CN103468898A - Micro-extrusion antifatigue manufacturing device and technology of R molded surface on hole side of metal part - Google Patents
Micro-extrusion antifatigue manufacturing device and technology of R molded surface on hole side of metal part Download PDFInfo
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- CN103468898A CN103468898A CN2013103853868A CN201310385386A CN103468898A CN 103468898 A CN103468898 A CN 103468898A CN 2013103853868 A CN2013103853868 A CN 2013103853868A CN 201310385386 A CN201310385386 A CN 201310385386A CN 103468898 A CN103468898 A CN 103468898A
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Abstract
The invention discloses a micro-extrusion antifatigue manufacturing device and a technology of an R molded surface on a hole side of a metal part. In order to overcome the disadvantages that only a hole wall is reinforced, but a reinforcing effect on the hole side is not obvious during cold extrusion and reinforcing of a hole, the antifatigue manufacturing device comprises an upper extrusion head, a lower extrusion head which are positioned on the upper side face and the lower side face of the hole of the metal part of a test article, wherein the lower part of the upper extrusion head and the upper part of the lower extrusion head are positioned in the hole of the metal part; the upper extrusion head and the lower extrusion head are provided with extrusion head fillets; bolt holes are formed in the upper extrusion head and the lower extrusion head; and a drawing bolt penetrating through the bolt holes is connected with external pressure equipment. According to the device and the technology, the R molded surface has local micro plastic deformation mainly by applying a certain load effect on the R molded surface on the hole side, a macro outline and surface integrality of the R molded surface are changed, and the fatigue resistance of the R molded surface is improved. According to the device and the technology, an applied load is smaller, the part cannot be damaged, a fatigue weakness area is reinforced directly, and an antifatigue effect is significant.
Description
Technical field
The present invention relates to the Anti-fatigue manufacture field of R part, limit, metal parts aperture hole, be specially Anti-fatigue manufacture device and the technique of the micro-extruding of limit, a kind of metal parts hole R profile.
Background technology
The failure analysis result shows, aviation part fracture 80% is to occur in tired mode, therefore having relatively high expectations to its fatigue property.Along with part material intensity increases, but the consequent is that its stress concentration susceptibility is high, and its fatigue strength is with stress concentration factor (K
t) raising of value significantly descends.And the part fatigue cracking germinates in the stress concentration position more.Hole on part is the discontinuous place of structure, is also modal stress concentration form in part, and the fatigue property that how to improve pored component is the large realistic problem faced in the engineering application.
The Anti-fatigue manufacture technology is that to control, improve the material and parts surface integrity be means, take and improves the class technology that fatigue property is target.The most frequently used Anti-fatigue manufacture technology of hole in piece part is the cold extrusion intensifying technology, the cold extrusion strengthening is used has certain shrink range plug by force through forming certain viscous deformation after aperture, and in strengthening layer, the improvement of unrelieved stress and microtexture has remarkable effect to improving the hole fatigue property.Hole cold extrusion intensifying technology strengthening position is hole wall, not obvious to the effect of limit, hole, and the limit, hole is the most serious position of stress concentration, is subject to the load maximum in namely military service process and the position of repeated stress failure the most easily occurs.Therefore, the Anti-fatigue manufacture on limit, hole is the most important thing that manufacture in hole, is also the gordian technique that whole part is manufactured.
Summary of the invention
In order in the cold extrusion strengthening process that makes up hole, just hole wall to be produced to strengthening effect, and to the unconspicuous shortcoming of limit, hole strengthening effect, the present invention aims to provide Anti-fatigue manufacture device and the technique of the micro-extruding of limit, a kind of metal parts hole R profile, this technique makes that limit, hole R macro contours becomes more level and smooth, the processing tool marks shoal and residual stress state improves, thereby extend its fatigue lifetime, improve its anti-fatigue performance.
To achieve these goals, the technical solution adopted in the present invention is:
The Anti-fatigue manufacture device of the micro-extruding of limit, a kind of metal parts hole R profile, it is characterized in that, comprise the upper extrusion head and the lower extrusion head that lay respectively at upper and lower side, testpieces metal parts hole, bottom that should upper extrusion head and the top of lower extrusion head all are positioned at the metal parts hole, and upper extrusion head and lower extrusion head all have the extrusion head fillet matched with limit, metal parts hole R profile; Have bolt hole on described upper extrusion head and lower extrusion head, through the upper surface that the bolt head that draws bolt is positioned at extrusion head of pulling out of this bolt hole, pull out the screw rod that draws bolt and be connected with external pressure equipment.
Be below the technical scheme of further improvement of the present invention:
According to embodiments of the invention, the aperture in described metal parts hole is preferably 10mm ~ 20mm.
In order to guarantee to obtain reasonable micro-squeezing effect, the cambered surface radius of described extrusion head fillet is metal parts hole rounding radius R ~ R+0.05mm.
Further, the antifatigue technique that the present invention also provides a kind of Anti-fatigue manufacture device of the above-mentioned micro-extruding of limit, metal parts hole R profile to carry out the micro-extruding of limit, metal parts hole R profile, comprise the steps:
1) be ready to manometric press device, select the extrusion head be complementary with testpieces metal parts aperture Ji Kong limit R;
2) remove extrusion head and metal parts hole dirt on every side, the two side holes limit R that upper and lower extrusion head is placed in respectively to the metal parts hole is upper, the centre hole by the screw rod of drawing bolt through upper and lower extrusion head, and be fixedly linked with press device;
3) trigger pressure equipment, exert pressure to metal parts hole limit R by the drawing bolt, after reaching 20MPa ~ 28MPa, keeps force value for some time constant, and then unloading pressure, take out testpieces.
After reaching the force value of regulation, keep 6 ~ 10 seconds preferably constant time of force value.
In view of said structure, the present invention is to use extrusion head for the process characteristic of the Anti-fatigue manufacture technology of R part, limit, metal parts aperture hole, under the effect of mechanical force, make limit, hole R profile that local small viscous deformation occurs, make that its macro contours becomes more level and smooth, the processing tool marks shoal and residual stress state improves, thereby extend its fatigue lifetime, improve its anti-fatigue performance; Specific implementation method is:
1, the first step: selected rational compression tool
Compression tool comprises dedicated extrusion head and press device.Dedicated extrusion head can be according to Ji Kong limit, aperture R self design.Press device should be according to design of part and field condition, the equipment such as available hydraulic or lathe, but pressure is readable and controlled.
2, second step: the micro-squeeze test of limit, hole R profile, determine that limit, the hole R profile be extruded produces the required squeeze of small flow amount
R profile small flow amount in limit, hole is difficult for measuring, but can observe by the variation of surface topography, and weighs its effect by the testpieces fatigue test, indirectly reflects its flow amount.Because differing materials reaches the desirable required small flow amount difference of antifatigue effect, and limit, the various hole R profile of same material different pore size will produce also difference of the required squeeze of a certain small flow amount, therefore, for given material and Kong limit, aperture R, design various power values, carry out fatigue test to determine rational squeeze.Squeeze is too small, and limit, hole R profile does not produce distortion or is out of shape too smallly, and strengthening effect is not obvious, and squeeze is excessive, is out of shape excessively, easily produces tiny crack, offsets strengthening effect.
3, the 3rd step: the micro-extrusion processing of limit, hole R profile
Adopt above-mentioned selected compression tool and the squeeze of determining, given material and Kong limit, aperture R are carried out to the mechanical force extruding, to reach required small flow amount, improve the fatigue property of pored component.
Compared with prior art, the invention has the beneficial effects as follows:
1) R profile micro-extrusion technique maneuvering load in limit, hole is less, can not cause damage to part;
2) R profile micro-extrusion technique in limit, hole is directly strengthened tired weak area, and the antifatigue effect is more remarkable.
Below in conjunction with drawings and Examples, the present invention is further elaborated.
The accompanying drawing explanation
Fig. 1 is the structure principle chart of Anti-fatigue manufacture device of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the partial enlarged drawing at I place in Fig. 2;
Fig. 4 is top layer pattern schematic diagram before and after the micro-extruding in aperture;
Fig. 5 is aperture macro contours outside view before and after the micro-extruding in aperture;
Fig. 6 is aperture micro-extruding front and rear surfaces pattern contrast schematic diagram.
In the drawings
1-testpieces; 2-upper extrusion head; 3-limit, the hole R that is extruded; 4-lower extrusion head;
5-drawing bolt; 6-extrusion head fillet.
Embodiment
The Anti-fatigue manufacture device of the micro-extruding of limit, a kind of metal parts hole R profile, Fig. 1 and 2 be testpieces 1 in process of the test, upper extrusion head 2 and 4 and drawing bolt 5 between position relationship, drawing bolt 5 is connected with external pressure equipment, produce pulling force, make extrusion head 2 and lower extrusion head 4 do move toward one another, thereby limit, the hole R that the 6 pairs of testpieces of fillet that make extrusion head 2 and 4 are extruded 3 produces squeeze, make it that small viscous deformation occur, change its macro contours and surface integrity, thereby improve its anti-fatigue performance.Wherein, upper and lower extrusion head 2,4 fillets are R+0.05 0, and wherein R is the hole Edge Blend be extruded.Control punch limit R, extrusion head fillet, squeeze, make limit, hole R profile that suitable small viscous deformation occur, and is the key that improves the pored component fatigue property.
The present embodiment take that to adopt the present invention to implement micro-extruding strengthening to Ф 15 limits, aperture hole on draw-pulling fatigue experimental of ultrahigh-strength steel 23Co14Ni12Cr3MoE (A-100) steel part be example, and concrete steps are as follows:
1) be ready to press device (with tensimeter), select two extrusion heads 2,4 that are complementary with Ji Kong limit, metal parts aperture R;
2) remove extrusion head and metal parts hole dirt on every side, the two side holes limit R that extrusion head is placed in respectively to the metal parts hole is upper, the centre hole by the drawing bolt through upper and lower extrusion head, and be connected with press device, fix;
3) trigger pressure equipment, exert pressure to the metal parts hole, after reaching 25MPa, keeps force value not alter an agreement for 6 ~ 10 seconds, and unloading pressure, take out testpieces 1.
The change of both macro and micro pattern, under the external force squeezing action, will occur in the limit, hole, and forms the strengthening layer of certain depth on the extruding top layer, and as shown in Figure 4, the concrete variation is embodied in following three aspects:
1) before and after limit, the aperture hole intensive treatment of contrast A-100 steel Ф 15mm, macro contours is shown in Fig. 5, before processing, the rounding processing has been carried out in the limit, hole, but due to process tool and not laminating fully of workpiece surface, cause hole Edge Blend face that corner angle are arranged, after the Kong Bianwei extruding, corner angle are removed, and hole wall and outside surface have formed rounding off.Under the part loaded state, rounding off has less stress concentration.
2) before and after limit, the aperture hole intensive treatment of contrast A-100 steel Ф 15mm, microscopic appearance is shown in Fig. 6, extruding front surface processing tool marks are darker, and the surface roughness Ra value is 1.0 μ m, and after micro-extruding strengthening, the tool marks degree of depth shoals, part is removed, and the surface roughness Ra value is reduced to 0.3 μ m.
3) intensive treatment front and back, limit, the aperture hole surface residual stress value of contrast A-100 steel Ф 15mm is in Table 1, limit, hole untreated testpieces residual compressive stress value is lower, face value only-150MPa, micro-extrusion process metapore limit residual compressive stress value increases substantially, reach-485MPa of face value, and in the residual compressive stress value of still have-155MPa of the position of the degree of depth 120 μ m.
Residual-stress value contrast table before and after the extruding of limit, table 1 hole
Fatigue Life Comparison table before and after the extruding of limit, table 2 hole
The effect that above-mentioned front two aspects change is the surface stress collected state of having improved part, reduces the stress that causes of external load in position, limit, hole, and the increase of third aspect residual compressive stress value is the actual effective stress that has reduced position, limit, hole.Under the acting in conjunction of three aspects:, significantly improve the fatigue lifetime of testpieces, the data declaration in table 2, and to the aperture of A-100 steel Ф 15mm, after the limit, hole adopts 25MPa load to carry out micro-extrusion process, fatigue lifetime, gain was greater than 40 times.
The content that above-described embodiment is illustrated should be understood to these embodiment only for being illustrated more clearly in the present invention, and be not used in, limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Claims (4)
1. the Anti-fatigue manufacture device of the micro-extruding of metal parts hole limit R profile, it is characterized in that, comprise the upper extrusion head (2) and the lower extrusion head (4) that lay respectively at upper and lower side, testpieces (1) metal parts hole, bottom that should upper extrusion head (2) and the top of lower extrusion head (4) all are positioned at the metal parts hole, and upper extrusion head (2) and lower extrusion head (4) all have and metal parts hole limit R(3) the extrusion head fillet (6) that matches of profile; Have bolt hole on described upper extrusion head (2) and lower extrusion head (4), through the upper surface that the bolt head that draws bolt (5) is positioned at extrusion head (2) of pulling out of this bolt hole, pull out the screw rod that draws bolt (5) and be connected with external pressure equipment.
2. the Anti-fatigue manufacture device of the micro-extruding of limit, metal parts according to claim 1 hole R profile, is characterized in that, the aperture in described metal parts hole is 10mm ~ 20mm.
3. the Anti-fatigue manufacture device of the micro-extruding of limit, metal parts according to claim 1 hole R profile, is characterized in that, the cambered surface radius of described extrusion head fillet (6) is metal parts hole rounding radius R ~ R+0.05mm.
4. the antifatigue technique that the Anti-fatigue manufacture device that utilizes the micro-extruding of limit, metal parts hole R profile of one of claim 1-3 carries out the micro-extruding of limit, metal parts hole R profile, is characterized in that, comprises the steps:
1) be ready to the tensimeter press device, select and testpieces (1) metal parts aperture Ji Kong limit R(3) extrusion head (2,4) that is complementary;
2) remove extrusion head (2,4) and metal parts hole dirt on every side, by upper and lower extrusion head (2,4) be placed in respectively the two side holes limit R(3 in metal parts hole) on, centre hole by the screw rod of drawing bolt (4) through upper and lower extrusion head (2,4), and be fixedly linked with press device;
3) trigger pressure equipment, exert pressure to the metal parts hole by drawing bolt (4), after reaching 20MPa ~ 28MPa, keeps force value for some time constant, and then unloading pressure, take out testpieces (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674952A (en) * | 2017-09-15 | 2018-02-09 | 西安冠泰检测技术有限公司 | A kind of cold extrusion impressing coupling and intensifying process equipment and method |
| CN113109191A (en) * | 2021-03-26 | 2021-07-13 | 陕西飞机工业有限责任公司 | 2A50 and 2A14 alloy joint surface and R region strengthening method |
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| CN101412045A (en) * | 2008-11-21 | 2009-04-22 | 山东济宁车轮厂 | Method for processing wheel spoke nut seat hole |
| CN203429211U (en) * | 2013-08-30 | 2014-02-12 | 中航飞机起落架有限责任公司 | Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412045A (en) * | 2008-11-21 | 2009-04-22 | 山东济宁车轮厂 | Method for processing wheel spoke nut seat hole |
| CN203429211U (en) * | 2013-08-30 | 2014-02-12 | 中航飞机起落架有限责任公司 | Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674952A (en) * | 2017-09-15 | 2018-02-09 | 西安冠泰检测技术有限公司 | A kind of cold extrusion impressing coupling and intensifying process equipment and method |
| CN113109191A (en) * | 2021-03-26 | 2021-07-13 | 陕西飞机工业有限责任公司 | 2A50 and 2A14 alloy joint surface and R region strengthening method |
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