CN101513703B - Ultrahigh strength cold forging processing method for fastener using austenitic 300 series as material - Google Patents
Ultrahigh strength cold forging processing method for fastener using austenitic 300 series as material Download PDFInfo
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- CN101513703B CN101513703B CN2008100706546A CN200810070654A CN101513703B CN 101513703 B CN101513703 B CN 101513703B CN 2008100706546 A CN2008100706546 A CN 2008100706546A CN 200810070654 A CN200810070654 A CN 200810070654A CN 101513703 B CN101513703 B CN 101513703B
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Abstract
The invention relates to an ultrahigh strength cold forging processing method for fasteners using austenitic 300 series as a material. The method sequentially comprises the following steps of material preparation, head part molding, tail part molding and tooth line molding, wherein the material preparation step is utilized to obtain a blank provided with the austenitic 300 series, and the blank is operated by cold forging in advance so as to ensure that the outer diameter of the blank is reduced by more than 15 percent, and the blank forms a rod; and after molding, the outer diameter of the rod is equal to that of needed before processing, and at the time, the strength born by the rod is at least increased by more than 1/2 of the value of the original blank so as to ensure that the rod is processed through the subsequent head part molding step, the tail part molding step and the tooth line molding step. The cold forging processing method is completely utilized to manufacture in the molding process, and then the fastener which has the advantages of high strength, good rust prevention and low manufacturing cost can be quickly molded so as to achieve the effects of object drilling, use safety after lock drilling, and the like.
Description
Technical field
The present invention is relevant for a kind of manufacture method of fastener, and particularly a kind of austenite 300 series are the ultrahigh strength cold forging processing method for fastener of material.
Background technology
Consult Fig. 1 and Fig. 2, known austenite 300 series are the fastener manufacture method 1 of material, and it includes material preparation step 11, forming step 12, tooth line forming step 13 and heat treatment step 14; Wherein, in advance get everything ready in this material preparation step 11 stock 21 of an austenite 300 serial suitable lengths, promptly make the stainless steel of fastener materials such as 302,304 commonly used as the dealer, and be example with the stainless steel of φ 12 bars footpaths (being diameter 5.5mm), its the most maximum shear strength is 2630 pounds, and this stainless steel outside diameter d system directly takes through taking out the stock 21 that the line gained is directly taken out by line factory, and these stock 21 outside diameter d are the fastener 22 size outside diameter d that institute's desire is made; In addition, this forming step 12 is with aforementioned this stock 21 head 23 of moulding one big external diameter respectively, and one by these head 23 outward extending bodies of rod 24, and the end with these body of rod 24 opposite these heads 23 gives punching press and is formed with a brill lock section 25 simultaneously.
Still continuous aforementioned, this tooth line forming step 13 is the threading machine (not shown) of having got everything ready, and utilizes this threading eedle to being molded plural tooth line 26 on this body of rod 24, and then finishes a fastener 22 and tentatively make; At last, this heat treatment step 14 is the heat-treatment furnace (not shown) of having got everything ready, carry out Carburization Treatment to insert heat-treatment furnace at this fastener 22 of these tooth line forming step 13 gained, so that change this fastener 22 molecular structures, and make these fastener 22 surperficial shapes that one carbon-coating 27 be arranged, and then increase this fastener 22 intensity.
Only, though known manufacture process can mold the fastener of desirable strength for use, but on actual the use following disappearance is arranged, details are as follows now:
1, known fastener manufacturing, though this stock is in processes such as this forming step and tooth line forming step, because of the extruding moulding lift one's head portion, bore the fastener of lock section and tooth line, so that the intensity of this fastener is higher than former stock intensity, but this fastener intensity still is not enough to lock in object and establishes, thus need carry out a heat treatment step more in addition, to promote this fastener intensity, so will increase manufacturing step and manufacturing overhead cost, not meet economic benefit in fact.
2, still continuous aforementioned, this fastener via a heat treatment step after, though can effectively increase fastener hardness, but because of this fastener in the heat treatment step process, this fastener is vulnerable to temperatures involved and produces softening, and then the heart portion intensity when returning to this stock, unique only remaining this fastener surface is adhered to because of the formed carbon-coating of this heat treatment step, and only increase this fastener case hardness, phenomenons such as the hard and heart portion in promptly so-called this fastener surface is soft, relatively reduce the ductility of this fastener, cause actual brill lock process very easily to produce fracture, or can't bore to lock because of the soft influence of centre hardness and awkward situation such as enter, even inadequate sealed entering, also because of the not good characteristics of this fastener ductility, all can cause the harm of the security after sealed, have to watch out for.
Moreover, in addition because of the adhering to of this carbon-coating, cause this fastener use a period of time after still can produce corrosion, so must additionally increasing antirust treatment step, handles the fastener of known moulding, except that influencing speed of production, also can additionally increase manufacturing cost, remain in fact to be improved.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of austenite 300 series and be the ultrahigh strength cold forging processing method for fastener of material,, have quick, the low characteristics such as safer of using that reach of expense cost of producing simultaneously except that can significantly promoting fastener intensity, the rust-proof effect.
For reaching above-mentioned purpose, the present invention adopts following scheme: a kind of austenite 300 series are the ultrahigh strength cold forging processing method for fastener of material, and its step is in regular turn:
(1) material preparation step, its stock that preparation has an austenite 300 series of going ahead of the rest, and this stock is in advance through the cold forging operation, make this stock reduced diameter more than 15% and form a body of rod, and this body of rod external diameter after the moulding is equal to desires to add required external diameter in man-hour, and this moment, this body of rod bearing strength increased more than 1/2 of former stock numerical value;
(2) head forming step behind operations for forming, and forms the head of big external diameter with aforementioned this body of rod;
(3) afterbody forming step, its end with opposite this head of this body of rod gives stamping press and is formed with a brill lock section; And
(4) tooth line forming step carries out rolling at the head of this body of rod and the section that bores between the lock section, to mold plural tooth line, promptly finishes this fastener manufacturing.
Can carry out one again after this tooth line forming step is finished and whiten step, to recover the primary colors of austenite 300 series materials.
Can carry out an antirust treatment step again behind this tooth line forming step, coat this fastener periphery and form an antirust coat.
Adopt such scheme, austenite 300 series of the present invention are the ultrahigh strength cold forging processing method for fastener of material, be to utilize the get everything ready stock of an austenite 300 series of this material preparation step, and this stock is in advance through the cold forging operation, desire to add required body of rod external diameter in man-hour to mold to be equal to, this moment, this body of rod bearing strength increased more than 1/2 of former stock numerical value, in this manufacture process fully with the machine-shaping of cold forging mode, do not carry out any hot work that adds, so this fastener of moulding can not destroy the molecules align state of this material, has high-intensity characteristic; Carrying out follow-up cold-forge forming afterwards again is head forming step, afterbody forming step and tooth line forming step, go out high-intensity fastener with direct, rapid shaping, do not need additionally to go again to increase other treatment step (as the heat treatment step of known fastener manufacturing), therefore can effectively reduce manufacturing cost, this fastener has preferable ductility after simultaneously sealed, preventing the facts of sealed fracture, and can increase security after sealed.
Description of drawings
Fig. 1 is that known austenite 300 series are the fastener manufacture method flow chart of material;
Fig. 2 is that known austenite 300 series are the fastener forming process schematic diagram of material;
Fig. 3 is the flow charts of these austenite 300 series of the present invention for the ultrahigh strength cold forging processing method for fastener of material;
Fig. 4 is the forming process schematic diagrames of austenite 300 series of the present invention for the ultrahigh strength cold forging processing method for fastener of material;
Fig. 5 a is the tooth line case hardness test resolution of the moulding fastener of a preferred embodiment of the present invention;
Fig. 5 b is the brill lock section case hardness test resolution of the moulding fastener of a preferred embodiment of the present invention;
Fig. 6 is the flow charts of austenite 300 series of another preferred embodiment of the present invention for the ultrahigh strength cold forging processing method of material; And
Fig. 7 is the fastener schematic diagram of another preferred embodiment of the present invention.
The main element symbol description
3 austenites, 300 series are the ultrahigh strength cold forging processing method for fastener of material
31 material preparation steps, 41 stocks
32 head forming step, 42 bodies of rod
33 afterbody forming step, 43 heads
34 tooth line forming step 44 are bored the lock section
35 whiten step 45 tooth line
36 antirust treatment step 46 antirust coats
4 fastener d1, d2, d3 external diameter
The specific embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly understand.
Before the present invention is described in detail, be noted that in the following description similar elements is to represent with identical numbering.
Consult Fig. 3,4, austenite 300 series of the present invention are a preferred embodiment of the ultrahigh strength cold forging processing method for fastener 3 of material, and it comprises material preparation step 31, head forming step 32, afterbody forming step 33, tooth line forming step 34 etc. in regular turn; Wherein, the get everything ready stock 41 of an austenite 300 series of this material preparation step 31, promptly as the dealer make fastener commonly used 302, the stainless steel of 304 materials such as grade, and these stock 41 external diameters are d1, if 5.5 millimeters (mm) make the bar footpath with diameter, and this d1 external diameter is required to be more than 6.325 millimeters (mm) at least, this stock 41 is in advance through the cold forging operation simultaneously, so that this stock outside diameter d 1 is dwindled more than 15% and is formed a body of rod 42, and these body of rod 42 outside diameter d 2 after the moulding are equal to desires to add required external diameter in man-hour: 5.5 millimeters (mm), this moment, but these body of rod 42 bearing strengths increased more than 1/2 of former numerical value, that is one test condition such as shear strength that this body of rod 42 records be 4065.25 pounds, the shear strength that can bear much larger than the known stock for preparing.
Still continuous aforementioned, this head forming step 32 be with aforementioned this body of rod 42 after the cold-forge forming operation, an end of this body of rod 42 is formed with a head 43, and the outside diameter d 3 of this head 43 is the outside diameter d 2 greater than this body of rod 42; Again, this afterbody forming step 33 is that the end with aforementioned these body of rod 42 opposite these heads 43 gives forming one through the cold-forge forming operation and bores lock section 44 (brill tail as shown in Figure 4), push and be subjected to cold forging in these brill lock section 44 forming processes again, so the intensity of this brill lock section 44 can promote again, to bear follow-up brill lock (not shown) desirable strength demand; At last, these tooth line forming step 34 cordings have a threading machine (not showing among the figure), this threading eedle carries out the rolling operation to this body of rod 42, to mold plural tooth line 45, so finishing this fastener 4 makes, and aforementioned this fastener 4 has promoted outside the strength of materials from this material preparation step 31, cooperates follow-up this head forming step 32 of doing, afterbody forming step 33, tooth line forming step 34 etc. again, so that these fastener 4 case hardnesses, intensity strengthen more.
Particularly, aforementioned this fastener 4 has more appearance for making this fastener 4 after making and finishing, and whitens step 35 so can carry out one again after this tooth line forming step 34 is finished, to clean this fastener 4 process institute residue, the silvery white primary colors that mat recovers these austenite 300 series materials presents.
Moreover, this fastener in response to the manufacturing of aforementioned worker's method, more in response to using locational difference, promptly there is its difference to require quality, standard to produce, fastener that following spy is used at building industry and automobile dealer 4 is tested for example, and by every data of this test gained ought be able to understand these fastener 4 certain tool high strength of utilizing worker's method of the present invention manufacturing, effect such as rust-preventing characteristic is good and the security of use is good.
(1) at first, just to build the fastener that industry is done, and this test is promptly tested to desire making #12 * 8 samples such as 35 grades because this fastener to emphasize to be to bore the required hardness that possesses of lock process, torsion strength, shear strength and etc. numerical value, back gained after tested is as follows:
| Content measurement | Measured value | Remarks |
| Tooth line surface | 402～423HV0.3 | |
| Surface, brill lock section | 395～432HV0.3 | |
| Torsion strength | 124.15～124.28in.lb | Shown in ginseng Fig. 5 a, the 5b behind the conversion metric system: 143.08～143.20kg.cm |
| Shear strength | (4065.25Ib pound) |
| The loading test | 6045 pounds |
(2) in addition, the fastener of doing just with the automobile industry, and this test is promptly tested to desire making M8 * 1.25 * 32MM 8 samples such as (millimetres), because the sealed need of this fastener are paid special attention to this fastener intensity, so carry out tests such as centre hardness, heart portion tension intensity, percentage elongation in regular turn, and this test data tabular is as follows:
| Content measurement | Measured value | Standard value |
| Centre hardness | 37-38HRC | 33-39HRC |
| Heart portion tension intensity | 124-125kg/mm 2 | 110Min.kg/mm 2 |
| Percentage elongation | 12-14％ | 10MIN.％ |
At first, aforesaid standard value system uses according to automobile requiredly to be possessed intensity and decides, in view of being that material does not all have and reaches with austenite 300 series at present, so its standard value system is that the intensity of iron is ordered according to material, so fastener is via aforementioned test as can be known for it in worker's method of the present invention institute, on numerical value such as the heart portion tension intensity of this fastener gained and percentage elongation all were above standard, this centre hardness was also within specification, so this fastener meets the standard that applies on the automobile industry fully simultaneously.
(3) again, no matter be institutes such as automobile or building industry fasteners for it, also to consider the corrosion problem, and this test system carries out salt spray test with aforementioned each fastener, it is tested according to DIN 50018 standards, found that this fastener does not all have any corrosion phenomena, prove that more the fastener of worker method of the present invention manufacturing has preferable rust-proof effect.
Consult Fig. 6, Fig. 7, it is austenite 300 series of the present invention another preferred embodiments for the ultrahigh strength cold forging processing method for fastener 3 of material, this enforcement is still identical with last embodiment, it still has material preparation step 31, head forming step 32, afterbody forming step 33, tooth line forming step 34, particularly, present embodiment is can carry out an antirust treatment step 36 again behind this tooth line forming step 34, so that these fastener 4 peripheries are coated with an antirust coat 46, in order to do the rust-proof effect that increases this fastener 4, and this operating type is not certain necessity, the carrying out that has been accustomed to this antirust treatment step 36 after all on the market, so this way of present embodiment, also only for cooperating the market demand, relatively, the rust-proof effect of this fastener 4 is better.
By above-mentioned explanation, when learning that worker's method of the present invention has following effect really, is summarized as follows:
1, austenite 300 series of the present invention are the ultrahigh strength cold forging processing method for fastener of material, wherein, this stock is gone ahead of the rest through the cold forging squeeze job, except that forming this stock reduced diameter more than 15% and the high-intensity body of rod of tool, and this body of rod bearing strength increases more than 1/2 of former stock numerical value, simultaneously in this manufacture process fully with the machine-shaping of cold forging mode, do not carry out any hot work that adds fully, so this fastener of moulding can not destroy the molecules align state of this material, promptly have high-strength characteristic, be enough to bore to lock on the object use.
2, still continuous aforementioned, because in this fastener manufacture process, need be through known heat treatment step not reach the comentation hardening effect, except that can promoting effects such as speed of production and reduction expense cost greatly, and because of not having any heating and carburizing program, so no matter this fastener is in heart portion and surface strength etc., all can maintain and be fit to bore more than the required intensity of lock, even the rust-proof effect of this fastener also promotes because of no carbon-coating infiltrates significantly, can't bore the awkward situation that lock enters so can avoid the soft influence of centre hardness, and this fastener has preferable ductility after sealed, except that preventing the sealed fracture facts, and can increase effects such as security after sealed and rust-preventing characteristic.
In sum, austenite 300 series of the present invention are the ultrahigh strength cold forging processing method for fastener of material, it utilizes cold forging worker manufactured fully, that is utilize this stock in advance through the cold forging extruding, be all the high-intensity body of rod to mold heart portion and surface, and carry out follow-up head with this body of rod again, bore Cold Forging moulding such as lock section and tooth line, can finish high strength fast and be difficult for the fastener manufacturing of corrosion, exempt known unnecessary heat treatment process step in the manufacture process simultaneously, except that reducing expense cost, have effects such as safety in utilization after attacking object and bore lock at brill simultaneously.
The above person of thought, only be explanation preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to the present patent application claim and description of the invention content generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (3)
1. austenite 300 series are the ultrahigh strength cold forging processing method for fastener of material, and its step is in regular turn:
(1) material preparation step, its stock that preparation has an austenite 300 series of going ahead of the rest, and this stock is in advance through the cold forging operation, make this stock reduced diameter more than 15% and form a body of rod, and this body of rod external diameter after the moulding is equal to desires to add required external diameter in man-hour, and this moment, this body of rod bearing strength increased more than 1/2 of former stock numerical value;
(2) head forming step behind operations for forming, and forms the head of big external diameter with aforementioned this body of rod;
(3) afterbody forming step, its end with opposite this head of this body of rod gives stamping press and is formed with a brill lock section; And
(4) tooth line forming step carries out rolling at the head of this body of rod and the section that bores between the lock section, to mold plural tooth line, promptly finishes this fastener manufacturing.
2. austenite 300 series as claimed in claim 1 are the ultrahigh strength cold forging processing method for fastener of material, it is characterized in that: can carry out one again after this tooth line forming step is finished and whiten step, to recover the primary colors of austenite 300 series materials.
3. austenite 300 series as claimed in claim 1 are the ultrahigh strength cold forging processing method for fastener of material, it is characterized in that: can carry out an antirust treatment step again behind this tooth line forming step, coat this fastener periphery and form an antirust coat.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100706546A CN101513703B (en) | 2008-02-18 | 2008-02-18 | Ultrahigh strength cold forging processing method for fastener using austenitic 300 series as material |
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| CN2008100706546A CN101513703B (en) | 2008-02-18 | 2008-02-18 | Ultrahigh strength cold forging processing method for fastener using austenitic 300 series as material |
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| CN101513703A CN101513703A (en) | 2009-08-26 |
| CN101513703B true CN101513703B (en) | 2010-07-21 |
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| CN103894787A (en) * | 2012-12-28 | 2014-07-02 | 苏州工业园区协诚精密五金有限公司 | Manufacturing method for nut |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233880A (en) * | 1978-07-20 | 1980-11-18 | Illinois Tool Works Inc. | Stainless steel drill screw |
| US5186688A (en) * | 1991-07-26 | 1993-02-16 | Hargo 300-Technology, Inc. | Method of manufacturing austenitic stainless steel drill screws |
| CN1082477A (en) * | 1992-07-15 | 1994-02-23 | 柯耀庭 | The manufacture method of austenitic stainless steel self tapping and self-drilling screw |
| US6017274A (en) * | 1997-09-02 | 2000-01-25 | Automotive Racing Products, Inc. | Method of forming a fastener |
-
2008
- 2008-02-18 CN CN2008100706546A patent/CN101513703B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233880A (en) * | 1978-07-20 | 1980-11-18 | Illinois Tool Works Inc. | Stainless steel drill screw |
| US5186688A (en) * | 1991-07-26 | 1993-02-16 | Hargo 300-Technology, Inc. | Method of manufacturing austenitic stainless steel drill screws |
| CN1082477A (en) * | 1992-07-15 | 1994-02-23 | 柯耀庭 | The manufacture method of austenitic stainless steel self tapping and self-drilling screw |
| US6017274A (en) * | 1997-09-02 | 2000-01-25 | Automotive Racing Products, Inc. | Method of forming a fastener |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平8-309472A 1996.11.26 * |
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