CN101169149A - Welding self-tapping screw and its machine-shaping method - Google Patents
Welding self-tapping screw and its machine-shaping method Download PDFInfo
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- CN101169149A CN101169149A CNA200610032474XA CN200610032474A CN101169149A CN 101169149 A CN101169149 A CN 101169149A CN A200610032474X A CNA200610032474X A CN A200610032474XA CN 200610032474 A CN200610032474 A CN 200610032474A CN 101169149 A CN101169149 A CN 101169149A
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- screw
- drilling portion
- screw rod
- thread
- tapping screw
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Abstract
The invention discloses a welded self-tapping screw and a processing molding method thereof. The welded self-tapping screw includes a screw body and a drilling part, wherein, the screw body has a head part, the head part extends with a screw rod, and a screw thread is arranged on the external edge of the screw rod. The drilling part is joined on the rod end edge of the screw rod, a drill tail part is formed on the lower edge of the drilling part, and the rigidity of the material is higher than the working pieces fixed by a drill lock. The processing molding method of the welded self-tapping screw includes the follow procedures: the screw rod with a head part is molded of stainless steel, the drilling part is molded of carbon steel, a cutting head is formed by forging or cutting the drill tail part of the drilling part; surface hardening heat treatment is conducted on the drilling part; the screw rod and the drilling part are connected fixedly and axially; the surface of the screw rod is rolled to form the screw thread. The processing method of the invention is simple with mechanical process, and the processing cost is low, so that the weld of the self-tapping screw has strong toughness.
Description
Technical field
The present invention relates to a kind of welding self-tapping screw and machine-shaping method thereof, be meant functional character especially, with the welding self-tapping screw and the machine-shaping method thereof of two section type structure composition according to the different operating position.
Background technique
The welding self-tapping screw of forming by a kind of member that uses unlike material on the market, wherein the screw body is to be made by stainless steel, drilling portion then be select for use through heat treated high hardness carbon steel material made; Therefore still rustless characteristics after the boring ability that makes welding self-tapping screw have excellence reaches and uses for a long time.
As shown in Figure 1, known welding self-tapping screw promptly adopts the mode of the synthetic solid memder of two component groups, and the step of its machine-shaping method is: forge processing, alloy high carbon steel and stainless steel are processed into required profile; Welding processing welds together forging two good members; The high frequency tempering, this member is softening, in order to back processing procedure processing; Car is repaiied processing, and the trimming of weld projection is carefully and neatly done; The processing of folder tail, the drill bit moulding of manufacturing drilling portion; The worm tooth line is made in the processing of rolling tooth; High frequency quenches, with the carbon steel material selective hardening sclerosis of this member; Electroplating surface is electroplated antirust processing, prevents the corrosion of high carbon steel material end; Above-mentioned production process is promptly finished the making of known welding self-tapping screw.
Have excellent boring ability and antirust ability concurrently though known welding self-tapping screw reaches, its working process is loaded down with trivial details and use too much human resources (repairing processing and high frequency quenching as high frequency tempering, car), causes being difficult to improve output and reducing cost.Again, disadvantage is that drilling portion must be for containing the steel of high carbon, make and behind the high frequency heating quenching, to obtain hardening usefulness (martensite tissue), there is the drilling ability side, though reach the hardness purpose, weld is often too high because of hardness, and the anxiety of embrittlement is arranged, if show consideration for the toughness of weld, but be difficult to keep the hardness requirement of drilling portion.
Summary of the invention
Technical problem to be solved by this invention is, at the deficiencies in the prior art, provides a kind of joint toughness strong and can save manpower, a large amount of production, and welding self-tapping screw that reduces cost and machine-shaping method thereof.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of welding self-tapping screw comprises: a screw body, have a head, and this head is extended with a screw rod, is formed with screw thread in this screw rod outer rim; And a drilling portion, be engaged in this screw rod ora terminalis, be formed with one in its lower edge and bore afterbody, and material hardness is greater than the fixing workpiece of drilled lock.
Further being improved to of such scheme: this screw body is the rust-proofing material.This drilling portion is a low-carbon steel material, after processing, can become the surface hardness height and the low structure of centre hardness.This drilling portion more extends and has a thread section, to engage with this screw rod.This screw rod engages with case-hardened this drilling portion.
A kind of machine-shaping method of welding self-tapping screw comprises following steps: have the screw rod of head with stainless steel moulding one, mold a drilling portion with carbon steel in addition; Forge or cut the brill afterbody of this drilling portion, make it form a cutting head; Impose the surface hardening heat treatment of drilling portion; Axial affixed this screw rod and drilling portion; And roll over this screw surface of system to form screw thread.
Further being improved to of said method: the upper limb of this drilling portion is rolled over and is shaped on a thread section, and the screw thread of this thread section and this screw surface is along connecing.The screw thread of this thread section and this screw surface along the method that connects for one fixedly the dental lamina end face to be provided with an identical screw thread wide and be that tapering type screw thread locating slot, this thread section of confession are easy to be positioned this fixedly on the dental lamina.
Compared with prior art, the beneficial effects of the utility model are: the engineering of machine-shaping method of the present invention is simple and be machining, save manpower processing, and welding processing can produce drawing effect and the processing of rolling tooth can be repaired appearance in passing, be fit to the low-cost welding self-tapping screw of making; Low-carbon steel material is adopted by this drilling portion, after carburizing heat treatment, and the surface hardness height, centre hardness is low, does not have the anxiety that produces the martensite embrittlement in weld, makes weld toughness foot, torsion height, steady quality.
The technology contents and the constitutive requirements of being taken off in order further to understand the present invention below cooperate diagram to be illustrated.
Description of drawings
Fig. 1 is the schematic representation of the machine-shaping method of known welding self-tapping screw;
Fig. 2 is the three-dimensional exploded view of welding self-tapping screw of the present invention;
Fig. 3 A～3G is the schematic representation of machine-shaping method step of the present invention;
Fig. 4 rolles over the plan view of tooth processing machine for machine-shaping method of the present invention;
Fig. 5 is the schematic top plan view of machine-shaping method thread surface processing of the present invention;
The plan view that Fig. 6 rolles over tooth processing for the rolling tooth processing machine and the welding self-tapping screw preparation of machine-shaping method of the present invention comprehensively;
Fig. 7 is positioned over the stereogram of screw thread locating slot for the thread section of machine-shaping method of the present invention;
Fig. 8 is the screw thread locating slot side view of machine-shaping method of the present invention;
Fig. 9 rolles over the schematic top plan view of tooth processing comprehensively for machine-shaping method of the present invention.
Label declaration:
10 screw bodies, 11 heads
12 screw rods, 13 screw threads
Afterbody bores in 20 drilling portions 21
22 thread sections 23 are cut portion
24 little protruding things 30,40 are rolled over the tooth processing machines
31,41 fixing dental lamina 32,42 movable dental laminas
33 keep away bits groove 43 screw thread locating slots
S, H screw thread are wide
Embodiment
As shown in Figure 2, this welding self-tapping screw comprises a screw body 10 and a drilling portion 20, this screw body 10 is stainless steel (as a galvanized iron 302 or 304), have a head 11 and extend a screw rod 12 from head 11, be formed with screw thread 13 in screw rod 12 outer rims, and ora terminalis and drilling portion 20 are bonded with each other.
This drilling portion 20 is low-carbon steel material (as carbon steel 1022C), is formed with one in its lower edge and bores afterbody 21, makes its hardness greater than the fixing workpiece of drilled lock, and has good machinability and antiwear property.In addition, in feasible embodiment, drilling portion 20 upper limbs are also extensible to have a thread section 22, screw thread that these thread section 22 outer rims form and the screw thread on screw rod 12 surfaces 13 suitable connecing.
By above stated specification as can be known, welding self-tapping screw is formed by two component compositions, wherein screw body 10 adopts the rust-proofing material to make, drilling portion 20 selects for use the high hardness material made, make welding self-tapping screw except the boring ability is good, also can still can be antirust after long-time the use, and keep good crystallized ability.
Consult Fig. 3 A～Fig. 3 G, the machine-shaping method of welding self-tapping screw is handled by machining entirely, at first as shown in Figure 3A, with the screw forging machine screw body 10 is created this head 11; With the screw forging machine processing is cut out by drilling portion 20, make drilling portion 20 be a cylindrical body.Shown in Fig. 3 B, will bore afterbody 21 with folder tail processing machine and press from both sides tail processing, make brill afterbody 21 be made into a cutting head, the appearance of boring afterbody 21 this moment coats one and cuts portion 23; After boring afterbody 21 processing, edge also has an extension rod thereon.Shown in Fig. 3 C, further extension rod is done thread surface processing with rolling over the tooth processing machine.
As shown in Figure 4, this rolling tooth processing machine 30 be provided with one fixedly dental lamina 31, one movable dental lamina 32 and keep away bits groove 33, this keeps away bits groove 33 for tapering type, when workpiece is leniently located to move to narrow place, if workpiece is excessive, will be excluded outside narrow place; The thread surface procedure is positioned over the fixedly dental lamina 31 of being failure to actuate with the initial position of drilling portion 20 as shown in Figure 5, after movable dental lamina 32 begins to start, can drive this drilling portion 20 and move, and the tooth line is rolled on the surface of extension rod; When movable dental lamina 32 drives these drilling portions 20 when keeping away bits groove 33, this cuts portion 23 because of being excluded outside narrow place by narrow place, has therefore broken away from the surface of brill afterbody 21; When movable dental lamina 32 is stopped action, drilling this moment portion 20 promptly finishes the rolling tooth, and this extension rod promptly becomes this thread section 22.
Shown in Fig. 3 D, with heat treatment furnace drilling portion 20 is carried out carburizing heat treatment, make its surface have hardness HV680-700, heart portion has toughness HV350-400, make (FASTENER STANDARDS SAE J78) according to the inclined to one side reference value upper limit of U.S.'s fastener standard hardness, only do the not tempering of quenching.
Shown in Fig. 3 E, after the processing of finishing screw body 10 and drilling portion 20, two members can be carried out welding processing with touching welding machine, make two members shaft to affixed one-tenth one member; During welding,,, produce drawing effect, so after the welding processing, the hardness of this drilling portion 20 is slightly reduced to HV600-650 for drilling portion 20 because of suitable temperature is provided.In addition, during welding, can blowization at junction point, and produce little protruding thing 24.
Shown in Fig. 3 F, then welding self-tapping screw is rolled over tooth processing comprehensively with rolling over the tooth processing machine, mainly be that screw thread is made in the screw rod 12 surface rollings of this screw body 10, make little protruding thing 24 become the part of screw thread in the lump, to roll over the tooth procedure as follows comprehensively.
As shown in Figure 6, this rolles over tooth processing machine 40 is identical machinery with rolling over tooth processing machine 30 (shown in Figure 4), be provided with fixedly dental lamina 41, one a movable dental lamina 42 and a screw thread locating slot 43, should be fixedly dental lamina 41 with fixing dental lamina 31 identical tooth line is arranged, this activity dental lamina 42 has identical tooth line with movable dental lamina 32.Screw thread locating slot 43 forms for the tooth line of fixing dental lamina 41 extends, so the tooth distance is all identical, so the tooth line of thread section 22 can be corresponding with the tooth line of fixedly dental lamina 41, movable dental lamina 42 and screw thread locating slot 43.
To shown in Figure 8, the thread section 22 of welding self-tapping screw is positioned over screw thread locating slot 43 as Fig. 6, this screw thread locating slot 43 be tapering type, and promptly fixedly the tooth line of dental lamina 41 extends the wide H of formation one screw thread earlier, continue to extend to form the wide S of screw thread again, but S is greater than H.Thread section 22 slips into screw thread locating slot 43 easily from the end than the wide S of major thread earlier, along tooth line lines, thread section 22 is embedded driving fit in the wide H part of screw thread, be that welding self-tapping screw moves to the fixedly ready position of dental lamina 41, so the design of screw thread locating slot 43 can make thread section 22 be positioned easily fixedly on the dental lamina 41.
As shown in Figure 9, after thread section 22 is positioned at ready position, movable dental lamina 42 is moved to ready position, be that tooth is rolled on deployable screw rod 12 surfaces, roll in the tooth process be that tooth line along thread section 22 is to the extension of the surface of screw rod 12, and taking advantage of a situation makes little protruding thing 24 become the part of tooth line, makes its tooth line lines carefully and neatly done.
Shown in Fig. 3 G, last, with slot rolling formula electroplating machine this welding self-tapping screw is carried out electroplating surface, promptly finish the manufacturing of this welding self-tapping screw.
The engineering of machine-shaping method of the present invention is simple and be machining, saves manpower processing, and welding processing can produce drawing effect and the processing of rolling tooth can be repaired appearance in passing, is fit to the low-cost welding self-tapping screw of making; Low-carbon steel material is adopted by this drilling portion, after carburizing heat treatment, and the surface hardness height, centre hardness is low, does not have the anxiety that produces the martensite embrittlement in weld, makes weld toughness foot, the torsion height, steady quality is one to have exquisite engineering method in fact.
Claims (8)
1. welding self-tapping screw comprises: a screw body, have a head, and this head is extended with a screw rod, is formed with screw thread in this screw rod outer rim; And a drilling portion, be engaged in this screw rod ora terminalis, be formed with one in its lower edge and bore afterbody, it is characterized in that the material hardness of described drilling portion is greater than the fixing workpiece of drilled lock.
2. welding self-tapping screw according to claim 1 is characterized in that, this screw body is the rust-proofing material.
3. welding self-tapping screw according to claim 1 is characterized in that, this drilling portion is a low-carbon steel material, after processing, can become the surface hardness height and the low structure of centre hardness.
4. welding self-tapping screw according to claim 1 is characterized in that, this drilling portion more extends and has a thread section, to engage with this screw rod.
5. welding self-tapping screw according to claim 1 is characterized in that, this screw rod engages with case-hardened this drilling portion.
6. the machine-shaping method of a welding self-tapping screw is characterized in that comprising following steps:
Have the screw rod of head with stainless steel moulding one, mold a drilling portion with carbon steel in addition;
Forge or cut the brill afterbody of this drilling portion, make it form a cutting head;
Impose the surface hardening heat treatment of drilling portion;
Axial affixed this screw rod and drilling portion; And
Roll over this screw surface of system to form screw thread.
7. according to the machine-shaping method of the described welding self-tapping screw of claim 6, it is characterized in that the upper limb of this drilling portion is rolled over and is shaped on a thread section, the screw thread of this thread section and this screw surface is along connecing.
8. according to the machine-shaping method of the described welding self-tapping screw of claim 7, it is characterized in that, the screw thread of this thread section and this screw surface along the method that connects for one fixedly the dental lamina end face to be provided with an identical screw thread wide and be that tapering type screw thread locating slot, this thread section of confession are easy to be positioned this fixedly on the dental lamina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610032474XA CN101169149A (en) | 2006-10-27 | 2006-10-27 | Welding self-tapping screw and its machine-shaping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610032474XA CN101169149A (en) | 2006-10-27 | 2006-10-27 | Welding self-tapping screw and its machine-shaping method |
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| Publication Number | Publication Date |
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| CN101169149A true CN101169149A (en) | 2008-04-30 |
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| CNA200610032474XA Pending CN101169149A (en) | 2006-10-27 | 2006-10-27 | Welding self-tapping screw and its machine-shaping method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422584A (en) * | 2016-01-11 | 2016-03-23 | 太仓市德浩紧固件有限公司 | Detachable drill tail screw |
| TWI640379B (en) * | 2016-07-08 | 2018-11-11 | 喜利得股份有限公司 | Screw and method of manufacturing same |
| CN109986225A (en) * | 2018-12-24 | 2019-07-09 | 庆达科技股份有限公司 | The welding method of composite screws |
| JP2021515848A (en) * | 2018-03-08 | 2021-06-24 | ヒルティ アクチエンゲゼルシャフト | Bimetal screws with martensite curable steel |
-
2006
- 2006-10-27 CN CNA200610032474XA patent/CN101169149A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422584A (en) * | 2016-01-11 | 2016-03-23 | 太仓市德浩紧固件有限公司 | Detachable drill tail screw |
| TWI640379B (en) * | 2016-07-08 | 2018-11-11 | 喜利得股份有限公司 | Screw and method of manufacturing same |
| CN109312771A (en) * | 2016-07-08 | 2019-02-05 | 喜利得股份公司 | Screw and manufacturing method |
| JP2021515848A (en) * | 2018-03-08 | 2021-06-24 | ヒルティ アクチエンゲゼルシャフト | Bimetal screws with martensite curable steel |
| CN109986225A (en) * | 2018-12-24 | 2019-07-09 | 庆达科技股份有限公司 | The welding method of composite screws |
| CN109986225B (en) * | 2018-12-24 | 2021-08-17 | 庆达科技股份有限公司 | Welding method of composite screw |
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