CN1827291A - Tapping screw making method - Google Patents
Tapping screw making method Download PDFInfo
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- CN1827291A CN1827291A CN 200510051275 CN200510051275A CN1827291A CN 1827291 A CN1827291 A CN 1827291A CN 200510051275 CN200510051275 CN 200510051275 CN 200510051275 A CN200510051275 A CN 200510051275A CN 1827291 A CN1827291 A CN 1827291A
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Abstract
The invention relates to a method for preparing self-taping screw which can reduce the mold consumption, increase the mold service life, and reduce the producing cost, which comprises following steps: initial blank preparation, cap molding, tail molding, cutting part molding, and screw molding. Wherein, the cap molding step is that arranging the initial blank into the first molding mold to punch the cap to attain the first blank with cap; the tail molding step is that: arranging the first blank into the second molding mould and using the second molding mould to punch another end of first blank to form the second blank with tail; the cutting part molding step is that: arranging the tail of second blank into the third molding mould to punch the tail to form the third blank with cutting part; and the screw molding step is that: via the thread rolling of forth molding mould on the rod of third blank, forming the screw rod with screw thread and removing the burr of cutting part.
Description
Technical field
The invention belongs to fastener manufacturing method, particularly a kind of manufacture method of self-tapping screw.
Background technology
As shown in Figure 1 and Figure 2, the manufacture method of existing self-tapping screw 1 comprises the steps:
The moulding of cap portion at first will place first mould via the bar-shaped elementary stock of the metal that raw metal makes, and carry out 100 punching out of cap portion, to make first stock 10.
Cutting forming becomes first stock 10 to have via the second mould punching out second stock 11 of cutting portion 110.
Thread forming, with the rolled thread action of the bar portion 111 of second stock 11, roll over out screw thread 120 and make screw to roll, and remove the burr 112 of cutting portion 110 simultaneously via the 3rd mould, promptly can be made into screw, promptly have self-tapping screw 12 finished products of cutting portion 110 in tail end with self tapping function.
In cutting portion 110 forming steps metal wire rod can only select diameter greater than, be equal to or slightly less than the external diameter of cutting portion 110, otherwise will cause die face directly to be clashed into, when first stock 10 is inserted the die cavity 130 of second mould 13, fail fully and in time outwards to extend because of material when causing moulding too greatly because of bar footpath difference, cause two symmetrical modules of second mould 13 that the problem of collision mutually takes place when punch forming cutting portion 110, cause the bigger consume of mould.And 11 moulding of second stock are with the direct punch forming of second mould, and in the process of punch forming, cutting portion 110 needs the blade of forming and cutting simultaneously 1100, cutting alar part 1101, point 1102 and foot piece portion 1103 at least, and has burr 1104.So, when second stock 11 during in 13 moulding of second mould, cutting portion 110 each position once all in second mould 13 by punch forming, at this moment, the die cavity 130 that is positioned at second mould 13 will be cut each position of portion 110 and once push and be crowded with, cause second mould 13 must bear great moulding squeeze pressure, and this moulding squeeze pressure will cause the quick consume of second mould 13, the service life of mould is short, and the manufacturing cost of self-tapping screw increases with regard to absoluteness ground.
And for example ' the overlength sword self-tapping screw cutting edge section production method ' of No. the 544356th, notification number is intercepting material earlier; Again material one termination is dashed and establish the worker and form the cap head; With two corresponding punch dies the other end of material is dashed to establish again and be processed to form the overlength sword and attack tail; The turning of shaft screw thread processing in the middle of carrying out again; Utilize the mode of turning or grinding to carry out the secondary operations of self tapping tail cutting edge again, make the cutting edge of formation meet overlength sword self tapping tail.
Existing manufacture method is dashed to establish to the other end of material with the punch die of two correspondences and is processed to form overlength sword self tapping tail when second step.This kind forming method with the problem excessive to the in-molded squeeze pressure of punch die equally all can take place as the prior art of Fig. 1, Fig. 2, cause the shortcoming of the quick infringement of mould.
Summary of the invention
The purpose of this invention is to provide a kind of manufacture method that reduces mould loss, raising die life, reduces the self-tapping screw of self-tapping screw manufacturing cost.
The present invention comprises and makes elementary stock, the moulding of cap portion, afterbody moulding, cutting portion moulding and thread forming step; Cap portion forming step is for to place first mould to carry out the punching out of cap portion elementary stock, to make first stock with cap portion; The afterbody forming step utilizes second mould other end punching out of first stock to be had second stock of afterbody with formation for first stock is inserted in second mould; The cutting portion forming step is that the second stock afterbody is inserted the 3rd mould becomes to have cutting portion to the afterbody punching out of second stock the 3rd stock; The thread forming step is with the rolled thread action via the 4th mould of the bar portion of the 3rd stock, making the screw rod with complete screw thread, and removes the burr of cutting portion simultaneously.
Wherein:
The afterbody forming step is for becoming to have the afterbody of width greater than bar portion diameter with the second stock punching out.
The afterbody forming step is for becoming to have the flat afterbody of width greater than bar portion diameter with the second stock punching out.
The diameter of the metal wire rod of elementary stock is slightly smaller than or equals the external diameter of cutting portion.
The second stock afterbody punching out is become to have the sword of forming and cutting simultaneously, cutting alar part, point, foot piece portion and burr in the cutting portion forming step of the 3rd stock of cutting portion.
Also comprise the necking down forming step between cap portion forming step and the afterbody forming step.
The necking down forming step is to form annular groove in the first stock near caudal end part.
The necking down forming step is the end formation reducing diameter part in first stock.
Because the present invention comprises and makes elementary stock, the moulding of cap portion, afterbody moulding, cutting portion moulding and thread forming step; Cap portion forming step is for to place first mould to carry out the punching out of cap portion elementary stock, to make first stock with cap portion; The afterbody forming step utilizes second mould other end punching out of first stock to be had second stock of afterbody with formation for first stock is inserted in second mould; The cutting portion forming step is that the second stock afterbody is inserted the 3rd mould becomes to have cutting portion to the afterbody punching out of second stock the 3rd stock; The thread forming step is with the rolled thread action via the 4th mould of the bar portion of the 3rd stock, making the screw rod with complete screw thread, and removes the burr of cutting portion simultaneously.The punch forming afterbody of second stock in the afterbody forming step, the briquetting pressure when making with the second mould moulding is minimum, can not produce big molding pressure, and relative, die life is long, is difficult for consume; By the punch forming afterbody not only when selecting metal wire rod, can select diameter to be slightly smaller than or to equal the external diameter of cutting portion, and work as second stock and insert in the die cavity of the 3rd mould can not deviate from, more can not cause two symmetrical modules of the 3rd mould that the problem of collision mutually takes place when the punch forming cutting portion, more can reduce the consume of mould, improve die life, and and then reduce the manufacturing cost of self-tapping screw.Not only reduce the mould loss, improve die life, and reduce the self-tapping screw manufacturing cost, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, be existing self-tapping screw manufacture method schematic diagram.
Fig. 2, be the mould schematic diagram of existing self-tapping screw manufacture method.
Fig. 3, for schematic diagram of the present invention.
Fig. 4, for first kind of second mould schematic diagram of the present invention.
Fig. 5, for second kind of second mould schematic diagram of the present invention.
Fig. 6, for the third second mould schematic diagram of the present invention.
Fig. 7, be schematic diagram of the present invention (comprising the necking down forming step that forms the necking down annular groove).
Fig. 8, for schematic diagram of the present invention (comprising the necking down forming step that forms necking part).
The specific embodiment
As shown in Figure 3, Figure 4, the present invention includes following steps:
Make elementary stock: at first raw metal is intercepted according to Len req, to make the bar-shaped elementary stock of metal.
Cap portion moulding: elementary stock is placed first mould, utilize first mould that elementary stock is carried out 20 punching out of cap portion, promptly can be made into first stock 2 with cap portion 20.
Afterbody moulding: as Fig. 4, Fig. 5, shown in Figure 6, first stock 2 is inserted among the second mould 3A, the die cavity 3A0 that utilizes the second mould 3A has the afterbody 30 of width greater than bar portion 31 diameters to the other end punching out of first stock 2 with formation, as second stock 3 of flat afterbody 30, and the width that makes flat afterbody 30 is greater than bar portion 31 diameters.3 punch forming afterbodys 30 of second stock in the afterbody forming step, and because of the width of afterbody 30 near the width of die cavity 3A0, when making with the second mould 3A moulding, material can not lodge in the die cavity 3A0, thereby can fully be extended to the outer space of die cavity 3A0, so the briquetting pressure of the second mould 3A is minimum, can not produce big molding pressure, relative, die life is long, is difficult for consume.Moreover the afterbody forming step is to be made for flat afterbody 30, but is not that be limited to can only the flat afterbody of moulding, and it comprises the afterbody 30 of all width of moulding greater than bar portion 31 diameters.
The cutting portion moulding:
With second stock 3 be afterbody 30, insert the die cavity 4A 0 of the 3rd mould 4A as the afterbody 30 of flat, and afterbody 30 punching out of second stock 3 become to have the 3rd stock 4 of cutting portion 40.In the cutting portion forming step since second stock 3 punching out become width to be the afterbody 30 of flat greater than bar portion 31 diameters, when selecting metal wire rod, can select diameter to be slightly smaller than or to equal the external diameter of cutting portion 40, in inserting the die cavity 4A0 of the 3rd mould 4A, also can not deviate from second stock 3, more can not cause two symmetrical modules of the 3rd mould 4A that the problem of collision mutually takes place when punch forming cutting portion 40, more can reduce the consume of mould.The cutting portion forming step is afterbody 30 punch formings with second stock 3, so that cutting portion 40 forming and cutting simultaneously swords 400, cutting alar part 401, point 402 and foot piece portion 403, and remain a little burr 404.Therefore, moulding has the less effect of squeeze pressure to the die cavity 4A0 of the 3rd mould 4A for cutting portion.
Thread forming:
With the rolled thread action of the bar portion 41 of the 3rd stock 4 via the 4th mould, making screw rod, and remove the burr 404 of cutting portion 40 simultaneously with complete screw thread 50, promptly can be made into self-tapping screw.
So, utilize the gradation processing of second stock 3, the 3rd stock 4, have and reduce by second mould, the 3rd mould cavity pressure when each corresponding step punch forming, reduce the consume of second and third mould, relative, the quality that prolongs the service life of mould, the manufacturing cost that reduces self-tapping screw and raising self-tapping screw.
As Fig. 7, shown in Figure 8, between cap portion forming step and afterbody forming step, also comprise the necking down forming step.As shown in Figure 7, the necking down forming step is to form annular groove 6 in the first stock near caudal end part, is provided with the self-tapping screw of necking down annular groove 6 with formation.Or as shown in Figure 8, between cap portion forming step and afterbody forming step, also comprise the necking down forming step, the necking down forming step is the end formation reducing diameter part 6A in first stock, and molds part protuberance 30A in the afterbody forming step, is provided with the self-tapping screw of necking part 6A with formation.
The present invention has following characteristics:
1, the present invention is washed into first stock to have second stock of width greater than the afterbody of bar portion diameter with second mould; Again second stock is become to have the 3rd stock of cutting portion via the 3rd mould punching out.
2, the present invention is formed by second mould and the 3rd mould punching out successively respectively in second stock and the 3rd stock, have and reduce by second mould and the 3rd mould cavity pressure when each corresponding step punch forming, to reduce the mould loss, improve die life, and and then reduce the manufacturing cost of self-tapping screw.
Claims (8)
1, a kind of manufacture method of self-tapping screw, it comprises and makes elementary stock, the moulding of cap portion, cutting portion moulding and thread forming step; Cap portion forming step is for to place first mould to carry out the punching out of cap portion elementary stock, to make first stock with cap portion; It is characterized in that also comprising the afterbody forming step between described cap portion's forming step and the cutting portion forming step; The afterbody forming step utilizes second mould other end punching out of first stock to be had second stock of afterbody with formation for first stock is inserted in second mould; The cutting portion forming step is that the second stock afterbody is inserted the 3rd mould becomes to have cutting portion to the afterbody punching out of second stock the 3rd stock; The thread forming step is with the rolled thread action via the 4th mould of the bar portion of the 3rd stock, making the screw rod with complete screw thread, and removes the burr of cutting portion simultaneously.
2, the manufacture method of self-tapping screw according to claim 1 is characterized in that described afterbody forming step is for becoming to have the afterbody of width greater than bar portion diameter with the second stock punching out.
3, the manufacture method of self-tapping screw according to claim 1 is characterized in that described afterbody forming step is for becoming to have the flat afterbody of width greater than bar portion diameter with the second stock punching out.
4, the manufacture method of self-tapping screw according to claim 1 is characterized in that the diameter of the metal wire rod of described elementary stock is slightly smaller than or equals the external diameter of cutting portion.
5, the manufacture method of self-tapping screw according to claim 1 is characterized in that the sword of forming and cutting simultaneously, cutting alar part, point, foot piece portion and burr in the cutting portion forming step of described the 3rd stock that the second stock afterbody punching out is become to have cutting portion.
6, the manufacture method of self-tapping screw according to claim 1 is characterized in that describedly also comprising the necking down forming step between cap portion forming step and afterbody forming step.
7, the manufacture method of self-tapping screw according to claim 6 is characterized in that described necking down forming step is for forming annular groove in the first stock near caudal end part.
8, the manufacture method of self-tapping screw according to claim 6 is characterized in that described necking down forming step forms reducing diameter part for the end in first stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510051275 CN1827291A (en) | 2005-03-03 | 2005-03-03 | Tapping screw making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510051275 CN1827291A (en) | 2005-03-03 | 2005-03-03 | Tapping screw making method |
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| Publication Number | Publication Date |
|---|---|
| CN1827291A true CN1827291A (en) | 2006-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510051275 Pending CN1827291A (en) | 2005-03-03 | 2005-03-03 | Tapping screw making method |
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| CN (1) | CN1827291A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598164B (en) * | 2008-06-03 | 2011-07-06 | 陈河田 | Screw applied to composite material |
| CN102179682A (en) * | 2011-04-13 | 2011-09-14 | 江苏中科宇泰光能科技有限公司 | Manufacturing process for self-tapping section bar by using screw |
| CN102862025A (en) * | 2012-09-14 | 2013-01-09 | 庆达科技股份有限公司 | Screw manufacturing method |
| CN106736309A (en) * | 2017-02-23 | 2017-05-31 | 河北顶创金属制品有限公司 | A kind of screw processing technology |
| CN111730286A (en) * | 2020-06-29 | 2020-10-02 | 惠州市金箭精密部件有限公司 | Hardware processing method |
-
2005
- 2005-03-03 CN CN 200510051275 patent/CN1827291A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598164B (en) * | 2008-06-03 | 2011-07-06 | 陈河田 | Screw applied to composite material |
| CN102179682A (en) * | 2011-04-13 | 2011-09-14 | 江苏中科宇泰光能科技有限公司 | Manufacturing process for self-tapping section bar by using screw |
| CN102862025A (en) * | 2012-09-14 | 2013-01-09 | 庆达科技股份有限公司 | Screw manufacturing method |
| CN102862025B (en) * | 2012-09-14 | 2016-01-20 | 庆达科技股份有限公司 | Screw manufacture method |
| CN106736309A (en) * | 2017-02-23 | 2017-05-31 | 河北顶创金属制品有限公司 | A kind of screw processing technology |
| CN111730286A (en) * | 2020-06-29 | 2020-10-02 | 惠州市金箭精密部件有限公司 | Hardware processing method |
| CN111730286B (en) * | 2020-06-29 | 2022-06-24 | 惠州市金箭精密部件有限公司 | Hardware processing method |
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