CN104533916A - Self-tapping screw with sawtooth threads - Google Patents
Self-tapping screw with sawtooth threads Download PDFInfo
- Publication number
- CN104533916A CN104533916A CN201410790939.2A CN201410790939A CN104533916A CN 104533916 A CN104533916 A CN 104533916A CN 201410790939 A CN201410790939 A CN 201410790939A CN 104533916 A CN104533916 A CN 104533916A
- Authority
- CN
- China
- Prior art keywords
- screw
- thread
- sawtooth
- tapping screw
- tapping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 57
- 230000007704 transition Effects 0.000 claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 210000000515 tooth Anatomy 0.000 description 32
- 229910000838 Al alloy Inorganic materials 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 241000692569 Stylephorus chordatus Species 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
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
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
Disclosed is a self-tapping screw with sawtooth threads. The end of a screw rod is a transition threaded area and is in the shape that the outer diameter is reduced and a circular truncated cone or a cone is extended. At least two to five circles or all of threads on the rod body or transition threaded area of the screw rod are sawtooth threads. The self-tapping screw can be easily screwed into an aluminum plate with the thickness of 4 mm and 1 mm, and tapping does not need to be carried out in advance, which the national-standard self-tapping screw pitch cannot easily complete.
Description
One, technical field
The invention provides a kind of tapping screw that particularly can play the effect preventing from loosening for material work piece such as slim aluminum alloys well.
Two, background technique
The firm efficiency of installation that tapping screw is used for structural member is high, good fixing effect, as CN03152296.3 relates to a kind of tapping screw, it has columniform outer diameter at the screw thread of Background Region (towards head), extends to reduce outer diameter towards the termination of screw at the screw thread of front area (deviating from head).The engagement bisector of angle recorded in threaded top relative to core axioversion locate, and, to tilt towards screw head at the bisector of front area from Background Region (the first cross section) towards front area (the second cross section) oppositely; The reversal point of thread cross-section should be placed like this: the first cross section is presented on Background Region, and the second cross section is presented on front area.
CNY201180070895. a kind of tapping screw that particularly can play the effect preventing from loosening for soft material workpiece such as resin aluminum alloys is well related to.Tapping screw comprises axle portion and at the shaping regular screw threads tooth of its side face, in institute's regular screw threads tooth, cut its top form tool withdrawal groove, make coupling protrusion shaping in the bottom surface of described tool withdrawal groove along part or all of end of the side connecting described regular screw threads tooth.According to described tapping screw, the excess thickness portion of having imbedded the workpiece of tool withdrawal groove embeds in coupling protrusion, even if workpiece expands like this, shrink or vibrate and also can play the effect preventing from loosening well.
CNY201110153790 tapping screw, the steel plate layer poststack that 2 thickness can be reached 0.8 millimeter does not link with not producing chip, even and 1 thickness reaches the steel plate of 1.6 millimeters, link with also can not producing helical chip.The end that Thread Forming TF is at one end provided with the cylindrical portion of head has coniform portion, the worm tooth in the worm tooth being located at the parallel thread portion of cylindrical portion and the tapered thread portion being located at coniform portion is made up of the worm tooth that pitch is thicker, wherein, it is that the acute angle of about 30 degree is coniform that coniform portion is formed as tip angle, the 2nd worm tooth extended abreast with the worm tooth in tapered thread portion is provided with in the end portion in coniform portion, two worm tooths are formed in the end portion in coniform portion, the axial length of the head pointed cone screw section be made up of these two worm tooths is more than or equal to the thickness of linked sheet metal.
CN201010232897. a tapping screw, its with little screw moment accurately tapping internal thread time can obtain larger fastening force, comprising: screw rod, it is from screw head to downward-extension; The externally threaded multiple spiral shell tooth of constant altitude, each own identical spiral shell tooth height, is formed at the part place extended immediately below screw head of screw rod; And reducing highly externally threaded multiple spiral shell tooth, its spiral shell tooth height reduces gradually towards the end face of masthead end portion, and they are formed continuously at the masthead end portion of screw rod and constant altitude outside thread; And tiny arc face, each joint office that it is reducing highly externally threaded upper and lower root surface and side, upper and lower is formed continuously, tiny arc face is formed as at least extending along the bottom root surface of constant altitude male threaded end spiral shell tooth and the attachment portion of lower side, and constant altitude male threaded end spiral shell tooth is continuous with reduction height outside thread.
The termination (tip) of general tapping screw reduces outer diameter and extends, but in the processing of the slim materials such as aluminum alloy, the pitch of the tapping screw of prior art is 1:2.5-4 with screw diameter ratio; Bad in the effect of the aluminum alloy thin section bar of fastening about 1mm, comparatively speaking, tapping screw pitch is wide, and as adopted the tapping screw of minor diameter, tightening force is also inadequate.Above-mentioned prior art fails head it off.
When tapping screw is applied to the workpiece of the materials such as fixing hardwood, man-made board (comprising wood veneer etc.), slim aluminum alloy or certain thickness Al alloy block, now, tapping screw needs there is stronger cutting function when screwing in when using, existing tapping screw is deficient function when applying this place.If very inadequate reinforcing screws in, driving moment requires very large, possible unfavorable as a result, screw can rupture or delayed fracture in fixed material, this just causes accident.
Three, summary of the invention
The object of the invention is, propose a kind of tapping screw with buttress thread, for the tapping screw of fixing hardwood, man-made board (comprising wood veneer etc.), slim aluminum alloy or certain thickness Al alloy block processing; Cutting function obviously increases, and can realize the reduction of driving moment and the raising of binding strength simultaneously, can be applicable to the fastening workpiece of the various sheet materials compared with hard material.Especially the tapping screw that length is longer more has this requirement.
Technological scheme of the present invention is: a kind of tapping screw with buttress thread, the end of screw rod is transition threaded area, be reduce outer diameter and extend round platform or coniform, the shaft of screw rod or transition threaded area are at least provided with 2-5 circle screw thread or whole screw thread is flexuose screw thread.
Further, transition threaded area is the threaded area being transitioned into screw rod shaft from tail end.
Further, first or second screw thread position of screw rod shaft is flexuose screw thread.
Further, the sawtooth of the sawtooth of the length of sides such as the sawtooth on flexuose screw thread is or inequilateral length.
Further, adjacent sawtooth is having staggered serration plane or in a plane.
Further, on a circle screw thread, sawtooth number is odd number, and is 3-15.
Further, screw thread sawtooth is oblique sawtooth or rip tooth.
One circle (one week) screw thread sawtooth number is odd number, as 3,5,7,9,11,13 etc.Screw thread sawtooth is that oblique sawtooth or rip tooth refer to the sawtooth that straight trough or skewed slot are formed.
Beneficial effect of the present invention: the present invention is when the tapping screw processed for fixing hardwood, man-made board (comprising wood veneer etc.), slim aluminum alloy or certain thickness Al alloy block; Cutting function obviously increases, and the reduction of driving moment and the raising of binding strength can be realized simultaneously, the fastening workpiece of the various sheet materials compared with hard material can be applicable to, can increase work efficiency, namely adopt electric tool or manual need not be hard especially when being screwed into, such screw can not rupture or delayed fracture in fixed material.Especially the tapping screw that length is longer more has this requirement.The radius of transition screw is less than the radius of the main thread of the threaded area of middle screw rod, so can not affect the retention force of whole tapping screw.
In the processing of the slim materials such as aluminum alloy, with the pitch of tapping screw of the present invention and the goods of screw diameter ratio, at aluminum alloy thin section bar effective of fastening about 1-3mm; As being connected with man-made board 5mm for aluminium alloy plate thickness 1.4mm.Screw of the present invention adopts 4.8mm external diameter.Former technique to formerly hole after tapping tooth, then to connect with screw, consuming time like this, work consuming.As adopted tapping screw of the present invention, after boring, do not need tapping, because adopting the cutting power of transition screw thread to be directly easily screwed into, while being screwed into can in hole the efficiency of automatic screw high and effective.The present invention easily can be screwed into thickness and be connected at 5mm with l-2mm aluminium sheet, does not need first tapping, and existing GB tapping screw tooth distance has been difficult to.Former GB tapping screw, because aluminium sheet is thick, when being screwed into, resistance is too large, is not easily screwed into: the present invention can also close and firm 2 blocks of about 2mm aluminium sheets, are not easy to loosen after fixing.Reduce cutting force in the application of sawtooth, and do not affect the fastening force of screw.
Four, accompanying drawing explanation
Fig. 1,2 is respectively the tapping screw structural representation of three rack saw profile of tooth Full Thread FT teeth;
Fig. 3 is the tapping screw structural representation of five rack saw profiles of tooth, transition screw thread five teeth;
The tapping screw structural representation of the taper serration of Fig. 4 seven tooth or 9 teeth;
Fig. 5 is the irregular saw tooth structure schematic diagram of the present invention.
Fig. 6-10 is the cross-sectional structure schematic diagram that the present invention one encloses (flank of thread) buttress thread respectively, is respectively the schematic cross-section of 3,5,7,9 or irregular tooth.
Five, embodiment
As Figure 1-5, screw thread is provided with sawtooth 3, and profile of tooth comprises the full sawtooth of screw thread, first sawtooth, second sawtooth, tiltedly sawtooth, rip tooth, and screw thread tail end can have horizontal tail or fine stern two kinds of forms.
Fig. 3,4,5 is a kind of tapping screws with buttress thread of the present invention, the threaded area 2 of screw rod 1 extends for reducing outer diameter, the end of screw rod is transition threaded area, be reduce outer diameter and extend round platform or coniform, the screw thread of transition threaded area is at least provided with 2-4 circle screw thread or whole screw thread is flexuose screw thread.Often circle on the screw thread of transition threaded area has 5,7,9 teeth, and this tooth is oblique sawtooth or rip tooth, and screw thread tail end can have horizontal tail or fine stern two kinds of forms.
It is the most common that the screw thread of transition threaded area has 5 to 9 circles.The screw thread of transition threaded area is transitioned into the threaded area of middle screw rod again.The screw thread of transition threaded area is identical with the spacing of the screw thread of middle screw rod; But also can not be identical.
In concrete structure: the pitch of screw thread is 1:5.5-9 with middle screw rod diameter ratio; The tip of screw rod is round platform or coniform portion.The pitch of screw thread is 1:6-8 with middle screw rod diameter than especially.Tapping screw middle screw rod diameter is generally at 2-6mm; But the present invention can be applied to thicker diameter and tapping screw.
The screw thread of transition threaded area is at least provided with 2-5 circle screw thread or whole screw thread is flexuose screw thread,
The present invention can also be used for the wider self tapping screw of tapping screw pitch, as adopted the tapping screw of minor diameter, tightening force does not also subtract, in general, the tapping screw that the present invention is used for the long diameter of length thin is better, and tubbiness type tapping screw is screwed into short, advantage of the present invention does not show, but application is not a problem.
Because the longest tapping screw can reach 50mm, so longer screw has the transition screw thread of more multiple number of threads, better effects if.Self tapping screw of the present invention may adopt the self tapping screw boring stern construction.
Fig. 6-10 is the cross-sectional structure schematic diagram that the present invention one encloses (flank of thread) buttress thread respectively.From the cross section that flexuose screw thread one encloses, the sawtooth of the length of sides such as sawtooth 3 can be, also can be the sawtooth (as shown in Figure 2) of inequilateral length, adjacent sawtooth can be staggered (having staggered plane), also can be in a plane.Namely adjacent saw-tooth is flat.The sawtooth number of amounting to Cheng Yiquan (one week) buttress thread is odd number, as 5,7,9,11,13 etc.But due to the continuous rotation of screw thread, amount to Cheng Yiquan be not integer also can, mainly get rid of even number sawtooth, the symmetry properties of even number sawtooth is good, can have influence on cutting force.
Pitch of the present invention little or all can use greatly, screw thread and horizontal oblique angle are less than 12 degree (flight pitch is little), are generally 9-12 degree.Screw thread and horizontal oblique angle are 10-11 degree.
Transition threaded area, is reduce outer diameter and extend round platform or coniform, can forms certain tail cone angle, and the present invention limits without special this.
The embodiment of the present invention non-limiting scope of the present invention, any simple replacement according to the invention or improve the scope not exceeding the claims in the present invention protection.
Claims (7)
1. have a tapping screw for buttress thread, the end of screw rod is transition threaded area, is to reduce outer diameter and extend round platform or coniform, it is characterized in that the shaft of screw rod or transition threaded area be at least provided with 2-5 enclose screw thread or all screw thread be flexuose screw thread.
2. the tapping screw with buttress thread according to claim 1, is characterized in that transition threaded area is the threaded area being transitioned into screw rod shaft from tail end.
3. the tapping screw with buttress thread according to claim 1, is characterized in that first or second screw thread position of screw rod shaft is flexuose screw thread.
4., according to the tapping screw with buttress thread one of claim 1-3 Suo Shu, the sawtooth that it is characterized in that on flexuose screw thread such as is at the long sawtooth of the sawtooth of the length of side or inequilateral.
5., according to the tapping screw with buttress thread one of claim 1-3 Suo Shu, it is characterized in that adjacent sawtooth is having staggered serration plane or in a plane.
6. according to the tapping screw with buttress thread one of claim 1-3 Suo Shu, it is characterized in that on a circle screw thread, sawtooth number is odd number, and be 3-15.
7., according to the tapping screw with buttress thread one of claim 1-3 Suo Shu, it is characterized in that screw thread sawtooth is oblique sawtooth or rip tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790939.2A CN104533916A (en) | 2014-12-18 | 2014-12-18 | Self-tapping screw with sawtooth threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790939.2A CN104533916A (en) | 2014-12-18 | 2014-12-18 | Self-tapping screw with sawtooth threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104533916A true CN104533916A (en) | 2015-04-22 |
Family
ID=52849504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410790939.2A Pending CN104533916A (en) | 2014-12-18 | 2014-12-18 | Self-tapping screw with sawtooth threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104533916A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179414A (en) * | 2015-10-23 | 2015-12-23 | 无锡市华晨标准件有限公司 | Auto-drilling-and-chambering self-tapping screw |
| CN108644204A (en) * | 2018-05-31 | 2018-10-12 | 宜兴市怡光环保机械有限公司 | One kind is anti-to break through anti-loosening container floor nail and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR324614A (en) * | 1902-09-19 | 1903-04-06 | Gousset Louis Eugene Edmond | Grooved wood screw |
| US1802560A (en) * | 1923-04-04 | 1931-04-28 | Arthur C Kerwin | Masonry bolt |
| GB667051A (en) * | 1949-09-16 | 1952-02-20 | Gkn Group Services Ltd | Improvements in or relating to self-tapping screws |
| CN201425048Y (en) * | 2009-06-22 | 2010-03-17 | 徐国泰 | Wood screw structure |
| EP2386769B1 (en) * | 2010-05-14 | 2012-05-09 | Taiwan Shan Yin Int'l Co., Ltd. | A screw with low drilling resistance |
| US20130039720A1 (en) * | 2011-08-11 | 2013-02-14 | Sheng-Tsai SHIH | Screw |
| CN204512124U (en) * | 2014-12-18 | 2015-07-29 | 无锡昱兴建筑五金有限公司 | A kind of tapping screw with buttress thread |
-
2014
- 2014-12-18 CN CN201410790939.2A patent/CN104533916A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR324614A (en) * | 1902-09-19 | 1903-04-06 | Gousset Louis Eugene Edmond | Grooved wood screw |
| US1802560A (en) * | 1923-04-04 | 1931-04-28 | Arthur C Kerwin | Masonry bolt |
| GB667051A (en) * | 1949-09-16 | 1952-02-20 | Gkn Group Services Ltd | Improvements in or relating to self-tapping screws |
| CN201425048Y (en) * | 2009-06-22 | 2010-03-17 | 徐国泰 | Wood screw structure |
| EP2386769B1 (en) * | 2010-05-14 | 2012-05-09 | Taiwan Shan Yin Int'l Co., Ltd. | A screw with low drilling resistance |
| US20130039720A1 (en) * | 2011-08-11 | 2013-02-14 | Sheng-Tsai SHIH | Screw |
| CN204512124U (en) * | 2014-12-18 | 2015-07-29 | 无锡昱兴建筑五金有限公司 | A kind of tapping screw with buttress thread |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179414A (en) * | 2015-10-23 | 2015-12-23 | 无锡市华晨标准件有限公司 | Auto-drilling-and-chambering self-tapping screw |
| CN108644204A (en) * | 2018-05-31 | 2018-10-12 | 宜兴市怡光环保机械有限公司 | One kind is anti-to break through anti-loosening container floor nail and preparation method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150422 |