CN110031314A

CN110031314A - A kind of material rolling experimental method

Info

Publication number: CN110031314A
Application number: CN201910458839.2A
Authority: CN
Inventors: 严庆光; 王瑞; 吕振华; 王瑛玮; 马仲男
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2019-07-19

Abstract

The present invention relates to a kind of material rolling experimental methods, it is identified in advance in the rolling area of sample, one piece of imitation whole sample is stitched and fastened with rectangle sample, to push against progress rolling processing at the two samples abutting gap of power abutting together and cause impression, it then removes abutting power and separates sample, compare the variation that rolling area generates front and back home position and shape, the deformation direction of the direction of material plasticity rheology and amount of plastic deformation and plastic zone external elastic deformed area within the scope of plastic zone can be studied, it is pushed against in experimentation and tries hard to keep that demonstrate,prove two adjacent samples to joint close gap (3) be not in instantaneous open or the case where the changing of the relative positions, the research of the variation of variation and intersection point (11) array that draws lines to setting-out intersection point (9) array, can help we obtain within the scope of plastic zone the direction of material plasticity rheology and amount of plastic deformation with And the information such as deformation direction of plastic zone external elastic deformed area.

Description

A kind of material rolling experimental method

Technical field

The present invention relates to a kind of material rolling experimental method, this material rolling experimental method is related to carrying out material surface Rolling is handled to improve the research of material surface stress distribution.

Background technique

Rolling is that one kind can not only form material in material internal formation radial compressive stress without cutting technology Plastic zone inside material, but also the finish on surface can be improved, it is a kind of processing technology of high-efficiency low energy consumption.

Material after rolling can effectively improve its fatigue strength because there are compressive pre-stresses inside it, extend The active time of material.

But at present for inner micro plastic area after rolling distribution situation still without good research means, can only borrow The method of finite element is helped to be probed into indirectly.

Yu Zhefu etc. utilizes limited element analysis technique in " method that impression measurement residual stress is hit in rolling force direction " text Analyze the pattern of plastic zone.

Summary of the invention

201710803714.X is a kind of revolving body rolling experimental method, although having obtained intuitive and image plastic zone model It encloses and shape information, but can not study within the scope of plastic zone outside the direction of material plasticity rheology and amount of plastic deformation and plastic zone Enclose the rolling direction in elastic rolling area.

Solution provided by the invention is to mark in advance on the basis of 201710803714.X in the rolling area of sample Know, stitch and fasten one piece of imitation whole sample with rectangle sample, is pushing against seam to push against two samples that power is against together Rolling processing is carried out at gap and causes impression, is then removed abutting power and is separated sample, comparison rolling deformed area generates front and back mark The variation of location and shape can study the direction of material plasticity rheology and amount of plastic deformation and plastic zone within the scope of plastic zone The deformation direction of external elastic deformed area.

Rectangle sample, longest four planar accurate grindings processing, to reach as high as possible is made in detected materials first Flatness and finish influence the subsequent observation to setting-out in order to avoid refining the grinding trace that leaves, refine feed direction and The setting-out of all directions is in maximum angle, and portrays grid lines.

Drawing lines is one group of parallel lines for being parallel to specimen length direction.

It draws lines as one group of parallel lines perpendicular to specimen length direction.

It draws lines and is while drawing one group of parallel lines for being parallel to specimen length direction and perpendicular to specimen length direction One group of parallel lines, this two groups of parallel lines form multiple intersection points.

In order to which rule is preferably presented, one group of parallel lines for being parallel to specimen length direction are equidistant line, perpendicular to examination One group of parallel lines of sample length direction are equidistant line.

Secondly, two or more sample U-shaped frames and compression beam are clamped and compressed, this will ensure to try in the process Upper and lower two big coplanar flats that sample is lined up make rolling be directed at two samples and support the suture closed, load according to scheduled load, Obtain rolling impression.

It removes and pushes against power and separate sample, bring is parallel to specimen length direction due to rolling in appearance on former abutting face One group of parallel lines and perpendicular to length direction one group of parallel lines bending and this two groups of parallel lines form multiple intersection point positions The variation set helps us to obtain the direction of material plasticity rheology and plastic deformation within the scope of plastic zone the research of these variations The information such as the deformation direction of amount and plastic zone external elastic deformed area.

Detailed description of the invention

Fig. 1 is a kind of material rolling experimental method implementation process schematic diagram: 1 is U-typed frame；2 be band sample；3 be item Shape sample pushes against gap；4 be rolling force direction；5 be rolling；6 be compression beam；7 be hold-down bolt.

Fig. 2 is band sample: 8 be test block.

Fig. 3 is 8 enlarged diagram of test block: 9 be the setting-out intersection point on loading surface, and 10 be the arris of sample, and 11 be abutting Setting-out intersection point on face.

Specific embodiment

The following are one embodiment of the present of invention, more embodiments can be in conjunction with the one or more features of the present embodiment It obtains.

Two or more the unified fine grinding of band sample 2, length of the machining direction of fine grinding with band sample 2 Direction is at 45 °, draws equidistant parallel lines, forms the array of the setting-out intersection point 9 on loading surface, the setting-out intersection point 11 on abutting face Array.

Two or more 2 stay aligned of band sample into U-typed frame 1, two through-holes in compression beam 6 with Two threaded holes on 1 top of U-typed frame are opposite, and screwing in hold-down bolt 7 makes compression beam 6 and U-typed frame 1 compress band sample 2, shape The abutting power being in strip between sample 2, this abutting is tried hard to keep in experimentation, and to push against gaps 3 be not in any to two samples of card Instantaneous opening or the case where the changing of the relative positions.

So that rolling 5 is directed at the abutting gap 3 of band sample 2 and apply rolling power, rolling 5 pushes against at gap 3 in band sample Rolling goes out plastic zone trace.

Hold-down bolt 7 is screwed out, unclamps, remove band sample 2, can observe loading surface in the upper surface of band sample 2 On setting-out 9 array of intersection point variation, the abutting face of band sample 2 be able to observe that setting-out 11 array of intersection point variation.

The research of the variation of variation and 11 array of intersection point that draws lines to setting-out 9 array of intersection point, can help us to be moulded The direction of material plasticity rheology and the deformation direction etc. of amount of plastic deformation and plastic zone external elastic deformed area within the scope of property area Information.

Claims

1. a kind of material rolling experimental method is it is characterized in that: the rolling area in sample identifies in advance, with several piece rectangle sample One piece of imitation whole sample is stitched and fastened, is pushed against at gap at progress rolling to push against two samples that power pushes against together Impression is managed and caused, abutting power is then removed and separates sample, comparison rolling area generates the variation of front and back home position and shape, energy Enough study the direction of material plasticity rheology and the change of amount of plastic deformation and plastic zone external elastic deformed area within the scope of plastic zone Shape direction screws out hold-down bolt (7), unclamps, removes band sample (2), can observe and add in the upper surface of band sample (2) The variation of setting-out intersection point (9) array on section can observe setting-out intersection point (11) array in the abutting face of band sample (2) Variation.

2. a kind of material rolling experimental method according to claim 1 is it is characterized in that: draw lines to be parallel to band sample (2) One group of parallel lines of length direction.

3. a kind of material rolling experimental method according to claim 1 is it is characterized in that: draw lines as perpendicular to band sample (2) One group of parallel lines of length direction.

4. a kind of material rolling experimental method according to claim 1 is while drawing and be parallel to item it is characterized in that: drawing lines One group of parallel lines of shape sample (2) length direction and one group of parallel lines perpendicular to band sample (2) length direction, this two groups flat Line forms multiple intersection points.

5. a kind of material rolling experimental method according to claim 1 is parallel to it is characterized in that: in order to which rule is preferably presented One group of parallel lines of band sample (2) length direction are equidistant line, parallel perpendicular to one group of band sample (2) length direction Line is equidistant line.

6. a kind of material rolling experimental method according to claim 1 is it is characterized in that: have abutting power between band sample (2), It is not in instantaneous open or the feelings of the changing of the relative positions that this abutting, which tries hard to keep and demonstrate,proves two adjacent samples to joint close gap (3), in experimentation Condition.

7. a kind of material rolling experimental method according to claim 1 it is characterized in that: to setting-out intersection point (9) array variation and The research of the variation of setting-out intersection point (11) array, can obtain the direction of material plasticity rheology and plastic deformation within the scope of plastic zone The information such as the deformation direction of amount and plastic zone external elastic deformed area.

8. a kind of material rolling experimental method according to claim 1 is it is characterized in that: the machining direction of fine grinding is tried with bar shaped The length direction angle at 45 ° of sample (2).