JP3391139B2 - Tensile impact tester - Google Patents
Tensile impact testerInfo
- Publication number
- JP3391139B2 JP3391139B2 JP05575595A JP5575595A JP3391139B2 JP 3391139 B2 JP3391139 B2 JP 3391139B2 JP 05575595 A JP05575595 A JP 05575595A JP 5575595 A JP5575595 A JP 5575595A JP 3391139 B2 JP3391139 B2 JP 3391139B2
- Authority
- JP
- Japan
- Prior art keywords
- load cell
- tensile impact
- load
- test piece
- machine frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、試験片に引張衝撃を与
え、その強度試験を行う引張衝撃試験機に関する。
【０００２】
【従来の技術】図２は引張衝撃試験機の試験片周辺の概
略構成を示す図、図３は引張衝撃試験機の試験片周辺の
見取図である。図２及び図３を用いて、従来の引張衝撃
試験機を説明する。
【０００３】この種の引張衝撃試験機は試験片ＴＰの取
りつけ部の回りに、アクチュエータロッド１に連結され
る可動側治具Ｌと固定側治具Ｆとが配置されており、こ
の治具Ｆは機枠２に取りつけられたロードセル基体４及
びこれと一体に形成されたロードセル３に連結されてい
る。又試験片ＴＰの可動側端部及び固定側端部はそれぞ
れチャック５，６で強く把持されている。
【０００４】可動側治具ＬはＵ字形状に形成され、その
基端側Ｌ１が負荷機構（図示省略）のアクチュエータロ
ッド１にねじ部Ｌａで連結され、固定側治具Ｆ側の開放
端Ｌ２には突部Ｌ３が内方に突設されている。また、可
動側治具Ｌの背面にはＵ字状部材と一体に壁部材が設け
られ衝撃力で開放端部が拡がらないようにされている。
さらに、チャック５（及びチャック６）は、一方に歯面
を有する２枚の台形状板から成り、ボルト７で試験片Ｔ
Ｐを強固に挾着する。このチャック５は可動側治具Ｌの
引張方向への助走後にその突部Ｌ３に衝突するものであ
る。なお、チャック５（及びチャック６）はアルミニウ
ムやチタンなどで構成される。
【０００５】一方、固定側治具ＦもＵ字状に形成され、
その基端側Ｆ１はねじ部Ｆａでロードセル３に連結さ
れ、ロードセル３と一体形成されたロードセル基体４
は、ボルト８によって機枠２に取りつけられるととも
に、その下方の開放端Ｆ２には突部Ｆ３が内方に突設さ
れている。試験片ＴＰの固定側に取りつけられるチャッ
ク６は２枚の台形状板から成り、ボルト８で試験片ＴＰ
を挾着保持している。このチャック６は固定側治具Ｆの
内方に位置し、試験片ＴＰがチャック６で突部Ｆ３に吊
持される。
【０００６】図２は、特に試験開始前の位置関係を示し
ており、試験片ＴＰはその固定側のチャック６を固定側
治具Ｆの突部Ｆ３に係合させて吊り下げられ、可動側の
チャック５は可動側治具Ｌに内包されてその基端側Ｌ１
側に位置している。試験片ＴＰの装着方法は、上下の治
具Ｌ，Ｆの間隔を調整してチャック５，６を治具Ｌ，Ｆ
正面から上側治具Ｆの内方に挿入して突部Ｆ３に係合し
て行う。
【０００７】この状態で試験片ＴＰの固定側治具Ｆ側の
チャック６が突部Ｆ３で吊持される。負荷機構によりア
クチュエータロッド１を矢印下方に駆動すると、可動側
治具Ｌも一体に下方に運動を開始する。可動側治具Ｌは
助走区間に相当する距離だけ移動する間に加速されて所
望の速度に達し、突部Ｌ３がチャック５と衝突すると試
験片ＴＰに引張衝撃力が作用する。その過程における荷
重と変位は、それぞれロードセル３と変位計（図示省
略）で計測される。
【０００８】ところで、このような引張衝撃力が作用し
た後には、図４に示すように、その反動によりロードセ
ル基体４が機枠２の取りつけ面に力ｔ（単位面積当た
り）を及ぼす。これによって、ロードセル基体４は機枠
２から反力Ｔ（単位面積当たり）を受けるので、ロード
セル３で計測される荷重には、この反力Ｔが含まれるこ
ととなり、計測される荷重−変位特性はこのような誤差
を含んだものとなる。
【０００９】
【発明が解決しようとする課題】本発明は、上記した問
題点を解決するために創案されたもので、その目的は、
引張衝撃力が作用した直後の反動によって、ロードセル
基体が機枠の取りつけ面から受ける反力のうち、ロード
セルに作用する力を軽減することを目的とする。
【００１０】
【課題を解決するための手段】本発明は、試験片を把持
する一対の把持具と、一方側がこの把持具の一方に連結
され、他方側がロードセル基体を介して機枠に固定され
た荷重検出用ロードセルと、前記把持具の他方に連結さ
れた引張衝撃荷重負荷用アクチュエータとを備えた材料
試験機において、前記ロードセル基体における前記機枠
との接触面に空洞部を設け、試験片に衝撃荷重を負荷し
た際、機枠側からロードセルに作用する反力を軽減する
ことを特徴とする。
【００１１】
【作用】アクチュエータにより試験片に引張衝撃力を与
えた直後、その反動によって、ロードセル基体は機枠に
力を及ぼす。これに対する反力がロードセル基体を介し
てロードセルで検出されるが、本発明では、機枠側から
ロードセルに作用する反力を軽減する手段、すなわちロ
ードセル基体における機枠との接触面には、ロードセル
との共通断面の鉛直方向の面に相当、若しくはそれを包
含する大きさの断面を有する空洞部を設けることによっ
て、ロードセルに直接作用する衝撃反力の分力を小さく
し、ロードセルに作用する反力を軽減する。
【００１２】
【実施例】上述した従来の引張衝撃試験機（図２参照）
と比較すると、本発明の要旨は、ロードセルの取り付け
構成に存する。
【００１３】図１は本発明の一実施例である引張衝撃試
験機の概略構成を示す図である。本実施例において、ロ
ードセル３と一体に形成されたロードセル基体４は、ボ
ルト８によって、機枠２と接触固定される。このロード
セル基体４における機枠２との接触面には、空洞部Ｗが
設けられる。特にロードセル３との共通断面Ｓ１の鉛直
方向の面Ｓ２に相当、若しくはそれを包含する大きさの
断面積を有する空洞部が好ましい。
【００１４】このような構成の引張衝撃試験機で引張衝
撃力を作用させると、空洞部Ｗが設けられているため、
面Ｓ２には、図４に示したような引張衝撃力の反動によ
る力ｔが作用しないため、面Ｓ２からはもちろんロード
セル基体４に対し、その反力Ｔが作用しない。したがっ
て、ロードセル３に直接作用する反力Ｔがなくなり、計
測される荷重−変位特性から、引張衝撃力の反動を原因
とした誤差を低減することができる。
【００１５】
【発明の効果】本発明は、試験片に衝撃荷重を負荷した
際、機枠側からロードセルに作用する反力を軽減する手
段、すなわちロードセル基体における機枠との接触面に
は、ロードセルとの共通断面の鉛直方向の面に相当、若
しくはそれを包含する大きさの断面を有する空洞部を設
けることによって単位面積当たりの反力、すなわち圧力
を小さくしたので、ロードセルに作用する衝撃反力の分
力が軽減される。したがって、引張衝撃力が作用した直
後の反動によって、ロードセル基体が機枠の接触面から
受ける反力のうち、ロードセルに作用する分を軽減する
ことが可能となり、正確な荷重−変位特性を得ることが
できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensile impact tester for applying a tensile impact to a test piece and performing a strength test on the test piece. 2. Description of the Related Art FIG. 2 is a diagram showing a schematic structure around a test piece of a tensile impact tester, and FIG. 3 is a sketch drawing around a test piece of a tensile impact tester. A conventional tensile impact tester will be described with reference to FIGS. In this type of tensile impact tester, a movable jig L and a fixed jig F connected to an actuator rod 1 are arranged around a mounting portion of a test piece TP. Is connected to the load cell base 4 attached to the machine frame 2 and the load cell 3 formed integrally therewith. The movable end and the fixed end of the test piece TP are strongly gripped by the chucks 5 and 6, respectively. The movable jig L is formed in a U-shape, and its proximal end L1 is connected to an actuator rod 1 of a load mechanism (not shown) by a screw portion La, and an open end L2 on the fixed jig F side. Has a protrusion L3 protruding inward. In addition, a wall member is provided integrally with the U-shaped member on the back surface of the movable side jig L so that the open end does not expand due to an impact force.
Further, the chuck 5 (and the chuck 6) is composed of two trapezoidal plates each having a tooth surface on one side.
P is firmly clamped. The chuck 5 collides with the protrusion L3 after the movable jig L has advanced in the pulling direction. The chuck 5 (and the chuck 6) is made of aluminum, titanium, or the like. On the other hand, the fixed-side jig F is also formed in a U-shape,
The base end side F1 is connected to the load cell 3 by a screw portion Fa, and the load cell base 4 integrally formed with the load cell 3 is formed.
Is mounted on the machine frame 2 by bolts 8, and a protruding portion F3 is provided inwardly at an open end F2 thereunder. The chuck 6 attached to the fixed side of the test piece TP is composed of two trapezoidal plates,
Is held. The chuck 6 is located inside the fixed-side jig F, and the test piece TP is suspended by the chuck 6 on the protrusion F3. FIG. 2 particularly shows the positional relationship before the start of the test. The test piece TP is suspended by engaging the chuck 6 on the fixed side thereof with the projection F3 of the fixed side jig F, and is moved downward. The chuck 5 is enclosed in the movable jig L and has its proximal end L1.
Located on the side. The method of mounting the test piece TP is such that the chucks 5 and 6 are adjusted by adjusting the distance between the upper and lower jigs L and F.
It is inserted from the front into the upper jig F and engaged with the protrusion F3. In this state, the chuck 6 on the fixed jig F side of the test piece TP is suspended by the projection F3. When the actuator rod 1 is driven downward by the load mechanism, the movable jig L also starts to move downward integrally. The movable jig L is accelerated while moving by a distance corresponding to the approaching section and reaches a desired speed. When the protrusion L3 collides with the chuck 5, a tensile impact force acts on the test piece TP. The load and displacement in the process are measured by the load cell 3 and a displacement meter (not shown), respectively. By the way, after such a tensile impact force acts, the load cell base 4 exerts a force t (per unit area) on the mounting surface of the machine frame 2 due to the reaction as shown in FIG. As a result, the load cell base 4 receives the reaction force T (per unit area) from the machine frame 2, so that the load measured by the load cell 3 includes the reaction force T, and the measured load-displacement characteristic Contains such an error. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems.
An object of the present invention is to reduce a force acting on a load cell among reaction forces received by a load cell base from a mounting surface of a machine frame due to a recoil immediately after a tensile impact force acts. According to the present invention, there is provided a pair of grippers for gripping a test piece, one side of which is connected to one of the grippers, and the other side of which is fixed to a machine frame via a load cell base. A load detecting load cell, and a tensile impact load loading actuator connected to the other of the grippers, a hollow portion is provided on a contact surface of the load cell base with the machine frame, and a test piece is provided. When an impact load is applied to the load cell, the reaction force acting on the load cell from the machine frame side is reduced. Immediately after the tensile impact force is applied to the test piece by the actuator, the load cell base exerts a force on the machine frame due to the reaction. The reaction force against this is detected by the load cell via the load cell base, but in the present invention, the means for reducing the reaction force acting on the load cell from the machine frame side, that is, the load cell body has a contact surface with the machine frame. By providing a cavity having a cross section of a size equivalent to or including the vertical plane of the common cross section with the load cell, the component of the impact reaction force directly acting on the load cell is reduced, and the reaction force acting on the load cell is reduced. Reduce power. DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-mentioned conventional tensile impact tester (see FIG. 2)
The gist of the present invention lies in the mounting configuration of the load cell. FIG. 1 is a diagram showing a schematic configuration of a tensile impact tester according to one embodiment of the present invention. In this embodiment, the load cell base 4 formed integrally with the load cell 3 is fixed to the machine frame 2 by bolts 8. A cavity W is provided on the contact surface of the load cell base 4 with the machine frame 2. In particular, a cavity having a cross-sectional area of a size corresponding to or including the vertical surface S2 of the common cross section S1 with the load cell 3 is preferable. When a tensile impact force is applied by the tensile impact tester having such a configuration, since the hollow portion W is provided,
Since the force t due to the reaction of the tensile impact force as shown in FIG. 4 does not act on the surface S2, the reaction force T does not act on the load cell base 4 from the surface S2 as well. Accordingly, the reaction force T directly acting on the load cell 3 is eliminated, and errors due to the reaction of the tensile impact force can be reduced from the measured load-displacement characteristics. According to the present invention, there is provided means for reducing the reaction force acting on the load cell from the machine frame side when an impact load is applied to the test piece, that is, the contact surface of the load cell base with the machine frame includes: The reaction force per unit area, that is, the pressure was reduced by providing a cavity having a cross section of a size corresponding to or including the vertical surface of the common cross section with the load cell. The power component is reduced. Therefore, by the reaction immediately after the tensile impact force acts, it becomes possible to reduce the amount of the reaction force received by the load cell base body from the contact surface of the machine frame that acts on the load cell, and obtain accurate load-displacement characteristics. Can be.
【図面の簡単な説明】
【図１】本発明の一実施例である引張衝撃試験機の概略
構成を示す図である。
【図２】従来の引張衝撃試験機の概略構成を示す図であ
る。
【図３】従来の引張衝撃試験機の概略見取図である。
【図４】ロードセル基体と機枠との間に作用する力の関
係を示す図である。
【符号の説明】
Ｆ・・・・・固定側治具
Ｌ・・・・・可動側治具
１・・・・・アクチュエータロッド
２・・・・・機枠
３・・・・・ロードセル
４・・・・・ロードセル基体
ＴＰ・・・・試験片BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a tensile impact tester according to one embodiment of the present invention. FIG. 2 is a diagram showing a schematic configuration of a conventional tensile impact tester. FIG. 3 is a schematic drawing of a conventional tensile impact tester. FIG. 4 is a diagram showing a relationship between forces acting between a load cell base and a machine frame. [Description of Signs] F ···········································································································································································. .... Load cell substrate TP ... Test piece
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 3/08 G01N 3/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) G01N 3/08 G01N 3/02
Claims (1)
側がこの把持具の一方に連結され、他方側がロードセル
基盤部材を介して機枠に固定された荷重検出用ロードセ
ルと、前記把持具の他方に連結された引張衝撃荷重負荷
用アクチュエータとを備えた材料試験機において、試験
片に衝撃荷重を負荷した際、機枠側からロードセルに作
用する反力を軽減する手段を設けたことを特徴とする引
張衝撃試験機。(57) [Claims 1] A pair of grippers for gripping a test piece, one side is connected to one of the grippers, and the other side is fixed to a machine frame via a load cell base member. In a material testing machine including a load cell for load detection and an actuator for applying a tensile impact load connected to the other of the grippers, when an impact load is applied to a test piece, a reaction force acting on the load cell from the machine frame side. A tensile impact tester characterized by having means for reducing the impact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05575595A JP3391139B2 (en) | 1995-03-15 | 1995-03-15 | Tensile impact tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05575595A JP3391139B2 (en) | 1995-03-15 | 1995-03-15 | Tensile impact tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08247912A JPH08247912A (en) | 1996-09-27 |
| JP3391139B2 true JP3391139B2 (en) | 2003-03-31 |
Family
ID=13007667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05575595A Expired - Fee Related JP3391139B2 (en) | 1995-03-15 | 1995-03-15 | Tensile impact tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3391139B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101262893B1 (en) * | 2011-10-21 | 2013-05-10 | 부산대학교 산학협력단 | Jig Structure for Tensile and Fatigue Tests of Thin Plates and Method for Tensile and Fatigue Test Using the Same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0406434D0 (en) * | 2004-03-22 | 2004-04-28 | Dage Prec Ind Ltd | High speed pull test device |
| CN103163019B (en) * | 2013-03-04 | 2016-11-23 | 江苏大学 | For sheet metal or the Special fixture for tensile test of metal forming and using method |
| CN105910909B (en) * | 2016-03-29 | 2018-12-21 | 中国地震局地壳应力研究所 | The double annulus uniaxial direct tensile Tensile Strength of Rock testing machines of more diameter cores |
-
1995
- 1995-03-15 JP JP05575595A patent/JP3391139B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101262893B1 (en) * | 2011-10-21 | 2013-05-10 | 부산대학교 산학협력단 | Jig Structure for Tensile and Fatigue Tests of Thin Plates and Method for Tensile and Fatigue Test Using the Same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08247912A (en) | 1996-09-27 |
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