pressing portion are formed with a concave portion complementary to the movable portion formed of a sphere. Test jig.   4. The compressive strength test according to claim 1, wherein inner diameters of the metal retainer and the cushion retainer of the retainer member are 4 to 20 mm smaller than a diameter of the other end surface of the honeycomb structure, respectively. jig.   The pressing portion of the freely movable member has an upper surface that is a plane parallel to the pressing plane, and a tapered side surface that is continuous with the upper surface and the pressing plane, and the area of the upper surface is smaller than the area of the pressing plane. The jig for compressive strength testing according to any one of claims 1 to 4.   The cushion retainer and one end surface of the honeycomb structure are in contact with each other on the surface of the cushion retainer of the retainer member in the compressive strength test jig according to any one of claims 1 to 5. A honeycomb structure is mounted, and the movable member is further mounted on the honeycomb structure so that the other end surface of the honeycomb structure is in contact with the pressing plane of the pressing portion of the movable member. Then, a compressive strength test is performed to measure the compressive strength in the central axis direction of the honeycomb structure by applying pressure to the honeycomb structure via the movable member of the compressive strength test jig. Method.   A holding table in which a recess having an opening diameter larger than the opening diameter of the metal retainer is formed below the retainer member in a state where the opening of the recess of the holding table covers the opening of the metal retainer. The compressive strength test method according to claim 6, wherein pressure is applied to the honeycomb structure through the freely movable member of the compressive strength test jig.

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