CN101020945A - Plastic deforming chamfer process to raise fatigue strength of hole and opening position - Google Patents
Plastic deforming chamfer process to raise fatigue strength of hole and opening position Download PDFInfo
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- CN101020945A CN101020945A CNA2007100104570A CN200710010457A CN101020945A CN 101020945 A CN101020945 A CN 101020945A CN A2007100104570 A CNA2007100104570 A CN A2007100104570A CN 200710010457 A CN200710010457 A CN 200710010457A CN 101020945 A CN101020945 A CN 101020945A
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- pressing mold
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- fatigue strength
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Abstract
The plastic deforming chamfer process to raise the fatigue strength of hole and opening position includes one step of cleaning the workpiece and classifying based on the sizes of holes and openings, one step of designing and making pressing molds in different shapes, and one step of mounting the workpiece and the pressing molds on the pressurizing apparatus and rolling chamfer in the rolling chamfer amount of 0.1-3 mm. The process can double the fatigue strength of the treated parts, and may be used widely in machine manufacture.
Description
Technical field
The present invention relates to utilize plastic deforming chamfer to improve the method for position, aperture fatigue strength.
Background technology
In the manufacturing and designing of Modern High-Speed, light-duty and high-power machinery, transport facility, the raising of structure and part parts fatigue strength more and more becomes the key issue that guarantees the operation and the security of the lives and property, and fatigue strength raising method has very big applied value and application prospects.
Because the requirement of structure or technology, nearly all structure or component all have circular hole, square hole or erose through hole or blind hole.Because the stress concentration that these orifice edge produce, under the effect of moving load, be that fatigue cracking produces and the direct inducement of expansion and cause structure or the rupture failure accident of part.Therefore, the aperture is the important factor of serious harm structure or component fatigue strength.
Common shot peening strengthening, hard surfacing etc. improve the method for fatigue strength, in most cases for position, aperture fatigue strength improve effect and not obvious, and complex process, technical qualification are strict; A kind of method---" cold expanding hole method " that improves hole in piece part oral area position fatigue strength that be specifically designed to, though have certain effect, the highest effect also only can bring up to original about 40～50%, but there is the problem of complex technical process equally in it, more be not easy to construct at the scene, make its range of application be subjected to considerable restraint.
Summary of the invention
The objective of the invention is to improve the fatigue strength of how much gap portions such as aperture of part with the method for plastic deforming chamfer.For the aperture of different shapes type, utilize corresponding simple metal mould, to come the component orifice edge is carried out chamfering by an amount of viscous deformation, this method is applicable to plastic metal materials such as ordinary steel iron material, stainless steel and non-ferrous metal.
Technical solution of the present invention is achieved in that
A kind of method of utilizing plastic deforming chamfer to improve position, aperture fatigue strength, comprise the step that workpiece is cleared up, cleaned and classifies by its port size size, the technological process that it is characterized in that this method also comprises the step of making conical pressing mold, spherical pressing mold, finger-type pressing mold and/or conformal pressing mold by the different orifice size design, be contained in workpiece and pressing mold on the known press device and roll and/or the step of roll extrusion chamfering, it is conical that the operate portions of wherein said conical pressing mold is, and the angular range of taper work portion is 35 °～75 °; Spherical pressing mold is a spheroid, and when the diameter of pressing mold is D, when the diameter of circular hole was d, its pass was D=1.22～1.74d; The finger-type pressing mold is a prism, is applicable to wide aperture or irregular aperture; Described conformal pressing mold is applicable to non-circular aperture, and the exterior contour of its working position is similar to orifice shapes, and its operate portions is taper, and the angle of taper work portion should be 30 °～110 °.
Mold pressing chamfering amount when described calendering and/or roll extrusion chamfering, the promptly vertical chamfering degree of depth is 0.1～3mm.
Described when utilizing finger-type pressing mold chamfering, in the seamed edge application of force of last aperture, should reach needed chamfering amount along the steady mobile frock of aperture seamed edge direction.
Compared with prior art, the invention has the advantages that the fatigue strength that can make component with holes brings up to about original 2 times, even can eliminate the harm of breach fully fatigue strength.Have the effect of common mechanical workout chamfering simultaneously concurrently, reach the purpose of killing two birds with one stone.This law technological process is simple, is fit to various scales, various working-yard is used, and the effect that improves fatigue strength is very remarkable, the safe range of stress in the time of can reaching no aperture, and its economic and social benefit is very considerable.
Description of drawings
Drawings attached 5 width of cloth of the present invention, wherein:
Fig. 1 is circular cone pressing mold and work synoptic diagram;
Fig. 2 is spherical pressing mold and work synoptic diagram;
Fig. 3 is finger-type pressing mold and work synoptic diagram;
Fig. 4 is a mold pressing chamfering amount synoptic diagram;
Fig. 5 is the plastic deforming chamfer flow process chart.
In the drawings: 1, conical pressing mold operate portions, 2, spherical pressing mold, 3, the finger-type pressing mold.
Embodiment
As Fig. 1～shown in Figure 5.
A kind of method of utilizing plastic deforming chamfer to improve position, aperture fatigue strength, after adopting conical pressing mold, spherical pressing mold, finger-type pressing mold and/or conformal pressing mold that orifice edge is carried out plastic deforming chamfer, make the edge in aperture produce work hardening, and form residual compressive stress.Work hardening and residual compressive stress are all brought into play very effective effect to the fatigue strength that improves orifice edge.Component are under the working conditions of elastic stress, and unrelieved stress may have release to a certain degree, but facts have proved that this release can not influence the raising effect of fatigue strength.Chamfering method provided by the invention comprises:
1, pressing mold example angle
Mainly be divided into conical pressing mold, spherical pressing mold, finger-type pressing mold and conformal pressing mold chamfering.
(a) conical pressing mold.It is conical that its working position is, and the angular range of taper work portion is 35 °～75 °.As shown in Figure 1.
(b) spherical pressing mold.Pressing mold is a spheroid, and when the diameter of pressing mold spheroid is D, when the diameter of circular hole was d, the pass of the two was D=1.22～1.74d.As shown in Figure 2.
(c) finger-type pressing mold.Pressing mold is a prism, and the prismatic purpose that realizes plastic deforming chamfer in rotary course is applicable to wide aperture circular hole or irregular aperture.As shown in Figure 3.
(d) conformal pressing mold.When being not circular hole, orifice shapes uses conformal pressing mold.Its principle of work is similar to the circular cone pressing mold, and the outline of pressing mold operate portions is identical with orifice shapes, and operate portions is taper, and the tapered clamp angular region is 30 °～110 °.For example, under the situation of Fig. 3, conformal pressing mold also should become five prismatics.
2, die material and hardness require: adopt die steel to quench and the low-temperaturetempering processing, hardness requires about HBC56～61.
3, technological process:
(a) smear metal at cleaning seamed edge place, processed aperture, dirt etc., and remove the part that the aperture seamed edge is a breach;
(b) part to be processed is fixed on the pressing machine, assurance part bottom is put down by the level holder or is fixing, and part is had enough anchorage forces;
(c) be pressed in the pressing mold top to adding, and slowly the mold pressing chamfering is carried out in pressurization, up to enough chamfering amounts with press ram;
(d) for the situation of finger-type pressing mold, the finger-type mould is installed on the special tooling, in the seamed edge application of force of last aperture,, reaches needed chamfering amount along the steady mobile frock of aperture seamed edge direction;
(e) mold pressing chamfering amount.The chamfering weight range is C0.1～C3, and the promptly vertical chamfering degree of depth is that 0.1～3mm sees Fig. 4.
Claims (3)
1, a kind of method of utilizing plastic deforming chamfer to improve position, aperture fatigue strength, comprise workpiece is cleared up, cleaning and the step of classifying by its port size size, the technological process that it is characterized in that this method also comprises by the different orifice size design makes conical pressing mold, spherical pressing mold, the step of finger-type pressing mold and/or conformal pressing mold, be contained in workpiece and pressing mold on the known press device and roll and/or the step of roll extrusion chamfering, it is conical that the operate portions of wherein said conical pressing mold is, and the angular range of taper work portion is 35 °～75 °; Spherical pressing mold is a spheroid, and when the diameter of pressing mold is D, when the diameter of circular hole was d, its pass was D=1.22～1.74d; The finger-type pressing mold is a prism, is applicable to wide aperture or irregular aperture; Described conformal pressing mold is applicable to non-circular aperture, and the exterior contour of its working position is similar to orifice shapes, and its operate portions is taper, and the angle of taper work portion should be 30 °～110 °.
2, the method for utilizing plastic deforming chamfer to improve position, aperture fatigue strength according to claim 1, the mold pressing chamfering amount when it is characterized in that described calendering and/or roll extrusion chamfering, the promptly vertical chamfering degree of depth is 0.1～3mm.
3, the method for utilizing plastic deforming chamfer to improve position, aperture fatigue strength according to claim 1, it is characterized in that described when utilizing finger-type pressing mold chamfering, in the seamed edge application of force of last aperture, should reach needed chamfering amount along the steady mobile frock of aperture seamed edge direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100104570A CN101020945A (en) | 2007-02-14 | 2007-02-14 | Plastic deforming chamfer process to raise fatigue strength of hole and opening position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100104570A CN101020945A (en) | 2007-02-14 | 2007-02-14 | Plastic deforming chamfer process to raise fatigue strength of hole and opening position |
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| CN101020945A true CN101020945A (en) | 2007-08-22 |
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| CNA2007100104570A Pending CN101020945A (en) | 2007-02-14 | 2007-02-14 | Plastic deforming chamfer process to raise fatigue strength of hole and opening position |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108818626A (en) * | 2017-05-05 | 2018-11-16 | 皇家飞利浦有限公司 | cutting mechanism |
| CN109967580A (en) * | 2019-03-22 | 2019-07-05 | 哈尔滨工业大学 | A kind of bilayer synchronous friction Hubbing method in situ increasing hole wall thickness |
| 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 |
| CN112045367A (en) * | 2020-08-03 | 2020-12-08 | 东风商用车有限公司 | Metal plate sheared edge rolling strengthening method and plate-shaped part manufactured by same |
| CN114599483A (en) * | 2019-10-25 | 2022-06-07 | 赛峰直升机发动机公司 | Device for cold expansion of through-hole |
-
2007
- 2007-02-14 CN CNA2007100104570A patent/CN101020945A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108818626A (en) * | 2017-05-05 | 2018-11-16 | 皇家飞利浦有限公司 | cutting mechanism |
| CN109967580A (en) * | 2019-03-22 | 2019-07-05 | 哈尔滨工业大学 | A kind of bilayer synchronous friction Hubbing method in situ increasing hole wall thickness |
| CN109967580B (en) * | 2019-03-22 | 2020-05-12 | 哈尔滨工业大学 | Double-layer synchronous friction drawing method for increasing wall thickness of hole in situ |
| CN114599483A (en) * | 2019-10-25 | 2022-06-07 | 赛峰直升机发动机公司 | Device for cold expansion of through-hole |
| CN112045367A (en) * | 2020-08-03 | 2020-12-08 | 东风商用车有限公司 | Metal plate sheared edge rolling strengthening method and plate-shaped part manufactured by same |
| 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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