JPH085531A - Constant-temperature-type impact tester - Google Patents

Abstract

PURPOSE:To accurately and efficiently measure a relation between impact strength of a material and a temperature by providing a testing part of an impact tester and a supplier for supplying a sample to the testing part inside a constant-temperature chamber. CONSTITUTION:A constant-temperature-type impact tester 1 comprises an impact tester 3 placed on an upper face of a stand 2 and a sealed constant-temperature chamber 4 incorporating a testing part directly related to an impact test of the tester 3, a sample supplier, etc., while the chamber 4 is coupled via a duct 5 to a temperature controller 33 placed inside the stand 2. The tester 3 is of a pendulum type, wherein a hammer 6 and its moving range are surrounded by a heat-insulating material 11 of the chamber 4. A stocker 22 for samples 14 and a supplier comprising a carrier 23 are provided at a rear part in the chamber 4. Air in the chamber 4 is circulated by a fan 20 to obtain a uniform temperature distribution, while the air is heated/cooled by atmospheric gas circulating between the controller 33 and the duct 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant temperature impact tester for accurately and efficiently performing an impact test on a sample in a constant temperature chamber maintained at a predetermined test temperature.

[0002]

2. Description of the Related Art In a conventional impact tester with a constant temperature bath, when a test piece contained in a stocker in the constant temperature bath reaches a certain temperature, the test piece is manually taken out from the stocker and subjected to an impact test at room temperature. It was something to do. Further, another conventional impact tester with a constant-temperature bath supplies air from the constant-temperature bath to a test bath equipped with a sample stage for test pieces and a test-piece transport device, whereby a constant temperature is maintained inside the test bath. The test piece was automatically taken out from the stocker after the temperature was kept at 1, and an impact test was performed at room temperature.

[0003]

In the conventional impact tester with the constant temperature bath, even if the test piece reaches a certain temperature in the constant temperature bath, since the impact test is performed at room temperature, the actual test temperature, There is a problem in that there is a difference in temperature from the constant temperature bath. This difference becomes large especially when the thermostatic chamber is set to a low temperature, and there is a problem in that the error in the measured value of the impact test becomes large and the measured value varies, resulting in lack of reliability.

In another conventional impact tester with a constant temperature bath,
The inside of the test tank is kept at a constant temperature by feeding air from the constant temperature tank so that the test piece has a constant temperature, but the temperature adjustment by the constant temperature tank is limited to the inside of the test tank. A part of the hammer hitting the test piece is exposed to room temperature, and there is a problem that a temperature difference is apt to occur between the hammer and the test piece. In addition, since the test tank has an opening through which a hammer goes in and out, there is a problem that the influence of the disturbance due to the room temperature cannot be ignored especially when the temperature difference between the temperature inside the test tank and the room temperature is large.

In recent years, materials have been diversified, and the conditions under which the materials are exposed have widened from low temperature to high temperature. Therefore, temperature characteristics of materials at low and high temperatures are important. It is a good selection indicator. Then, the impact strength of the material changes greatly in the vicinity of the transition temperature such as crystal transition or glass transition. Therefore, there is a problem that an impact tester capable of accurately and efficiently measuring the relationship between the impact strength of a material and the temperature is required.

In order to solve the above-mentioned problems and problems, the present invention uses a system including a test part directly involved in an impact test as a closed system and keeps the entire closed system at a predetermined temperature, thereby It is an object of the present invention to provide a constant temperature type impact tester capable of accurately and efficiently measuring the relationship between impact strength and temperature.

[0007]

In order to achieve the above object, the constant temperature type impact tester of the present invention is an impact tester provided with a constant temperature chamber, and the impact tester is provided inside the constant temperature chamber. It is characterized in that a test part directly involved in the impact test of the tester and a supply device for supplying a sample to the test part are provided, and the constant temperature chamber is connected to a temperature control device. The test section includes a hammer that strikes the sample and a sample table, and the supply device includes a sample stocker and a transfer device that transfers and places the sample from the stocker to the sample table. Is characterized by. The frame of the impact tester is located outside the constant temperature chamber, the bearing of the frame pivotally supports the drive shaft of the hammer, and the movement range of the hammer is surrounded by the heat insulating material of the constant temperature chamber. It is characterized by being present. The constant temperature chamber is characterized by being provided with a discharge tube for discharging the sample after the impact test. The constant temperature chamber is provided with a dimension measuring device for measuring the outer dimension of the sample. A double-opening door is provided on the front surface of the constant temperature chamber, and an observation window is provided on one of the doors.

[0008]

The constant temperature type impact tester of the present invention has the above-mentioned configuration, and in a wide temperature range from low temperature to high temperature, the sample and the test section directly involved in the impact test of the impact tester are not disturbed by room temperature. Since it does not receive the impact, the impact strength of the material can be measured accurately and efficiently at each predetermined temperature.

[0009]

EXAMPLE A constant temperature type impact tester 1 of the present invention is shown in FIGS. 1 is a front view and FIG. 2 is a side sectional view. The constant temperature type impact tester 1 has a shock tester 3 installed on the upper surface of a pedestal 2 and a test section and a sample supply device which are directly involved in the impact test of the impact tester 3 as described later. A closed constant temperature chamber 4 is also provided on the upper surface of the pedestal 2, and the constant temperature chamber 4 is connected to a temperature control device 33 installed in the pedestal 2 via a conduit 5. In addition to the above, the constant temperature type impact tester 1 is provided with a control panel 34, and a control box 3 including a control mechanism such as a sequence control mechanism and a calculation mechanism, and a power supply unit.
6 is installed in contact with the upper surface of the gantry 2 and the side surface of the constant temperature chamber 4.

A frame 7 having a substantially U-shaped side surface is provided outside the constant temperature chamber 4 at the front of the impact tester 3. The front part of the frame 7 is made of a prismatic member,
The rear part is made of a thick triangular plate member. The frame 7 is supported by the pedestal 2 via two columns 8 fixed to both ends at the lower end of the thick triangular plate-shaped member at the rear portion. Here, the column 8 is located in the constant temperature chamber 4. The bearing 9 provided at the lower end of the frame 7
The drive shaft 10 provided on the upper end of the hammer 6 that strikes the sample 14 is pivotally supported, and thus the frame 7 pivotally supports the hammer 6. The drive shaft 10 is inserted into a heat insulating material 11 forming the constant temperature chamber 4, and the heat insulating material 11 surrounds the hammer 6. Further, one end of the drive shaft 10 is attached to the frame 7 and connected to a hammer return motor 12 via a reduction gear.

As a result, the impact tester 3 has a structure of a pendulum type impact tester, and the hammer 6 and its moving range are surrounded by the heat insulating material 11 of the constant temperature chamber 4. The impact tester is not limited to the pendulum type, but may be a vertical drop type or any other type.

The tip of the hammer 6 moves in a circular area surrounded by the heat insulating material 11 of the constant temperature chamber 4, as shown by the center line with an arrow in FIG. Further, a sample table 13 is provided vertically below the drive shaft 10 of the hammer 6, and the sample table 13 is configured to clamp the lower end portion of the sample 14 to fix the sample 14, and the hammer 6 When the hammer 6 hits the measurement site near the upper end of the sample 14 when it is at the lowest position,
The position is adjusted. As described above, the hammer 6 and the sample table 13 which are the test units directly involved in the impact test of the impact tester 3 are provided in the front portion of the constant temperature chamber 4.

Further, a discharge tube 15 for discharging the broken sample after the impact test is provided between the lower end of the sample table 13 and the upper surface of the pedestal 2, and the outer peripheral side portion of the discharge tube 15 is It is attached to the heat insulating material 11 of the constant temperature chamber 4 through the columns of the sample table 13. A slide-type door 17 that is opened and closed by a cylinder 16 is attached to the lower end of the discharge tube 15, and the broken sample passes through a duct from the door 17 and a drawer 3 provided in the front part of the gantry 2.
It is designed to fall to 5.

On the front surface of the constant temperature chamber 4, double doors 37 and 38 are provided, and one of the doors 37 is provided with an observation window 18. The observation window 18 is formed of a pair of heat insulating glasses. Similarly, the heat insulating material 11 is on the upper surface.
The slide type door 19 formed in 1. is provided. A broken line with an arrow in FIG. 2 indicates the sliding range of the door 19. Further, the surface of the portion of the conduit 5 that is piped in the constant temperature chamber 4 is formed in a shape that improves the efficiency of heat exchange. A fan 2 for agitating and circulating the air in the constant temperature chamber 4 is provided at the rear part of the constant temperature chamber 4.
0 is directly connected to the motor 21.

Further, in the rear part of the constant temperature chamber 4, there is provided a supply device for the impact tester 3 including a stock car 22 for the sample 4 and a transfer device 23. The stock car 22 includes a sample take-out rod 24, a cylinder 25 for operating the sample take-out rod 24 up and down, an operation member 26 for sequentially moving the samples 14 laterally accommodated in the stock car 22 in the left direction in FIG. A cylinder 27 for moving the operation member 26 in the lateral direction is provided.

The transfer device 23 is located above the stock car 22 in the constant temperature chamber 4 and has a horizontally elongated screw 28 and a sample holding member 29 screwed to the screw 28.
It consists of Elongated slide plates are provided at upper and lower portions in the vicinity of the screw 28, and a sample holding member 29 is inserted into the elongated slide plate.
The front end of the screw 28 is located near the hammer 6, and the rear end of the screw 28 is connected to the motor 30 via a reduction gear. Further, the sample holding member 29 is provided with two movable holding pieces 31.
When 9 moves to the front end of the screw 28, the clamping piece 31
Is located directly above the sample table 13. The supply device is not limited to the one having the above configuration.

Inside the constant temperature chamber 4, in addition to the above, a dimension measuring device 32 for measuring the outer dimension of the sample 14 is provided. A temperature sensor, which is a detection end of the temperature control device 33, is arranged inside the constant temperature chamber 4. Other members, devices, etc. may be provided inside the constant temperature chamber.

The constant temperature chamber 4 includes an insertion portion of the shaft 10 opened in the heat insulating material 11, an insertion portion of the screw 28, an insertion portion of the shaft of the fan 20, and an insertion portion of the operation member 26.
The penetration part of the conduit 5 and the insertion part of the sample extraction rod 24 are all airtight. As a result, the inside of the constant temperature chamber 4 is a closed system.

The air in the constant temperature chamber 4 is supplied to the fan 20.
And has a uniform temperature distribution, and the atmosphere gas circulating between the temperature control device 33 and the conduit 5 causes
This air is heated or cooled. The temperature detected by the temperature sensor and the temperature control device 33 control the temperature inside the constant temperature chamber 4 to a predetermined temperature.

Here, since the metal frame 7, which occupies most of the weight of the impact tester 3, is provided outside the constant temperature chamber 4, the test members and devices provided inside the constant temperature chamber 4 are tested. The weight of the two pillars 8 and the hammer 6 are the majority, but the weight of both is considerably lighter than the weight of the frame 7. Therefore, the heat capacity in the constant temperature chamber 4 is greatly reduced. Moreover, providing the frame 7 outside the constant temperature chamber 4 greatly improves the heat insulating effect of the constant temperature chamber 4. As described above, the temperature control device 33 can accurately control the temperature in the constant temperature chamber 4 and greatly reduce the amount of electric power required for cooling and heating.

A procedure for performing an impact test on the sample 14 using the constant temperature impact tester 1 having the above-described structure will be described below. First, the slide type door 19 of the constant temperature chamber 4 is opened, the required number of the samples 14 are set side by side in the sample stocker 22, and the operation unit 26 is sandwiched between them, and the door 19 is closed to prepare for the test. Complete. Next, the impact test is started, but the following operations are actually performed by the sequence control mechanism or the like.

In the control panel 34, the constant temperature chamber 4 is set to a predetermined temperature and the hammering start position of the hammer 6 is set. When the inside of the constant temperature chamber 4 reaches a predetermined temperature and becomes more stable, and the hammer 6, the sample table 13, the sample 14, etc. all reach the predetermined temperature, the cylinder 25 operates and the take-out rod 24 moves the front end of the stocker 22. The sample holding member 29 of the transporting device 23 holds the pushed-up sample 14 by the movable holding piece 31. Then, the take-out rod 24 immediately returns to the original position. Then screw 28
Rotates, the sample holding member 29 moves forward, and when the sample 14 is positioned on the dimension measuring device 32, the rotation of the screw 28 is temporarily stopped, and the outer dimension of the sample 14 is measured. This measured value is written in the storage unit of the arithmetic mechanism. Here, since the dimension measuring device 32 is provided in the constant temperature chamber 4, the outer dimensions of the sample 14 are always measured at the test temperature. Since the impact energy value of the impact test and the outer dimension of the sample 14 are measured at the same test temperature, the impact strength of the material can be obtained with consistency.

Then, the rotation of the screw 28 is restarted, and when the sample 14 is located right above the sample table 13, the rotation of the screw 28 is stopped. Here, the sample holding member 29
The movable holding piece 31 is opened, and the sample 14 is placed on the sample table 13. Then, the sample table 13 holds and fixes the lower end of the sample 14. In parallel with this operation, the screw 28 is rotating in the reverse direction, and the sample holding member 29
Has returned to its original position and stopped. The sample 14 of the stock car 22 is moved to the front end by the operating member 26. When the sample 14 is fixed to the sample table 13, the tip end of the hammer 6 falls from the striking start position along the circular center line shown in FIG. The impact point hits the measurement site at the upper end of the sample 14 and breaks the sample 14. The impact energy value at the time of striking is written in the storage unit of the calculation mechanism, the impact strength of the sample 14 is calculated together with the previous dimension measurement value, displayed on the control panel 34, and written in the storage unit of the calculation mechanism. Be done.

After the impact test is completed, the hammer 6 is returned to the original impact start position by the hammer return motor 12. Further, the broken sample falls from the discharge tube 15, and immediately the slide type door 17 opens and drops into the drawer 35. Here, since the door 17 is opened and closed instantaneously, the temperature inside the constant temperature chamber 4 is not affected. The above-described operation is repeated until the impact test of the sample 14 placed side by side on the stock car 22 is completed.

Here, in general, the sample of the impact test is a strip-shaped sample, and the measurement site which is hit by the hammer has a triangular notch on the opposite side. Therefore, for example, in a metal sample, the heat capacity at the measurement site is extremely small and the heat conductivity is high. Therefore, the temperature of the measurement site is easily affected by a disturbance such as an air flow accompanied when the hammer falls. Further, when the hammer hits the measurement site and the temperature difference between the hammer and the measurement site is large, the heat conduction between the hammer and the measurement site occurring at that moment may affect the measured value of the impact strength.

However, in the constant temperature impact tester 1, since the test members such as the hammer 6 are housed in the closed constant temperature chamber 4 as described above, the sample 14 is the hammer 6.
It is not affected by the above-mentioned disturbances or impacts when it receives a shock.

[0027]

According to the present invention, a closed constant temperature chamber is provided with a test section and a sample supply device which are directly involved in a direct test such as a hammer of an impact tester.
With this configuration, the test part including the hammer is always in the constant temperature chamber, and its temperature matches the temperature of the sample, so the impact test can be performed over a wide temperature range from low temperature to high temperature without being affected by disturbance. Can be implemented. This provides a constant temperature type impact tester that accurately measures the relationship between impact strength and temperature. Moreover, since the frame, which occupies most of the weight of the impact tester, does not participate in the direct impact test, it is placed outside the constant temperature chamber. This reduces the heat capacity inside the constant temperature chamber and enhances the heat insulating effect. As a result, the temperature in the constant temperature chamber reaches a predetermined temperature in a short time, so that the impact test can be efficiently performed and the energy can be saved. Further, the temperature of the constant temperature chamber can be accurately controlled, and the reliability of the impact test value is improved. The rupture simples after the end of the test are instantaneously discharged by the discharge cylinder, and the impact test efficiency is improved without affecting the temperature in the constant temperature chamber.
Since the sample size measuring device is in the constant temperature chamber, the impact strength of the material can be obtained in a consistent manner. Since the double door and the observation window are provided on the front of the constant temperature chamber, the hammer can be easily replaced, contributing to the efficiency of the impact test, and the hammer is not exposed, so the test can be performed safely. It can be carried out and the fracture state of the sample can be observed at all times.

[Brief description of drawings]

FIG. 1 is a front view of a constant temperature impact tester of the present invention.

FIG. 2 is a side sectional view of a constant temperature type impact tester.

[Explanation of symbols]

 1 Constant Temperature Impact Tester of the Present Invention 2 Stand 3 Impact Tester 4 Constant Temperature Chamber 6 Hammer 7 Frame 11 Heat Insulation Material 13 Sample Stand 14 Sample 15 Discharge Cylinder 18 Observation Window 22 Stocker 23 Conveyor 26 Operating Member 28 Screw 29 Sample Holding Member 37 double door 38 double door

Claims (6)

[Claims] 1. An impact tester having a constant temperature chamber, wherein a test unit directly involved in the impact test of the impact tester and a supply device for supplying a sample to the test unit are provided inside the constant temperature chamber. A constant temperature type impact tester, wherein the constant temperature chamber is connected to a temperature control device. 2. The test section comprises a hammer for hitting a sample and a sample table, and the supply device includes a sample stocker and a carrying device for carrying the sample from the stocker to the sample table and placing it there. The constant temperature impact tester according to claim 1, wherein the impact tester is a constant temperature impact tester. 3. A frame of the impact tester is located outside the constant temperature chamber, a bearing of the frame supports a drive shaft of the hammer, and a movement range of the hammer is in the constant temperature chamber. The constant temperature impact tester according to claim 1 or 2, wherein the heat insulating material is surrounded. 4. The constant temperature impact tester according to claim 1, wherein the constant temperature chamber is provided with a discharge tube for discharging a sample after the impact test. 5. The thermostatic impact tester according to claim 1, wherein the thermostatic chamber is provided with a size measuring device for measuring the external size of the sample. 6. The constant temperature impact test according to claim 1, wherein a double door is provided on a front surface of the constant temperature chamber, and an observation window is provided on one of the two doors. Machine.