JP3849331B2 - Material testing machine - Google Patents

Material testing machine Download PDF

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Publication number
JP3849331B2
JP3849331B2 JP34709098A JP34709098A JP3849331B2 JP 3849331 B2 JP3849331 B2 JP 3849331B2 JP 34709098 A JP34709098 A JP 34709098A JP 34709098 A JP34709098 A JP 34709098A JP 3849331 B2 JP3849331 B2 JP 3849331B2
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axis
arc surface
collar
adjusting
grip
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JP2000171366A (en
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徳晃 小嶺
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Shimadzu Corp
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Shimadzu Corp
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【0001】
【発明の属する技術分野】
本発明は、供試体を把持する把持部材の軸芯調整装置を具備する材料試験機に関する。
【0002】
【従来の技術】
従来、例えば図7に示すように、基台1上に一対の支柱3を立設させ、そこにクロスヘッド2を横架して成る負荷枠体内に供試体4を設置し、アクチュエータ5により供試体4に負荷を与えながらロードセル6と差動トランス等の変位検出器7とによって荷重と変位とを測定し、供試体4の荷重−変位特性を求める材料試験機が知られている。このとき、供試体4は上下グリップ8,9で把持されるが、グリップ8,9の軸芯が合っていないと正確な試験が行えない。そのため、従来は、特開平2−203241号公報に開示されているような球面軸受や図8(a)に示すような傾斜板10、11を介してグリップ8をクロスヘッド2に取り付け、グリップ8の軸芯が垂直(負荷の作用方向)になるように調整できるようにしている。
【0003】
傾斜板10,11の中心には、図8(b)の斜視図に示すように孔10a,11aがそれぞれ形成されている。グリップ8は、クロスヘッド2とグリップ8との間に傾斜板10,11を挟持するようにクロスヘッド2に取り付けられる。このとき、グリップ8の取付軸8aは傾斜板10,11の孔10a,11aを貫通して取付板12に螺合しており、ジャッキボルト13を用いて取付板12をクロスヘッド2に対して上方に引き上げることにより、グリップ8を所定の力でクロスヘッド2に締結する。
【0004】
図8(b)のJ1は傾斜板10の面10bの法線を示しており、傾斜板10を垂直軸zに関して回転すると、面10bの法線J1は図のようにZ座標軸の回りに回転する。一方、図8(c)に示すように、傾斜板11の斜面11bと傾斜板10の斜面10bとの接触を保ったまま傾斜板11を回転させると、傾斜板11は法線J1を回転軸として回転する。そのため、グリップ8が固定される面11cの法線J2は、法線J1の回りに回転する。すなわち、傾斜板10を回して軸芯の方向を変え、傾斜板11を回して軸芯の傾き調整を行う。
【0005】
【発明が解決しようとする課題】
ところで、傾き調整を行うときには、ジャッキボルト13をいったん緩めて各傾斜板10,11の回転角度を各々調整し、再度ジャッキボルト13を締め付けて固定する。しかし、ジャッキボルト13を再度締め付ける際に、傾斜板10,11の回転角度が設定位置からずれてしまうおそれがあり、調整に手間取るという欠点があった。また、傾斜板10,11自体の位置がずれている場合には、傾斜板10,11全体の取付位置を移動させる必要がある。一方、球面軸受を用いて調整を行う場合には、軸受の球面加工が難しいため装置が高価になるという欠点がある。
【0006】
本発明の目的は、把持部材の軸芯調整を比較的安価に、かつ、容易に行うことができる軸芯調整装置を備える材料試験機を提供することにある。
【0007】
【課題を解決するための手段】
発明の実施の形態を示す図1、図2および図5に対応付けて説明する。
(1)請求項1の発明は、負荷枠2に固設されて供試体4を把持する把持部材8の軸芯を調整する軸芯調整装置20を備える材料試験機に適用され、軸芯調整装置20は、第1の円弧面211aを有し、負荷枠2との相対位置が一定な第1の部材201aと、第2の円弧面211bを有し、把持部材8が固定される第2の部材201bと、第1の円弧面211aに嵌合するように接触する第3の円弧面212および第2の円弧面211bに嵌合するように接触する第4の円弧面213を有する第3の部材202と、第1の円弧面211aを含む円筒状曲面の中心軸J6を回転軸とする、第1の部材201aに対する第3の部材202の回転角度を調整する第1の角度調整部材203a、203bと、第2の円弧面211bを含む円筒状曲面の中心軸J7を回転軸とする、第3の部材202に対する第2の部材201bの回転角度を調整する第2の角度調整部材205a,205bと、負荷枠2に対する第3の部材202の位置を第1の方向(Y座標軸方向)に調整する第1の位置調整部材204a,204bと、第3の部材202に対する第2の部材201bの位置を第1の方向と異なる第2の方向(X座標方向)に調整する第2の位置調整部材206a,206bとを備えて上述の目的を達成する。
【0008】
なお、本発明の構成を説明する上記課題を解決するための手段の項では、本発明を分かり易くするために発明の実施の形態の図を用いたが、これにより本発明が発明の実施の形態に限定されるものではない。
【0009】
【発明の実施の形態】
以下、図1〜図6を参照して本発明の実施の形態を説明する。図1は本発明による材料試験機の一実施の形態を示す図であり、試験機本体の概略構成を示す図である。図1では図7,8と同一部分には同一の符号を付し、異なる部分を中心に説明する。図1において、グリップ8は軸芯調整装置20を介してクロスヘッド2に取り付けられる。なお、図1ではロードセルは省略して示した。
【0010】
図2は軸芯調整装置20の詳細を示す図であり、(a)は図1の正面から見た断面図であり、(b)は(a)のA−A’断面図である。また、図3は軸芯調整装置20をクロスヘッド2側から見た平面図である。軸芯調整装置20はボディ202と、ボディ202を上下から挟むように配置される一対のカラー201a,201bを備えており、カラー201aの軸芯調整はボルト203a,203b,204a,204bを用いて行われ、カラー201bの軸芯調整はボルト205a,205b,206a,206bを用いて行われる。
【0011】
グリップ8をクロスヘッド2に取り付ける際には、グリップ8に設けられたロッド21がカラー201a,201bおよびボディ202に形成された孔H1,H2を貫通するようにカラー201b,ボディ202およびカラー201aをクロスヘッド2との間に挟み、さらに、ロッド21の先端部分に取付板22を取り付ける。そして、ジャッキボルト23によりグリップ8を図示上方に所定の力でジャッキアップしてクロスヘッド2に固定する。
【0012】
図4はカラー201aの斜視図であり、カラー201aは角柱の側面の一つを曲率半径Rの凸状円弧面211aに形成した柱状部材であり、カラー201aの場合には円弧面211aを下方に向けて配設される。また、カラー201bはカラー201aと同一形状を有しており、カラー201bの場合には円弧面211bを上方に向けて配設される。なお、カラー201bに関する符号201b,211bは括弧付きで示した。ここで、図4の矢印の方向をカラーの長手方向と名付けたとき、図2に示すようにカラー201aの長手方向とカラー201bの長手方向とが直交するように配設される。すなわち、カラー201aの長手方向はY座標軸と平行であり、カラー201bの長手方向はX座標軸と平行になっている。図4の一点鎖線220で示す曲面は円弧面211a(211b)が含まれる半径Rの円筒状曲面を表している。
【0013】
図3の平面図に示すように、カラー201aに関しては、X座標軸方向に傾き調整用ボルト203a,203bが設けられ、Y座標軸方向にY方向位置調整用ボルト204a,204bが設けられる。例えば、ボディ202をY座標のプラス方向に調整(移動)する場合には、ボルト204aを緩めるとともにボルト204bを締め付ける。逆に、マイナス方向に調整する場合には、ボルト204bを緩めるとともにボルト204aを締め付ける。なお、軸の傾き調整については後述する。一方、図2からも分かるように、カラー201aと直交するように配設されるカラー201bに関しては、Y座標軸方向に傾き調整用ボルト205a,205bが設けられ、X座標軸方向にX方向位置調整用ボルト206a,206bが設けられる。
【0014】
図2に示すように、カラー201aの円弧面211aと接触するボディ202の面212の形状は、円弧面211aと同一の曲率半径Rを有する凹状の円弧面を成し、カラー201bの円弧面211bと接触する面213は、円弧面212と90度方向が異なるが同様の凹状円弧面を成す。なお、図2および後述する図5では、図を見やすくするために円弧面211a、211bと円弧面212および円弧面213との間に隙間があるように示したが、実際は接触している。接触面(211a,211b,212,213)の少なくとも一方の面には、軸芯調整時の接触部分の摩擦力を低減する目的で低摩擦係数の物質(例えば、ポリテトラフルオロエチレン(PTFE)や二硫化モリブデンなど)がコーティングされる。このコーティングは接触面の両面に施すのが好ましい。また、上述した調整用ボルト203a,203b,204a,204b,205a,205b,206a,206bが接触する面にも、同様のコーティングを行うのが好ましい。
【0015】
図5は軸芯調整装置20よる軸傾き調整を説明する図であり、(a)はX座標軸方向の傾き調整を、(b)はY座標軸方向の傾き調整を示している。図5(a)に示すように上グリップ8がX座標軸の負方向に傾いている場合(角度θ1)には、ボルト203aを緩めるとともにボルト203bを締め付けてボディ202を軸J6(紙面に垂直な軸)を回転軸として反時計回りに回転させ、X座標正方向(図示右側)に角度θ1だけ傾けてグリップ8の軸芯J4をグリップ9(図1参照)の軸芯J5に一致させる。軸J6は、円弧面211aが含まれる円筒状曲面(図4に示す円筒状曲面220であり、円弧面212もこの円筒状曲面に含まれる)の中心軸である。図示しないが、逆に、グリップ8がX座標軸の正方向に傾いている場合には、ボルト203bを緩めるとともにボルト203aを締め付けてボディ202をX座標負方向に傾ける。
【0016】
一方、図5(b)に示すようにグリップ8がY座標軸の負方向に傾いている場合(角度θ2)には、カラー201bに関するボルト203aを緩めるとともにボルト203bを締め付けて、カラー201bをグリップ8と一体にボディ202に対して軸J7(紙面に垂直な軸)を回転軸として反時計回りに回転させ、Y座標正方向(図示右側)に角度θ2だけ傾けてグリップ8の軸芯J4をグリップ9の軸芯J5に一致させる。逆に、グリップ8がY座標軸の正方向に傾いている場合には、ボルト203bを緩めるとともにボルト203aを締め付けてカラー201bをY座標負方向に傾ける。軸J7は、カラー201bの円弧面211bが含まれる円筒状曲面の中心軸である。
【0017】
なお、上述した軸芯調整は、図6に示すように円柱状部材の側面に複数の歪みゲージGを設けた評価用テストピース70を用いて評価試験を行う。この場合、テストピース70の両端をグリップで掴み、引っ張り負荷を与えたときの歪みゲージ70の歪みがゼロになるように調整用ボルト203a,203b,204a,204b,203a,203b,204a,204bを調整する。例えば、調整角度0.1度以下、横方向(XおよびY座標方向)ずれ1mm以下となるように調整する。このような軸芯調整は、材料試験機出荷時や、グリップ8,9交換時や、テストピース変換毎に行われる。
【0018】
上述した実施の形態では、カラー201aおよびカラー201aに同一曲率半径の円弧面211を形成したが、必ずしも同一形状の円弧面とする必要はなく、さらには、凸状の円弧面ではなく凹状の円弧面としても良い。凹状の円弧面とした場合、ボディ202の曲面212,213は凸状の円弧面とする。また、カラー201a,201aを互いに直交するように配設したが、厳密に直交していなくても良い。
【0019】
上述したように、本実施の形態では、ボルト203a,203b,205a、205bを調整することにより、カラー201bに固定されたグリップ8の2方向の傾き調整することができ、かつ、ボルト204a,204b,206a、206bを調整することにより、グリップ8をX座標方向およびY座標方向に調整することができる。これらの調整はグリップ8をジャッキアップした状態で行うことができ、正確な軸芯調整を簡単に行うことができる。また、円弧面211a,211b,212,213の形成は、球面軸受の球面形成に比べて容易であるため、製造コストアップを抑制することができる。
【0020】
以上説明した実施の形態と特許請求の範囲との対応において、クロスヘッド2は負荷枠を、グリップ8は把持部材を、円弧面211aは第1の円弧面を、円弧面211bは第2の円弧面を、円弧面212は第3の円弧面を、円弧面213は第4の円弧面を、カラー201aは第1の部材を、カラー201bは第2の部材を、ボディ202は第3の部材を、ボルト203a,203bは第1の角度調整部材を、ボルト205a,205bは第2の角度調整部材を、ボルト204a,204bは第1の位置調整部材を、ボルト206a,206bは第2の位置調整部材をそれぞれ構成する。
【0021】
【発明の効果】
以上説明したように、請求項1の発明によれば、供試体を把持する把持部材が固定される第2の部材を第3の部材に対して回転可能とし、かつ、第3の部材を負荷枠との相対位置が一定な第1の部材に対して回転可能とし、第2の部材および第3の部材の回転角度調整を第1,2の角度調整部材により行えるようにしたので、把持部材の軸芯調整(傾き調整)を2方向について容易に行うことができる。また、第1〜3の部材の互いの接触面は円弧面であるため、従来の球面軸受を用いるものに比べて製造コストを低減することができる。
さらに、負荷枠に対して第3の部材の位置を調整し、かつ、第3の部材に対して第2の部材の位置を調整することにより、把持部材の位置を異なる2方向に調整することができるため、より正確な軸芯調整が可能となる。
【図面の簡単な説明】
【図1】本発明による材料試験機の試験機本体の概略を示す図。
【図2】軸芯調整装置20の詳細を説明する図であり、(a)はX座標軸に沿った断面図、(b)は(a)のA−A’断面図。
【図3】軸芯調整装置20をクロスヘッド2側から見た平面図。
【図4】カラー201aの斜視図。
【図5】軸芯調整装置20による傾き調整を説明する図であり、(a)はX座標軸方向の傾き調整を示す図、(b)はY座標軸方向の傾き調整を示す図。
【図6】評価用テストピース70を示す図。
【図7】従来の材料試験機の試験機本体の概略を示す図。
【図8】傾斜板10,11を説明する図であり、(a)は傾斜板部分の断面図、(b)は傾斜板10,11の斜視図、(c)は傾き調整を説明する図。
【符号の説明】
1 基台
2 クロスヘッド
3 支柱
4 供試体
8,9 グリップ
20 軸芯調整装置
21 ロッド
22 取付板
23 ジャッキボルト
70 評価用テストピース
201a,201b カラー
202 ボディ
203a,203b,204a,204b,205a,205b,206a,206b ボルト
211a,211b,212,213 円弧面
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a material testing machine including an axis adjusting device for a gripping member that grips a specimen.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 7, a pair of support columns 3 are erected on a base 1, and a specimen 4 is installed in a load frame that is formed by cross-crossing a crosshead 2 there. A material testing machine is known in which a load and a displacement are measured by a load cell 6 and a displacement detector 7 such as a differential transformer while applying a load to the specimen 4 to obtain a load-displacement characteristic of the specimen 4. At this time, the specimen 4 is gripped by the upper and lower grips 8 and 9, but an accurate test cannot be performed unless the axes of the grips 8 and 9 are aligned. Therefore, conventionally, the grip 8 is attached to the crosshead 2 via a spherical bearing as disclosed in Japanese Patent Laid-Open No. 2-203241 or the inclined plates 10 and 11 as shown in FIG. Can be adjusted so that its axis is vertical (direction of load action).
[0003]
As shown in the perspective view of FIG. 8B, holes 10a and 11a are formed at the centers of the inclined plates 10 and 11, respectively. The grip 8 is attached to the cross head 2 so that the inclined plates 10 and 11 are sandwiched between the cross head 2 and the grip 8. At this time, the mounting shaft 8 a of the grip 8 passes through the holes 10 a and 11 a of the inclined plates 10 and 11 and is screwed to the mounting plate 12. The jack plate 13 is used to attach the mounting plate 12 to the crosshead 2. By pulling upward, the grip 8 is fastened to the crosshead 2 with a predetermined force.
[0004]
J1 in FIG. 8B indicates the normal line of the surface 10b of the inclined plate 10, and when the inclined plate 10 is rotated with respect to the vertical axis z, the normal line J1 of the surface 10b rotates around the Z coordinate axis as shown in the figure. To do. On the other hand, as shown in FIG. 8 (c), when the inclined plate 11 is rotated while maintaining the contact between the inclined surface 11b of the inclined plate 11 and the inclined surface 10b of the inclined plate 10, the inclined plate 11 rotates the normal line J1 along the rotation axis. Rotate as Therefore, the normal line J2 of the surface 11c to which the grip 8 is fixed rotates around the normal line J1. That is, the tilt plate 10 is turned to change the direction of the shaft core, and the tilt plate 11 is turned to adjust the tilt of the shaft core.
[0005]
[Problems to be solved by the invention]
By the way, when the tilt adjustment is performed, the jack bolts 13 are once loosened, the rotation angles of the respective inclined plates 10 and 11 are adjusted, and the jack bolts 13 are tightened and fixed again. However, when the jack bolt 13 is tightened again, the rotation angle of the inclined plates 10 and 11 may be shifted from the set position, and there is a drawback that it takes time for adjustment. Moreover, when the position of inclined board 10 and 11 itself has shifted | deviated, it is necessary to move the attachment position of the inclined boards 10 and 11 whole. On the other hand, when adjustment is performed using a spherical bearing, there is a disadvantage that the apparatus is expensive because spherical processing of the bearing is difficult.
[0006]
An object of the present invention is to provide a material testing machine including an axis adjustment device that can easily adjust the axis of a gripping member at a relatively low cost.
[0007]
[Means for Solving the Problems]
The embodiment of the invention will be described with reference to FIGS. 1, 2, and 5.
(1) The invention of claim 1 is applied to a material testing machine including an axis adjustment device 20 that adjusts the axis of a gripping member 8 that is fixed to the load frame 2 and holds the specimen 4. The device 20 has a first arc surface 211a, a first member 201a whose relative position to the load frame 2 is constant, and a second arc surface 211b, and a second member to which the gripping member 8 is fixed. A third arc surface 212 that contacts the first arc surface 211a and the fourth arc surface 213 that contacts the member 201b and the second arc surface 211b. The first angle adjusting member 203a that adjusts the rotation angle of the third member 202 relative to the first member 201a with the center axis J6 of the cylindrical curved surface including the member 202 and the first circular arc surface 211a as the rotation axis. 203b and a cylindrical curved surface including the second arcuate surface 211b The second angle adjusting members 205a and 205b for adjusting the rotation angle of the second member 201b with respect to the third member 202 with the central axis J7 as the rotation axis, and the positions of the third member 202 with respect to the load frame 2 The first position adjusting members 204a and 204b that adjust in one direction (Y coordinate axis direction), and the second direction (X coordinate direction) where the position of the second member 201b relative to the third member 202 differs from the first direction And the second position adjusting members 206a and 206b for adjusting the above-mentioned object.
[0008]
In the section of the means for solving the above-described problems for explaining the configuration of the present invention, the drawings of the embodiments of the invention are used for easy understanding of the present invention. The form is not limited.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing an embodiment of a material testing machine according to the present invention, and is a diagram showing a schematic configuration of a testing machine main body. In FIG. 1, the same parts as those in FIGS. 7 and 8 are denoted by the same reference numerals, and different parts will be mainly described. In FIG. 1, the grip 8 is attached to the crosshead 2 via an axis adjusting device 20. In FIG. 1, the load cell is omitted.
[0010]
2A and 2B are diagrams showing details of the shaft center adjusting device 20, wherein FIG. 2A is a cross-sectional view seen from the front of FIG. 1, and FIG. 2B is a cross-sectional view taken along line AA ′ of FIG. FIG. 3 is a plan view of the axis adjusting device 20 viewed from the crosshead 2 side. The shaft center adjusting device 20 includes a body 202 and a pair of collars 201a and 201b arranged so as to sandwich the body 202 from above and below, and the shaft core of the collar 201a is adjusted using bolts 203a, 203b, 204a and 204b. The axis of the collar 201b is adjusted using bolts 205a, 205b, 206a, and 206b.
[0011]
When the grip 8 is attached to the crosshead 2, the collar 201b, the body 202 and the collar 201a are inserted so that the rod 21 provided on the grip 8 penetrates the holes 201 and 202 formed in the collars 201a and 201b and the body 202. The mounting plate 22 is attached to the tip portion of the rod 21 between the cross head 2 and the rod 21. The grip 8 is jacked up with a predetermined force by the jack bolt 23 and fixed to the cross head 2.
[0012]
FIG. 4 is a perspective view of the collar 201a. The collar 201a is a columnar member in which one of the side surfaces of a prism is formed on a convex arcuate surface 211a having a radius of curvature R. In the case of the collar 201a, the arcuate surface 211a is directed downward. Is arranged. The collar 201b has the same shape as the collar 201a. In the case of the collar 201b, the collar 201b is disposed with the arc surface 211b facing upward. Reference numerals 201b and 211b relating to the collar 201b are shown in parentheses. Here, when the direction of the arrow in FIG. 4 is named the longitudinal direction of the collar, as shown in FIG. 2, the longitudinal direction of the collar 201a and the longitudinal direction of the collar 201b are arranged so as to be orthogonal to each other. That is, the longitudinal direction of the collar 201a is parallel to the Y coordinate axis, and the longitudinal direction of the collar 201b is parallel to the X coordinate axis. A curved surface indicated by a one-dot chain line 220 in FIG. 4 represents a cylindrical curved surface having a radius R including the circular arc surface 211a (211b).
[0013]
As shown in the plan view of FIG. 3, with respect to the collar 201a, tilt adjusting bolts 203a and 203b are provided in the X coordinate axis direction, and Y direction position adjusting bolts 204a and 204b are provided in the Y coordinate axis direction. For example, when adjusting (moving) the body 202 in the positive direction of the Y coordinate, the bolt 204a is loosened and the bolt 204b is tightened. Conversely, when adjusting in the minus direction, the bolt 204b is loosened and the bolt 204a is tightened. The axis inclination adjustment will be described later. On the other hand, as can be seen from FIG. 2, with respect to the collar 201b arranged so as to be orthogonal to the collar 201a, tilt adjusting bolts 205a and 205b are provided in the Y coordinate axis direction, and for adjusting the X direction position in the X coordinate axis direction. Bolts 206a and 206b are provided.
[0014]
As shown in FIG. 2, the shape of the surface 212 of the body 202 that contacts the arc surface 211a of the collar 201a forms a concave arc surface having the same radius of curvature R as the arc surface 211a, and the arc surface 211b of the collar 201b. The surface 213 in contact with the circular arc surface 212 forms a concave arc surface similar to that of the circular arc surface 212, although the direction is different by 90 degrees. In FIG. 2 and FIG. 5 to be described later, in order to make the drawing easier to see, the arc surfaces 211a and 211b are shown to have a gap between the arc surface 212 and the arc surface 213, but actually they are in contact. At least one surface of the contact surfaces (211a, 211b, 212, 213) has a low coefficient of friction material (for example, polytetrafluoroethylene (PTFE) or the like) for the purpose of reducing the frictional force of the contact portion when adjusting the axis. Coated with molybdenum disulfide. This coating is preferably applied on both sides of the contact surface. In addition, it is preferable to perform the same coating on the surface where the adjustment bolts 203a, 203b, 204a, 204b, 205a, 205b, 206a, and 206b contact.
[0015]
FIGS. 5A and 5B are diagrams for explaining the axis tilt adjustment by the axis adjusting device 20, wherein FIG. 5A shows the tilt adjustment in the X coordinate axis direction, and FIG. 5B shows the tilt adjustment in the Y coordinate axis direction. As shown in FIG. 5A, when the upper grip 8 is tilted in the negative direction of the X coordinate axis (angle θ1), the bolt 203a is loosened and the bolt 203b is tightened to bring the body 202 into the axis J6 (perpendicular to the paper surface). The shaft 8 is rotated counterclockwise about the rotation axis, and is tilted by an angle θ1 in the positive X-coordinate direction (right side in the drawing) so that the shaft core J4 of the grip 8 coincides with the shaft core J5 of the grip 9 (see FIG. 1). The axis J6 is the central axis of the cylindrical curved surface (the cylindrical curved surface 220 shown in FIG. 4 and the circular arc surface 212 is also included in this cylindrical curved surface) including the circular arc surface 211a. Although not shown, conversely, when the grip 8 is tilted in the positive direction of the X coordinate axis, the bolt 203b is loosened and the bolt 203a is tightened to tilt the body 202 in the negative X coordinate direction.
[0016]
On the other hand, as shown in FIG. 5B, when the grip 8 is inclined in the negative direction of the Y-coordinate axis (angle θ2), the bolt 203a related to the collar 201b is loosened and the bolt 203b is tightened to hold the collar 201b to the grip 8 Rotate counterclockwise with the axis J7 (axis perpendicular to the paper surface) as the rotation axis with respect to the body 202, and tilt the angle Y2 in the positive Y coordinate direction (right side in the figure) to grip the axis J4 of the grip 8. It is made to correspond to the axial center J5 of 9. Conversely, when the grip 8 is inclined in the positive direction of the Y coordinate axis, the bolt 203b is loosened and the bolt 203a is tightened to incline the collar 201b in the negative Y coordinate direction. The axis J7 is a central axis of a cylindrical curved surface including the arc surface 211b of the collar 201b.
[0017]
In addition, the axial center adjustment mentioned above performs an evaluation test using the test piece 70 for evaluation which provided the some strain gauge G in the side surface of a cylindrical member, as shown in FIG. In this case, the adjustment bolts 203a, 203b, 204a, 204b, 203a, 203b, 204a, and 204b are adjusted so that the strain of the strain gauge 70 when gripping both ends of the test piece 70 and applying a tensile load becomes zero. adjust. For example, the adjustment angle is adjusted to 0.1 ° or less and the lateral (X and Y coordinate directions) shift is 1 mm or less. Such an axis adjustment is performed at the time of shipment of the material testing machine, when the grips 8 and 9 are replaced, or every time the test piece is converted.
[0018]
In the embodiment described above, the collar 201a and the arc surface 211 having the same radius of curvature are formed on the collar 201a. However, it is not always necessary to use the arc shape having the same shape, and further, a concave arc instead of a convex arc surface. It is good as a surface. In the case of a concave arc surface, the curved surfaces 212 and 213 of the body 202 are convex arc surfaces. Further, although the collars 201a and 201a are disposed so as to be orthogonal to each other, they may not be strictly orthogonal.
[0019]
As described above, in the present embodiment, by adjusting the bolts 203a, 203b, 205a, and 205b, the inclination of the grip 8 fixed to the collar 201b can be adjusted in two directions, and the bolts 204a and 204b can be adjusted. , 206a, 206b, the grip 8 can be adjusted in the X coordinate direction and the Y coordinate direction. These adjustments can be performed with the grip 8 being jacked up, and accurate axis adjustment can be easily performed. In addition, since the formation of the arc surfaces 211a, 211b, 212, and 213 is easier than the formation of the spherical surface of the spherical bearing, an increase in manufacturing cost can be suppressed.
[0020]
In the correspondence between the embodiment described above and the claims, the crosshead 2 is a load frame, the grip 8 is a gripping member, the arc surface 211a is a first arc surface, and the arc surface 211b is a second arc. The arc surface 212 is the third arc surface, the arc surface 213 is the fourth arc surface, the collar 201a is the first member, the collar 201b is the second member, and the body 202 is the third member. The bolts 203a and 203b are first angle adjusting members, the bolts 205a and 205b are second angle adjusting members, the bolts 204a and 204b are first position adjusting members, and the bolts 206a and 206b are second positions. Each adjustment member is configured.
[0021]
【The invention's effect】
As described above, according to the first aspect of the present invention, the second member to which the holding member for holding the specimen is fixed can be rotated with respect to the third member, and the third member is loaded. Since the first member having a fixed relative position to the frame is rotatable, the rotation angle of the second member and the third member can be adjusted by the first and second angle adjusting members. Can be easily adjusted in two directions. In addition, since the contact surfaces of the first to third members are arcuate surfaces, the manufacturing cost can be reduced as compared with a conventional spherical bearing.
Further, by adjusting the position of the third member with respect to the load frame and adjusting the position of the second member with respect to the third member, the position of the gripping member is adjusted in two different directions. Therefore, more accurate axis adjustment is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a testing machine main body of a material testing machine according to the present invention.
2A and 2B are diagrams for explaining the details of an axis adjusting device 20; FIG. 2A is a cross-sectional view along the X coordinate axis, and FIG. 2B is a cross-sectional view along AA ′ in FIG.
FIG. 3 is a plan view of the shaft center adjusting device 20 as viewed from the crosshead 2 side.
FIG. 4 is a perspective view of a collar 201a.
FIGS. 5A and 5B are diagrams for explaining tilt adjustment by the axis adjusting device 20; FIG. 5A shows tilt adjustment in the X coordinate axis direction, and FIG. 5B shows tilt adjustment in the Y coordinate axis direction;
6 is a view showing an evaluation test piece 70. FIG.
FIG. 7 is a diagram showing an outline of a testing machine main body of a conventional material testing machine.
8A and 8B are diagrams illustrating the inclined plates 10 and 11, where FIG. 8A is a cross-sectional view of the inclined plate portion, FIG. 8B is a perspective view of the inclined plates 10 and 11, and FIG. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Crosshead 3 Support | pillar 4 Specimen 8 and 9 Grip 20 Axis center adjusting device 21 Rod 22 Mounting plate 23 Jack bolt 70 Evaluation test piece 201a, 201b Color 202 Body 203a, 203b, 204a, 204b, 205a, 205b , 206a, 206b Bolt 211a, 211b, 212, 213 Arc surface

Claims (1)

負荷枠に固設されて供試体を把持する把持部材の軸芯を調整する軸芯調整装置を備える材料試験機において、
前記軸芯調整装置は、第1の円弧面を有し、前記負荷枠との相対位置が一定な第1の部材と、
第2の円弧面を有し、前記把持部材が固定される第2の部材と、
前記第1の円弧面に嵌合するように接触する第3の円弧面および前記第2の円弧面に嵌合するように接触する第4の円弧面を有する第3の部材と、
前記第1の円弧面を含む円筒状曲面の中心軸を回転軸とする、前記第1の部材に対する前記第3の部材の回転角度を調整する第1の角度調整部材と、
前記第2の円弧面を含む円筒状曲面の中心軸を回転軸とする、前記第3の部材に対する前記第2の部材の回転角度を調整する第2の角度調整部材と、
前記負荷枠に対する前記第3の部材の位置を第1の方向に調整する第1の位置調整部材と、
前記第3の部材に対する前記第2の部材の位置を第1の方向と異なる第2の方向に調整する第2の位置調整部材とを備えることを特徴とする材料試験機。
In a material testing machine provided with an axis adjustment device that adjusts the axis of a gripping member fixed to a load frame and gripping a specimen,
The shaft center adjusting device has a first arc surface, and a first member having a constant relative position to the load frame;
A second member having a second arcuate surface to which the gripping member is fixed;
A third member having a third arc surface that comes into contact with the first arc surface and a fourth arc surface that comes into contact with the second arc surface;
A first angle adjusting member for adjusting a rotation angle of the third member with respect to the first member, the rotation axis being a central axis of a cylindrical curved surface including the first arc surface;
A second angle adjusting member that adjusts a rotation angle of the second member with respect to the third member, with a central axis of a cylindrical curved surface including the second arc surface as a rotation axis;
A first position adjusting member that adjusts the position of the third member with respect to the load frame in a first direction;
A material testing machine comprising: a second position adjusting member that adjusts a position of the second member with respect to the third member in a second direction different from the first direction.
JP34709098A 1998-12-07 1998-12-07 Material testing machine Expired - Lifetime JP3849331B2 (en)

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JP2012047623A (en) * 2010-08-27 2012-03-08 Shimadzu Corp Shaft center adjusting device for material testing machine
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