JPS6152931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a core metal filling device, and more particularly to a device for filling a core metal inserted into a grip portion when performing a tensile test on a tubular test piece using a tensile test device.

Normally, when carrying out a tensile compression test on a tubular specimen using a testing machine, if the specimen is chucked into the testing machine as it is, the specimen itself will be crushed by the clamping force. I tried to solve the above-mentioned crushing problem with a lot of effort, but
A core metal of an appropriate shape is required for each test piece,
Since it was difficult to remove the entire core after the test was completed, the applicant had previously proposed the ``Tensile Test Method for Tubular Test Pieces (Japanese Patent Publication No. 1701/1983).'' In this method, both ends of the test piece except for the center are filled with a low melting point molten alloy, which is then cooled and solidified to form a core metal for testing. It has the characteristics that it can easily form a suitable core bar even with a tubular test piece, and it can also be easily removed.

The present invention relates to the above-mentioned application and provides a new device for forming a core bar by filling both ends of a tubular test piece with a low melting point melting member. In addition to providing a molten alloy reservoir to keep the melting point alloy in a molten state and filling the tank, a gripping mechanism is provided to grip the tubular test piece, and this gripping mechanism is rotated and vertically moved up and down to melt one end of the tubular test piece. It has a drive mechanism that inserts and removes the alloy into the alloy reservoir, a dish that can be inserted into the end of a tubular test piece, and a rod in the center, and a mechanism that inserts and removes the tubular test piece into the end of the molten alloy that is immersed in the molten alloy reservoir. A cored metal filling device is provided with a sealing mechanism for preventing liquid leakage and a moving mechanism for vertically raising and lowering the sealing mechanism, and is configured to form a cored metal inside a tube of a tubular test piece.

Next, the configuration of the apparatus of the present invention and the operation of forming a core on a test piece will be explained with reference to FIGS. 1 and 2.

In the figure, 2 is an arm drive unit provided on the base 1 to move the arm 3 up and down and rotate, and 8 is an arm drive unit provided at the tip of the arm 3 to grip the tubular test piece 9 near its center. 7 is a gripper drive unit that controls the gripping operation of this gripper 8; 6 is a gripper drive unit that controls the gripper 8 to move the tubular test piece 9 from a horizontal state to a vertical state or change the direction by 180 degrees while gripper 8; The gripper rotating motor 10 is made of Teflon or the like so that the gripper can be oriented in any direction, and when the tubular test piece 9 is pulled up from the melting tank 11, the molten alloy 12 that is not yet hardened leaks out. 4 is a sealing plate drive unit that moves the sealing plate 10 along the threaded rod 5 as the tubular test piece 9 is pulled up; 10a is a core; This is a rod (for example, made of Teflon, etc.) provided in the seal plate 10 to form an air vent hole 13 in the center of the metal plates 12a and 12b.
Therefore, both the sealing plate 10 and the rod 10a are not damaged or deformed by the low melting point melting member and can be easily separated from the member. In addition, the molten alloy 12 (for example, an alloy of tin, bismuth and lead such as wood metal, eualloy)
138, which has a melting point of around 100° C.) is stored in the melting tank 11 while being melted by a suitable heating means (not shown). Continuing with the above configuration, the operation of forming the core metals 12a and 12b on the tubular test piece 9 will be explained.

First, drive the arm 3 to bring the gripper 8 close to the place where the tubular test piece 9 is placed (however, this operation may be done manually to bring the gripper 8 closer to the test piece 9, or the gripper 8 may be brought closer to the test piece 9 by manual operation, The test piece 9 is gripped by the gripper drive unit 7 (the gripper 8 may be kept in a fixed position at all times and the gripper 8 automatically approaches the fixed position). Then, while gripping the test piece 9 with the gripper 8, the arm 3 is driven again to move it onto the melting tank 11. The test piece 9 brought to the top of the melting tank 11 in this way
is set vertically by the drive of the gripper rotation motor 6, and then lowered in the direction of the arrow and immersed in the melting tank 11 by a certain length from its tip as shown in Figure 2A. . and melting tank 11
After the molten alloy 12 enters the immersed part of the pipe, the seal plate 1 is moved by the operation of the seal plate drive unit 4.
0 is raised to close the open end of the tube from below, and the tubular test piece 9 is pulled up in the direction of the arrow as shown in the diagram, and the molten alloy 12 inside the tube is cooled and The solidified roller seal plate 10 is lowered and removed from the test piece 9. After forming the core bar 12a on one end of the tubular test piece 9 as described above, the test piece 9 itself is then rotated 180 degrees by the drive of the gripper rotation motor 6, as shown in Figures H and D. The core metal 12b is filled and formed at the opposite end in the same manner as before. In this case, since the previously formed core bar 12a has an air hole 13 formed by the rod 10a, high pressure gas is filled in the center of the tube when forming the later core bar 12b. can be prevented. Furthermore, this seal plate 10
If the rod 10a attached to the seal plate 10a is tapered, the seal plate 10 can be easily removed from the core metals 12a and 12b.

When the formation of the core metals 12a and 12b on both ends of the tubular test piece 9 is completed, the arm 3 is driven again to move the test piece 9 to a predetermined position.

As detailed above, this invention realizes a new device that can reliably and quickly form a core within the tube of a tubular test piece, and its effects will be extremely significant when put into practical use. .

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the main structure of an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the formation stage of core metal filling by the apparatus of the present invention. DESCRIPTION OF SYMBOLS 1...Base, 2...Arm drive part, 3...Arm, 4...Seal plate drive part, 5...Screw rod, 6...
...Gripper rotation motor, 7...Gripper drive unit, 8...Gripper, 9...Tubular test piece, 1
0... Seal plate, 10a... Rod, 11... Melting tank, 12... Molten alloy, 12a, 12b... Core metal, 13... Air hole.

Claims (1)

[Claims] 1 Both ends of a tubular test piece, excluding the center, are immersed in a molten alloy reservoir where a molten low melting point alloy is stored, and the alloy is filled into both ends, and then it is cooled and solidified to form a tubular test piece. A device for filling a cored metal includes a gripping mechanism that grips a tubular test piece, a drive mechanism that rotates and vertically moves the gripping mechanism up and down to insert and remove one end of the tubular test piece into and from a molten alloy reservoir, and a tubular test piece. A sealing mechanism has a dish part that can be inserted at one end and a rod vertically disposed in the center thereof, and is inserted into the end of the test piece immersed in the molten alloy reservoir, and the sealing mechanism is connected to the molten alloy reservoir. 1. A core metal filling device comprising: a moving mechanism that moves in a direction perpendicular to a portion of the metal core to perform dipping and lifting.