JPH09113424A - Notch working apparatus for test piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a notch working apparatus by which a uniformly deep notch can be worked on a test piece precisely and easily by a method wherein, in a state that the test piece is held, a holder is slid in a state that it is guided by the side face of a laser member block. SOLUTION: In a laser member body 3 whose cross section is formed to be L-shaped, a laser blade part 1 in which a blade part is formed to be an arc shape is fixed to the laser member body 3 by a plurality of bolts 2a in such a way that it protrudes by a prescribed height H from the surface by a fixation member 2 along the center line CL. In this state, a test piece P is inserted into a holder 4, a stopper 8 is set in a prescribed position by a bolt 9, the holder 4 is guided by a protrusion at a guide member 6, the holder is slid on the laser blade part 1 at the laser member body 3, and a notch can be formed on one face of the test piece P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser notch processing device for a plastic material test piece.

[0002]

2. Description of the Related Art When a leather notch is formed on a surface of a plastic strip-shaped (rectangular parallelepiped) test piece with a leather blade portion, conventionally, as shown in FIG. 6, for example, as shown in FIG. The blade of a specified height was taken out from the jig for fixing the leather blade, which was fixed by the fixing member 32, and the notch was processed by pressing the test piece from above.

[0003]

However, in the above technique, there is a problem that the test result data by the test piece becomes inaccurate and non-uniform due to the following reasons.

(1) The notch depth varies.

(2) The intersection angle between adjacent notch bottoms does not become 90 degrees.

(3) The notches between the adjacent surfaces are displaced (in the case of the full circumference notch, the notch 33a in FIG.
33b).

(4) When the test piece is pressed against the razor blade 31, orientation (phenomenon in which the molecular axes are oriented in the same direction) occurs at the notch bottom, and the notch bottom hardens or the radius of curvature of the notch bottom increases. Etc., and unfavorable results occur.

The present invention has been proposed in view of the problems of the prior art as described above, and it is possible to accurately and easily machine a notch having a uniform depth in a strip-shaped (rectangular parallelepiped) test piece. The purpose is to provide a notch processing device.

[0009]

According to the notch processing apparatus for a test piece of the present invention, an arc-shaped leather blade portion is projected along a center line at a substantially central portion in a longitudinal direction on one surface of a block formed in a rectangular parallelepiped. And a test piece holder having a U-shaped cross section which is guided by the side surface of the block and is slidable on one surface of the block in a manner orthogonal to the block. The holder is provided with a holding means for holding the test piece, a stopper for positioning the test piece in the longitudinal direction of the holder, and a guide member for guiding along the side surface of the block.

According to the notch processing apparatus for a test piece of the present invention having such a structure, the test can be performed by sliding the holder while holding the test piece while being guided by the side surface of the block of the razor member. The notched portion of the one-sided holder is cut by the arc-shaped leather blade.

Here, when a conventional leather blade is used, the base of the leather blade comes into contact with the test piece, so that the test piece holder slides (slides) so as to pass through the leather blade. It was impossible to make them. However, according to the present invention in which the razor blade portion is formed in an arc shape, only the razor blade portion directly contacts the test piece, so that the notch cutting operation is performed without obstructing the sliding of the holder. Further, as a result of the test piece sliding on the arc-shaped leather blade portion, the sharpness of the leather blade portion becomes very good.

After the notch is formed on one surface of the test piece, the test piece is pulled out from the holder once and the other surface faces the leather blade portion (so that the notch processing is performed). Change the orientation of one side and insert it again in the holder. When this is repeated to form notches on the entire circumference of the test piece, since the relative positional relationship between the test piece holder and the razor blade portion is always the same, adjacent notches do not shift as shown in FIG. .

In carrying out the notch processing apparatus for a test piece of the present invention, the test piece holder having a U-shaped cross section has the same inner surface dimension as that of a test piece having a quadrangular (for example, square) cross section. It is preferable that the test piece is configured so that it can be inserted and has a holding means for holding the test piece in the test piece holder. However, the cross-sectional shape of the test piece is not limited to a square shape, and may be another quadrangular shape.

Alternatively, in the notch processing apparatus for a test piece of the present invention, the test piece holder having a U-shaped cross section is provided with restraining members on two adjacent inner surfaces thereof, and the restraining member is the test specimen holder. It is configured to be adjustable so as to bring the two inner surfaces and the two adjacent surfaces of the test piece into close contact with each other, and the end portion of the test piece holder is configured to be bendable at a position close to the holding member. Is preferred.

Even if the size of the test piece is wide, it can be adjusted by the restraining member.
It is possible to always respond. Further, as a result of the end portion of the test piece holder being bendable, the labor required for inserting the test piece into the holder is reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a notch processing apparatus according to the present invention, in which a blade portion is formed in an arc shape on a body 3 of a leather member having an L-shaped cross section. The razor blade 1 is fixed to the main body 3 by a plurality of bolts 2a along the center line CL by the fixing member 2 so as to protrude from the upper surface by a predetermined dimension H.

Referring also to FIG. 2, the test piece holder, which holds the test piece P in its entirety, is designated by the reference numeral 4, the main body 5 is formed in a U-shaped cross section, and the inside of the main body 5 is inserted into the test piece P. At this time, the end surface 5b of the opening and the one surface of the test piece P are flush with each other and are formed so as to be inserted without play. Further, guide members 6, 6 are fixed to both outer sides of the flange portion of the main body 5, and the guide member 6 is provided with projections 6a, 6a at the ends thereof. It is formed to be equal to the distance D on the side surface parallel to the leather blade portion of the leather member. An escape groove 7 of the leather blade portion 1 is provided in the middle of the protrusion 6a.

A groove 11 is provided in the web portion of the main body 5, and a tongue portion 8a of a stopper 8 for positioning the test piece P in the longitudinal direction is movably inserted into the groove 11 and the stopper 8 is provided. Is the main body 5 with the bolt 9 through the long hole 7a.
Is configured to be fixed to. Note that signs 5a and 7b
Indicate scales and guidelines, respectively. Further, a leaf spring 10, which is a holding means for holding the test piece P, is fixed to the end of the main body 5 on the opening side.

The operation will be described below. The leather blade 1 is attached to the body 3 of the leather member at a predetermined height H (for example, 0.2 m).
m) is projected and fixed, the test piece P is inserted into the holder 4, the stopper 8 is set at a predetermined position by the bolt 9,
Guide the holder 4 by the projection 6a of the guide member 6,
By sliding on the leather blade 1 of the body 3 of the leather member,
A notch can be made on one side of the test piece.

When the test piece P has a square cross section and is to be notched all around, the test piece P is pulled out from the holder 9
It may be rotated by 0 ° and inserted into the holder 4 until it abuts on the stopper, and similarly slides on the body 3 of the razor member.
By repeating the above steps, notches can be formed on the entire circumference, and the positions where the notches are formed are determined by the stopper 8, so the notches do not shift. Also, since the test piece slides over the arcuate blade, it cannot be pressed by the leather blade as in the conventional method, so that orientation does not occur and the notch bottom is sharp. Can be machined to a certain depth.

As a result, for example, as shown in Table 1, the variation of the Charpy test data becomes extremely small, and the reliability of the test data is improved.

Table 1 FIG. 3 is a plan view showing an example of a second embodiment of the present invention, and FIG. 4 is a side view thereof. The holder main bodies 15 and 15a, which are indicated by reference numeral 14, are connected by a hinge 26 so as to be bendable. ing. The guide member 16 having the protrusions 16a and 16a is fixed to one side surface (lower side in the figure) of the main body 15 with screws 27, and the other side surface (upper side in the figure) is fixed to the main body 1.
It is fixed by a bolt 18 via a stopper 18 that is movable in the longitudinal direction of 5 (left-right direction in the drawing).

At the end of the opening surface of the main body 15 near the center of the guide member, two rib-shaped projections 15b for positioning the test piece P at the end are connected to the flange end of the main body 15. A holding member 23 fixed to the inside of the flange of the main body 15 and a holding member 24 whose position is adjustable by an adjusting screw 24a are provided so as to face each other, and the test piece P is placed in the direction of the rib-like protrusion 15b. A holding member 25 is provided whose position can be adjusted by an adjusting screw 25a which is moved and positioned.

Further, as shown in FIG. 5, the above holder 1
The main body 13 for fixing the razor blade 1 used in combination with 4 and the upper surface of the fixing member 12 are provided with escape grooves 13a for the projections 15b.

Therefore, the bending member 15a of the holder main body 15 is bent as shown by A, the test piece P is inserted, the test piece is positioned by the adjusting screws 24a, 25a and the stopper 18, and the fixing member 13 of the laser blade portion is fixed. By sliding, the notch can be formed on one side of the test piece, and the notch can be formed on the entire circumference by repeating the same operation.

Further, while the first embodiment is configured to correspond to the case where the test piece has a square cross section,
It can also be applied when the cross-sectional shape of the test piece is rectangular.

Furthermore, since the holder main body 15 can be bent, the test piece can be easily inserted into and removed from the holder.

[0029]

The present invention is configured as described above,
The excellent effects as listed below can be achieved. (1) By drawing the notch, it is possible to make a sharp notch with a constant depth. (2) When notching is made on the entire circumference, notching can be easily and accurately performed. (3) The test piece can be square or rectangular in cross section.

[Brief description of the drawings]

FIG. 1 is a perspective view of a notch processing device showing an example of an embodiment of the present invention.

FIG. 2 is a perspective view showing a lower surface of the holder shown in FIG.

FIG. 3 is a plan view showing a holder according to a second embodiment of the present invention.

FIG. 4 is a side view of the holder shown in FIG.

FIG. 5 is a perspective view showing an example of a second embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional razor blade portion and its fixing portion.

FIG. 7 is a perspective view showing an example of problems of the conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Leather blade part 2, 12, 32 ... Fixing member 3, 13 ... Main body 4, 14 ... Test piece holder 5, 15 ... Holder main body 6, 16 ... Guide member 7 , 13a ... Escape groove 8, 18 ... Stopper 11 ... Groove 23, 24, 25 ... Holding member CL ... Center line P ... Test piece

Claims (3)

[Claims] 1. A razor member having an arcuate razor blade protruding and fixed along a center line at a substantially central portion in a longitudinal direction on one surface of a block formed in a rectangular parallelepiped, and a block guided by a side surface of the block. A test piece holder having a U-shaped cross-section slidably formed on one surface of the test piece holder in such a manner that the test piece holder holds the test piece, and a test piece. A notch processing device for a test piece, comprising: a stopper that positions the holder in the longitudinal direction of the holder; and a guide member that guides the side surface of the block. 2. A test piece holder having a U-shaped cross section is configured such that the inner surface of the test piece holder has the same size as the cross section of a test piece having a quadrangular cross section and the test piece can be inserted therein. The notch processing device for a test piece according to claim 1, further comprising a holding means for holding the test piece in the test piece holder. 3. A test piece holder having a U-shaped cross section is provided with a restraining member on each of two adjacent inner surfaces thereof, the restraining member being adjacent to the two surfaces inside the test strip holder. The test piece notch processing device according to claim 1, wherein the test piece holder is configured so that it can be brought into close contact with the two surfaces, and the end portion of the test piece holder can be bent at a position close to the holding member.