CN203429211U - Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side - Google Patents
Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side Download PDFInfo
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- CN203429211U CN203429211U CN201320533939.5U CN201320533939U CN203429211U CN 203429211 U CN203429211 U CN 203429211U CN 201320533939 U CN201320533939 U CN 201320533939U CN 203429211 U CN203429211 U CN 203429211U
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Abstract
The utility model discloses an anti-fatigue manufacturing device for micro-extrusion of a R-shaped surface of a metal part hole side. In order to make up the defects that only is the hole wall of a hole acted by the reinforcing function but the hole side is not conspicuously acted in the cold extrusion reinforcing process, the anti-fatigue manufacturing device comprises an upper extrusion head and a lower extrusion head which are respectively positioned on upper and lower side surfaces of a test piece metal part hole, wherein the lower part of the upper extrusion head and the upper part of the lower extrusion head are both positioned inside the metal part hole; the upper extrusion head and the lower extrusion head are both provided with extrusion head round angles; bolt holes are formed in the upper and lower extrusion heads; pulling bolts which penetrate through the bolt holes are connected with external pressure equipment. According to the anti-fatigue manufacturing device, certain load action is mainly exerted to the R-shaped surface of the hole side, the hole side is subjected to partial micro plastic deformation, and the macroscopic outline and the surface completeness of the R-shaped surface are changed, so that the anti-fatigue property of the hole side is improved. The anti-fatigue manufacturing device is small in used load, free of damage to parts, capable of directly reinforcing fatigue weak areas, and remarkable in anti-fatigue effect.
Description
Technical field
The utility model relates to the Anti-fatigue manufacture field of R part, limit, metal parts aperture hole, is specially the Anti-fatigue manufacture device of the micro-extruding of limit, a kind of metal parts hole R profile.
Background technology
Failure analysis result shows, fracture 80% occurs aviation part 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 declines.And part fatigue cracking germinates in 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 facing in engineering application.
Anti-fatigue manufacture technology is that to control, improve material and parts surface integrity be means, take the class technology that to improve fatigue property be target.The most frequently used Anti-fatigue manufacture technology of hole in piece part is cold extrusion intensifying technology, cold extrusion strengthening is used to have after certain shrink range plug passes aperture by force and is formed certain viscous deformation, and in strengthening layer, the improvement of unrelieved stress and microtexture has remarkable effect to improving hole fatigue property.Hole cold extrusion intensifying technology strengthening position is hole wall, not obvious to the effect of limit, hole, and limit, hole is the most serious position of stress concentration, is subject to load maximum and the position of repeated stress failure the most easily occurs in namely military service process.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.
Utility model content
In order to make up in the cold extrusion strengthening process in hole, just hole wall is produced to strengthening effect, and to the unconspicuous shortcoming of limit, hole strengthening effect, the utility model aims to provide the Anti-fatigue manufacture device of the micro-extruding of limit, a kind of metal parts hole R profile, by this device, can make that limit, hole R macro contours becomes more level and smooth, 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 scheme that the utility model adopts 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 testpieces metal parts hole upper and lower side, on this, the top of the bottom of extrusion head and lower extrusion head is all positioned at metal parts hole, and upper extrusion head and lower extrusion head all have the extrusion head fillet matching with limit, metal parts hole R profile; On described upper extrusion head and lower extrusion head, have bolt hole, through pulling out of this bolt hole, draw the bolt head of bolt to be positioned at the upper surface of extrusion head, pull out and draw the screw rod of bolt to be connected with external pressure equipment.
Be below the technical scheme of further improvement of the utility model:
According to embodiment of the present utility model, 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.
While adopting the utility model to carry out the antifatigue technique of the micro-extruding of limit, metal parts hole R profile, comprise the steps:
1) be ready to manometric press device, select the extrusion head matching with testpieces metal parts aperture Ji Kong limit R;
2) remove extrusion head and metal parts hole dirt around, the two side holes limit R that upper and lower extrusion head is placed in respectively to 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, exerts pressure to metal parts hole limit R by drawing bolt, reaches after 20MPa ~ 28MPa, keeps force value for some time constant, and then unloading pressure, takes out testpieces.
Reach after the force value of regulation, keep 6 ~ 10 seconds preferably constant time of force value.
In view of said structure, the utility model 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, 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 being 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 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, limit, hole R for given material and aperture, 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
The squeeze that adopts above-mentioned selected compression tool and determine, carries out mechanical force extruding to limit, the hole R in given material and aperture, to reach required small flow amount, improves the fatigue property of pored component.
Compared with prior art, the beneficial effects of the utility model are:
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 antifatigue effect is more remarkable.
Below in conjunction with drawings and Examples, the utility model is further elaborated.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the utility model Anti-fatigue manufacture device;
Fig. 2 is 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 being 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 pored component fatigue property.
The present embodiment take that to adopt the utility model 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 match with Ji Kong limit, metal parts aperture R;
2) remove extrusion head and metal parts hole dirt around, the two side holes limit R that extrusion head is placed in respectively to metal parts hole is upper, the centre hole by drawing bolt through upper and lower extrusion head, and be connected with press device, fix;
3) trigger pressure equipment, exerts pressure to metal parts hole, reaches after 25MPa, keeps force value not alter an agreement for 6 ~ 10 seconds, and unloading pressure, takes out testpieces 1.
Under external force squeezing action, will there is the change of both macro and micro pattern in limit, hole, and on extruding top layer, forms the strengthening layer of certain depth, and as shown in Figure 4, 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, rounding processing has been carried out in limit, hole, but due to process tool and not laminating completely of workpiece surface, cause hole Edge Blend face to have corner angle, after Kong Bianwei extruding, corner angle are removed, and hole wall and outside surface have formed rounding off.Under 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 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 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 external load at the stress causing of 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 the aperture to A-100 steel Ф 15mm, limit, hole adopts 25MPa load to carry out after micro-extrusion process, and 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 utility model, and be not used in restriction scope of the present utility model, after having read the utility model, 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 utility model.
Claims (3)
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 testpieces (1) metal parts hole upper and lower side, the top of the bottom of extrusion head on this (2) and lower extrusion head (4) is all positioned at 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; On described upper extrusion head (2) and lower extrusion head (4), have bolt hole, through pulling out of this bolt hole, draw the bolt head of bolt (5) to be positioned at the upper surface of extrusion head (2), pull out and draw the screw rod of bolt (5) to 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320533939.5U CN203429211U (en) | 2013-08-30 | 2013-08-30 | Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320533939.5U CN203429211U (en) | 2013-08-30 | 2013-08-30 | Anti-fatigue manufacturing device for micro-extrusion of R-shaped surface of metal part hole side |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468898A (en) * | 2013-08-30 | 2013-12-25 | 中航飞机起落架有限责任公司 | Micro-extrusion antifatigue manufacturing device and technology of R molded surface on hole side of metal part |
| CN104372273A (en) * | 2014-09-18 | 2015-02-25 | 合肥金海康五金机械制造有限公司 | Soft base alloy high finish inner hole finishing strengthening method |
| CN111975284A (en) * | 2020-08-20 | 2020-11-24 | 东风商用车有限公司 | Extrusion die and method for improving fatigue strength of hole end of metal plate |
-
2013
- 2013-08-30 CN CN201320533939.5U patent/CN203429211U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468898A (en) * | 2013-08-30 | 2013-12-25 | 中航飞机起落架有限责任公司 | Micro-extrusion antifatigue manufacturing device and technology of R molded surface on hole side of metal part |
| CN103468898B (en) * | 2013-08-30 | 2015-04-08 | 中航飞机起落架有限责任公司 | Micro-extrusion antifatigue manufacturing device and technology of R molded surface on hole side of metal part |
| CN104372273A (en) * | 2014-09-18 | 2015-02-25 | 合肥金海康五金机械制造有限公司 | Soft base alloy high finish inner hole finishing strengthening method |
| CN104372273B (en) * | 2014-09-18 | 2016-08-17 | 安徽海凌精工科技有限公司 | A kind of finishing intensifying method of soft base alloy best bright finish endoporus |
| CN111975284A (en) * | 2020-08-20 | 2020-11-24 | 东风商用车有限公司 | Extrusion die and method for improving fatigue strength of hole end of metal plate |
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| GR01 | Patent grant | ||
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Granted publication date: 20140212 |