JPH0792067A - Tension testing jig device - Google Patents

Abstract

PURPOSE:To improve a jig for mounting an engine valve and the like which is a test piece on a tension testing machine, and replace the test piece without removing the jig. CONSTITUTION:A window part 15 extending to a cylindrical inner surface 12c and a hole 12b on the bottom part and capable of taking in and out the head part 14a of an engine valve 14 which is a test piece and a handle part 14b continues thereto from the side is formed from the side part to the lower end of the lower jig 12 out of two jigs 12, 13 mutually screwed and used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig device used in a tensile test of a headed work such as an engine valve.

[0002]

2. Description of the Related Art FIG. 3 is a view for explaining an Amsler tensile tester which has been widely used conventionally. This tester measures the yield point, proof stress, tensile strength, elongation, drawing, etc. of the material, and the load is always applied only in the axial direction of the work, that is, the test piece.

As shown in this figure, a cylinder (2) is arranged at the center of the bed (1).
(2) houses the piston (3). This piston (3)
The pivot (5) of the table (4) is inserted in the table. On each side of the table (4), a vertically extending threaded rod
Similarly to (6), one vertically extending pillar (7) is provided, and a total of four columns are provided. In this figure, the screw rod is on the right
(6), the pillar (7) is shown on the left, but there is a pillar behind the right screw rod, and there is a screw rod behind the left pillar.

The screw rod (6) is loosely fitted in the hole (4a) of the table (4) and is rotatably supported by the bed (1). The pillar (7) is independent of the bed (1) and is supported on the table (4). Above this table (4) the screw rod (6) and the pillar (7)
Lower crosshead (8) and upper crosshead (9) between
And are provided. The lower crosshead (8) is screwed into the screw rod (6) at the right end, and is loosely fitted to the column (7) at the left end. It goes without saying that a screw rod (6) is loosely fitted in a pillar (not shown) at the inner part of the drawing, and a screw rod (not shown) is screwed at the inner part of the illustrated pillar (7). Is. On the other hand, the upper crosshead (9) is loosely fitted to the screw rod (6) shown in the figure and fixed to the column (7) shown in the figure, and is attached to the column behind the screw rod (6) on the right side of the figure. It is fixed and loosely fits into the threaded rod behind the left post (7).

Upper crosshead (9) and lower crosshead
At the center of (8), a top (10) and a chuck handle (11) for chucking the top are provided respectively. These pieces are attached with jigs (12) and (13) with the headed work as a test piece, that is, the engine valve (14) set (correctly, the handle part of the jig (13) is on the upper crosshead). The lower crosshead is attached to the handle part of the engine valve).

With such a structure, the cylinder (2)
If hydraulic pressure is applied inside, the piston (5) will rise. The rise of the piston (5) is transmitted from the table (4) to the upper crosshead (9) via the pillar (7), and is fixed between the upper and lower crosshead pieces (10) via a jig. The pulling force is exerted on the valve.

As described above, the engine valve (14) is set and attached to the jigs (12) and (13). This set will be described with reference to FIGS. 4 and 5. The first jig (12) has a cylindrical shape as shown in FIG. 4, has a threaded cylindrical inner surface (12c) that opens at the upper end, and the bottom of which has the head of the engine valve (14). Slope part receiving (14a)
A hole (12b) through which the handle (12a) and the handle portion (14b) of the engine valve pass is provided. The second jig (13) consists of a threaded head portion (13a) screwed onto the cylindrical inner surface (12c) of the first jig (12) and a top end surface (13b) of this head portion. Handle part extending from the center (13
c) and. In the engine valve tensile test, attach the engine valves (14) to the first jig (12) one by one.
It is dropped into the inside, and the second jig (13) is screwed in from above and set in the state of FIG. Next, this second jig (13) is chucked on the top (10) of the upper crosshead (9) of the tester. Then, the lower crosshead (8) is raised and the handle portion (14b) of the engine valve is chucked to the top (10). Finally, the first jig (12) is twisted so that there is no play.

[0008]

The above-mentioned jig mounting process must be repeated for each test piece to be tested, that is, for each engine valve. This requires attachment / detachment of the jig from the testing machine and attachment / detachment of the jigs (12) and (13), so it takes an unexpectedly long time and there is no choice but to spend a long time in preparation for the tensile test. It will be. The object of the present invention is to overcome this drawback of the prior art.

[0009]

SUMMARY OF THE INVENTION The present invention is a jig device for use in a tensile test of a headed work, which is cylindrical and has a lower portion inside the head of the headed work. A first jig having a receiving portion and a hole penetrating the handle portion is formed, and the inner surface of the cylinder is threaded to open upward, and the first jig is screwed to the inner surface of the threaded cylinder. In a tensile test jig device comprising a second jig consisting of a head part and a handle part extending upward from the center of the top end of this head part, from the side part to the lower end of the first jig, A tensile test jig device is characterized in that a window portion is formed so as to reach the inner surface of the cylinder and the hole, and a head portion of the headed work and a handle portion following the head portion can be taken in and out from the side.

[0010]

According to the present invention, the headed work can be easily replaced through the window of the first jig while the jig device is always set in the tester.

[0011]

1 and 2 are diagrams showing an embodiment of the present invention. As shown in FIG. 1, the present invention is a jig device including a combination of jigs (12) and (13). The second jig (13) is substantially the same as the conventional one, but is characterized in that the first jig (12) is provided with a window (15). That is, the first jig (12) has a cylindrical inner surface (12c) screwed into the head portion (13a) of the second jig and the head (14a) of a headed work (14) such as an engine valve. )) And a hole (12b) through which the handle part (14b) of the headed work is inserted, and the side window part (15) extends from the lower part of the cylindrical inner surface (12c) to the jig lower end. Is formed. This window part (15) is a laterally long window part (15a) that is long in the lateral direction and allows the head (14a) of a headed work to pass through to the inside of the cylinder (12c), and the jig from the center of this lateral window part. It is composed of a vertical window portion (15b) through which the handle portion (14b) of the head-like work reaches the lower end and reaches the hole (12b).

Therefore, the head portion (13a) of the second jig (13)
As shown in FIG. 1, the headed work (14) is opened from the side while the bottom end is screwed into the first jig (12) to the extent that it does not reach the lateral window (15a). If inserted in the part (15), this headed work falls into the inside of the cylinder and its head
(14a) abuts the slope (12a) and the handle (14b) has a hole (12b)
Will enter.

Now, mounting of a headed work in a tester using such a jig device will be described below with reference to FIGS. 2 and 3. First, operate the chuck handle (11) with the handle portion (13c) of the second jig (13) of the jig device screwed as shown in FIG. 1 to the top (10) of the upper crosshead (9). To install. Keep the lower crosshead (8) down all the way. From this state, as shown by the arrows in FIGS. 1 and 2, the head-shaped work (14) is moved to the window portion (1) of the first jig (12).
Insert in 5). Next, the lower crosshead (8) is raised, and the handle portion (14b) of the headed work is chucked to the top (10) of the lower crosshead. Then the first jig (12)
Twist to complete the set with no play.

After the tensile test is completed for this head-shaped work, the chuck of the head-shaped work is removed from the lower crosshead (8), and then the lower crosshead is pulled down. In this state, the jig device can remove the headed work while the jig device is still attached to the upper crosshead (9) and insert a new headed work.

[0015]

Since the jig device of the present invention has the above-described structure, the entire jig is removed from the upper and lower crossheads in each conventional tensile test, and the screw engagement of the two jigs is released to remove the test piece. Although the attachment / detachment was performed, it is possible to remove the test piece and attach a new test piece with the jig device still attached to the upper crosshead in a very short time.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a jig device of the present invention and an engine valve as a test piece inserted therein.

FIG. 2 is a front view of a part of the tensile tester, showing a state in which the jig device shown in FIG. 1 is attached to an upper crosshead.

FIG. 3 is a front view of a tensile tester using a conventional jig device.

FIG. 4 is a development view of a jig and an engine valve for explaining a situation in which an engine valve is set in a conventional jig device, and is a diagram showing a part in section.

FIG. 5 is an explanatory view showing a state in which an engine valve is set in a conventional jig device.

[Explanation of symbols]

(1) Bed (2) Cylinder (3) Piston (4) Table (4a) Hole (5) Pivot (6) Screw Rod (7) Pillar (8) Lower Crosshead (9) Upper Crosshead (10) Top ( 11) Chuck handle (12) First jig (12a) Slope (12b) Hole (12c) Threaded cylindrical inner surface (13) Second jig (13a) Head (13b) Top end ( 13c) Handle (14) Engine valve or headed work (14a) Head (14b) Handle (15) Window (15a) Horizontal window (15b) Vertical window

Claims (3)

[Claims] 1. A jig device used when performing a tensile test on a headed work, wherein the jig has a cylindrical shape, and a lower part of the inside penetrates a portion for receiving the head of the headed work and a handle portion. A first jig having a hole formed therein and having a screw threaded on the inner surface of the cylinder to open upward, a head portion screwed to the threaded inner surface of the cylinder and the head portion. In a tensile test jig device comprising a second jig consisting of a handle portion extending upward from the center of the top end of the portion, from the side portion of the first jig to the lower end, the inner surface of the cylinder and the hole. A tensile test jig device characterized in that a window portion is formed so that a head portion of the headed work and a handle portion following the head portion can be taken in and out laterally. 2. The tensile test jig device according to claim 1, wherein a portion for receiving the head portion of the headed work is an inclined surface. 3. The tensile test jig device according to claim 1, wherein the headed work is an engine valve.