Test specimen cutting device and cutting method

Abstract

To cut a test piece simply and easily, efficiently with reduced tact time, and with high accuracy of a dimension.SOLUTION: Provided is a cutting device that cuts a test material 6 set in an elastic layer 50 of a reception table, into a test piece 7 with a punching blade 1 that is pressed against the test material 6 with a drive mechanism. The cutting device includes an outside pusher 2 that presses the test material 6 to be cut against the elastic layer 50. The test material 6 is cut into the test piece 7 in a state where the outside pusher 2 presses the outside of a pair of parallel cutting parts that cut a test region 7X of the test piece 7 to prevent the test material 6 from being displaced.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to an apparatus and method for cutting various test materials into test pieces for use in tensile tests, impact tests, etc.

Background Art

[0002] Materials used for various applications are cut into test pieces as test materials and used in various tests such as tensile tests and impact tests based on JIS. For example, metal plates, metal foils, plastics, rubber-like elastic bodies, laminates of different materials, etc. are cut into dumbbell-shaped or rectangular test pieces and used in various tests. The test pieces to be cut are accurately cut into an outer shape with dimensions conforming to JIS standards and used in tensile tests, etc.

[0003] A cutting device for cutting a test material into a dumbbell-shaped test piece has been developed. (See Patent Document 1) The cutting device described in Patent Document 1 is described as having the following structure in the [Means for Solving the Problem] of the published gazette. A slide base disposed on a base so as to be slidable back and forth, a rotary base disposed on the slide base so as to be rotatable horizontally, a clamp mechanism for fixedly holding a test material to be cut on the rotary base, and a cutter device located above the rotary base and attached to the base for punching the test material, constitute a test piece punching device. The cutter device has a lifting cylinder fixed to the base and having a cylinder rod that can extend and contract downward, and a thin-blade-shaped punching blade attached to the lower end of the cylinder rod and extending in the longitudinal direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The cutting apparatus described in the above publications cuts the test material with a single straight punching blade, requiring separate cutting of both sides of the test piece. To cut a dumbbell-shaped test piece, either the test material or the punching blade must be rotated 180 degrees and cut in two steps, making the cutting apparatus extremely complex and increasing the cycle time, thus hindering efficient mass production. Furthermore, because both sides of the dumbbell shape are cut separately, it is difficult to cut the dumbbell shape with high dimensional accuracy, especially the width which requires high precision. This also requires high precision from the cutting apparatus itself, resulting in significantly high equipment costs.

[0006] Furthermore, conventional cutting devices have the drawback of short lifespan and time-consuming maintenance, such as blade replacement, because the straight punching blades are made from thin steel plates in order to bend them into a shape that cuts one side of a dumbbell. While the lifespan can be extended by making the punching blades thicker, thicker punching blades cause the cutting surface of the blade tip to shift in the width direction of the test piece during cutting, making it impossible to cut to accurate dimensions.

[0007] This invention was developed with the aim of overcoming the above-mentioned drawbacks, and an important objective of this invention is to provide a cutting device and cutting method that can cut test pieces with high dimensional accuracy while shortening the cycle time with a simple structure. [Means for solving the problem]

[0008] A specimen cutting apparatus according to one aspect of the present invention comprises a support base having an elastic layer on its surface, a punching blade for cutting a test material set on the elastic layer of the support base into a specimen with a test area of ​​a constant width (W), a drive mechanism for pressing the tip of the punching blade against the test material to cut it into a specimen, an outer pusher for pressing the test material being cut by the punching blade against the elastic layer, and a pressing mechanism for pressing the outer pusher against the surface of the test material. The punching blade includes a pair of parallel cutting sections for cutting the test area of ​​the specimen, and the outer pusher has a pair of test area pressing sections that press the test material along the outside of the parallel cutting sections. The pressing mechanism comprises a connecting rod and an elastic body. The connecting rod connects the outer pusher to the base plate, and the elastic body is a coil spring mounted on the connecting rod.The cutting device works by having a pressing mechanism press an outer pusher against the surface of the test material, with the test area pressing section pressing the test material on both sides of the outer edges of a pair of parallel cutting sections, and the punching blade cutting the test material, which is set on the elastic layer of the support base, into test pieces.

[0009] A method for cutting a test specimen according to one aspect of the present invention includes a setting step of setting the test material to be cut into a test specimen on an elastic layer on the surface of a support, and a punching step of cutting the test material set on the elastic layer in the setting step into a test specimen with a test area of ​​a certain width (W), wherein in the punching step the test area is cut a pair Having parallel cutting section It is a single-piece cylindrical blade with a single-edged outer blade. The test material is cut with a punching blade, and at the moment the punching blade cuts the test material, The pressing mechanism uses the elastic body of a coil spring arranged on the connecting rod to press the outer pusher against the surface of the test material. The outer edges of both parallel cutting sections of the pair are pressed toward the elastic layer with the test area pressing section of the outer pusher, and the test material is cut into test pieces with a punching blade. [Effects of the Invention]

[0010] The above cutting device and cutting method have the advantage of being able to cut test pieces with high dimensional accuracy while shortening the cycle time with a simple structure. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic front view of a cutting device according to Embodiment 1 of the present invention. [Figure 2] Figure 1 is a front view showing the blade unit of the cutting device. [Figure 3] Figure 2 is a bottom view of the blade unit. [Figure 4] Figure 2 is a vertical cross-sectional view of the cutting tool unit, which corresponds to the cross-sectional view along line IV-IV in Figure 3. [Figure 5] Figure 2 is a vertical cross-sectional view of the blade unit, which corresponds to the VV line cross-section in Figure 3. [Figure 6] This is a vertical cross-sectional view of the cutting tool unit shown in Figure 2, which corresponds to the cross-sectional view along line VI-VI in Figure 3. [Figure 7]It is an enlarged sectional view of the main part showing the state where the outer pusher presses the test material. [Figure 8] It is an enlarged sectional view of the main part showing the state where the punching blade cuts the test material. [Figure 9] It is a perspective view showing an example of a test piece cut by the cutting device of FIG. 1. [Figure 10] It is an enlarged sectional view showing the state of polishing the cutting edge part of the blade unit to process it into a sharp cutting edge. [Figure 11] It is a bottom perspective view showing another example of the blade unit. [Figure 12] It is a schematic front view of the cutting device according to Embodiment 2 of the present invention. [Figure 13] It is an enlarged sectional view of the main part showing the state where the punching blade of the conventional cutting device cuts the sheet material.

Mode for Carrying Out the Invention

[0012] The cutting device for a test piece according to an embodiment of the present invention can have the following configuration. The cutting device of this embodiment includes a receiving base having an elastic layer on its surface, a punching blade that cuts a test material set on the receiving base into a test piece having a constant lateral width (W) in a test area, a driving mechanism that presses the punching blade against the test material to cut it into a test piece, an outer pusher that presses the test material cut by the punching blade against the elastic layer, and a pressing mechanism that presses the outer pusher against the surface of the test material.

[0013] The above cutting device, while having a simple structure, can shorten the tact time for cutting test pieces and cut the test area of the test pieces with high dimensional accuracy. This is because the parallel cutting portion of the punching blade for cutting the test area of the test piece can cut the width (W) of the test area with high dimensional accuracy. The reason why the test area can be cut into the test piece with high accuracy is that when the punching blade cuts the test material, the outer pusher presses the test material to prevent displacement during cutting. The test material that does not shift during cutting will not be drawn inside the pair of parallel cutting portions during cutting. Therefore, the test area of the test piece is cut with high dimensional accuracy equal to the blade tip interval (D) of the pair of parallel cutting portions. Since the error in the width (W) of the test area causes a decrease in the accuracy of the tensile strength of the test piece, the above device that can cut the width (W) of the test area with high accuracy realizes the feature of being able to measure the tensile strength of the test piece with high precision using a testing machine.

[0014] Furthermore, the test pieces cut by the above cutting device can also suppress changes in physical properties due to residual stress on both sides of the test area. Since the residual stress in the test area causes measurement errors in the tensile test of the test piece, the test piece cut while suppressing the residual stress has the feature of being able to accurately measure the tensile strength.

[0015] Figure 13 is an enlarged cross-sectional view showing the state in which the test material 96 to be cut by the punching blade 91 is pulled inward by the pair of parallel cutting sections 91X when the test piece 97 is cut. Figures 7 and 8 are enlarged cross-sectional views showing the state in which the test material 6 is pressed and cut by the outer pusher 2. The test material that is not pressed by the outer pusher is pulled inward by the pair of parallel cutting sections 91X just before the cutting edge 92 cuts the test material 96, as shown in Figure 13, and deforms so as to protrude upward inside the cutting edge 92. The punching blade 91 starts cutting when the contact pressure of the cutting edge 92 pressing against the surface of the test material 96 exceeds the limit pressure at which cutting is possible. The cutting edge 92 descends to a position where the contact pressure exceeds the limit pressure and starts cutting, and at this timing the elastic layer 94 of the support base 95 is pressed by the cutting edge 92 and undergoes elastic deformation. The elastically deformed elastic layer 94 presses the surface of the test material 96 against the cutting edge 92, increasing the contact pressure between the cutting edge 92 and the test material 96. After the cutting edge contacts the surface of the test material, the elastic restoring force of the elastic layer pushes up the test material in the inner region of the punching tool until the contact pressure increases to the limit pressure. The upward force of the elastic layer increases as the cutting edge descends until it reaches the limit pressure. The gradually increasing upward force causes the cutting edge to slide against the surface of the test material, moving the test material 96 inside the punching tool 91, as shown by arrow A in Figure 13, causing it to protrude inside the punching tool 91. The protruding test material 96 curves with a small radius of curvature inside the cutting edge 92, causing its central portion to protrude. The test piece 97 that is cut in this deformed shape has a substantial width (W') of the test area that is wider than the distance (D) between the cutting edges of the pair of parallel cutting sections. Therefore, the cut test piece has a wider width in the test area and reduced dimensional accuracy. Furthermore, because the material is cut in a protruding shape, residual stress is generated on both sides of the test area, which is curved with a small radius of curvature. In addition, test materials that deform but do not return to their original shape, such as metal plates, cannot maintain a flat surface on both sides of the test area after cutting, and the curved shape remains.

[0016] As shown in Figure 7, the test material, pressed and cut by the outer pusher, is cut without moving inside the parallel cutting section 1X because the outer pusher 2 prevents displacement of the test material 6. The test material 6, which does not displacement inward, has a test area 7X width (W) equal to the distance (D) between the cutting edges of the pair of parallel cutting sections 1X (see Figure 8). Furthermore, the test material 6, which does not displacement, suppresses the protrusion of the elastic layer 50 inside the parallel cutting section 1X with its own tension T. The test piece 7, which is cut between the parallel cutting sections 1X without deforming into a protruding shape, suppresses residual stress that occurs when both sides of the test area 7X are curved.

[0017] Figure 13 shows an enlarged cross-sectional view of the test material being cut into a test piece without being pressed by the outer pusher. This figure shows the state in which the test material 96, placed on a support 95 with an elastic layer 94 on its surface, is being cut by a punching blade 91. Furthermore, this figure shows the state just before the punching blade 91 begins cutting the test material 96. The punching blade 91 does not begin cutting from the moment the cutting edge 92 contacts the surface of the test material 96.

[0018] Furthermore, when test materials such as metal plates that deform but do not return to their original shape are cut in the state shown in Figure 13, a problem arises where both side edges of the cut test piece are curved, preventing a flat cut. Moreover, when test materials are cut by increasing the contact pressure of the cutting edge to the limit pressure, the test piece is cut with a small radius of curvature on both sides at the limit pressure. This results in residual stress in this region, which causes a change in the physical properties of the cut test piece. Since residual stress affects strength, residual stress on both side edges can cause measurement errors in tensile tests and other measurements of the test piece.

[0019] In contrast, the cutting device of the present invention is equipped with an outer pusher that has a pair of test area pressing sections that press the test material along the outside of a pair of parallel cutting sections in which the punching blade cuts the test area of ​​the test piece. As shown in Figure 7, prior to the punching blade 1 cutting, the cutting device presses the areas on both sides of the pair of parallel cutting sections 1X with the pair of test area pressing sections 2X, so that the test material 6 is held in place on both sides without shifting position, keeping the test material 6 taut in both directions, and in this state the punching blade 1 can cut, so that the width (W) of the test area can be cut with high dimensional accuracy.

[0020] In another embodiment of the present invention, a cutting device can cut a test material into a dumbbell-shaped test piece with a punching blade, with the central part being the test area.

[0021] The cutting device described above has the advantage of being able to cut the test area of ​​a dumbbell-shaped test specimen with extremely high dimensional accuracy, especially in the width of the test area. Since errors in the width of the test area can reduce the accuracy of tensile strength measurements, a cutting device that can cut the width of the test area with high accuracy can achieve the advantage of being able to measure the tensile strength of the test specimen with high precision.

[0022] In another embodiment of the present invention, the cutting apparatus can have a flat surface on the test area pressing section that presses the test material against the elastic layer, which is in surface contact with the surface of the test material.

[0023] In the above cutting device, the test area pressing section of the outer pusher uses a flat pressing surface to press the surface of the test material against the elastic layer on the surface of the support base in a surface contact state, thereby preventing displacement of the test material. As a result, the test area pressing section holds the test material in a flat position and makes contact over a wide area, effectively preventing displacement and enabling cutting of the width (W) of the test area with high dimensional accuracy.

[0024] In another embodiment of the present invention, the cutting device uses a single-edged outer blade for the punching blade, and a guide gap can be provided between the outer pusher and the outer surface of the parallel cutting portion of the punching blade, allowing the punching blade and the outer pusher to reciprocate relative to each other.

[0025] In another embodiment of the present invention, the cutting device can have a guide gap of 0.1 mm or more and 5 mm or less.

[0026] In another embodiment of the present invention, the cutting apparatus can have a rubber-like elastic material for the elastic layer of the support base.

[0027] In another embodiment of the present invention, the cutting apparatus comprises a punching blade drive mechanism comprising upper and lower bases on which the punching blade is fixed, and an upper and lower mechanism for reciprocating the upper and lower bases, and an outer pusher pressing mechanism comprising an elastic body that elastically presses the outer pusher from the upper and lower bases, and a stopper mechanism that identifies the extrusion position from which the outer pusher is pushed out from the upper and lower bases, wherein the extrusion position of the stopper mechanism can be set to a position that protrudes beyond the cutting edge surface of the punching blade.

[0028] In the above cutting device, the outer pusher is positioned to protrude beyond the cutting edge of the punching blade using an elastic material when the punching blade is not cutting the test material. This protects the cutting edge of the punching blade by covering it with the outer pusher, and also prevents the operator from accidentally touching the cutting edge, ensuring safe use.

[0029] A method for cutting a test piece according to one embodiment of the present invention includes a setting step of setting the test material to be cut into a test piece on an elastic layer on the surface of a support, and a punching step of cutting the test material set on the elastic layer in the setting step into a test piece with a test area of ​​a certain width (W), wherein in the punching step, the test material is cut with a punching blade having parallel cutting sections that cut the test area, and at the timing when the punching blade cuts the test material, the outer sides of both of the pair of parallel cutting sections are pressed toward the elastic layer with the test area pressing section of an outer pusher, and the test material is cut into a test piece by the punching blade.

[0030] The above cutting method has the advantage of being able to cut the width (W) of the test area of ​​the test piece with high dimensional accuracy. This is because, at the moment the punching blade cuts the test material, the outside of both of the pair of parallel cutting sections is pressed toward the elastic layer by the test area pressing section of the outer pusher, and the punching blade cuts the test material into a test piece. In this cutting method, the outer pusher's test area pressing section presses the test material on both sides of the pair of parallel cutting sections while the test material is cut with a punching blade. This prevents misalignment during cutting and allows for cutting of the test area width (W) with high dimensional accuracy.

[0031] In another embodiment of the present invention, a cutting method is used in the punching step, in which a single-edged punching blade with an outer blade surface is used, and a guide gap is provided between the outer surface of the punching blade and the test area pressing portion, and the test material can be cut with a guide gap of 0.1 mm or more and 5 mm or less.

[0032] In another embodiment of the present invention, the cutting method allows the punching tool to cut the test material into a dumbbell-shaped test piece with the central part as the test area during the punching process.

[0033] The cutting apparatus and cutting method according to embodiments of the present invention will be described in more detail below with reference to the drawings. In the following description, terms indicating specific directions or positions (for example, "up," "down," and other terms including these terms) will be used as needed. The use of these terms is for the purpose of facilitating the understanding of the invention by referring to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Also, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or components. Furthermore, the embodiments shown below are concrete examples of the technical concept of the present invention and do not limit the present invention to the following. In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are intended to be illustrative, and not to limit the scope of the present invention unless specifically stated otherwise. Furthermore, the content described in one embodiment or example is applicable to other embodiments and examples. Also, the size and positional relationships of the components shown in the drawings may be exaggerated to clarify the explanation.

[0034] (Embodiment 1) The cutting device 100 for cutting the test material into test pieces, as shown in Figures 1 to 8, comprises a support base 5 on which the test material 6 is placed and cut, with an elastic layer 50 on the surface; a punching blade 1 that reciprocates toward the support base 5 to cut the test material 6 into test pieces 7; a drive mechanism 4 that moves the punching blade 1 toward the surface of the support base 5; an outer pusher 2 that presses the test material 6 being cut by the punching blade 1 against the elastic layer 50 of the support base 5 on the outside of the punching blade 1; and a pressing mechanism 8 that presses the outer pusher 2 against the test material 6.

[0035] (Test material 6) The cutting apparatus and cutting method of the present invention do not specify the material, thickness, shape, etc., of the test material 6 to be cut, but for example, it can be plastic, rubber-like elastic material, metal plate, or laminate of dissimilar materials, with a thickness of 1 mm or less, a sheet of 1 to 3 mm, or a plate of 3 to 50 mm. However, the present invention does not specify the test material to be cut, and can be used with test materials of all materials and thicknesses used in tensile tests, etc. The purpose of the present invention is to cut various test materials with high dimensional accuracy and prevent local residual stress and strain in the cut test piece, and therefore mainly cuts test materials of flexible materials, but even inorganic test materials that are almost inflexible, such as ceramics, can be cut without damage, so the test material is not limited to a flexible material.

[0036] (Test piece 7) The following is a specific example of cutting the test material into a dumbbell-shaped test piece, but the present invention is not limited to the shape of the test piece being dumbbell-shaped. The test piece 7 shown in Figure 9 is used for tensile testing of the material by gripping both ends, so a test area 7X with a certain width (W) is provided between the chucking portions 7Y at both ends. Since test specimen 7 measures tensile forces and other forces acting on the test area 7X, high dimensional accuracy is required for the test area 7X. Since the strength of the test area 7X is measured by gripping the chucking portion 7Y of the test specimen 7 with the testing machine, a test specimen 7 with a narrow width (W) has wide chucking portions 7Y at both ends, giving the whole specimen a dumbbell shape. A test specimen with a wide test area that can be chucked has a rectangular shape overall, with chucking portions at both ends that are the same width as the test area.

[0037] (Support stand 5) The support base 5 is made of metal, with an elastic layer 50 on its surface and a smooth, flat top surface, and is positioned horizontally. However, while the support base 5 preferably has an elastic layer 50 on its surface, it can also be made entirely of elastic material. As shown in Figure 1, the metal support base 5 has an elastic layer 50 laminated on the cutting surface of its top surface. During cutting, the elastic layer 50 bites into the cutting edge 10 of the punching blade 1 as it passes through the test material 6, preventing damage to the cutting edge 10 of the punching blade 1 and completely separating and cutting the test piece. The elastic layer 50 is preferably an elastic material with a thickness of 5 to 30 mm. The support base 5 with an elastic layer 50 on its surface can completely separate the test piece from the test material with a punching blade 1 whose cutting edges 10 are not perfectly aligned on the same plane. The punching blade 1 is manufactured by grinding the tip so that the cutting edges 10 are on the same plane, but grinding to an ideal cutting edge shape while perfectly aligning the cutting edges 10 on the same plane requires extremely high processing precision. This is because, in the case of a single-edged punching tool 1, the surface of the tip that becomes the cutting edge 10 is polished to create a sharp cutting edge 10, but it is extremely difficult to machine the cutting edge 10 to be on the same plane while providing a sharp cutting edge 10.

[0038] The cross-sectional view in Figure 10 shows the process of grinding the coplanar cutting edge portion 15 to create an outer cutting surface 11 and process it into a sharp cutting edge 10. In this figure, solid line A represents the ideal processing line. Solid line A creates a sharp cutting edge 10 without grinding the tip surface, but in actual processing, grinding along solid line A is practically impossible. In particular, it is not possible to create a sharp cutting edge 10 by grinding the entire linearly extending cutting edge 10 in the state of solid line A. To create a sharp cutting edge 10, it is necessary to grind the tip edge slightly, as shown by the dashed line B, but grinding to this position has the drawback of causing the cutting edge 10 to shift from the position where it was processed on the same plane. The cutting edge 10 can be ground to the position of the dashed line C to place the cutting edge 10 on the same plane, but grinding to this position does not produce a sharp cutting edge 10. As described above, providing a sharp cutting edge 10 and arranging the cutting edges 10 on the same plane are mutually exclusive, making it extremely difficult to satisfy both. In particular, since the punching tool 1 needs to be machined to have a sharp cutting edge 10 in order to reliably cut the test material, arranging the cutting edges 10 on the same plane is not practical.

[0039] The support base 5, with its surface made of an elastic layer 50, can reliably separate the test piece 7 from the test material 6 using a punching blade 1 whose cutting edge 10 is not on the same plane. This is because a portion of the cutting edge 10, which is not on the same plane, can bite into the elastic layer 50, thereby cutting the test material 6. The elastic layer 50 is made of a rubber-like elastic material that has the properties to bite inward from the surface without damaging the cutting edge 10, and to maintain the test material in a planar state, thereby reliably separating the test piece 7 with the punching blade 1.

[0040] The receiving base 5, whose surface is made of the aforementioned elastic layer 50, allows the test piece 7 to be cleanly cut and separated from the test material 6 by bringing the cutting edge 10 of the punching blade 1 into close contact with the elastic layer 50, or by digging the cutting edge 10 of the punching blade 1 into the surface of the elastic layer 50, while the test material 6 is being punched out with the punching blade 1. However, the rubbery elastic material of the elastic layer 50 can be natural or synthetic rubber or plastic elastomer.

[0041] (Punching tool 1) As shown in Figures 2 to 8, the punching tool 1 is cylindrical in shape, with a cutting edge 10 at its lower edge cutting the test material 6 into test pieces 7, and is preferably made from a metal plate with a thickness of 2 mm or more. The punching tool 1 is made from a steel material that can be hardened, but preferably, carbon steel with excellent workability is suitable. The carbon content of the carbon steel is adjusted to an optimal value considering the required hardness and brittleness. The metal plate of the punching tool 1 can be made harder by increasing the carbon content. However, if the carbon content is high, it becomes brittle, so the carbon content of the steel material processed into the tool should be, for example, 0.4% or more and 1.4% or less, preferably 0.45% or more and 0.7% or less.

[0042] The punching blade 1 is provided with a pair of parallel cutting sections 1X in the part that cuts the test area 7X of the test piece 7. The punching blade 1 processes the spacing (D) of the blade tips of the parallel cutting sections 1X with high dimensional accuracy to cut the test area 7X of the test piece 7 to the correct width (W). The punching blade 1 for cutting the dumbbell-shaped test piece 7 is provided with end cutting sections 1Y for cutting the chucking section 7Y at both ends of the parallel cutting section 1X that cuts the test area 7X. Since the width of the dumbbell-shaped test piece 7 gradually widens from the test area 7X towards the chucking section 7Y, the punching blade 1 gradually widens the spacing (D) of the blade tips from the parallel cutting section 1X towards the end cutting section 1Y. The cylindrical punching blade 1 can cut and separate the test piece 7 from the test material 6. This punching tool 1 connects the edges of the end cutting sections 1Y on both sides with the cutting edge 10.

[0043] As shown in the enlarged cross-sectional views of Figures 7 and 8, the punching tool 1 is formed by grinding the tip of a cylindrical metal plate with a grinding wheel or file to create a single-edged cutting edge 10. The single-edged cutting edge 10 has an outer cutting surface 11 formed by grinding the outer circumferential surface of the lower end of the cylindrical metal plate. The punching tool 1 can also have a modified cutting surface formed by grinding and polishing the inner circumferential surface of the single-edged cutting edge. The punching tool 1 is a single-edged cutting edge with only the outer cutting surface 11, or a single-edged cutting edge with a slightly modified cutting surface on the inside, with the tip edge serving as the cutting edge 10, and the test material 6 is cut into test pieces 7 with the cutting edge 10.

[0044] In punching tools with a corrected cutting surface on the inside (not shown in the diagram), the single-edged cutting edge is unevenly distributed from the inner surface of the cylindrical body to the outside. This cutting edge adjusts the uneven distribution distance, which is the distance between the inner surface of the cylindrical body and the cutting edge, and the single-edged distance, which is the distance between the outer surface of the cylindrical body and the cutting edge. In punching tools with a corrected cutting surface, the uneven distribution distance is set so that when cutting thick test material, the width (W) of the test area of ​​the test piece is cut to an accurate dimension without change in the thickness direction. In punching tools that cut dumbbell-shaped test pieces, a corrected cutting surface is provided in the parallel cutting section, and the uneven distribution distance of the cutting edge in the parallel cutting section is set so that the width (W) of the test area to be cut is cut to an accurate dimension without shifting in the thickness direction.

[0045] (Drive mechanism 4) As shown in Figure 1, the drive mechanism 4 reciprocates the punching blade 1 vertically to cut the test material 6 placed on the elastic layer 50 of the support base 5 and punch out a test piece 7. The drive mechanism 4 includes an upper and lower base 41 to which the punching blade 1 is fixed, and a cylinder 42 that reciprocates the upper and lower base 41 up and down. The punching blade 1 is connected vertically to the lower surface of the upper and lower base 41, and the cylinder 42 reciprocates the upper and lower base 41 up and down to punch out the test material 6 set on the support base 5 into a test piece 7. In the process in which the punching blade 1 cuts the test material 6, the outer pusher 2 presses the surface of the test material 6 against the elastic layer 50, as shown in Figures 7 and 8.

[0046] The drive mechanism 4 of the cutting device 100 shown in Figure 1 has a cylinder 42 that extends and retracts a rod 42a, positioned vertically with the rod 42a facing downwards, and the lower end of the rod 42a is connected to the center of the upper and lower tables 41. Furthermore, the drive mechanism 4 is equipped with a pair of guide mechanisms 43 facing each other at both ends of the upper and lower tables 41, with a guide rod 43a inserted through a guide cylinder portion 43b and positioned vertically, and the lower ends of the guide rod 43a being connected to both ends of the upper and lower tables 41. With the cylinder 42 extending and retracting the rod 42a, the drive mechanism 4 reciprocates up and down while holding the upper and lower tables 41 in a horizontal position.

[0047] The upper and lower base 41 comprises a base plate 30 connecting the punching blade 1 and the outer pusher 2, and a main body 45 that detachably connects to the base plate 30. The base plate 30 is a flat metal plate, and as shown in Figures 2 and 4, a connecting part 31 that detachably connects to the main body 45 is fixed to the upper surface, connecting the punching blade 1 and the outer pusher 2 to the lower surface. The punching blade 1 is fixed to the base plate 30 by welding, and the outer pusher 2 is connected to the base plate 30 via the elastic body 20 of the pressing mechanism 8. This structure allows the punching blade 1 and the outer pusher 2 to be connected to the base plate 30 as a blade unit 3, making it convenient to replace.

[0048] (Blade unit 3) The cutting device 100 shown in Figures 2 to 6 connects a punching blade 1 and an outer pusher 2 to a base plate 30 to form a blade unit 3, and detachably connects the blade unit 3 to the main body 45 of an upper and lower table 41 which is moved up and down by a cylinder 42. Figure 2 is a front view of the blade unit 3, Figure 3 is a bottom view of the blade unit, Figure 4 is a vertical cross-sectional view of the blade unit, Figure 5 is a cross-sectional view of the blade unit in the central test area 7X of the test piece 7, and Figure 6 is a cross-sectional view of the blade unit in the chucking area 7Y at the end of the test piece 7. The blade unit 3 shown in these figures comprises a base plate 30 with a connecting part 31 fixed to its upper surface, a cylindrical punching blade 1 fixed to the lower surface of the base plate 30, and an outer pusher 2 arranged to reciprocate relative to the outside of the cylindrical outer surface 13 of the punching blade 1. The outer pusher 2 is connected to the base plate 30 via an elastic body 20, causing the outer pusher 2 to elastically protrude from the cutting edge 10 of the punching tool 1.

[0049] (Outer pusher 2) The outer pusher 2 presses the test material 6 against the elastic layer 50 of the support base 5 to prevent displacement of the test material 6 at the moment the punching blade 1 cuts the test material 6. The test material 6 being cut by the punching blade 1 is subjected to a displacement force that moves it inward from the punching blade 1 at the moment of cutting. This is because the elastic layer 50, which protrudes from the inside of the pair of parallel cutting sections 1X provided on the punching blade 1, pushes up the test material 6. Displacement of the test material 6 reduces the dimensional accuracy of the width (W) of the test area 7X of the test piece 7 being cut. The outer pusher 2 has a pair of test area pressing sections 2X that press the test material 6 along the outside of the parallel cutting section 1X. The pair of test area pressing sections 2X of the outer pusher 2 press the surface of the test material 6 against the elastic layer 50 on both sides of the outside of the pair of parallel cutting sections 1X, preventing displacement during cutting and preventing a decrease in the dimensional accuracy of the test area 7X. At the moment the punching blade 1 cuts the test material 6, the outer pusher 2 prevents the test material 6 from shifting position, thus pressing the surface of the test material 6 against the elastic layer 50 with a pressing force that prevents the test material 6 from shifting position. In the outer region of the parallel cutting section 1X, the test material 6, whose upper surface is pressed against the elastic layer 50 by the outer pusher 2, is prevented from shifting position by the frictional resistance between the surface of the outer pusher 2 and the surface of the elastic layer 50. Since the frictional resistance increases in proportion to the product of the surface friction coefficient and the pressing force, the force with which the outer pusher 2 presses the test material 6 is set to a pressing force that prevents the test material 6, which is cut by the punching blade 1, from shifting position due to frictional resistance.

[0050] The outer pusher 2 presses the surface of the test material 6 to be cut with its flat pressing surface 2a. The outer pusher 2 is connected to the base plate 30 so as to be able to reciprocate in the vertical direction. The base plate 30 presses the outer pusher 2 against the surface of the test material 6 via the elastic body 20. Since the outer pusher 2 presses the surface of the test material 6 with the elastic restoring force of the elastic body 20, the pressing force of the outer pusher 2 can be adjusted by the spring constant of the elastic body 20. By increasing the spring constant of the elastic body 20, the pressing force of the outer pusher 2 can be increased. Also, since the elastic restoring force of the elastic body 20 increases in proportion to the amount of deformation, the amount of deformation of the elastic body 20 when the outer pusher 2 is pressing against the surface of the test material 6 can be increased, thereby increasing the pressing force on the test material 6. The outer pusher 2 prevents misalignment of the test material 6 at the moment the cutting edge 10 of the punching blade 1 begins cutting the test material 6. By considering the amount of deformation of the elastic body 20 at the moment the cutting edge 10 begins cutting the test material 6, the spring constant of the elastic body 20 can be set to an optimal value to prevent misalignment of the test material 6.

[0051] The outer pusher 2 shown in Figures 2 to 6 is a frame-shaped structure that positions the punching blade 1 inside, and its inner shape follows the cylindrical outer surface 13 of the punching blade 1, specifically, it is slightly larger than the outer shape of the punching blade 1 that cuts the test piece 7. The outer pusher 2 has a pressing surface 2a on its lower surface, is located outside the punching blade 1, and reciprocates in the vertical direction relative to the punching blade 1. The outer pusher 2 is pushed out by the elastic body 20 when the cutting edge 10 of the punching blade 1 does not come into contact with the surface of the test material 6, so that the pressing surface 2a protrudes from the cutting edge 10 of the punching blade 1. In addition, a guide gap 34 is provided between the inner surface of the outer pusher 2 and the outer surface of the punching blade 1 to allow the outer pusher 2 to reciprocate relative to the punching blade 1.

[0052] The frame-shaped outer pusher 2 connects a pair of vertical frames 2m and a pair of horizontal frames 2n at right angles. The vertical frames 2m on both sides have a wider width in the area facing the parallel cutting section 1X of the punching blade 1, and the inner surface of this section is brought close to the outer surface of the parallel cutting section 1X to form a pair of test area pressing sections 2X. The horizontal frames 2n at both ends have equal width. The outer pusher 2 has a rectangular shape and curved corners to improve safety. Similarly, the base plate 30 also has a rectangular shape and curved corners to improve safety. The blade unit 3 shown in the figure has an outer shape that is approximately the same as that of the base plate 30 and the outer pusher 2.

[0053] The outer pusher 2 shown in Figure 3 has an inner shape that conforms to the cylindrical outer surface 13 of the punching blade 1, and a guide gap 34 is provided between it and the outer surface of the punching blade 1. The outer pusher 2 can effectively prevent displacement of the test material 6 in the area to be cut in the test area 7X by narrowing the guide gap 34 between it and the parallel cutting section 1X of the punching blade 1. Therefore, the guide gap 34 between the outer pusher 2 and the parallel cutting section 1X is set to, for example, 5 mm or less, preferably 3 mm or less, and more preferably 2 mm or less. If the guide gap 34 is too narrow, the punching blade 1 and the outer pusher 2 will come into contact, hindering their smooth relative movement in the vertical direction. Therefore, the guide gap 34 between the parallel cutting section 1X and the outer pusher 2 is set to, for example, 0.1 mm or more, preferably 0.2 mm or more, and more preferably 0.5 mm or more. The outer pusher 2 approaches the outside of the parallel cutting section 1X of the punching blade 1, and presses against the surface of the test material 6 in the area close to the outside of the parallel cutting section 1X, allowing the outer pusher 2 to cut the width of the test area 7X with high dimensional accuracy.

[0054] The outer pusher 2 can be made of, for example, a plastic sheet or a metal sheet. For a plastic outer pusher 2, for example, a sheet material made by molding engineering plastic to a predetermined thickness can be used. As such a plastic sheet, high-strength and versatile nylon, such as MC nylon, can be used. However, other plastics can also be used. In particular, by using a plastic outer pusher 2, the overall thickness can be increased while keeping the weight down. In addition, the thickly molded outer pusher 2 can reliably cover the cutting edge 10 of the punching blade 1 while elastically protruding from it, thus preventing the operator from touching the cutting edge 10 and ensuring safe use. The plastic outer pusher 2 can be made with a thickness of 5 mm to 20 mm, preferably 8 mm to 15 mm, taking into account the amount of protrusion from the cutting edge 10, thereby ensuring strength and improving safety.

[0055] The outer pusher 2 is connected to the base plate 30 which fixes the punching blade 1, and moves up and down together with the punching blade 1. The punching blade 1 is fixed to the base plate 30, and the outer pusher 2 is connected to the base plate 30 so that it can move up and down, forming a blade unit 3 with the punching blade 1, base plate 30, and outer pusher 2. The outer pusher 2 is connected to the base plate 30 via a pressing mechanism 8 consisting of a connecting rod 23 and an elastic body 20. The elastic body 20 is compressed to press the outer pusher 2 against the surface of the test material 6. The connecting rod 23 connects both ends and both sides of the outer pusher 2 to the base plate, causing the outer pusher 2 to move up and down in a horizontal position. As shown in Figure 3, by connecting the outer pusher 2 to the base plate 30 at four points (front, back, left, and right) with the connecting rod 23, the outer pusher 2 can move up and down stably in a horizontal position without wobbling.

[0056] (Pressing mechanism 8) The pressing mechanism 8 that presses the outer pusher 2 against the surface of the test material 6 comprises a connecting rod 23 and an elastic body 20. The lower end of the connecting rod 23 is fixed to the outer pusher 2, and the upper end is inserted reciprocally into a through hole 30a of the base plate 30. The connecting rod 23 has a stopper mechanism 24 at its upper end, which contacts the upper surface of the base plate 30 to determine the protruding position of the outer pusher 2 from the cutting edge 10. The protruding position of the outer pusher 2 is set to, for example, about 2 mm or more and 10 mm or less from the cutting edge 10, preferably 3 mm or more and 8 mm or less.

[0057] The connecting rod 23 has a threaded portion 23a at its tip, and the stopper mechanism 24 is screwed into the threaded portion 23a as a nut 24a, connecting the outer pusher 2 to the base plate 30 with a simple structure, and further allowing the protruding position to be easily adjusted to the optimal position. The threaded portion 23a of the connecting rod 23 can be inserted from bottom to top into the insertion hole 25 provided in the outer pusher 2. The threaded portion 23a of the connecting rod 23 is guided into the recess 26 on the lower surface of the outer pusher 2 so that the screw head 23b does not protrude from the lower surface of the outer pusher 2. The nut 24a of the stopper mechanism 24 is screwed into the threaded portion 23a of the connecting rod 23 that protrudes from the base plate 30. The stopper mechanism 24 can be made into a double nut by screwing in multiple nuts 24a, creating a structure that does not shift position during reciprocating motion. This connecting rod 23 can adjust the screw-in position of the nut 24a to set the protruding position from the cutting edge 10 of the outer pusher 2 to the optimal value.

[0058] (Elastic body 20) The elastic body 20 is a compression spring coil spring 20a, and a connecting rod 23 is inserted to prevent misalignment, and it is positioned between the base plate 30 and the outer pusher 2. The elastic body 20 is a compression spring coil spring 20a that elastically pushes the outer pusher 2 from the cutting edge 10. The coil spring 20a of the elastic body 20 is positioned between the outer pusher 2 and the base plate 30 in a compressed state. The elastic body 20 can have a high spring constant to increase the pressure applied by the outer pusher 2 to the test material 6. For example, when the outer pusher 2 is pressurizing and cutting the test material 6, the pressure applied to the surface of the test material 6 can be set to an optimal value by adjusting the spring constant of the elastic body 20 and the position at which the stopper mechanism 24 compresses the elastic body 20.

[0059] (Another example of an external pusher 2) The outer pusher 2 described above has a frame-shaped base and is constructed by connecting a pair of vertical frames 2m and a pair of horizontal frames 2n at right angles. However, the outer pusher does not necessarily have to be frame-shaped; it can also be arranged on both sides of the punching blade 1 as a pair of outer pushers 2 along the outside of a pair of parallel cutting sections 1X. The blade unit 3 shown in Figure 11 fixes the punching blade 1 to a base plate 30 and arranges a pair of outer pushers 2 on both sides of the punching blade 1. Each outer pusher 2 is provided with a test area pressing section 2X in the area facing the parallel cutting section 1X. That is, the blade unit 3 shown in the figure is provided with a pair of outer pushers 2 on both sides of the punching blade 1 and a pair of test area pressing sections 2X along the outside of a pair of parallel cutting sections 1X. In the diagram, the outer pusher 2 has a wider test area pressing section 2X that faces the parallel cutting section 1X, bringing the inner surface of this section closer to the outer surface of the parallel cutting section 1X.

[0060] A pair of outer pushers 2 are connected to a base plate 30 via a pressing mechanism 8. The blade unit 3 in Figure 11 is connected to the base plate 30 via a pressing mechanism 8 so that each outer pusher 2 can independently press the surface of the test material 6. The blade unit 3 in the figure connects each outer pusher 2 to the base plate 30 at three points: left, right, and middle, via connecting rods 23, and elastically presses the outer pushers 2 via coil springs 20a inserted through each connecting rod 23. The connecting rods 23 that connect the left, right, and middle points of the outer pushers 2 are positioned at the vertices of a triangle in a bottom view, allowing the outer pushers 2 to reciprocate stably in a horizontal position without wobbling. However, although not shown, the pair of outer pushers can also be positioned on opposite sides of the punching blade via a frame-shaped moving plate that is positioned along the outside of the punching blade. This structure connects a frame-shaped movable plate to a base plate via multiple connecting rods, thereby integrating the frame and a pair of outer pushers into a single structure that can be moved parallel to the outer circumference of the punching tool.

[0061] In the blade unit 3 with the above structure, the outer pushers 2 on both sides are positioned so that they are pushed out by the pressing mechanism 8 toward the tip of the punching blade 1. When cutting the test material with the punching blade 1, the outer pushers 2 on both sides of the blade unit 3 also press against the surface of the test material prior to the cutting edge 10 of the punching blade 1. The test material is punched out by the punching blade 1 with high dimensional accuracy while the areas on both sides of the pair of parallel cutting sections 1X are pressed by the pair of test area pressing sections 2X.

[0062] The cutting device 100 described above punches out the test material 6 and cuts it into test pieces 7 in the following steps. (1) The cylinder 42 is used to position the upper and lower bases 41 in the raised position and connect the blade unit 3 to the upper and lower bases 41. (2) Place the test material 6 on the elastic layer 50 of the support base 5. (3) The cylinder 42 lowers the upper and lower platforms 41. (4) As the upper and lower tables 41 descend, the outer pusher 2 contacts the surface of the test material 6 outside the pair of parallel cutting sections 1X when the cutting edge 10 of the punching blade 1 approaches the test material 6, as shown in Figure 7. If the upper and lower platforms 41 are lowered further in this state, the elastic body 20 will be compressed, and the outer pusher 2 will press the test material 6 against the elastic layer 50. The outer pusher 2 presses the surface of the test material 6 against the elastic layer 50 with pressure that prevents displacement of the test material 6, while the cutting edge 10 of the punching blade 1 is cutting the test material 6. (5) In this state, when the upper and lower tables 41 are lowered further, the cutting edge 10 of the punching blade 1 moves vertically to cut the test material 6, as shown in Figure 8. At this time, the outer pusher 2 presses down on the test material 6 to hold it in a position where it will not shift. The cutting edge 10 cuts the test material 6, which has not shifted position, and cuts the test piece 7 to the exact width (W) of the test area 7X.

[0063] (Embodiment 2) The cutting device of this embodiment cuts the test material into test pieces using the same mechanism as in Embodiment 1, except that the punching blade and the outer pusher are driven by separate drive mechanisms. In the cutting device 200 of this embodiment, as shown in Figure 12, the drive mechanism 4 for the punching blade 1 and the pressing mechanism 8 for the outer pusher 2 move up and down independently, causing the punching blade 1 and the outer pusher 2 to move up and down. As shown in Figure 7, the pressing mechanism 8 for the outer pusher 2 presses the outer pusher 2 against the surface of the test material 6, holding the test material 6 in a position where it does not shift. With the pressing mechanism 8 holding the outer pusher 2 in this position, the drive mechanism 4 lowers the punching blade 1 to the position shown in Figure 8, cutting the test material 6 into test pieces 7. Since the outer pusher 2 prevents the test material 6 from shifting position, the punching blade 1 cuts the test piece 7 so that the width of the test area 7X is precisely equal to the cutting edge spacing (D) of the punching blade 1.

[0064] The cylinder 42 of the drive mechanism 4 for the punching blade 1 and the cylinder 46 of the pressing mechanism 8 for the outer pusher 2 are controlled by the controller 47 to independently reciprocate the outer pusher 2 and the punching blade 1 in the vertical direction. The controller 47 controls the cylinder 42 of the drive mechanism 4 and the cylinder 46 of the pressing mechanism 8 to punch the test material 6 into test pieces 7 in the following steps.

[0065] (1) The cylinder 42 of the drive mechanism 4 and the cylinder 46 of the pressing mechanism 8 are positioned in the raised position. The blade unit 3 is connected to the upper and lower base 41, and the outer pusher 2 is connected to the cylinder 46 of the pressing mechanism 8. (2) Place the test material 6 on the elastic layer 50 of the support base 5. (3) The cylinder 46 of the pressing mechanism 8 lowers the outer pusher 2. The outer pusher 2 presses against the surface of the test material 6 on the outside of the pair of parallel cutting sections 1X. The lowered position of the outer pusher 2 is set to a position where it presses against the test material 6 and prevents displacement due to frictional resistance, as shown in Figure 7. The pressing mechanism 8 can prevent displacement by controlling the pressure applied by the outer pusher 2 to the surface of the test material 6, or by controlling the vertical position in which it presses against the surface of the test material 6. The pressing mechanism 8 that controls the pressure can control the pressure applied by the outer pusher 2 to the surface of the test material 6 by controlling the hydraulic or pneumatic pressure supplied to the cylinder 46. The pressing mechanism 8 that controls the vertical position can control the position in which the outer pusher 2 presses against the surface of the test material 6 by providing a stopper (not shown) that identifies the lowered position of the outer pusher 2. (4) The outer pusher 2 presses against the surface of the test material 6 to prevent displacement, and the drive mechanism 4 lowers the punching blade 1. As the punching blade 1 descends, the cutting edge 10 cuts the test material 6, as shown in the enlarged cross-sectional view of Figure 8. At this time, the outer pusher 2 is pressing against the test material 6 and holding it in a position where it will not shift, so the cutting edge 10 cuts the test material 6 which has not shifted, and cuts the test piece 7 to the exact width (W) of the test area 7X. (5) After the test material has been cut into test pieces, the drive mechanism 4 raises the punching blade 1 and the pressing mechanism 8 raises the outer pusher 2 to separate the cut test pieces 7 from the punching blade 1. [Industrial applicability]

[0066] The present invention can be suitably used as a cutting device and cutting method for cutting test materials of various materials and thicknesses into test pieces used for tensile tests, impact tests, and the like. [Explanation of symbols]

[0067] 100, 200... Cutting device 1… Punching tool 1X...Parallel cutting section 1Y...Edge cutting section 2…Outer pusher 2X…Test area pressing section 2a...Pressure surface 2m…vertical frame 2n…Horizontal frame 3…Blade unit 4…Drive mechanism 5...Support stand 6…Test materials 7…Test specimen 7X…Examination Area 7Y...Chucking section 8…Pressing mechanism 10…Blade tip 11...Outer blade surface 13…Cylindrical outer surface 14…Cylindrical inner surface 15…Blade tip 20...Elastic body 20a... Coil spring 23…Connecting rod 23a...Screw part 23b... Screw head 24... Stopper mechanism 24a... Nut 25…Through hole 26…recess 30…Base plate 30a... Through hole 31...Connection part 34… Guide gap 41…Upper and lower stand 42...Cylinder 42a... Rod 43… Guide mechanism 43a... Guide rod 43b... Guide tube section 45...Main body 46...Cylinder 47…Controller 50...Elastic layer 91… Punching tools 91X... Parallel cutting section 92...Blade tip 93...Outer blade surface 94...Elastic layer 95... Stand 96…Test materials 97…Test piece

Claims

1. A support base with an elastic layer on its surface, A punching blade for cutting the test material set on the elastic layer of the support base into a test piece with a test area of ​​a certain width (W), A drive mechanism that presses the cutting edge of the punching tool against the test material to cut it into a test piece, An outer pusher that presses the test material, which is cut by the punching blade, against the elastic layer, The system includes an outer pusher and a pressing mechanism that presses the outer pusher against the surface of the test material. The punching tool includes a pair of parallel cutting sections for cutting the test area of ​​the test piece, The outer pusher has a pair of test area pressing sections that press the test material along the outside of the parallel cutting section, The pressing mechanism comprises a connecting rod and an elastic body. The connecting rod is formed by connecting the outer pusher to the base plate. The elastic body is a coil spring disposed on the connecting rod, The pressing mechanism presses the outer pusher against the surface of the test material, causing the test area pressing section to press the test material on both sides of the outer side of the pair of parallel cutting sections. A test piece cutting device in which the punching blade cuts the test material set on the elastic layer of the support base into a test piece.

2. A test specimen cutting device according to claim 1, A test piece cutting device comprising a connecting rod that connects both ends and both sides of the outer pusher to the base plate.

3. A support base with an elastic layer on its surface, A punching blade for cutting the test material set on the elastic layer of the support base into a test piece with a test area of ​​a certain width (W), A drive mechanism that presses the cutting edge of the punching tool against the test material to cut it into a test piece, An outer pusher that presses the test material, which is cut by the punching blade, against the elastic layer, The system includes an outer pusher and a pressing mechanism that presses the outer pusher against the surface of the test material. The punching tool includes a pair of parallel cutting sections for cutting the test area of ​​the test piece, The punching tool has a single edge on the outer cutting surface, A guide gap is provided between the outer pusher and the outer surface of the punching blade, allowing the punching blade and the outer pusher to reciprocate relative to each other. The outer pusher has a pair of test area pressing sections that press the test material along the outside of the parallel cutting section, The pressing mechanism presses the outer pusher against the surface of the test material, causing the test area pressing section to press the test material on both sides of the pair of parallel cutting sections, thereby preventing misalignment during cutting. A test piece cutting device in which the punching blade cuts the test material set on the elastic layer of the support base into a test piece.

4. A test specimen cutting device according to claim 3, A specimen cutting device in which the guide gap is 0.1 mm or more and 5 mm or less.

5. A test specimen cutting device according to any one of claims 1 to 4, The drive mechanism for the punching blade is The upper and lower bases on which the punching blade is fixed, The system includes a vertical mechanism that causes the upper and lower platforms to move back and forth. The pressing mechanism of the outer pusher is An elastic body formed by elastically pressing the outer pusher from the upper and lower bases, The outer pusher is equipped with a stopper mechanism that determines the extrusion position from which it is pushed out from the upper and lower bases, A test piece cutting device in which the extrusion position of the stopper mechanism is a position that protrudes more than the cutting edge surface of the punching blade.

6. The setting process involves setting the test material to be cut into a test specimen onto the elastic layer on the surface of the support, A method for cutting a test specimen, comprising a punching step of cutting the test material set in the elastic layer in the setting step into a test specimen with a test area of ​​a constant width (W), In the punching process, The test material is cut by a punching blade which is an integrated cylindrical shape having a pair of parallel cutting sections for cutting the test area, and has a single-edged outer blade, At the moment when the punching blade cuts the test material, The pressing mechanism uses the elastic body of a coil spring arranged on the connecting rod to press the outer pusher against the surface of the test material. A method for cutting a test piece, comprising pressing the outer surfaces of both of the pair of parallel cutting sections toward the elastic layer with the test area pressing section of the outer pusher, and cutting the test material into a test piece with the punching blade.

7. A method for cutting a test specimen according to claim 6, In the punching process, A method for cutting a test piece, comprising using a single-edged punching blade with an outer cutting surface, providing a guide gap between the outer surface of the punching blade and the test area pressing portion, and cutting the test material with the guide gap being 0.1 mm or more and 5 mm or less.

8. A method for cutting a test specimen according to claim 6 or 7, In the punching process, A method for cutting a test piece, wherein the punching blade cuts the test material into a dumbbell-shaped test piece with the central part as the test area.

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