CN102359774A - Real-time strain measurement apparatus for stamping and forming and test method thereof - Google Patents

Real-time strain measurement apparatus for stamping and forming and test method thereof Download PDF

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Publication number
CN102359774A
CN102359774A CN201110200447XA CN201110200447A CN102359774A CN 102359774 A CN102359774 A CN 102359774A CN 201110200447X A CN201110200447X A CN 201110200447XA CN 201110200447 A CN201110200447 A CN 201110200447A CN 102359774 A CN102359774 A CN 102359774A
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China
Prior art keywords
foil gauge
strain
real
die
workpiece
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Pending
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CN201110200447XA
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Chinese (zh)
Inventor
陈靖芯
张霞
李红
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Yangzhou University
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Yangzhou University
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Priority to CN201110200447XA priority Critical patent/CN102359774A/en
Publication of CN102359774A publication Critical patent/CN102359774A/en
Pending legal-status Critical Current

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Abstract

The invention, which belongs to the dynamic strain measurement technology field, relates to a real-time strain measurement apparatus for stamping and forming and a test method thereof. The real-time strain measurement apparatus comprises a static strain indicator, leads, foil gauges and a die. The foil gauges are fixed on test points and are connected with the static strain indicator through leads; besides, the die comprises a punch die and a female die; and a groove that is used for placing the foil gauges is arranged at positions of the female die, wherein the positions are corresponded to the test points. When real-time strain measurement on stamping and forming is carried out, different deformation portions of a workpiece and portions having different strain characteristics are utilized as test points of a sheet metal; the foil gauges are pasted; the foil gauges of the apparatus and the connecting leads are placed in the groove; the connecting leads are led out by the groove; and on the basis of utilization of a step-by-step stamping method, a real-time stress strain value is measured and obtained. According to the invention, the structure of the apparatus is simple and reasonable; it only needs to improve a die, so costs are low; and the apparatus has strong practicability; besides, the test method is simple and rapid; and during the part stamping stroke, it is convenient to measure a strain value.

Description

A kind of real-time strain gauge means and method of testing of drawing
Technical field
The invention discloses a kind of real-time strain gauge means and method of testing of drawing, belong to dynamic strain measurement device and method of testing.
Background technology
The use of high-strength steel sheet on automobile makes the resilience problem of stamping parts of automobile become outstanding, in order to check the Strength Changes of high-strength steel sheet in punching course, needs a kind of real-time strain gauge means of drawing.At present, strain measurement method commonly used is the strain measurement under the static state.In the stamping process of plate, the sheet material at deformation processing position is in the nip region of diel up and down just, and untouchable means of testing more can't be used, and can not in sheet material, imbed sensor again, so very big to its difficulty of carrying out the actual condition test.Therefore, the real-time strain gauge means and the method for testing that need a kind of new drawing.
Summary of the invention
The objective of the invention is defective to prior art; A kind of real-time strain gauge means and method of testing of drawing are provided, and this proving installation can be measured strain easily in the part punching stroke; Simple in structure; Cost is low, and is practical, and this method of testing can be measured strain value quickly and easily.
First purpose of the present invention realizes that through following technical scheme a kind of real-time strain gauge means of drawing comprises statical strain indicator, lead, foil gauge and mould; Foil gauge is fixed on the selected test point of workpiece; Foil gauge is connected with statical strain indicator, and described mould comprises punch die and die, it is characterized in that; The corresponding position of described die and test point is provided with the groove that is used to place foil gauge, and groove is on the line of symmetry of the front and back of die.Said foil gauge is placed in the groove, and described statical strain indicator is 1/4 ridge method, and foil gauge is wired to the AB brachium pontis of described statical strain indicator, and the shared one piece of compensating plate of said foil gauge connects the public compensation brachium pontis of said statical strain indicator.
Second purpose embodiment of the present invention is: a kind of real-time strain measurement method of drawing may further comprise the steps:
(1) the real-time strain gauge means of outfit drawing: comprise the mould that statical strain indicator, lead, foil gauge and punch die and die are formed, statical strain indicator is 1/4 ridge method;
(2),, confirm some test points and foil gauge paste position at workpiece different deformation place and position with differently strained characteristics according to the workpiece deformation characteristics; For the workpiece of stretch wrap forming, test point is chosen in the both sides of bent angle; Strain measurement in real time for ease is on the surface of the work that test point is chosen in die contacts;
(3) the corresponding position of in die and step (2), confirming of test point processes groove; Foil gauge and connection lead are placed in the groove; Connecting lead draws through groove; The foil gauge of each test point connects the AB brachium pontis of described statical strain indicator through lead, and the shared one piece of compensating plate of foil gauge connects the public compensation brachium pontis of statical strain indicator;
(4) with the segmentation of punch die stroke, workpiece gradation punching press is accomplished, and carries out data test respectively after end of a period of each section stroke and the release, can obtain the real-time strain value of workpiece drawing in the punching course.
The real-time strain gauge means of drawing of the present invention is rational in infrastructure simple, only need improve mould, and cost is lower, and implementation is stronger.The present invention measures real-time strain easily in the part punching stroke, calculate real-time stress; For the correction of mould provides foundation more accurately; Shorten the construction cycle of mould, reduce the stamping defect of high-strength steel sheet part, can be used for the complicated die of all kinds of high-strength steel sheet parts.
The present invention is according to the deformation characteristics of test specimen (workpiece); Confirm the different deformation place of workpiece and position with differently strained characteristics and for surface of the work that die contacts on, the both side surface of the bent angle of stretch wrap forming is the paste position of crucial test point and foil gauge; And on mould, produce the groove that is specifically designed to real-time strain testing; The proving installation that utilizes statical strain indicator, mould, test specimen (workpiece), foil gauge to form through the substep pressing, carries out the test of real-time strain; Can overcome the deficiency that existing strain gauge means can't accurately carry out the real-time working condition test, the real-time strain of stamping parts specified location is measured stage by stage in real time.
Description of drawings
Fig. 1 is the structural representation of the real-time strain gauge means of drawing of the present invention;
Fig. 2 is a workpiece schematic illustration of strain of the present invention, and wherein "+" expression arrow workpiece position pointed receives tension, and "-" expression arrow workpiece position pointed receives compressive stress;
Fig. 3 is a die sectional structure synoptic diagram of the present invention;
Fig. 4 is the position view of foil gauge on workpiece in the real-time strain measurement process of drawing of the present invention;
Among the figure: 1 punch die, 2 dies, 3 workpiece, 4-I foil gauge, 4-II foil gauge, 4-III foil gauge, 4-IV foil gauge, 4-V foil gauge, 5 leads, 6 statical strain indicators, 7 grooves.
Embodiment
Embodiment 1
As shown in Figure 1; The real-time strain gauge means of drawing; Comprise statical strain indicator 6, lead 5, foil gauge 4-I, 4-II, 4-III, 4-IV, 4-V and mould; Foil gauge 4-I, 4-II, 4-III, 4-IV, 4-V are fixed on the plate 3 corresponding test points, and foil gauge 4-I, 4-II, 4-III, 4-IV, 4-V are connected with statical strain indicator 6 through lead 5, and mould comprises punch die 1 and die 2; Die 2 is provided with the groove 7 that is used to place foil gauge with the corresponding position of test point, and groove 7 is on the line of symmetry of the front and back of die.Foil gauge is placed in the groove 7.Statical strain indicator is 1/4 ridge method, and the foil gauge of all test points is wired to the AB brachium pontis of statical strain indicator, and the shared one piece of compensating plate of the foil gauge of all test points is connected to the public compensation brachium pontis of statical strain indicator.
Embodiment 2
A kind of real-time strain measurement method of drawing may further comprise the steps:
(1) the real-time strain gauge means of outfit drawing: comprise the mould that statical strain indicator 6, lead 5, foil gauge 4-I, 4-II, 4-III, 4-IV etc. and punch die 1 and die 2 are formed, statical strain indicator is 1/4 ridge method;
(2) according to the workpiece deformation characteristics; As shown in Figure 2; At workpiece different deformation place and position with differently strained characteristics; The both sides of the bent angle of stretch wrap forming: w1 place and w2 place, and be that the surface (M face) that contacts with die confirms that upward some positions are test point, are attached to foil gauge 4-I, 4-II, 4-III, 4-IV, 4-V respectively on the corresponding test point;
(3) the corresponding position of in die and step (2), confirming of test point processes groove 7; The position is as shown in Figure 3; The foil gauge that sticks on the workpiece test point is placed in the corresponding groove 7; The foil gauge of each test point connects the AB brachium pontis of described statical strain indicator through lead, and the lead that is connected with foil gauge is drawn by groove 7, and the shared one piece of compensating plate of foil gauge connects the public compensation brachium pontis of statical strain indicator;
(4) with the segmentation of punch die stroke, workpiece gradation punching press is accomplished, and carries out data test respectively after end of a period of each section stroke and the release, can obtain the real-time strain value of workpiece drawing in the punching course.
Embodiment 3
Among Fig. 1, present embodiment is used for measuring in real time the ess-strain of a diel at U-shaped spare punching course plate (workpiece) 3.In the present embodiment, as shown in Figure 4, on the flange of U-shaped spare, receive stretching wall and test specimen (workpiece) bottom near a certain side, the U-shaped spare of bending angle, get five key points (test point) altogether; These positions are stressed the most abominable or approaching worst positions of mould in the U-shaped spare forming process, have guaranteed that dependent variable is in the scope of application of foil gauge.In order to guarantee that foil gauge 4 and lead 5 are not influenced by mould in punching course,, on die 2 position corresponding, process the groove 7 of the certain width and the degree of depth with key point, foil gauge is placed on the groove 7, and lead is drawn from groove 7.Statical strain indicator utilizes 1/4 ridge method; Receive all test points on the AB brachium pontis of statical strain indicator in advance; The shared one piece of compensating plate of all test points is connected on the public compensation brachium pontis of statical strain indicator, utilizes the test point conversion keys to read the strain of each test point simultaneously.
During the present embodiment course of work, at first open the power supply of statical strain indicator, the energising preheating is initially returned to zero by the balance key, and by the key assignments correction factor is set, statical strain indicator is in and begins the measurement state.Punch die carries out punching press, divides three sections with the punch die stroke, divides three punching presses to accomplish.Each section punch die stroke is ended, and carries out a strain measurement, record data; Test again can be confirmed overstrain after the release.Before the beginning of descending LAP, stick new foil gauge again, so that descend the measurement of LAP.

Claims (2)

1. the real-time strain gauge means of a drawing comprises statical strain indicator, lead, foil gauge and mould, and foil gauge is fixed on the selected test point of workpiece; Foil gauge is connected with statical strain indicator; Described mould comprises punch die and die, it is characterized in that, the corresponding position of described die and test point is provided with the groove that is used to place foil gauge; Said foil gauge is placed in the groove; Described statical strain indicator is 1/4 ridge method, and foil gauge is wired to the AB brachium pontis of described statical strain indicator, and the shared one piece of compensating plate of said foil gauge connects the public compensation brachium pontis of said statical strain indicator.
2. the real-time strain measurement method of a drawing is characterized in that, may further comprise the steps:
(1) the real-time strain gauge means of outfit drawing: comprise the mould that statical strain indicator, lead, foil gauge and punch die and die are formed, statical strain indicator is 1/4 ridge method;
(2) according to the workpiece deformation characteristics, at workpiece different deformation place and the position with differently strained characteristics, confirm some test points: for the workpiece of stretch wrap forming, test point is chosen in the both side surface of bent angle; Strain measurement in real time for ease, test point are chosen on workpiece and the surface that die contacts;
(3) the corresponding position of in die and step (2), confirming of test point processes groove; Foil gauge and connection lead are placed in the groove; The foil gauge of each test point connects the AB brachium pontis of described statical strain indicator through lead, and the shared one piece of compensating plate of foil gauge connects the public compensation brachium pontis of statical strain indicator;
(4) with the segmentation of punch die stroke, workpiece gradation punching press is accomplished, and carries out data test respectively after end of a period of each section stroke and the release, can obtain the real-time strain value of workpiece drawing in the punching course.
CN201110200447XA 2011-07-18 2011-07-18 Real-time strain measurement apparatus for stamping and forming and test method thereof Pending CN102359774A (en)

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105921581A (en) * 2016-05-30 2016-09-07 湖南大学 Device and method for measuring deformation of drawing die of automobile covering part
CN106595466A (en) * 2016-11-11 2017-04-26 暨南大学 Surface recess value test method and device for seat or sofa
CN109780987A (en) * 2018-12-29 2019-05-21 中国石油天然气集团有限公司 Strain gauge adhesion localization method in a kind of oil-gas pipeline depressed deformation strain field measurement
CN110666016A (en) * 2018-07-03 2020-01-10 金丰机器工业股份有限公司 Multi-point strain detection system of punching machine
CN111141235A (en) * 2019-12-31 2020-05-12 浙江合众新能源汽车有限公司 Utensil is assisted in quick discernment punching press sheet material deformation
CN111879606A (en) * 2020-09-15 2020-11-03 中南大学 Large-size shale sample true triaxial loading hydraulic fracturing strain measurement device

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
《中国新技术新产品》 20101231 卞步喜,夏晶,钟文龙 "材料力学纯弯梁电测仿真实验研制与实践" , 第16期 *
《农业装备与车辆工程》 20091231 张霞,陈靖芯,李红,高建和 "U形件多角拉弯成形时的应变及其对回弹影响" , 第5期 *
卞步喜,夏晶,钟文龙: ""材料力学纯弯梁电测仿真实验研制与实践"", 《中国新技术新产品》 *
张霞,陈靖芯,李红,高建和: ""U形件多角拉弯成形时的应变及其对回弹影响"", 《农业装备与车辆工程》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105921581A (en) * 2016-05-30 2016-09-07 湖南大学 Device and method for measuring deformation of drawing die of automobile covering part
CN105921581B (en) * 2016-05-30 2017-12-12 湖南大学 A kind of measuring method of Automobile Cover Drawing Die deflection
CN106595466A (en) * 2016-11-11 2017-04-26 暨南大学 Surface recess value test method and device for seat or sofa
CN106595466B (en) * 2016-11-11 2019-07-19 暨南大学 The test method and device of a kind of seat or the recessed value in sofa surface
CN110666016A (en) * 2018-07-03 2020-01-10 金丰机器工业股份有限公司 Multi-point strain detection system of punching machine
CN109780987A (en) * 2018-12-29 2019-05-21 中国石油天然气集团有限公司 Strain gauge adhesion localization method in a kind of oil-gas pipeline depressed deformation strain field measurement
CN111141235A (en) * 2019-12-31 2020-05-12 浙江合众新能源汽车有限公司 Utensil is assisted in quick discernment punching press sheet material deformation
CN111879606A (en) * 2020-09-15 2020-11-03 中南大学 Large-size shale sample true triaxial loading hydraulic fracturing strain measurement device

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Application publication date: 20120222

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