CN115111236A - Hole extrusion method with bushing and fastener structure - Google Patents
Hole extrusion method with bushing and fastener structure Download PDFInfo
- Publication number
- CN115111236A CN115111236A CN202110290706.6A CN202110290706A CN115111236A CN 115111236 A CN115111236 A CN 115111236A CN 202110290706 A CN202110290706 A CN 202110290706A CN 115111236 A CN115111236 A CN 115111236A
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- CN
- China
- Prior art keywords
- hole
- bushing
- extrusion
- holes
- lined bore
- Prior art date
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- Pending
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005728 strengthening Methods 0.000 claims abstract description 21
- 230000005489 elastic deformation Effects 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 2
- 235000011089 carbon dioxide Nutrition 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 3
- 229910045601 alloy Inorganic materials 0.000 claims 3
- 239000011148 porous material Substances 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 238000000641 cold extrusion Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
- F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a hole extrusion strengthening method with a bush and a fastening structure. The method is characterized in that a bushing is used as an extrusion strengthening tool and is arranged in a base body hole, and a certain extrusion magnitude of interference is kept between the bushing and the hole, so that the bushing is contacted with the hole at the position of the hole to be strengthened, and the extrusion strengthening of the hole is realized. Further, with the bushing remaining in the base hole, a fastening connection structure, such as a bolt and a nut, is installed, resulting in a fastener structure with a bushing.
Description
Technical Field
The invention belongs to the technical field of fatigue strengthening, and particularly relates to a hole extrusion method with a bushing and a fastener structure.
Background
The fastening hole is a common connecting structure, and the fastening hole is a typical structure which is easy to generate local stress, cracks are easy to generate, the service life of the hole is influenced, and as shown in fig. 1, when a force is applied along the direction shown in the figure, a stress concentration area A is formed at the edge of the hole. To solve this problem, a common approach is to use a cold extrusion strengthening process. The principle of cold extrusion strengthening is that a core rod with a diameter slightly larger than the diameter of the hole to be strengthened is forced to pass through the hole, as shown in fig. 2, extrusion force acts on the inner wall of the hole through the core rod to enable the hole wall to generate plastic deformation, metal in an area far away from the vicinity of the hole wall rebounds to enable the vicinity of the hole wall to generate residual compressive stress, so that the average stress of the hole edge when loaded is reduced, and the service life of the hole is prolonged. However, after the hole extrusion, the hole is plastically deformed, and a bulge region B is easily generated on the extrusion surface of the mandrel bar, which affects the flatness of the extrusion surface and further affects the matching of the extrusion surface with other parts as shown in fig. 3.
In addition to cold extrusion strengthening, ultrasonic strengthening, laser shot peening process, and the like are also applied to hole strengthening. The invention patent of publication No. CN108754121A discloses a device and a method for combined extrusion strengthening of hole wall laser shot blasting, which proposes that a core rod with a front cone is inserted into the hole diameter of a workpiece to be processed, a laser beam emitted by a laser forms an annular laser band in the front cone after being reflected for multiple times, and the annular laser band carries out laser shot blasting strengthening on the hole wall area where the annular laser band is located. The invention patent of publication No. CN107012305A discloses a method and a device for ultrasonic extrusion strengthening of a structural member connecting hole, which proposes that an ultrasonic vibration core rod slowly passes through the connecting hole at a constant speed to perform ultrasonic extrusion strengthening on the hole under the condition that 2% -6% of extrusion allowance is kept between the core rod and the connecting hole, and the method still cannot avoid the problem of extrusion surface bulging caused by cold extrusion.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a hole extrusion method with a bushing and a fastener structure.
The invention relates to a hole extrusion strengthening method with a bush, which comprises the following steps:
the method comprises the following steps: according to the shape and the size of the hole, the shape and the size of the bushing are selected, and a certain extrusion interference is guaranteed;
step two: the bushing is arranged in the hole, so that the bushing is contacted with the hole at the position of the hole to be reinforced, and the extrusion reinforcement of the hole is realized;
step three: mounting a fastening connection structure under the condition that the bush is reserved in the hole;
preferably, the extrusion interference is 0.05-0.4mm, and the extrusion interference refers to the diameter interference between the outer ring of the bushing and the hole, for example, the diameter of the extruded part of the hole is 8mm, and correspondingly, the diameter of the extruded part of the bushing is 8.05-8.4 mm;
preferably, the holes are circular holes or profiled holes; preferably, the holes are profiled holes; more preferably, the holes are elliptical;
preferably, the bushing is a circular bushing or a profiled bushing in a free state; more preferably, the bushing is an elliptical bushing in a free state;
preferably, the hole is an elliptical hole and the bushing is a circular bushing in a free state; or the hole is a circular hole, and the bushing is an elliptical bushing in a free state;
the shapes of the hole in the base body and the bush are not limited to the above, as long as when the dimension of the bush in a certain direction is larger than the dimension of the hole in the base body in a certain direction, elastic deformation, i.e., compressive stress, can be formed by mutual pressing. For example, when the shape of the hole in the base is the same as that of the bushing, but the size of the hole is slightly smaller than that of the bushing, the bushing is installed in the hole in the base by cooling the bushing, and after the temperature is restored to room temperature, the residual compressive stress is generated in the hole in the base in the whole circumferential direction.
Preferably, the material of the bushing is steel or a superalloy, more preferably, the material of the bushing is a nickel-based superalloy;
the liner can be shrunk by means of dry ice or liquid nitrogen cooling and is installed in the hole; or the bush is pinched flat within the elastic deformation range and is installed in the hole;
the fastening connection structure may be a bolt.
The invention also provides a fastener structure with the bushing, which comprises a bolt, a nut and a plurality of substrates, wherein the substrates are provided with holes, the bolt penetrates through the holes and is connected with the nut, the bushing is arranged in the holes, and extrusion interference magnitude exists between the bushing and the holes, so that the hole walls of the holes can be extruded and reinforced.
The invention installs the bushing in the hole, and utilizes the shape and size difference between the bushing and the hole to lead the bushing to extrude and strengthen the stress concentration area on the hole. Because the mode of cold extrusion of the core rod is not adopted, the axial movement of the extrusion core rod is avoided, the deformation of the hole in the axial direction is avoided, and the flatness of the two end planes of the hole is not influenced, thereby ensuring the assembly effect.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of a hole in a stress direction and a stress concentration region
FIG. 2 is a schematic view of a cold extrusion hole of a core rod
FIG. 3 is a schematic view showing the hole state of the cold extruded core rod
FIG. 4 is a schematic view of a substrate with holes
FIG. 5 is a schematic view of the bushing in a free state
FIG. 6 is a schematic view of the bushing for extruding and strengthening the hole
FIG. 7 is a schematic view of a fastener with a bushing installed
In the figure, the substrates 1, 101, 102; 1-1 of a hole; bushings 2, 201, 202; a stress concentration region 3; a bolt 4; and a nut 5.
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments. The scope of protection of the invention is not limited to the following examples, which are set forth for illustrative purposes only and are not intended to limit the invention in any way.
Unless otherwise defined, all terms used herein have the meanings that are commonly understood by those skilled in the art.
Example 1
As shown in fig. 4 to 6, the present embodiment provides a method for extruding and reinforcing a hole with a bushing.
The base body 1 is provided with a hole 1-1 which is oval, the lining 2 is round in a free state and made of steel, and the radius of the lining 2 in the free state is slightly larger than the minor axis of the hole 1-1.
During assembly, the bushing 2 is pinched to be flat in the elastic deformation range through the pliers, the bushing 2 is installed in the hole 1-1, and after the pinching force is lost, the bushing 2 performs extrusion strengthening on the stress concentration area 3 of the hole 1-1, so that the stress concentration area 3 generates elastic deformation or elastic deformation and plastic deformation, residual compressive stress is formed, and the service life of the hole is prolonged.
Example 2
As shown in fig. 7, the present embodiment provides a fastener with a perforated extrusion reinforced bushing.
The fastener of this embodiment includes base member 101 and base member 102, and both are equipped with the hole on the base member, install bush 201 and 202 in the hole respectively, have extrusion magnitude of interference between bush and the hole, have extrusion strengthening effect to the hole, connect through the bolt 4 and the nut 5 cooperation at both ends, and is fixed base member 101 and base member 102.
It should be noted by those skilled in the art that the described embodiments of the present invention are merely exemplary and that various other substitutions, alterations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the above-described embodiments, but is only limited by the claims.
Claims (12)
1. The method for extruding and strengthening the hole with the bushing is characterized by comprising the following steps of:
the method comprises the following steps: according to the shape and the size of the hole, the shape and the size of the bushing are selected, and a certain extrusion interference is ensured;
step two: the bushing is arranged in the hole, so that the part of the bushing, which needs to be reinforced, is in contact with the hole, and the extrusion reinforcement of the hole is realized;
step three: the fastening connection is installed with the bushing retained in the hole.
2. The method of extrusion lining a lined bore according to claim 1, wherein: the extrusion interference is 0.05-0.4 mm.
3. The method of extrusion strengthening a lined bore of claim 1, wherein: the holes are circular holes or irregularly-shaped holes.
4. The method of extrusion lining a lined bore of claim 3, wherein: the special-shaped holes are oval holes.
5. The method of extrusion lining a lined bore according to claim 1, wherein: the bushing is a circular bushing or a special-shaped bushing in a free state.
6. The method of extrusion lining a lined bore of claim 5, wherein: the special-shaped bushing is an oval bushing.
7. The method of extrusion strengthening a lined bore of claim 1, wherein: the hole is an elliptical hole and the bushing is a circular bushing in a free state; or the holes are circular holes and the bushing is an elliptical bushing in a free state.
8. The method of extrusion strengthening a lined bore of claim 1, wherein: the material of the bushing is steel or high-temperature alloy.
9. The method of extrusion lining a lined bore of claim 8, wherein: the high-temperature alloy is nickel-based high-temperature alloy.
10. The method of extrusion lining a lined bore according to claim 1, wherein: the bushing contracts in a dry ice or liquid nitrogen cooling mode and is installed into the hole; or the bush is pinched flat within the elastic deformation range and fitted into the hole.
11. The method of extrusion lining a lined bore according to claim 1, wherein: the fastening connection structure is a bolt and a nut.
12. The utility model provides a take fastener structure of bush, includes bolt, nut, a plurality of base member, be equipped with the hole on the base member, the bolt passes the hole with the nut is connected, its characterized in that, install the bush in the hole, the bush with there is the extrusion magnitude of interference between the hole, can be right the pore wall in hole extrudees the reinforcement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290706.6A CN115111236A (en) | 2021-03-18 | 2021-03-18 | Hole extrusion method with bushing and fastener structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290706.6A CN115111236A (en) | 2021-03-18 | 2021-03-18 | Hole extrusion method with bushing and fastener structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115111236A true CN115111236A (en) | 2022-09-27 |
Family
ID=83324183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110290706.6A Pending CN115111236A (en) | 2021-03-18 | 2021-03-18 | Hole extrusion method with bushing and fastener structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115111236A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1548964A (en) * | 1975-04-09 | 1979-07-18 | Raychem Corp | Fastening devices |
| US4433567A (en) * | 1981-11-12 | 1984-02-28 | Grumman Aerospace Corporation | Method for working holes |
| US5265456A (en) * | 1992-06-29 | 1993-11-30 | Grumman Aerospace Corporation | Method of cold working holes using a shape memory alloy tool |
| US5822837A (en) * | 1996-06-17 | 1998-10-20 | Fichtel & Sachs Ag | Process for producing a frictional engagement |
| JP2009280864A (en) * | 2008-05-22 | 2009-12-03 | Univ Of Ryukyus | Method of prolonging fatigue life of excision part by partial plastic working |
| CN201627791U (en) * | 2009-12-22 | 2010-11-10 | 北京有色金属研究总院 | Expanded shape memory alloy ring for structurally strengthening plate with inner hole |
| CN104141517A (en) * | 2013-05-10 | 2014-11-12 | 马勒国际有限公司 | Camshaft |
-
2021
- 2021-03-18 CN CN202110290706.6A patent/CN115111236A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1548964A (en) * | 1975-04-09 | 1979-07-18 | Raychem Corp | Fastening devices |
| US4433567A (en) * | 1981-11-12 | 1984-02-28 | Grumman Aerospace Corporation | Method for working holes |
| US5265456A (en) * | 1992-06-29 | 1993-11-30 | Grumman Aerospace Corporation | Method of cold working holes using a shape memory alloy tool |
| US5822837A (en) * | 1996-06-17 | 1998-10-20 | Fichtel & Sachs Ag | Process for producing a frictional engagement |
| JP2009280864A (en) * | 2008-05-22 | 2009-12-03 | Univ Of Ryukyus | Method of prolonging fatigue life of excision part by partial plastic working |
| CN201627791U (en) * | 2009-12-22 | 2010-11-10 | 北京有色金属研究总院 | Expanded shape memory alloy ring for structurally strengthening plate with inner hole |
| CN104141517A (en) * | 2013-05-10 | 2014-11-12 | 马勒国际有限公司 | Camshaft |
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