JP4390075B2 - Shock compression test equipment - Google Patents

Description

  The present invention relates to an impact compression test apparatus for investigating the behavior of an object to be tested by applying an impact compression load.

  In a so-called compression test in which a compressive load is applied to a test object, generally, the test object is disposed between platens facing each other, and one platen is pushed out by an actuator so as to approach the other platen, Apply a compressive load to the DUT.

  Conventionally, the structure of the basic load mechanism is the same in the impact compression test apparatus that applies a shock compression load to the DUT, and the actuator moves the moving platen to the fixed platen at a high speed. Thus, an impact compression load is applied to the DUT disposed between them (see, for example, Patent Document 1).

That is, as schematically shown in FIG. 8, the fixed platen 72 is fixed to the base 71 a of the device frame 71, and the moving side is fixed to the tip of the piston rod 73 a of the hydraulic cylinder 73 mounted on the device frame 71. The platen 74 is attached, the hydraulic cylinder 73 is driven, and the piston rod 73a is protruded to move the movable platen 74 in a direction approaching the fixed platen 72, and is arranged between the platens 72 and 74. An impact compression load is applied to the DUT W. The impact load acting on the DUT W is usually detected by a load cell arranged on the stationary platen 72.
JP 2001-59803 A

  By the way, according to the conventional impact compression test apparatus as described above, when the hydraulic cylinder 73 is driven at a high speed so as to apply an impact compression load to the test object W, the piston rod 73a cannot be stopped suddenly. Even after a required impact load is applied to W, the moving platen 74 moves toward the fixed platen 72 at a high speed, and is applied to the load cell, each of the platens 72 and 74, and further to the DUT W. There was a problem that an overload acted and these excessive energy may damage them. In addition, since the compression plate 74 on the moving side is pushed out by the hydraulic cylinder 73 and an impact compression load is applied to the test object W, there is also a problem that the piston rod 73a may be buckled by the action of an excessive load.

  The present invention has been made in view of such circumstances, and it is a main object of the present invention to provide an impact compression test apparatus that is less likely to be overloaded and that can suppress damage to the apparatus. Another object is to provide an impact compression test apparatus that does not cause buckling.

In order to solve the above-mentioned main problems, the impact compression test apparatus of the present invention has a DUT placed between a fixed platen and a moving platen facing each other, and the moving platen is driven by a hydraulic cylinder. A test apparatus for applying an impact compression load to the DUT between the platens by bringing the platen on the fixed side closer to the fixed platen, and the fixed platen is operated by a preset force. It is attached to the base via an overload prevention mechanism that absorbs shock by displacement , and the overload prevention mechanism is set in the direction opposite to the direction of the force acting on the fixed platen during the test. When the force acting on the fixed platen exceeds the set force during the test, the fixed platen moves against the force set in the opposite direction. Absorbs the above shock It characterized by being configured to so that (claim 1).

Here, in the present invention, the overload prevention mechanism can be constituted by an air cylinder to which air of a predetermined pressure is supplied (claim 2).

  The invention according to claim 3 solves another problem in addition to the above, and a fixed platen between the moving platen and a hydraulic cylinder for moving the moving platen. And is configured such that a compressive load is applied to the device under test by pulling the moving platen toward the hydraulic cylinder by the hydraulic cylinder.

  The present invention provides an overload prevention system that displaces and absorbs an impact when a force exceeding a set force is applied between a fixed platen and a base, for example, an air cylinder in the invention according to claim 2. By interposing the mechanism, the force acting on the stationary platen during the test is limited, and the main problems are solved.

  In other words, instead of directly fixing the platen to the base, the hydraulic cylinder is driven at a high speed by interposing an overload prevention mechanism that absorbs shock by being displaced by the action of a force exceeding the set force. Even if it does not stop suddenly, the load exceeding the set load will be absorbed by the displacement of the platen on the fixed side, and the force exceeding the set force will not act on the load cell, both platens, the DUT or base, etc. It is possible to prevent these members from being damaged due to the action of overload.

  Further, as in the invention according to claim 3, by adopting a configuration in which a stationary platen is arranged between a moving platen and a hydraulic cylinder for moving the moving platen, the moving platen is pulled by the hydraulic cylinder. As a result, a compressive load can be applied to the device under test, and a tensile load acts on the piston rod of the hydraulic cylinder during the test, and there is no possibility of the piston rod buckling during the test.

  According to the present invention, when the force acting during the test exceeds the set force by the overload prevention mechanism, the fixed-side platen is displaced in the load acting direction and absorbs the impact force. The applied force does not act on the load cell, the platen, the DUT, the base, etc., and damage to these members can be prevented.

  Further, as in the invention according to claim 3, by adopting a configuration in which a fixed-side pressure platen is arranged between a moving-side pressure platen and a hydraulic cylinder for moving the moving-side pressure platen, the moving-side pressure platen is drawn by the hydraulic cylinder. As a result, a compressive load can be applied to the object to be tested, and when the compressive load is applied, a tensile force acts on the piston rod of the hydraulic cylinder, and there is no possibility of the piston rod buckling due to the test force.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of an embodiment of the present invention, showing a front view representing a mechanical configuration and a block diagram representing a system configuration, a hydraulic circuit configuration, and an air circuit configuration. 2 is an enlarged front view of the load mechanism 20, FIG. 3 is a plan view thereof, and FIGS. 4 and 5 are cross-sectional views taken along planes AA and BB shown in FIG. 3, respectively. . FIG. 6 is a perspective view of the load mechanism 20.

  The test machine main body 1 has a structure in which a load mechanism 20 is arranged on an apparatus frame 10 in which a yoke 13 is fixed on a base 11 via a plurality of columns 12.

  The load mechanism 20 uses the hydraulic cylinder 21 fixed to the yoke 13 as an actuator, and the hydraulic cylinder 21 moves the moving side platen 22 in a direction approaching the fixed side platen 23 so as to be tested. An impact compression load is applied to the body W. That is, the moving-side platen 22 is fixed to the moving plate 24, and the moving plate 24 is connected to the moving member 25 by the two support rods 24a and 24b. The moving member 25 is connected to the piston rod 21 a of the hydraulic cylinder 21. On the other hand, the fixed-side platen 23 is fixed to a fixed plate 26, and this fixed plate 26 is connected to a fixed member 27 by two support bars 26a and 26b.

  Support rods 24a and 24b connecting the moving plate 24 and the moving member 25 penetrate through the fixed plate 26 via bushes 26c and 26d, respectively. Further, the support rods 26a and 26b that connect the fixed plate 26 and the fixed member 27 penetrate the moving plate 24 through bushes 24c and 24d, respectively. With this configuration, when the moving plate 24 and the fixed plate 26 are relatively displaced, the support rods 24a, 24b and 26a, 26b are moved by the fixed body 26 or the movable body 26 via the bushes 26c, 26d or 24c, 24d, respectively. Guided by the plate 24.

  The test object W to which the impact compression load is to be applied is placed on the moving platen 22 fixed to the moving plate 24. The fixed-side platen 23 is fixed to the fixed plate 26 via a load cell 31 for detecting a test force (compression load) acting on the DUT W. Further, the displacement plate 32 for detecting the relative displacement between the movable plate 24 and the fixed plate 26 is disposed. The hydraulic cylinder 21 is provided with a stroke sensor 33 for detecting the displacement of the piston rod 21a. The outputs of the load cell 31, the displacement meter 32, and the stroke sensor 33 are taken into the control device 34, respectively.

  The hydraulic cylinder 21 for load described above is operated by the hydraulic oil supplied from the hydraulic unit 35, and the inflow / outflow amount of the hydraulic oil with respect to the hydraulic cylinder 21 is controlled by the servo valve 36. The servo valve 36 is driven and controlled by an operation signal obtained by feeding back the output of the displacement meter 32 to a target value in the control device 34. Accordingly, the hydraulic cylinder 21 is driven and controlled so that the relative displacement of the moving-side platen 22 with respect to the fixed-side platen 23 matches a preset target value.

  Now, the fixed plate 26 is fixed to the piston rod 41 a of the air cylinder 41. High pressure air is supplied to the air cylinder 41 from the air source 42 via the pressure regulating valve 43 and the air tank 44, and downward force is applied to the piston rod 41a by the supply of the high pressure air. This force can be arbitrarily changed by the set pressure of the pressure regulating valve 43.

  In the above configuration, by driving the hydraulic cylinder 21 and pulling the moving plate 24 upward at a high speed, that is, by pulling the moving plate 24 to the hydraulic cylinder 21 side, the running section shown by H in FIG. After that, the DUT W is sandwiched between the moving platen 22 and the fixed platen 23, and an impact compression load is applied. At this time, the impact compression load acting on the test object W is detected by the load cell 31, and the relative displacement between the moving platen 22 and the fixed platen 23 is detected by the displacement gauge 32. Know the impact compression characteristics. During this test, the fixed plate 26 is drawn downward by the air cylinder 41, and when the pressure in the air cylinder 41 exceeds the set pressure by the pressure regulating valve 43 due to the upward force acting on the fixed platen 23. The air in the air cylinder 41 escapes into the air tank 44, whereby the fixed plate 26 moves upward.

  The points to be particularly noted in the operation of the embodiment of the present invention described above are that the impact compression load is applied to the DUT W by pulling the moving platen 22 toward the hydraulic cylinder 21 side, and the fixed side during the test. When the force acting on the platen 23 exceeds the downward pulling force by the air cylinder 41, the fixed plate 26 fixing the platen 23 on the fixed side moves upward. A tensile load (stress) is applied to the piston rod 21a of the cylinder 21, so that the piston rod 21a is not buckled and a force exceeding the force corresponding to the set pressure of the pressure regulating valve 43 is applied to the fixed side. It is possible to prevent the platen 23, the load cell 31, and the test object W from acting on the platen 23. As a result, jigs such as the load cell 31 and the platen 22 and 23 are not damaged.

  Here, in the above embodiment, the overload prevention mechanism is constructed by interposing the air cylinder 41 between the fixed-side platen 23 and the base 11, but for example, the direction opposite to the direction of the action of the compression load is constructed. A mechanism in which a pressurized spring and a damper are combined can be used as an overload prevention mechanism. In this case, when a force exceeding the pressure applied by the spring is applied, the spring is deformed and the platen 23 on the fixed side is displaced, so that an excessive compressive force can be absorbed together with the buffering action of the damper.

  Further, in the above embodiment, the fixed-side pressure platen 23 is arranged between the moving-side pressure platen 22 and the hydraulic cylinder 21, so that a tensile load is applied to the piston rod 21a and a compression load is applied to the object W to be tested. For example, the maximum load capacity is set smaller than the diameter of the piston rod, and it is not necessary to consider the buckling of the piston rod, but only the jig and load cell damage due to overload are considered. In the case where it suffices, the positional relationship between each platen and the hydraulic cylinder is not necessarily required.

  That is, as shown in FIG. 7 as an example of the configuration of the main part, an overload prevention mechanism comprising an air cylinder 41, an air source 42, a pressure regulating valve 43 and an air tank 44 equivalent to the previous example is provided on the base 11 of the testing machine body 1. At the same time, the fixed platen 23 is attached to the piston rod 41a of the air cylinder 41 via the fixed plate 26 and the load cell 31, while the yoke 13 fixed to the base 11 via the plurality of columns 12 includes A hydraulic cylinder 21 for load is fixed, and a moving platen 22 is attached to a piston rod 21 a of the hydraulic cylinder 21 via a moving plate 24.

  In this configuration, by moving the moving side platen 22 downward by the hydraulic cylinder 21, that is, by moving it so as to push it out, an impact is applied to the DUT W between the fixed side platen 23 and the moving side platen 23. Apply compressive load. In this case, although a compressive stress is applied to the piston rod 21a of the hydraulic cylinder 21, when a compressive force exceeding the force corresponding to the set pressure of the pressure regulating valve 43 is applied to the fixed platen 23 as in the previous example. In addition, the piston of the air cylinder 41 can be displaced downward to relieve the impact compression force.

In the configuration diagram of the embodiment of the present invention, a front view showing a mechanical configuration and a block diagram showing an electrical configuration, a hydraulic circuit configuration and an air circuit configuration are shown. It is an enlarged front view of the load mechanism 20 of the embodiment of the present invention. FIG. 3 is a plan view of FIG. 2. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is a perspective view of load mechanism 20 of an embodiment of the invention. It is a block diagram of other embodiment of this invention. It is a schematic diagram which shows the structural example of the conventional impact compression test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Test machine body 11 Base 12 Column 13 Yoke 2 Loading mechanism 21 Hydraulic cylinder 21a Piston rod 22 Moving platen 23 Fixed platen 24 Moving plate 24a, 24b Support rod 24c, 24d Bush 25 Moving member 26 Fixed plate 26a, 26b Support rod 26c, 26d Bush 27 Fixed member 31 Load cell 32 Displacement meter 34 Control device 35 Hydraulic unit 36 Servo valve 41 Air cylinder 42 Air source 43 Pressure regulating valve 44 Air tank W Device under test

Claims (3)

A test object is placed between the fixed platen and the moving platen facing each other, and the moving platen is moved closer to the fixed platen by driving the hydraulic cylinder, so that A test device for applying an impact compression load to a test body,
The fixed-side platen is attached to the base via an overload prevention mechanism that absorbs shock by being displaced by the action of a preset force , and the overload prevention mechanism is connected to the fixed-side platen. Against the direction of the force acting during the test, and when the force acting on the stationary platen exceeds the set force when testing, An impact compression testing apparatus, wherein the platen is configured to move against the force set in the reverse direction and absorb the impact. 2. The apparatus for testing impact compression of the foregat according to claim 1, wherein the overload prevention mechanism is constituted by an air cylinder supplied with air of a predetermined pressure .   A fixed pressure platen is disposed between the moving platen and the hydraulic cylinder for moving the moving platen, and the moving pressure platen is drawn toward the hydraulic cylinder by the hydraulic cylinder to the DUT. The impact compression testing apparatus according to claim 1 or 2, wherein a compression load is applied.

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