JP2002239973A - Test piece picking device and picking method for test piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely manufacture rectangular test pieces with small width dimension without causing quality change. SOLUTION: A thin-blade cutting blade 60 is pushed against sheet pieces S1, S2, S1', and S2' having width of the length dimension of a test piece T to be manufactured, with the blade tip facing downward so as to cut the sheet pieces S1, S2, S1', and S2'. This cutting action is repeatedly performed by feeding a prescribed quantity (quantity of the width of the test piece to be manufactured) of the sheet pieces S1, S2, S1', and S2' so that the cutting surface on which the cutting blade is pushed against the sheet pieces S1, S2, S1', and S2' moves from the free end side of the sheet pieces S1, S2, S1', and S2' to the fixed end side in order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test piece cutting apparatus and a test piece cutting method for cutting a long test piece by cutting a sheet material such as rubber, plastic, and paper.

[0002]

2. Description of the Related Art Conventionally, a test piece made of the above material is cut out by punching a sheet material having a predetermined thickness using a punch cutter having a thin blade. Such a punching cutter is integrally formed by forging, or as disclosed by the present applicant in Japanese Patent Application Laid-Open No. 7-61639, a plurality of (for example, four front, rear, left and right) blades (a razor). The flat shape is formed to be the same shape as the test piece by combining a thin steel blade used as a blade or the like. And the test piece was produced by one punching by pressing the punching cutter formed in this way against a sheet material using a press device. Further, according to the ISO standard, automatic punching (cutting) is strongly recommended from the viewpoint of work efficiency (productivity) and the like for producing such a test piece, and the production of the test piece is automatically performed also in these apparatuses. It has become.

[0003]

However, when a test piece is manufactured by such a punching type apparatus, a compressive force due to the thickness of the blade acts on both sides of the test piece to be punched out. When cutting (cutting out) becomes difficult or plastic deformation occurs in the test piece, and the width of the test piece to be produced is very small (narrow), the dimensional error (variation) increases and the yield rate of non-defective products decreases. There was a problem. For example, ISO974: 2000
The size of the test piece conforming to the standard is 2.50 mm in width and 20 m in length
m, a thickness of 2.5 mm, a very small width of 2.50 mm, and a dimensional accuracy of the width in accordance with ISO standard (ISO 9).
74: 2000) by (2.50 ± 0.05) mm
However, it is difficult for conventional devices to satisfy these requirements. In addition, when the above-described compressive force is applied at the time of punching and manufacturing a test piece, there is a problem that a change in the material called “whitening” occurs and the characteristics of the test material change.

The present invention has been made in view of such a problem, and a rectangular test piece having a small width can be manufactured with high accuracy without causing a change in material. It is an object of the present invention to provide a test piece cutting device and a test piece cutting method capable of improving production efficiency.

[0005]

In order to achieve the above object, a test piece cutting apparatus according to the present invention is a test piece cutting apparatus for cutting a sheet material to cut a rectangular test piece. A base, a cutting table provided on the base so as to be movable in the horizontal direction, and a sheet material provided on the cutting table (for example, the sheet-shaped base material So in the embodiment).
Alternatively, a clamp means (for example, the clamp plate 31 in the embodiment) for fixing and holding one end of the sheet pieces S1, S2)
And a clamp cylinder 32), an elevating means (e.g., an elevating cylinder 41 in the embodiment) for moving the cutting blade holder attached to the lower end positioned above the cutting table so as to move up and down, and the cutting blade holder lowers the cutting edge. A thin blade-shaped cutting blade held so as to face the sheet material, the cutting blade holder is moved down by an elevating means, and the cutting blade is pressed against the sheet material having one end fixed and held by a clamp means to cut the sheet material. The cutting operation is performed while feeding the sheet material by a fixed amount so that the cut surface of the sheet material cut by the cutting blade sequentially moves from the other end (free end) to the one end (fixed end). It is configured to be performed repeatedly.

Further, a method for cutting out a test piece according to the present invention is a method for cutting out a rectangular test piece by cutting a sheet material, wherein a cutting edge is attached to a sheet material having one end fixed and held. The cutting operation of pressing the thin blade-shaped cutting blade held so as to face downward to cut the sheet material is performed by cutting the sheet material cut by the cutting blade from the other end (free end) of the sheet material to the one end. This is repeated while feeding the sheet material by a fixed amount so as to sequentially move toward the (fixed end) side.

In the test piece cutting apparatus and the test piece cutting method according to the present invention, only one end of the sheet material to be cut is clamped and the other end is unconstrained (free). However, the compressive force caused by the thickness of the cutting edge, which was a problem at the time of cutting, does not act on the sheet material, and it becomes difficult to cut even when cutting out a rectangular test piece having a small width dimension, or A large dimensional error does not occur in the cut test piece due to plastic deformation. For this reason, it is possible to efficiently produce a good test piece with good dimensional accuracy and little variation. Further, since no compressive force acts on both sides of the test piece at the time of cutting as in the prior art, no material change such as "whitening" occurs on the cut surface, and the characteristics of the test piece are not impaired.
Further, such a cutting operation can be easily automated, and
The requirements for automatic cutout recommended by the O standard can also be satisfied.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of a test piece cutting device according to the present invention. The test piece cutting apparatus 1 includes a base frame 10a on which a plurality of casters C for movement and jacks J for fixing are mounted at a lowermost portion, and a side frame 10b extending upward from an upper portion of the base frame 10a.
Various devices are disposed on a base 10 having a flat upper frame 10c horizontally supported at an upper end of the side frame 10b and a casing 10d provided on the base frame 10a. It has a configuration.

FIG. 2 is a front view of the apparatus 1 shown in FIG. 1 excluding a casing 10d, and FIG.
It is a side view of this device 1 shown excluding 0d. As can be seen from these figures, a pair of slide guide rails 11, 11 are provided on the base frame 10 a so as to extend horizontally, and a cutting table 20 is horizontally movable on these slide guide rails 11, 11. Installed. A stepping motor 12 is provided on the side of the side frame 10b, and a shaft 13 driven by rotation is provided so as to extend between the slide guide rails 11, 11 in parallel (and thus horizontally). Have been.

On the lower surface side of the cutting table 20, a projecting portion 21 projecting downward is formed, and a thread groove (not shown) made of a female screw is provided here. The thread groove is screwed with a male screw formed on the surface of the shaft 13 to form a ball screw. When the shaft 13 is rotated by the stepping motor 12, the cutting table 20 is moved along the slide guide rails 11, 11. It is possible to send (horizontal movement) with an arbitrary amount. The slide guide rails 11, 1 of the cutting table 20
The position on 1 is detected by a photo sensor (not shown) provided on the side of the cutting table 20.

A clamp plate 31 extends horizontally on the upper surface of the cutting table 20, and pneumatic clamp cylinders 32 for vertically moving the clamp plate 31 are provided on both sides of the cutting table 20. Have been. A clamp switch 74, which is a toggle switch, is provided on the base frame 10a. By operating the clamp switch 74, the clamp cylinders 32, 32 are operated, and the clamp plate 31 is moved.
Is moved downward, and the sheet material S placed on the cutting table 20 can be clamped by being clamped between the placing table 20 and the clamp plate 31 (FIG. 4).
reference).

As shown in FIGS. 2 and 3, a cutting device 40 is mounted on the upper frame 10c. The cutting device 40 includes a pneumatic lifting / lowering cylinder 41 that extends vertically and is installed on the upper surface side of the upper frame 10c.
A lifting member 42 attached to the lower end of the piston rod 41a, a holding head 43 attached to the lower surface of the lifting member 42, a cutting blade holder 44 attached to the lower end of the holding head 43, and cutting. A thin blade-shaped cutting blade 60 held by the blade holder 44 so that the blade edge faces downward;
A guide mechanism for guiding the elevating member 42 so that the cutting blade holder 44 moves up and down smoothly is configured.

The guide mechanism of the cutting device 40 includes two lifting guides 46, 4 formed on the upper frame 10c.
6, two lifting rods 47, 47, which are attached to vertically penetrate these lifting guides 46, and whose lower ends are fixed to the lifting member 42, and which are attached to the upper ends of the lifting rods 47, 47. Attached stopper 48,4
And 8. Both stoppers 48, 48 are used to move the lifting guides 46, 46 when the lifting rods 47, 47 move downward.
The maximum downward movement of the lifting member 42 is restricted by contacting the upper surface of the lifting member 42.

FIGS. 5 to 7 are enlarged views of the cutting blade holder 44 holding the cutting blade 60. FIG. As shown in these figures, the cutting blade holder 44 includes the holding head 4
3, a first support plate 45 attached to the lower end of
A second support plate 46 joined to the lower surface of the first support plate 45; and a pair of holding blocks 47, 4 attached to the lower surface of the second support plate 46 and holding the cutting blade 60.
7 are provided. Handles 45a, 45a are attached to the first support plate 45, so that the first support plate 45 can be easily attached to and detached from the holding head 43. The cutting blade 60 is
Thin like a razor blade (for example, thickness t = 0.3mm)
It is a steel plate-shaped blade (cutter).
The cutting edge extends linearly while being held by the holding members 7 and 47, and the cutting edge protrudes downward from the lower surface of the holding blocks 47 and 47.

A rod support hole 48 vertically penetrating the first and second support plates 45 and 46;
And a spring support hole 4 having an inner diameter larger than the rod support hole 48, which penetrates through each of the holding blocks 47 in a vertical direction in connection with the support block 8.
7a are formed at four places, respectively, and both holes 48,
A guide rod 49 is inserted and attached so as to penetrate 47a. A locking head 49a is attached to an upper end of each guide rod 49, and a knockout plate 50 is attached to a lower end. As shown in FIGS. 6 and 7, two knockout plates 50 are provided in parallel, and each is supported by a pair of left and right guide rods 49 so as to be vertically movable. Each spring support hole 47a is
In addition to the four locations connected to the rod support holes 48, four more locations are provided. The pressing springs 51 inserted into each of the eight spring support holes 47a constantly urge the knockout plate 50 downward. I have. The knockout plate 50 normally causes the locking head 49a of the guide rod 49 to contact the upper end of the rod support hole 48 (that is, the upper surface of the first support plate 45) by the urging force of the pressing spring 51, and It is located slightly below the lower end (state shown in FIG. 7).

As shown in FIG. 2, the base frame 10a
A power distribution panel 70 is installed inside the power distribution panel 70. The power distribution switch 70 is provided with a power switch 71 and a power lamp 72 that is turned on when the power switch 71 is turned on.

Further, as shown in FIG.
A touch panel 80 is provided in the upper right part of d.
The touch panel 80 can be operated by turning on the power switch 71. When the operator performs a touch operation with a finger, the setting of each installed device including adjustment of the driving air pressure of the elevating cylinder 41 and the setting of the cutting mode are performed. It can be carried out. In addition, as shown in FIG.
On the back side of 1, a speed controller 76 composed of a flow control valve for adjusting the flow rate of the air pressure flowing into the lifting cylinder 41 is installed, and the operating speed of the piston rod 41 a in the lifting cylinder 41 is manually operated. Can be adjusted.

Next, a method (procedure) of cutting out a rectangular test piece by the test piece cutting device 1 will be described.
Here, a test piece for embrittlement temperature test having a width of 2.5 mm, a length of 20 mm, and a thickness of 2.0 mm based on the ISO standard (ISO 974: 2000) is sufficient for the dimensions of these test pieces to be produced. An example in which the sheet is cut out from a sheet-like substrate having various dimensions will be described.

First, the power switch 71 is turned on, and it is confirmed that the power lamp 72 is lit. At this point, the cutting device 40 is located at the position moved upward.
After placing a sheet-shaped base material having a width of 60 mm, a length of 60 mm, and a thickness of 2.0 mm at a predetermined position on the cutting table 20, the clamp switch 74 is operated to operate the clamp cylinder 32,
32 is operated, and one end side of the sheet-like base material is fixedly held by the clamp plate 31. At this time, as shown in FIG. 4, an underlaying plate 22 made of the same material as the sheet-like substrate to be cut (or a material equivalent thereto) is laid below the sheet-like substrate (sheet-like shape). The base material corresponds to the sheet material S in FIG. 4).

Next, a start button 73 is pressed. As a result, the lifting cylinder 41 operates to move the cutting device 40 downward, and the cutting blade 60 is pressed against the sheet-like substrate on the cutting table 20 to cut the sheet-like substrate. In this cutting, first, the knockout plate 50 is connected to the cutting device 4.
When the knockout plate 50 is attached to the cutting blade holder 44 via the pressing spring 51, the knockout plate 50 cannot move further downward. Only 60 are both knockout plates 5
It protrudes downward from between 0,50 and bites into the sheet-like substrate. Here, since the cutting blade 60 is a single blade like a thin razor blade, the cut surface of the sheet-shaped base material is a straight surface.

After cutting the sheet-like substrate, the cutting device 40 is moved up and the knockout plate 50 is stopped at a position slightly away from the upper surface of the sheet-like substrate. Subsequently, the stepping motor 12 is driven, and when the cutting table 20 (that is, the sheet-like base material) is fed by an amount (20 mm) corresponding to the length of the test piece to be produced, the cutting device 40 is again moved downward. Then, the sheet-shaped substrate is cut. These series of cutting operations are automatically performed in order from the unclamped side (free end side) of the sheet-shaped base material.
As a result, the cut surface of the sheet base material cut by the cutting blade 60 sequentially moves from the free end side to the fixed end side of the sheet base material.

FIG. 8 is a top view of the cutting table 20 on which the sheet-shaped base material So is fixedly held. The cutting sequence will be described with reference to FIG.
Is cut along the alternate long and short dash line K1 on the free end side, and then the cutting table 20 is fed 20 mm to the left (in the direction of arrow A) in the figure, and then the sheet base So is cut. (The cutting line is the dashed line K2 shown in the figure.) Then, after the cutting table 20 is further fed by 20 mm to the left of the drawing, the sheet-shaped base material So is cut (the cutting line is a dashed line K3 shown in the drawing). This is a preliminary cutting to obtain a test piece having the above specified dimensions, whereby the width is 20 mm and the length is 60 mm.
, Two strip-shaped sheet pieces S1 and S2 are obtained.

Next, the width obtained by the preliminary cutting is 2
Two sheet pieces S1 and S having a length of 0 mm and a length of 60 mm
2 are two sets (in FIG. 9, another set of sheet pieces is denoted by S
1 'and S2'), and as shown in FIG. Then, similarly to the above-mentioned preliminary cutting, the sheet pieces S1, S2, S
Stepping motor 1 from the free end side of 1 ', S2'
2 to drive the cutting table 20 (the sheet pieces S1, S
(2, S1 ', S2') are continuously fed in the direction of arrow A by a fixed amount to perform the cutting operation continuously. This is a sheet piece S1,
In this cutting, a test piece having a predetermined shape is cut out from S2, S1 ', and S2', and the feed amount is the width (2.5 mm) of the test piece T to be manufactured.

The cutting sequence of this cutting will be described in detail with reference to FIG. 9. First, the sheet pieces S1, S2, S
After clamping one end side (right end side in FIG. 9) of 1 ′ and S2 ′ by the clamp plate 31, the sheet pieces S1, S2, S along the two-dot chain line L1 on the other end side (left end side in FIG. 9).
1 ′ and S2 ′ are cut. Subsequently, the cutting table 20 is fed 2.50 mm to the left (in the direction of the arrow B) in the figure, and then the cutting device 40 is lowered so that the sheet pieces S1, S2, S1 ', S
2 'is cut (the cutting line is a two-dot chain line L2 shown in the figure), and thereafter, the sheet pieces S1, S2, S1', and S2 'are continuously cut while being sequentially fed 2.50 mm to the left of the figure. (The cutting lines are the two-dot chain lines L3, L4,.
Ln). Thereby, many rectangular test pieces T having dimensions of 2.50 mm in width, 20 mm in length, and 2.0 mm in thickness are obtained.

As described above, in the present apparatus 1, a step of cutting the sheet-like base material So to obtain sheet pieces S1 and S2;
Further, the sheet pieces S1, S2 (and the sheet pieces S1 ', S
2 ') is performed automatically by the operation of the start button 73, and the emergency stop button 75 is provided on the base frame 10a of the apparatus 1.
The emergency stop button 7 is provided by the operator.
When the user operates No. 5, the cutting operation is interrupted.

As described above, in the test piece cutting apparatus 1 and the test piece cutting method according to the present invention, the sheet material (the sheet base material So or the sheet pieces S1, S2, S1 ') to be cut is used. , S2 '), only one end is clamped and the other end is unconstrained (free), so that the compressive force due to the thickness of the cutting edge, which has conventionally been a problem in cutting, acts on the sheet material. When cutting a rectangular test piece with a small width without cutting, it may be difficult to cut, or a large dimensional error may occur in the cut test piece due to plastic deformation of the sheet material. Absent. For this reason, it is possible to efficiently produce a good test piece with good dimensional accuracy and little variation. Also, since there is no compressive force acting on both sides of the test piece at the time of cutting as in the prior art, there is no material change such as "whitening" on the cut surface,
The properties of the test piece are not impaired. Further, such a cutting operation can be easily automated, and can satisfy the requirement of automatic cutout recommended by the ISO standard.

[0027]

EXAMPLES AND COMPARATIVE EXAMPLES Hereinafter, a rectangular test piece (2.5 mm in width, 2.5 mm in width) for an embrittlement temperature test based on the ISO standard (ISO 974: 2000) using the test piece cutting device of the present invention.
The results (Examples) in the case of cutting out a sample having a length of 20 mm and a thickness of 2.0 mm) are shown together with the results (Comparative Examples) in the case where test pieces of the same shape were obtained by a conventional apparatus. In Comparative Example 1, a rectangular frame punching blade was used, and in Comparative Example 2, a single punching blade was used. Further, the sheet-shaped base material to be cut had a sufficient length and width with respect to the dimensions of the test piece to be produced (width 60 mm × length 60 mm).
A 0 mm one was used and the material was polypropylene.

FIG. 10 shows the results obtained by cutting such a sheet-like substrate according to the above procedure to obtain a large number of test pieces having a predetermined shape. As can be seen from this table, the average value of the width of the test piece in the example is 2.50 mm, and the standard deviation is 0.02 mm.
mm, which is defined by ISO (2.50 ± 0.0
5) The requirement of mm was satisfied. Also, after one day, the cut surface of each test piece was visually observed,
No whitening was observed. When the embrittlement temperature was further examined, the average value was -31 ° C and the standard deviation was 3 ° C. The dispersion of the embrittlement temperature was small, and a good result was obtained as a test piece.

On the other hand, in Comparative Example 1, the average value of the width of the test piece was 2.49 mm, and the standard deviation was 0.07 mm, which did not satisfy the above-mentioned ISO standard. In addition, whitening was remarkably recognized on the cut surface of each test piece. Further, the embrittlement temperature was −30 ° C., and the standard deviation was 15 ° C., and the variation was large, so that it could not be said that the test piece had a good result. Further, in Comparative Example 2, the average value of the width of the test piece was 2.50 mm, and the standard deviation was 0.06 mm, which did not satisfy the above ISO standard. Whitening was observed on the cut surface of each test piece, the embrittlement temperature was −30 ° C., and its standard deviation was as large as 10 ° C., which was not a good result as a test piece.

[0030]

As described above, in the test piece cutting device and the test piece cutting method according to the present invention,
Since only one end of the sheet material to be cut is clamped and the other end is unconstrained (free), the compressive force due to the thickness of the cutting edge, which has conventionally been a problem at the time of cutting, is reduced. When cutting a rectangular test piece with a small width without cutting, it may be difficult to cut or a large dimensional error may occur in the cut test piece due to plastic deformation of the sheet material. Absent. For this reason, it is possible to efficiently produce a good test piece with good dimensional accuracy and little variation. Further, since no compressive force acts on both sides of the test piece at the time of cutting as in the prior art, no material change such as "whitening" occurs on the cut surface, and the characteristics of the test piece are not impaired. Further, such a cutting operation can be easily automated, and can satisfy the requirement of automatic cutout recommended by the ISO standard.

[Brief description of the drawings]

FIG. 1 is a front view of a test piece cutting device according to the present invention.

FIG. 2 is a front view of the present apparatus without a casing.

FIG. 3 is a side view of the present apparatus without a casing.

FIG. 4 is a perspective view of a cutting table in which a sheet material is fixed and held on an upper surface side.

FIG. 5 is a partial cross-sectional side view of the cutting blade holder holding the cutting blade.

FIG. 6 is a bottom view of the cutting blade holder holding the cutting blade.

FIG. 7 is a front view of the cutting blade holder holding the cutting blade.

FIG. 8 is a plan view of a cutting table in a state in which the sheet base is fixed and held, illustrating a cutting order of the sheet base.

FIG. 9 is a plan view of a cutting table in a state where two sets of two sheet pieces obtained by preliminary cutting are fixed and held.

FIG. 10 is a table showing the results of Examples obtained using the present apparatus and Comparative Examples 1 and 2 obtained using the conventional apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 test piece cutting device 10 base 20 cutting table 31 clamp plate (clamp means) 32 clamp cylinder (clamp means) 40 cutting device 41 elevating cylinder (elevating means) 44 cutting blade holder 60 cutting blade So sheet-like base material (sheet) Material) S1, S2 Sheet piece (sheet material)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiji Watanabe 1F, Anesaki Beach, Ichihara-shi, Chiba 1F F-term (reference) 3C021 BB04 CA01 3C027 JJ08 JJ11 JJ14

Claims (2)

[Claims] 1. A test piece cutting device for cutting a sheet material to cut out a rectangular test piece, comprising: a base; a cutting table provided on the base so as to be movable in a horizontal direction; Clamping means provided on a table to fix and hold one end of a sheet material; Elevating means for elevating and lowering a cutting blade holder attached to a lower end positioned above the cutting table; and a cutting blade holder. A thin blade-shaped cutting blade held so that the blade edge faces downward, and the cutting blade holder is moved downward by the elevating means,
The cutting operation of pressing the cutting blade against the sheet material, one end of which is fixed and held by the clamping means, and cutting the sheet material, the cutting section of the sheet material cut by the cutting blade is the other end of the sheet material. A test piece cutting device configured to repeat the feeding while feeding the sheet material by a predetermined amount so as to sequentially move from the side toward the one end side. 2. A method for cutting a test piece for cutting a sheet material to cut out a rectangular test piece, comprising: a thin blade-shaped sheet material having one end fixedly held and a blade edge held downward. The cutting operation of pressing the cutting blade to cut the sheet material is performed such that a cut surface of the sheet material cut by the cutting blade sequentially moves from the other end side of the sheet material toward the one end side. A method for cutting out a test piece, wherein the method is repeated while feeding a predetermined amount of material.