CN103836049B - A kind of composite material screw and preparation method thereof - Google Patents
A kind of composite material screw and preparation method thereof Download PDFInfo
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- CN103836049B CN103836049B CN201410116104.9A CN201410116104A CN103836049B CN 103836049 B CN103836049 B CN 103836049B CN 201410116104 A CN201410116104 A CN 201410116104A CN 103836049 B CN103836049 B CN 103836049B
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Abstract
The invention provides a kind of composite material screw and preparation method thereof, adopt long fibre as the enhancing base of screw core, long fibre is along screw core axial distribution, and while cold-extruded helical thread portion, thin short-fibre silk is colded pressing into the top layer of composite material screw, thus while guarantee screw core strength, improve the intensity of helical thread portion, axial strength and the shear strength of screw are high, and the tensile strength of screw is promoted to more than 200MPa, anti-shear performance is very excellent.The top layer of thin short-fibre silk synchronous press-in composite bar in composite bar cold extrusion forming process, the helical thread portion of cold extrusion forming and screw core is one-body molded, precision is higher, thus dealt carefully with the contradiction between intensity targets and manufacturability.
Description
Technical field
The invention relates to the preparation method of composite material screw, particularly relates to the preparation method of fibre-reinforced composite material screw.
Background technique
Composite material screw is because its quality is light, specific strength is high, without magnetic, excellent corrosion resistance, structure is simple, assembling conformability is strong, be applicable to very much the connection at the composite structure non-bearing positions, field such as Aero-Space and needs require parts in high electronic structure connection without magnetic, corrosion resistance, obtain scientific and technological power and competitively develop and apply.Composite material screw is different from conventional injection moulding screw, overcome the shortcomings such as common injection moulding screw precision is low, bad mechanical property, but because of composite material screw processed complex, forming accuracy not easily ensures, limits the application of composite material fastening piece in aircaft configuration.For meeting the demand of aerospace industry to 200MPa level and above strength bolts, promoting the mechanical property of composite material screw, needing to carry out activeness and quietness to each position of screw in several ways.Carbon fibers/fiberglass, because its intensity is high, good rigidly, corrosion resistance are good, resistance to heat is good, becomes the enhancing base of many composite structures.But the enhancing base only selecting long fibre to be used as composite material screw resin matrix carrys out the mechanical property of improving product, thread forming can become extremely difficult, and its precision is difficult to ensure.
Chinese patent CN102701772A discloses a kind of preparation method of carbon fibre reinforced silicon carbide composite material screw, and its technological scheme adopted is: first pretreatment carbon fiber preform; Then prepare screw blank part, machining screw when selecting C/SiC blank flat relative density to be 50 ~ 80%, obtains screw blank part; Adopt screw thread modified solution to flood screw blank part again, solidify and be cross-linked, utilize diamond wheel to carry out screw thread process, obtain semi-finished product screw; Finally to the further densification of semi-finished product screw and anti-oxidant treatment, obtain finished product C/SiC composite material screw.The preparation method of the composite material screw that this patent application provides adopts blank surface impregnation, solidification and crosslinked mode, form modified coating, to gain in strength, but, this patent only selects long fibre to be used as the enhancing base of matrices of composite material, and do not mate due to thermal expansion coefficient between matrices of composite material and modified coating, modified coating and the associativity of matrices of composite material of preparation are poor, easily come off in rapid heat cycle process, the effect strengthening helical thread portion intensity cannot be realized, helical thread portion can be caused impaired in extrusion stretching process.
Therefore, under adopting long fibre to strengthen the prerequisite of base as screw core, screw surface need be improved, especially the intensity of helical thread portion simultaneously, thus while ensure that screw rod portion intensity, make helical thread portion intensity be unlikely to too low.
Summary of the invention
The problem that the invention will solve is ensureing screw rod portion intensity while, improve the intensity of helical thread portion, and ensure that helical thread portion shaping is easier to, precision is higher, thus dealt carefully with the contradiction between intensity targets and manufacturability, for solving this technical problem, the invention provides a kind of composite material screw and preparation method thereof.
The technological scheme that the invention adopts is: a kind of composite material screw, comprise the screw core of long fiber reinforcement, the thin helical thread portion of short-fibre silk enhancing and the screw head of upsetting system, described long fibre is along screw core axial distribution, described thin short-fibre silk is evenly distributed on the top layer of helical thread portion, and described screw head is formed by the top upsetting system of described screw core.
This screw medium-length fibre, along screw core axial distribution, and within being comparatively evenly distributed in screw thread central diameter size, thus promotes axial strength and the shear strength of screw.Strengthen intensity and the surface strength of helical thread portion simultaneously by adding thin short-fibre silk on screw top layer, thus the tensile strength of screw is promoted to more than 200MPa, anti-shear performance is very excellent.
Wherein, the length of described thin short-fibre silk is 0.01mm ~ 0.1mm, and its diameter is 0.001mm ~ 0.005mm.
Wherein, described thin short-fibre silk is distributed in composite bar top layer inwards within the scope of 0.5mm.
Wherein, described screw head is countersunk head, cup head, hexagon head, flat round end, hexagon socket head or gear grooved head dummy.
The invention additionally provides a kind of preparation method of composite material screw, comprises the following steps:
S1. the composite bar of long fiber reinforcement is prepared: the composite bar being prepared the long fiber reinforcement of required diameter by composite material knitting machine, then described bar is carried out surface preparation and lubrication, and fast described bar is pushed in thread forming template, make threaded composite bar by cold extrusion forming.
S2. the thin short-fibre silk of bar Surface mulch: in the cold extrusion forming process of S1, thin short-fibre silk is synchronously filled with in the ingress of thread forming template, at described bar in moving process in thread forming template, thin short-fibre silk is evenly brought in thread forming template chamber, and cold pressing on the top layer of described bar, form the screw core of long fiber reinforcement and the helical thread portion of thin short-fibre silk enhancing;
S3. cut: by cutting machine or with the lathe of custom-made clamping tooling, numerically controlled lathe or machining center, the threaded composite bar of cold extrusion forming is cut into Len req;
S4. upsetting screw-making head: make type screw head by the upsetting on punch press or hydraulic press of the counterdie with matching thread.
Wherein, in S1, the preprocess method of Surface of Rod Bar is the HCl solution that adopts concentration to be 4 ~ 5% and NaOH solution bar described in alternate immersion 2 ~ 4 hours successively, and between acid-base solution replaces, use bar described in a large amount of clear water or high-purity deionized water drip washing to drenching water outlet close to neutral, repetition like this 2 ~ 3 times, the consumption of each acid-base solution is 2 times of described bar volume, the HCl solution of last process application 4 ~ 5% carries out, then acidic solution is drained, can be stand-by to neutrality with clear water drip washing.
From S1 and S2, first this preparation method prepares the composite bar of long fiber reinforcement, then bar is carried out surface preparation and lubrication, and fast bar is passed through cold extrusion forming machine, in machine for extrusion molding pressure-ram effect under, by the screw thread inner chamber of extrusion die, form accurate thread bar.The precision of screw thread is ensured by the content of extrusion die and thin short-fibre silk and state, and the tensile strength of composite bar can be determined by the size of the length and thin short-fibre silk that adjust thin short-fibre silk.The screw thread bar integral surface quality that the method obtains is good, and the distribution of thin short-fibre silk easily controls.
Wherein, in S2, the length of thin short-fibre silk is 0.01mm ~ 0.1mm, and its diameter is 0.001mm ~ 0.005mm.
Wherein, in S2, thin short-fibre silk is distributed in composite bar top layer inwards within the scope of 0.5mm.
Can be obtained the screw of random lengths by S3, and this step ensure that screw thread in cutting process from damaging or damaging.
Wherein, the upsetting method in S4 refers to: the plasticity utilizing metal, the forging forming method of the top overstriking of bar or wire rod.Screw head can be made the head dummy arbitrarily such as countersunk head, cup head, hexagon head, flat round end, hexagon socket head or gear grooved head dummy by upsetting system.
Further, h13 and following composite material screw are only required to head height dimension, can by pincers worker remove in forming process screw surface formed burr, complete the processing of this composite material screw.And to head height dimension be the composite material screw of h12 and above required precision, after removing by pincers worker the burr formed in forming process, after also needing to adopt special clamping, screw head is processed, ensure size, complete the processing of this composite material screw.
Further, mentioned in the invention thin short-fibre silk is the cellosilk of carbon fiber wire, glass fiber or the two mixing.
The advantage that the invention has and good effect are: adopt long fibre as the enhancing base of screw core, and add thin short-fibre silk at helical thread portion, while guarantee screw rod portion intensity, improve the intensity of helical thread portion, the top layer of thin short-fibre silk synchronous press-in composite bar in composite bar cold extrusion forming process, the helical thread portion of cold extrusion forming and screw core is one-body molded, precision is higher, thus dealt carefully with the contradiction between intensity targets and manufacturability.
Accompanying drawing explanation
Fig. 1 is the overview flow chart of preparation method in the invention
Fig. 2 is the structural representation of the composite material screw adopting the preparation method of the invention to obtain
Embodiment
Elaborate below in conjunction with the specific embodiment of accompanying drawing to the invention.
As shown in the figure, the invention provides a kind of composite material screw, comprise screw core 3, the thin helical thread portion 4 of short-fibre silk 2 enhancing and the screw head 5 of upsetting system that long fibre 1 strengthens, described long fibre 1 is along screw core 3 axial distribution, described thin short-fibre silk 2 is evenly distributed on the top layer of helical thread portion 4, and described screw head 5 is formed by the top upsetting system of described screw core 3.
A preparation method for composite material screw, comprises the following steps:
S1. the composite bar of long fiber reinforcement is prepared: the composite bar being prepared the long fiber reinforcement of required diameter by composite material knitting machine; then described bar is carried out surface preparation and lubrication; and fast described bar is pushed in thread forming template, make threaded composite bar by cold extrusion forming;
S2. the thin short-fibre silk of bar Surface mulch: in the cold extrusion forming process of S1, thin short-fibre silk is synchronously filled with in the ingress of thread forming template, at described bar in moving process in thread forming template, thin short-fibre silk is evenly brought in thread forming template chamber, and cold pressing on the top layer of described bar, form the screw core of long fiber reinforcement and the helical thread portion of thin short-fibre silk enhancing;
S3. cut: by cutting machine or with the lathe of custom-made clamping tooling, numerically controlled lathe or machining center, the threaded composite bar of cold extrusion forming is cut into Len req;
S4. upsetting screw-making head: make type screw head by the upsetting on punch press or hydraulic press of the counterdie with matching thread.
Wherein, in S1, the preprocess method of Surface of Rod Bar is the HCl solution that adopts concentration to be 4 ~ 5% and NaOH solution bar described in alternate immersion 2 ~ 4 hours successively, and between acid-base solution replaces, use bar described in a large amount of clear water or high-purity deionized water drip washing to drenching water outlet close to neutral, repetition like this 2 ~ 3 times, the consumption of each acid-base solution is 2 times of described bar volume, the HCl solution of last process application 4 ~ 5% carries out, then acidic solution is drained, can be stand-by to neutrality with clear water drip washing.
In S1, long fibre along screw core axial distribution, thus promotes axial strength and the shear strength of screw.Strengthen intensity and the surface strength of helical thread portion simultaneously in S2 by adding thin short-fibre silk on screw top layer, thus the tensile strength of screw is promoted to more than 200MPa, anti-shear performance is very excellent.The cut to lengthen of the thin short-fibre silk in S2 is within the scope of 0.01mm ~ 0.1mm, and its diameter control is within the scope of 0.001mm ~ 0.005mm.
In S2, by the mode of colding pressing by within the scope of described thin short-fibre silk press-in composite bar top layer inwards 0.5mm, the precision of the helical thread portion of cold extrusion forming can reach 6h and more than, surface property is excellent.
Can be obtained the screw of random lengths by S3, and this step ensure that screw thread in cutting process from damaging or damaging.
Process the composite bar of screw thread, through S4, described screw head upsetting is made as the head dummy arbitrarily such as countersunk head, cup head, hexagon head, flat round end, hexagon socket head or gear grooved head dummy.
Further, h13 and following composite material screw are only required to head height dimension, can by pincers worker remove in forming process screw surface formed burr, complete the processing of this composite material screw.And to head height dimension be the composite material screw of h12 and above required precision, after removing by pincers worker the burr formed in forming process, after also needing to adopt special clamping, screw head is processed, ensure size, complete the processing of this composite material screw
Above the embodiment of the invention has been described in detail, but described content being only the preferred embodiment of the invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the invention scope change and improve, and all should still belong within this patent covering scope.
Claims (12)
1. a composite material screw, it is characterized in that: the screw head (5) comprising screw core (3) that long fibre (1) strengthens, helical thread portion (4) that thin short-fibre silk (2) strengthens and upsetting system, described long fibre (1) is along screw core axial distribution, described thin short-fibre silk (2) is evenly distributed on the top layer of helical thread portion (4), and described screw head (5) is formed by the top upsetting system of described screw core (3);
The length of described thin short-fibre silk (2) is 0.01mm ~ 0.1mm, and its diameter is 0.001mm ~ 0.005mm.
2. composite material screw according to claim 1, is characterized in that: described thin short-fibre silk be carbon fiber wire, glass fiber or the two mixing cellosilk.
3. composite material screw according to claim 1, is characterized in that: the top layer that described thin short-fibre silk (2) is distributed in helical thread portion is inwards within the scope of 0.5mm.
4. composite material screw according to claim 1, is characterized in that: described screw head (5) is countersunk head, cup head, hexagon head, flat round end or gear grooved head dummy.
5. composite material screw according to claim 1, is characterized in that: described screw head (5) is hexagon socket head type.
6. a preparation method for composite material screw as claimed in claim 1, is characterized in that comprising
Following steps:
S1. the composite bar of long fiber reinforcement is prepared: the composite bar being prepared the long fiber reinforcement of required diameter by composite material knitting machine, then described composite bar is carried out surface preparation and lubrication, and fast described composite bar is pushed in thread forming template, make threaded composite bar by cold extrusion forming;
S2. the thin short-fibre silk of bar Surface mulch: in the cold extrusion forming process of S1, thin short-fibre silk is synchronously filled with in the ingress of thread forming template, at described composite bar in moving process in thread forming template, thin short-fibre silk is evenly brought in thread forming template chamber, and cold pressing on the top layer of described composite bar, form the screw core of long fiber reinforcement and the helical thread portion of thin short-fibre silk enhancing;
S3. cut: by cutting machine or with the lathe of custom-made clamping tooling, numerically controlled lathe or machining center, the threaded composite bar of cold extrusion forming is cut into Len req;
S4. upsetting screw-making head: make type screw head by the upsetting on punch press or hydraulic press of the counterdie with matching thread.
7. the preparation method of composite material screw according to claim 6, is characterized in that: in S2, the length of thin short-fibre silk is 0.01mm ~ 0.1mm, and its diameter is 0.001mm ~ 0.005mm.
8. the preparation method of composite material screw according to claim 6, is characterized in that: in S2, thin short-fibre silk is distributed in composite bar top layer inwards within the scope of 0.5mm.
9. the preparation method of composite material screw according to claim 6, is characterized in that: in S4, screw head makes countersunk head, cup head, hexagon head, flat round end or gear grooved head dummy.
10. the preparation method of composite material screw according to claim 6, is characterized in that: in S4, screw head makes hexagon socket head type.
The preparation method of 11. composite material screws according to claim 6, is characterized in that: removed in forming process at the burr that screw surface is formed by pincers worker.
The preparation method of 12. composite material screws according to claim 6, is characterized in that: described thin short-fibre silk be carbon fiber wire, glass fiber or the two mixing cellosilk.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410116104.9A CN103836049B (en) | 2014-03-26 | 2014-03-26 | A kind of composite material screw and preparation method thereof |
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| CN201410116104.9A CN103836049B (en) | 2014-03-26 | 2014-03-26 | A kind of composite material screw and preparation method thereof |
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| CN103836049B true CN103836049B (en) | 2015-10-14 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3640208A1 (en) * | 1986-11-25 | 1987-04-30 | Eberhard Prof Dipl Ing Seidel | Threaded nut consisting of fibrous composite material, and process for the production thereof |
| US4909690A (en) * | 1987-12-16 | 1990-03-20 | Textron Inc. | Composite fastener |
| DE19625426A1 (en) * | 1996-06-25 | 1998-01-08 | Ferriere Belloli & Co | High strength composite connector, connector use |
| CN102775176B (en) * | 2012-07-18 | 2013-12-18 | 西安鑫垚陶瓷复合材料有限公司 | Preparation method of three-dimensional needling carbon/carborundum composite material bolt |
| CN203081983U (en) * | 2012-12-20 | 2013-07-24 | 湖南金博复合材料科技有限公司 | Composite fastener |
| CN103102179B (en) * | 2013-01-06 | 2014-04-02 | 西北工业大学 | Method for preventing carbon/carbon-base or ceramic-base composite fastener from loosening |
| CN103557221A (en) * | 2013-10-11 | 2014-02-05 | 航天特种材料及工艺技术研究所 | Online connection preparation method for C/SiC materials |
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