JP2820838B2 - Jig for notched test piece production leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notched test piece used to evaluate the creep performance of a pipe by applying a constant tensile load to a rod-shaped (strip-shaped) test piece having a notch all around. The present invention relates to a jig for manufactured leather.

[0002]

2. Description of the Related Art One of the tests for evaluating the long-term mechanical performance of a plastic is a notch type tensile creep test method (hereinafter, referred to as "FNCT"). The test piece used in this test method includes a strip test piece a having a notch b all around as shown in FIG. 3 (a thin, sharp blade is provided at the center of the strip-shaped test piece, perpendicular to the long axis direction of the strip). Notched perimeter) is used.

In order to apply the notch b to the test piece a, usually, A
A slightly improved tool (FIG. 4) for producing an environmental stress crack test specimen of STM (D1693) is often used. In this tool, the leather 1 is gripped by being sandwiched between the metal jig 2 and the fixing portion 4, and the cutting edge 1 a is protruded from the adjustment surface 3 to a desired notch depth, and the screw 5 is removed.
Screw set. When the test piece a is pressed onto the cutting edge 1a, a notch b having a depth corresponding to the protruding cutting edge 1a is formed on the test piece a.

[0004] The width of the strip-shaped test piece of the FNCT is 2 to 20 mm because the pipe wall pressure is used as it is. The depth of the notch b to be applied is defined by the width of the test piece a (1/6 of the test piece width, that is, 0.3 to 3.3 mm), and the cutting edge 1a protrudes from the adjustment surface 3 in this range. The length (height) must be freely adjustable. Normally, the screw 5 of the fixing portion 4 of the leather 1 is loosened, the leather 1 is pinched with tweezers, taken out of the jig, and the blade length is adjusted to the specified length.

[0005] The length is measured by an electro-controller (height measuring device) and adjusted within ± 0.05 mm.

[0006]

However, in actual work, the length of holding the leather 1 is required to be about 1 mm and the dexterity of the hand is required (less than 1 mm and parallel to the adjustment surface 3 of the jig). Setting the cutting edge 1a at a position requires very skill).

[0007] The width of the leather 1 is about 20 mm in the case of the ASTM jig. Therefore, the groove width of the test piece a is almost the maximum width of the test piece a to be handled, and it is difficult to apply the notch b.

SUMMARY OF THE INVENTION An object of the present invention is to provide a notch-equipped leather jig for making a notched test piece, which can easily adjust the length and level of the blade edge and can easily perform the notched work. .

[0009]

Means for Solving the Problems The constitution of the leather jig for producing a notched test piece according to the present invention is as follows.

A horizontal adjustment surface is formed on the upper surface, and a laser fixing member fitting step portion is provided on the front side, and an adjustment guide groove is provided at the center lower portion of the step portion so that the leather mounting member is fitted vertically. A jig body that forms a space, a leather mounting member that is mounted in the adjustment space movably up and down, wherein the razor is attached upward, and the protrusions on both sides are engaged with the adjustment guide grooves of the jig body, Fitted to the step of the jig body,
In order to be able to squeeze the razor against the pressure contact surface formed on the front side of the step portion, a razor fixing member attached to the jig main body with a screw, and a bottom plate below the adjustment space of the jig main body. A notch depth adjusting screw formed by screwing a screw provided at the lower part of the shaft into a screw hole provided on both sides, an upper end of the shaft abutting against a lower surface of the razor mounting member, and fixing a turntable to the shaft. , A jig for producing leather with a notch.

[0011]

The razor is attached to the razor attachment member using screws or the like so that the length (height) of the cutting edge is sufficiently extended. The member to which the leather is attached is fitted into the adjustment space of the jig body so as to be adjustable up and down by using engagement between the guide grooves on both sides and the protrusion. At this time, the upper end of the notch depth adjusting screw is in contact with the lower surface of the razor mounting member to support the razor mounting member. Next, a leather fixing member is attached to the step portion of the jig body using a screw, and the laser fixing member is tightened by tightening the screw so that the pressurizing surface is placed between the leather and the pressing surface on the jig body side is pressed. Crimp. As a result, the razor can be clamped and fixed. The length of the razor blade protruding from the adjustment surface is once loosened by loosening the razor fixing member, and turning the notch depth adjustment screws on the left and right, for example, to the right, so that the notch depth adjustment screws It rises upward in relation to the provided screw, the leather mounting member rises by this action,
The cutting edge comes out of the adjustment surface. The cutting edge is adjusted with the left and right notch depth adjustment screws so as to be parallel to the adjustment surface, and when the adjustment is completed, the screw of the leather fixing member is tightened to fix the leather. Conversely, when retracting the cutting edge of the razor, if the razor fixing member is loosened and the left and right notch depth adjusting screws are turned in the pressure direction, the razor mounting member and the razor descend together with their own weight. The fixing means of the razor after the cutting edge is retracted by a predetermined amount is the same as described above. The use example of the jig for forming the notch is the same as the conventional example.

[0012]

1 is an exploded perspective view of a jig according to the present invention.

Reference numeral 10 is a jig body, 11 is an adjustment surface, 1
2 is a fitting step formed on the front side of the jig body 10, 13 is an adjusting space formed below the center of the fitting step 12, 14, 1
4a is a guide groove, 15 is a razor mounting member, and the razor 1 is fixed to a mounting portion 15a of the mounting member 15 with screws 1b, and the mounting member 15 has projections 17 and 17a on both sides thereof.
Are slidably fitted in the guide grooves 14 and 14a, thereby being mounted in the adjustment space 13 of the jig body 1.

Reference numeral 18 denotes a laser fixing member fitted into the fitting step portion 12 of the jig main body 1.
Is a pressing surface 18 which presses against the pressing surface 10a on the jig body 10 side.
a and the adjustment surface 19, which is the same as the adjustment surface 11, can be formed on the upper surface, and can be fixed with the fixing screws 20, 20a.

A fixing screw 29 is provided on the bottom surface of the jig body 10.
And 29a, the bottom plate 2
1 is provided with screw holes 22, 22a.

The notches 23, 23a are notch depth adjusting screws, and the adjusting screws 23, 23a are fixed to the shafts 24, 24a, the screws 25, 25a fitted into the screw holes 23, 23a, and the shafts 24, 24a. Fixed plates 26 and 26a and shaft 2
4, 24a, the upper ends 27, 27a.
The laser mounting member 15 is supported from below by 7a.
28 and 28a are clearance angles; 29 and 29a are fixing screws for attaching the bottom plate 21 to the lower surface of the jig body 10;
Reference numerals 0 and 30a are fixing screw holes.

FIG. 2 is a perspective view showing a state where the jig is assembled. This assembly is performed as follows. First,
The razor 1 is attached to the attaching portion 15a of the razor attaching member 15 by using a screw 1b so that the length (height) of the cutting edge 1a is sufficiently extended. Member 1 with leather 1 attached
5 is a guide groove 1 on both sides in the adjustment space 13 of the jig body 1.
The upper and lower slides can be freely adjusted by using the engagement between the projections 4 and 14a and the projections 17 and 17a. At this time, the upper ends 27, 27a of the notch depth adjusting screws 23, 23a are in contact with the lower surface of the razor mounting member 15, and support the razor mounting member 15 from below. Next, a screw 20 is attached to the step 12 of the jig body 1.
The leather fixing member 18 is attached using 20a,
By pressing the screws 20, 20a, the pressing surface 18a of the razor fixing member 18 presses against the pressing surface 10a of the jig body 10 with the razor 1 interposed therebetween. As a result, the razor 1 can be clamped and fixed, and the cutting edge 1a of the razor 1 can be fixed.
The length protruding from the adjusting surfaces 11 and 19 loosens the laser fixing member 18 once, and the right and left notch depth adjusting screws 23 and 23
a, for example, by turning it clockwise, the screws 25, 2 provided in the screw holes 22, 22a of the bottom plate 21 and the shafts 24, 24a.
5a, and the razor mounting member 15 is raised by this action, and the cutting edge 1a comes out of the adjustment surfaces 11, 19. Cutting edge 1
a is adjusted with the left and right notch depth adjusting screws 23, 23a so as to be parallel to the adjusting surfaces 11, 19, and when the adjustment is completed, the screws 20, 20a of the leather fixing member 18 are tightened to fix the leather 1. I do. Conversely, the edge 1 of leather 1
When retracting a, loosen the leather fixing member 18,
When the left and right notch depth adjusting screws 23 and 23a are turned to the left, the razor mounting member 15 and the razor 1 are lowered together by their own weight. When the laser 1 is fixed after the cutting edge 1a is retracted by a predetermined amount, the screw 20 and 20a of the laser fixing member 18 are tightened again.

By assembling the jig as described above, adjusting the cutting edge 1a, and pressing the test piece onto the cutting edge 1a, the cutting edge 1a protruding from the adjustment surfaces 11, 19 is formed.
You can make a notch with a depth of minutes. The condition of the notched test piece is the same as that in FIG.

[0019]

As described above, the jig according to the present invention has the above-described structure and operation, and therefore, it is possible to extremely easily adjust the protrusion length of the laser in the range of 0.3 mm to 3.3 mm. Also, by setting the groove of the test piece to 40 mm,
Using a long leather width (for example, a hard leather replacement blade for shaving, a blade width of about 35 mm), a notch can be formed while rolling the test piece so as not to be removed from the leather. Accordingly, a notch having a depth defined for each test piece can be easily formed even if the test piece dimensions are different. In addition, the time required for replacement and adjustment when the razor blade is damaged is greatly reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a jig according to the present invention.

FIG. 2 is a perspective view showing a state where a jig is assembled.

FIG. 3 is an explanatory view of a test piece.

FIG. 4 is an explanatory view of a conventional notch forming jig.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Jig main body 12 Fitting step 13 Adjustment space 15 Leather mounting member 18 Leather fixing member 21 Bottom plate 22, 22a Screw hole 23, 23a Notch depth adjusting screw 25, 25a Screw

Claims (1)

(57) [Claims] 1. A horizontal adjusting surface is formed on an upper surface, and a razor fixing member fitting step is provided on the front side, and an adjusting guide groove into which a razor mounting member is vertically movably fitted is provided at the lower center of the step. A jig main body having an adjustment space formed therein, and a razor mounting member which is mounted in the adjustment space so that the razor is mounted upward, and the protrusions on both sides are engaged with the adjustment guide grooves of the jig main body. And a laser fixing means which is fitted to the jig body by screws so as to be fitted to the step part of the jig body and to be able to squeeze the razor against a pressure contact surface formed on the front side of the step part. The member and the screw provided at the lower part of the shaft are screwed into the screw holes provided on both sides of the bottom plate below the adjustment space of the jig main body, and the upper end of the shaft comes into contact with the lower surface of the razor mounting member. Notch depth adjustment by fixing the turntable A jig for a leather for preparing a notched test piece, comprising: a screw;