CN202140393U - Tapping screw for engineering plastic - Google Patents
Tapping screw for engineering plastic Download PDFInfo
- Publication number
- CN202140393U CN202140393U CN201120213675U CN201120213675U CN202140393U CN 202140393 U CN202140393 U CN 202140393U CN 201120213675 U CN201120213675 U CN 201120213675U CN 201120213675 U CN201120213675 U CN 201120213675U CN 202140393 U CN202140393 U CN 202140393U
- Authority
- CN
- China
- Prior art keywords
- tooth
- plane
- screw
- slope
- degrees
- 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.)
- Expired - Lifetime
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 34
- 229920006351 engineering plastic Polymers 0.000 title claims abstract description 13
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 12
- 238000009434 installation Methods 0.000 description 4
- 229920006834 PC+ABS Polymers 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Images
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
- F16B25/0047—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 the ridge being characterised by its cross-section in the plane of the shaft axis
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Connection Of Plates (AREA)
Abstract
The utility model relates to a tapping screw for engineering plastic. The tapping screw comprises a screw head and a screw rod, wherein a spiral thread is arranged on the screw rod, an outer contour of a threaded tooth-shaped section is composed of an inner slope, a middle slope, an outer slope and a tooth top face from the bottom and the top of a screw rod tooth, the inner slope, the middle slope, the outer slope and the tooth top face are in the arrangement of central symmetry and are mutually connected in sequence, the tooth top face is connected with the outer slope, a tooth-shaped angle (alpha) of the inner slope is 140 degrees plus 3 degrees to minus 3 degrees, the length (L1) of an inner tooth is 1/5 of the total length of a threaded tooth, a tooth-shaped angle (beta) of the middle slope is 20 degrees plus 3 degrees to minus 3 degrees, the length (L2) of a middle tooth is 2/5 of the total length of the threaded tooth, the tooth-shaped angle (gamma) of the outer slope is 30 degrees plus 3 degrees to minus 3 degrees, and the length (L3) of an outer tooth is 2/5 of the total length of the threaded tooth. When the tapping screw is adopted, the stability of multiple connections can be improved which connection requirements are met, and the service life of the tapping screw is prolonged.
Description
Technical field
The utility model relates to a kind of engineering plastics and uses tapping screw, belongs to the tapping screw technical field.
Background technique
The screw thread that engineering is assembled on the used tapping screw is a helical, utilizes self worm structure internal thread that tapping cooperates with it in pre-manufactured hole during the tapping screw assembling, and then accomplishes assembling.Tapping screw mainly adopts V thread screw at present, and the tooth form angle of V thread screw has the thick and advantages of high strength of root of the tooth usually at 50～60 ° with respect to other tooth form, so be used for connecting more.But also bigger because of the tooth form angle, when screw is shot, exist bigger radial force; And make axial thrust load less, owing to be unfavorable for connecting flowing of material, so it is big to exist mounting torque; Be difficult for tapping and connect on the material, simultaneously under certain wall thickness condition, also because its radial tension is bigger; Be prone to cause the damage that connects material, the dismounting back is difficult for connecting again once more, thus the tapping screw of this kind structure to repeat installation property relatively poor.And for the screw thread of isosceles trapezoid, though tooth form angle α=30 °, its efficient is lower than square threaded form; Have the processing of being easy to, good to neutrality, root of the tooth intensity advantage of higher; But owing to can only bear unidirectional load; Therefore be widely used in the power screw, and be not suitable for connection, so tapping screw usually need not.The thread profile of above-mentioned two kinds of structures, its tooth form inclined-plane and the core diameter of thread all adopt rounded feature, and the tooth form angle is single angle in addition, so the root of the tooth width can not further increase.The tooth form angle is the important structure parameter of tapping screw; Its direct shadow is to installation capability, intensity and the life-span of tapping screw; And the present tapping screw tooth form angle of adopting wide-angle, so tapping screw connect flowability on the material, repeatedly the stability and the aspects such as tension and torsional property of installation capability exist not enough.
Summary of the invention
The purpose of the utility model provides and a kind ofly in satisfied connection needs, can improve repeatedly connection stability, and the engineering plastics that increase the service life are used tapping screw.
The utility model is that the technological scheme that achieves the above object is: a kind of engineering plastics are used tapping screw; Comprise screw head and screw rod; Described screw rod is provided with spiral helicine screw thread; It is characterized in that: extremely screw rod crest at the bottom of the screw rod tooth; The external frame in thread profile cross section by be symmetrical set along the center, and interior inclined-plane, middle inclined-plane, the outer inclined-plane that links to each other successively and the crest face that links to each other with outer inclined-plane constitute, the tooth form angle α on interior inclined-plane is 1/5 of a thread profile total length at 140 ° ± 3 °, the long L1 of interior tooth, the tooth form angle β on middle inclined-plane is 2/5 of a thread profile total length at 20 ° ± 3 °, the long L2 of middle tooth; The tooth form angle γ on outer inclined-plane is at 30 ° ± 3 °, and the long L3 of outer tooth is 2/5 of a thread profile total length.
Its screw flight cross section of the tapping screw of the utility model is made up of interior inclined-plane, middle inclined-plane, outer inclined-plane and crest face, constitute different tooth form angles through interior inclined-plane, middle inclined-plane and outer inclined-plane, and the tooth form angle on each inclined-plane is controlled at 140 ° ± 3 ° respectively; 20 ° ± 3 ° and 30 ° ± 3 °, because the tooth form angle on outer inclined-plane is less, the tooth form angle on especially middle inclined-plane is less than the tooth form angle on outer inclined-plane; Therefore when screw is shot, can make screw thread can bear bigger axial thrust load, and the radial tension can reduce the screw assembling time; Connect material displacement to guarantee that enough axial forces produce, and make the mobile convenience that connects material, be prone to shoot screw; Simultaneously also less because of radial tension; Guarantee to connect material and be not damaged, so when well satisfying the connection needs, also increase repeatedly connection stability; So it is good to repeat installation property, can increase the service life.The tooth form angle on tooth form angle and the middle inclined-plane of the utility model through outer inclined-plane and long through both teeth; Optimize the contact pressure of screw thread contact coverage rate; In the balance setting depth; Can obtain bigger side and cover, tension, twisting strength and the fatigue resistance of the tapping screw of the utility model are significantly improved, also can reduce manufacture cost simultaneously.The utility model adopts big tooth form angle with the interior inclined-plane of thread root, can allow to connect material and better contact with screw thread, can prevent the fracture of screw thread pressurized, and improve the Security and the fatigue resistance of thread root, avoids thread damage.
Description of drawings
Below in conjunction with accompanying drawing the embodiment of the utility model is made further detailed description.
Fig. 1 is the structural representations of the utility model engineering plastics with tapping screw.
Fig. 2 is the axial sectional structure schematic representation of the utility model engineering plastics with tapping screw.
Fig. 3 is the I place structure for amplifying schematic representation of Fig. 2.
Wherein: 1-screw head, 2-screw rod, the outer inclined-plane of 3-, inclined-plane in the middle of the 4-, inclined-plane in the 5-.
Embodiment
See that shown in Fig. 1～3, the engineering plastics of the utility model are used tapping screw, comprise screw head 1 and screw rod 2, this screw rod 2 is provided with spiral helicine screw thread, and this screw thread has outside diameter d 1, inner diameter d
0And pitch P, the total length of thread profile is (d1-d
0)/2, tip of thread are major diameter of thread d1, and Bottom of Thread is minor diameter of thread d
0Head polished rod length is X; From at the bottom of the screw rod tooth to the screw rod crest; The external frame in the thread profile cross section of the utility model is made up of the interior inclined-plane 5, middle inclined-plane 4, the outer inclined-plane 3 that are symmetrical set along the center, also link to each other successively and the crest face that links to each other with outer inclined-plane 3, makes the sidepiece of thread profile cross section external frame form three-stage structure, and the corresponding tooth form angle that forms multi-angle; The utility model is because three inclined-planes of thread profile cross section external frame are to be symmetrical set along central axis, so have better machining property.See shown in Figure 3ly, the tooth form angle α on the interior inclined-plane 5 of the utility model thread profile cross section external frame symmetry is at 140 ° ± 3 °, preferably in the tooth form angle α on inclined-plane 5 at 140 ° ± 1 °; Because the tooth form angle α on interior inclined-plane 5 is greater than 120 °; Should the interior long L1 of tooth be 1/5 of thread profile total length, obviously improve thread root intensity, prevent the fracture of screw thread pressurized; And cause thread damage, improve the working life of tapping screw.See Fig. 2, shown in 3; Inclined-plane 4 its tooth form angle β were at 20 ° ± 3 ° in the middle of the utility model was symmetrically arranged; The tooth form angle β on inclined-plane 4 is at 20 ° ± 1 ° preferably, and the long L2 of middle tooth on this inclined-plane, centre 4 is 2/5 of thread profile total lengths, can increase the axial force that produces when tapping screw screws in through the tooth form angle β on middle inclined-plane 4; Help connecting flowing of material, be convenient to tapping.See shown in Figure 3; Outer inclined-plane 3 its tooth form angle γ of the utility model symmetry are at 30 ° ± 3 °; The tooth form angle γ on preferably outer inclined-plane 3 is at 30 ° ± 1 °; The long L3 of outer tooth on outer inclined-plane 3 is 2/5 of thread profile total lengths, makes tapping screw have smallest radial component and bigger axial force, and convenient screw-in of tapping screw connected on the material.The utility model is owing to increased the axial force when screwing in the connection material; And the while also reduces radial force; So can finely satisfy the engineering plastics connection requirement; Be screwed into engineering with in plastics such as PC, ABS or the PC+ABS bottom outlet, under certain use condition, can reducing screw length and diameter, shown in the table 1 be by the utility model make from the merit screw and will be installed in mounting torque and the pulling-out force that connects back test on the material from the merit screw.
Table 1
This shows that the engineering plastics of the utility model have less mounting torque and reliable coupling torque with tapping screw.
Claims (2)
1. engineering plastics are used tapping screw; Comprise screw head (1) and screw rod (2); Described screw rod (2) is provided with spiral helicine screw thread; It is characterized in that: extremely screw rod crest at the bottom of the screw rod tooth; The external frame in thread profile cross section by be symmetrical set along the center, and interior inclined-plane (5), middle inclined-plane (4), outer inclined-plane (3) that link to each other successively and the crest face formation that links to each other with outer inclined-plane (3), the tooth form angle α of interior inclined-plane (5) is 1/5 of a thread profile total length at 140 ° ± 3 °, the long L1 of interior tooth, the tooth form angle β of middle inclined-plane (4) is 2/5 of a thread profile total length at 20 ° ± 3 °, the long L2 of middle tooth; The tooth form angle γ on outer inclined-plane (3) is at 30 ° ± 3 °, and the long L3 of outer tooth is 2/5 of a thread profile total length.
2. engineering plastics according to claim 1 are used tapping screw, it is characterized in that: in said the tooth form angle α on inclined-plane (5) at 140 ° ± 1 °, the tooth form angle β of middle inclined-plane (4) at 20 ° ± 1 °, the tooth form angle γ of outer inclined-plane (3) at 30 ° ± 1 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120213675U CN202140393U (en) | 2011-06-23 | 2011-06-23 | Tapping screw for engineering plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120213675U CN202140393U (en) | 2011-06-23 | 2011-06-23 | Tapping screw for engineering plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202140393U true CN202140393U (en) | 2012-02-08 |
Family
ID=45551451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120213675U Expired - Lifetime CN202140393U (en) | 2011-06-23 | 2011-06-23 | Tapping screw for engineering plastic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202140393U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278348A (en) * | 2011-06-23 | 2011-12-14 | 常州星宇车灯股份有限公司 | Tapping screw for engineering plastics |
| CN107652543A (en) * | 2017-10-17 | 2018-02-02 | 苏州华丰不锈钢紧固件有限公司 | A kind of high-strength insulating plastic cement screw |
-
2011
- 2011-06-23 CN CN201120213675U patent/CN202140393U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278348A (en) * | 2011-06-23 | 2011-12-14 | 常州星宇车灯股份有限公司 | Tapping screw for engineering plastics |
| CN102278348B (en) * | 2011-06-23 | 2013-11-27 | 常州星宇车灯股份有限公司 | Tapping screw for engineering plastics |
| CN107652543A (en) * | 2017-10-17 | 2018-02-02 | 苏州华丰不锈钢紧固件有限公司 | A kind of high-strength insulating plastic cement screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120208 Effective date of abandoning: 20131127 |
|
| RGAV | Abandon patent right to avoid regrant |