CN111853020A - Self-tapping screw quickly installed on plastic part and machining device of self-tapping screw - Google Patents
Self-tapping screw quickly installed on plastic part and machining device of self-tapping screw Download PDFInfo
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- CN111853020A CN111853020A CN202010716813.6A CN202010716813A CN111853020A CN 111853020 A CN111853020 A CN 111853020A CN 202010716813 A CN202010716813 A CN 202010716813A CN 111853020 A CN111853020 A CN 111853020A
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- 229920003023 plastic Polymers 0.000 title claims abstract description 55
- 239000004033 plastic Substances 0.000 title claims abstract description 55
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 31
- 238000003754 machining Methods 0.000 title description 2
- 239000011295 pitch Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000010791 quenching Methods 0.000 claims abstract description 3
- 230000000171 quenching effect Effects 0.000 claims abstract description 3
- 238000005496 tempering Methods 0.000 claims abstract description 3
- 230000003068 static effect Effects 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000007514 turning Methods 0.000 claims description 7
- 238000009713 electroplating Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002929 anti-fatigue Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
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- 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
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
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- 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
- F16B25/0052—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 having indentations, notches or the like in order to improve the cutting behaviour
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The invention relates to a self-tapping screw quickly mounted on a plastic part, which comprises a head part and a screw rod part, wherein the screw rod part comprises a parallel screw thread part and a guide screw thread part, a thread ridge with consistent thread height is formed on the parallel screw thread part from the head part to the guide screw thread part, a thread ridge with gradually reduced thread height is formed on the guide screw thread part from the parallel screw thread part to the tail end of the screw rod part, the thread ridge comprises a tooth tip and a tooth bottom, the thread pitch of the thread ridge is 2.69mm, the length of the guide screw thread part is 2-2.5 thread pitches, and the included angle between the tangent line of the tooth tip of the guide screw thread part and the tangent line of the. By adopting the technical scheme, the thread part is used for connecting the steel part and the plastic part after quenching and tempering heat treatment, the self-extrusion screw enables the plastic part not to be processed by self-control, only one unthreaded hole is needed, the embedded nut is omitted, the connection locking strength can also meet the requirement of high strength, the plastic part is perfectly matched with plastic in the locking process, and the plastic is reduced to be damaged by heat energy generated by locking.
Description
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to a self-tapping screw quickly mounted on a plastic part and a processing device thereof.
Background
Along with the popularization of energy conservation and emission reduction, the automobile is increasingly light, the number of parts used by metal sheets and plastic parts is increased, and particularly, the connecting mechanism of the air filter assembly in an engine compartment is most prominent. The connection parts of the screw bodies are all self-tapping screws, and the screw which has good installation guide, high efficiency and good connection effect and can be directly connected on a plastic piece is needed.
The common self-tapping screw has small thread pitch, poor self-cutting performance and larger thread cutting surface, can generate larger radial force, is screwed into a bottom hole of a connected piece by the self-tapping screw to extrude threads in the bottom hole of the connected piece when being connected and assembled, has larger screwing torque, is easy to generate waste material extrusion, and is broken or a plastic piece is damaged when the resistance of the self-tapping screw with the hole length larger than 10mm is larger.
Along with the continuous deepening of industrial reform, promote intelligent manufacturing development, and then drive the whole transformation upgrading of industry structure. The localization of automobile parts is continuously enlarged, the manufacturing technology is continuously overtaken, and along with the intelligent construction of enterprises, the intelligentization of tooling dies is reflected, so that the high-efficiency, stable, safe and quick production of the enterprises is brought.
The utility model discloses a frock mould that production automotive fastener used, the dental lamina mould is the most commonly used screw thread instrument of fastener trade processing screw, the dental lamina mould commonly used only has a thread, machine-formed screw line is single, the usage is also limited, the screw that uses this kind of dental lamina mould commonly used to produce breaks very easily or can't get into at all when meetting the metal sheet, thereby lead to making into the influence in aspects such as safety to the assembly work, also can be in process of production because smooth tooth, the production beat is not smooth and leads to work efficiency low, the low scheduling problem of the qualification rate of producing, therefore we need a dental lamina mould that can easily get into the metal sheet, the screw of firm connection of high-efficient production.
Disclosure of Invention
In conclusion, in order to overcome the defects in the prior art, the invention provides the screw which has the advantages of assembly guiding, improvement on the vibration and loosening resistance, small thread self-tapping torque, difficulty in generating waste materials and improvement on the torsion and locking strength, particularly for the screw with remarkable effects on deep long holes and blind holes.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a self tapping type screw of quick installation in working of plastics, includes head and screw pole portion, screw pole portion includes parallel thread portion and direction screw portion, and parallel thread portion is formed with the thread tooth that the tooth height is unanimous from the head to direction screw portion, and direction screw portion is formed with the thread tooth that the tooth height gradually reduces from parallel thread portion to screw pole portion tail end, and the thread tooth includes prong and root, the pitch of thread tooth is 2.69mm, and the length of direction screw portion is 2 ~ 2.5 pitches, and the tangent line of direction screw portion prong is 8 ~ 10 with the tangent line contained angle of parallel thread portion prong, and this self tapping screw is through thermal refining heat treatment before the electroplating, and its hardness is 340 ~ 370HV, and its highest surface hardness is greater than 390 HV.
By adopting the technical scheme, the combination of the parallel thread part and the guide thread part can ensure that the threads are gradually shifted to the parallel thread part from small to large when entering the fitting part and are deflected during correction and assembly, thereby facilitating the operation and use of a manipulator, simultaneously ensuring that the threads in the fitting part are tighter, preventing the loosening and falling of the screw and enhancing the stability of the screw; the included angle between the tangent line of the tooth point of the guide thread part and the tangent line of the tooth point of the parallel thread part is 8-10 degrees, namely the tail end of the screw is in an inverted trapezoidal design, and the design can enable the screw to be positioned more quickly when being screwed into some materials needing to be fixed, so that the operation of operators is facilitated; the screw pitch is 2.69MM larger, and compared with the common screw pitch of M6 which is 1MM, the screw can be quickly installed; the self-tapping screw is subjected to carburizing heat treatment before electroplating, so that the strength, impact toughness and wear resistance of the screw are improved; the efficiency of the assembly is improved, reduce and twist the moment, the screw thread position is after quenching and tempering thermal treatment, self-tapping screw is in the installation, the looks accessory forms the screw thread through the extrusion, because the guide effect of screw thread front end, and tooth form angle is little, resistance is little when squeezing into the working of plastics, make the installation reliable and stable press from both sides tightly, but the wide application is in the connection with the working of plastics, because the lightweight and the low in manufacturing cost of working of plastics, now widely used in large batch car, this technical scheme is used for connecting steel part and working of plastics, self-extruding screw makes the working of plastics need not inlay the nut, only need a unthreaded hole, connection locking strength also can reach the requirement of high strength, with the perfect cooperation of plastics in locking process, and reduce because of the produced heat energy harm plastics of locking.
The invention further provides that: the tooth form angles of the parallel thread part and the guide thread part are both 30-35 degrees, the width of the cusp is 0.1-0.18 mm, and the top of the cusp is arc-shaped.
Through adopting above-mentioned technical scheme, further improve cutting performance, the tooth form angle tolerance is little simultaneously, and the moment of torsion is stable, and the cusp width is 0.1 ~ 0.18mm, has increased the cutting performance of screw, is difficult for the card pause, has increased the intensity of screw simultaneously, is difficult for the incomplete, and the cusp top is circular-arc, increases the contact surface, improves the antifatigue of use, the anti-seismic ability of moving locking moving.
The invention further provides that: the screw rod part is still including connecting the connecting portion of adjacent screw thread, connecting portion include respectively with the linkage segment that adjacent both ends screw thread links to each other and set up the changeover portion between the linkage segment of both ends, be provided with radius angle R1 between the root of a tooth and the screw rod part changeover portion, 0.1mm is not less than R1 is not less than 0.15mm, and the contained angle between the linkage segment of both ends is 140 +/-3, and the length of changeover portion is 0.2 +/-0.1 mm.
Through adopting above-mentioned technical scheme, further improve and attack moment, keep assembly stability, the rapidity when the enhancement screw installation that this kind of structure can be great simultaneously also can prevent the screw bending, causes the screw to twist off, has strengthened the practicality of screw greatly, and the contained angle between the both ends linkage segment is 140 +/-3, strengthens its appearance bits ability, and the root R of each position can play and prevent stress concentration phenomenon in addition, improves the life-span.
The invention further provides that: the turning starting tooth tip of the thread tooth is in a circular arc shape.
Through adopting above-mentioned technical scheme, increase the contact surface, improve the antifatigue degree of use, increase screw life.
The invention also provides a processing device of the self-tapping screw quickly installed on a plastic piece, which comprises a dental plate body, wherein the dental plate body comprises a movable dental plate and a static dental plate, both the static dental plate and the movable dental plate are provided with a tooth pattern groove with a constant helix angle, the tooth pattern groove forms a tooth tip and a tooth bottom in a cross-sectional view, two lines of the tooth tip end are crossed to form an included angle of 30-35 degrees, the tooth tip width is 0.1-0.18 mm, and the top of the tooth tip is in an arc shape.
By adopting the technical scheme, the dental points produced by the screws are prevented from being sharp, easily damaging materials and being blocked smoothly during assembly; the processed screw is efficient and stable when being assembled and used by a robot hand.
The invention further provides that: move the dental lamina and quiet dental lamina and all be equipped with pan feeding district, plastic screw thread district and ejection of compact district in proper order, move all be equipped with anti-skidding line, plastic profile on dental lamina and the quiet dental lamina and turn to afterbody profile, anti-skidding line sets up in the pan feeding district, the plastic profile sets up in plastic screw thread district and ejection of compact district, it sets up in dental lamina body bottom afterbody department to turn to the afterbody profile, the height of anti-skidding line is increased gradually to high together with plastic profile height from pan feeding district to plastic screw thread district, the plastic profile is parallel screw thread.
By adopting the technical scheme, the anti-slip threads have the functions that when the screw blank enters the dental plate die, the situation of difficult feeding and slipping of the fed material caused by rubbing off too many materials and extruding can not be caused, and the parallel threads are used for precise, rapid and stable production of the screw; the steering tail thread has the effects of fast guiding when the screw is assembled, being not easy to bend and break and the like, and can prevent eccentricity and tooth slippage during assembly.
The invention further provides that: the total length of the tooth plate body is h, the length of the feeding area is h1, the length of the h1 is more than or equal to 0.3h and less than or equal to 0.33h, the length of the shaping thread area is h2, and the length of the h2 is more than or equal to 0.5h and less than or equal to 0.6 h.
Through adopting above-mentioned technical scheme, compare in current dental lamina, the length ratio in its pan feeding district and plastic screw thread district is higher, makes production and processing more accurate, and the screw quality is more stable, and the mass production effect is showing.
The invention further provides that: the total length of the movable tooth plate is 165mm, and the total length of the static tooth plate is 150 mm.
Through adopting above-mentioned technical scheme, compare in current quiet dental lamina total length be 127mm for the specification, move the dental lamina total length and be 140mm, among this technical scheme, through the length that increases the dental lamina body, make screw blank screw thread shaping more accurate after getting into the dental lamina mould, more stable, the quality is higher.
The invention further provides that: when the static tooth plate and the movable tooth plate are arranged oppositely in parallel, the tail part forms an included angle of 8-10 degrees.
By adopting the technical scheme, the included angle of the tail end of the formed guide thread is 8-10 degrees, the structure can greatly enhance the rapidity of the screw during installation, and simultaneously can prevent the screw from bending to cause screw twisting off, thereby greatly enhancing the practicability of the screw.
The invention further provides that: the edge of the dental plate body is provided with an arc chamfer.
Through adopting above-mentioned technical scheme, the difficult slip and screw thread ending department can avoid the corner to collapse to fall when this dental lamina design pan feeding.
The examples describe specific embodiments of the present invention.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
FIG. 4 is a front view of a processing apparatus according to an embodiment of the present invention;
FIG. 5 is a side view of a processing device according to an embodiment of the present invention;
FIG. 6 is a first perspective view of a dental plate body according to an embodiment of the present invention;
FIG. 7 is an enlarged view of section C of FIG. 6;
FIG. 8 is a second perspective view of a dental plate body according to an embodiment of the present invention;
reference numerals: 1. the screw comprises a head, 2 parts of a screw rod, 21 parts of parallel thread parts, 22 parts of guide thread parts, 23 parts of thread teeth, 231 parts of tooth tips, 232 parts of tooth bottoms, 233 parts of turning starting tooth tips, 24 parts of connecting parts, 241 parts of connecting sections, 242 parts of transition sections, 3 parts of a tooth plate body, 31 parts of movable tooth plates, 32 parts of static tooth plates, 33 parts of thread grooves, 34 parts of feeding areas, 35 parts of shaping thread areas, 36 parts of discharging areas, 37 parts of anti-skid threads, 38 parts of shaping thread patterns and 39 parts of turning tail thread patterns.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Referring to fig. 1 to 8, the self-tapping screw for quick mounting on plastic parts disclosed in the present embodiment includes a head portion 1 and a screw shank portion 2, the screw shank portion 2 includes a parallel thread portion 21 and a guide thread portion 22, the parallel thread portion 21 is formed with a thread 23 having a uniform thread height from the head portion 1 to the guide thread portion 22, the guide thread portion 22 is formed with a thread 23 having a gradually decreasing thread height from the parallel thread portion 21 to a rear end of the screw shank portion 2, the thread 23 includes a crest 231 and a root 232, a pitch of the thread 23 is 2.69mm, a length of the guide thread portion 22 is 2 to 2.5 pitches, an angle between a tangent to the crest 231 of the guide thread portion 22 and a tangent to the crest 231 of the parallel thread portion 21 is 8 to 10 °, and the self-tapping screw is subjected to a heat treatment before plating, has a hardness of 340 to 370HV, and a maximum surface hardness of more than 390.
The embodiment further provides that: the parallel thread part 21 and the guide thread part 22 have a profile angle of 30 to 35 degrees, a width of the cusp 231 is 0.1 to 0.18mm, and a top of the cusp 231 is arc-shaped.
The embodiment further provides that: the screw rod part 2 further comprises a connecting part 24 connected with adjacent screw threads 23, the connecting part 24 comprises connecting sections 241 respectively connected with the adjacent screw threads 23 at two ends and transition sections 242 arranged between the connecting sections 241 at two ends, a fillet R1 is arranged between the root 232 and the transition section 242 of the screw rod part 2, R1 is not less than 0.1mm and not more than 0.15mm, the included angle between the connecting sections 241 at two ends is 140 degrees +/-3 degrees, and the length of the transition section 242 is 0.2 +/-0.1 mm.
The embodiment further provides that: the turning start crest 233 of the thread 23 has a circular arc shape.
The utility model provides a quick processingequipment who installs self tapping type screw at working of plastics, includes dental lamina body 3, dental lamina body 3 is including moving dental lamina 31 and quiet dental lamina 32, quiet dental lamina 32 all is provided with the thread groove 33 of invariable helix angle with moving dental lamina 31, and thread groove 33 forms cusp 231 and tooth bottom 232 in the sectional view, and cusp 231 holds two line intersection and forms a 30 ~ 35 contained angle, and cusp 231 is wide for 0.1 ~ 0.18mm, and cusp 231 top is circular-arcly.
The embodiment further provides that: move dental lamina 31 and quiet dental lamina 32 and all be equipped with pan feeding district 34, plastic screw thread district 35 and ejection of compact district 36 in proper order, move all be equipped with anti-skidding line 37, plastic profile 38 and turn to afterbody profile 39 on dental lamina 31 and the quiet dental lamina 32, anti-skidding line 37 sets up in pan feeding district 34, plastic profile 38 sets up in plastic screw thread district 35 and ejection of compact district 36, it sets up in 3 bottom tails departments of dental lamina body to turn to afterbody profile 39, anti-skidding line 37's height is increased gradually to high with plastic profile 38 height from pan feeding district 34 to plastic screw thread district 35, plastic profile 38 is parallel screw thread.
The embodiment further provides that: the total length of the tooth plate body 3 is h, the length of the feeding area 34 is h1, the length of h1 is more than or equal to 0.3h and less than or equal to 0.33h, the length of the shaping thread area 35 is h2, and the length of h2 is more than or equal to 0.5h and less than or equal to 0.6 h.
The embodiment further provides that: the total length of the movable tooth plate 31 is 165mm, and the total length of the static tooth plate 32 is 150 mm.
The embodiment further provides that: when the static tooth plate 32 and the movable tooth plate 31 are opposite in parallel, the tail part forms an included angle of 8-10 degrees.
The embodiment further provides that: the edge of the dental plate body 3 is provided with an arc chamfer.
The above-mentioned "between" does not only mean between the orientation and the position, but also means between the interaction of different components, and the above-mentioned "upper end", "middle end" and "lower end" are also relative positions, so as to facilitate the description, and do not exclude the possibility of using other terms.
Although used more herein: the term of the head 1, the screw shank 2, the parallel thread portion 21, the guide thread portion 22, the thread ridge 23, the tooth tip 231, the tooth root 232, the turning starting tooth tip 233, the connecting portion 24, the connecting portion 241, the transition portion 242, the dental plate body 3, the movable dental plate 31, the static dental plate 32, the thread groove 33, the feeding region 34, the shaping thread region 35, the discharging region 36, the anti-slip thread 37, the shaping thread 38, the turning tail thread 39, etc., does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The utility model provides a install self tapping type screw at working of plastics fast, includes head and screw pole portion, its characterized in that: the screw rod part comprises a parallel thread part and a guide thread part, a thread ridge with consistent thread height is formed on the parallel thread part from the head part to the guide thread part, a thread ridge with gradually reduced thread height is formed on the guide thread part from the parallel thread part to the tail end of the screw rod part, the thread ridge comprises a tooth tip and a tooth bottom, the thread pitch of the thread ridge is 2.69mm, the length of the guide thread part is 2-2.5 thread pitches, the included angle between the tangent of the tooth tip of the guide thread part and the tangent of the tooth tip of the parallel thread part is 8-10 degrees, the self-tapping screw is subjected to quenching and tempering heat treatment before electroplating, the hardness of the self-tapping screw is 340-370 HV, and the highest.
2. A self-tapping screw for quick attachment to a plastic part as in claim 1, wherein: the tooth form angles of the parallel thread part and the guide thread part are both 30-35 degrees, the width of the cusp is 0.1-0.18 mm, and the top of the cusp is arc-shaped.
3. A self-tapping screw for quick attachment to a plastic part as in claim 1, wherein: the screw rod part is still including connecting the connecting portion of adjacent screw thread, connecting portion include respectively with the linkage segment that adjacent both ends screw thread links to each other and set up the changeover portion between the linkage segment of both ends, be provided with radius angle R1 between the root of a tooth and the screw rod part changeover portion, 0.1mm is not less than R1 is not less than 0.15mm, and the contained angle between the linkage segment of both ends is 140 +/-3, and the length of changeover portion is 0.2 +/-0.1 mm.
4. A self-tapping screw for quick attachment to a plastic part as in claim 1, wherein: the turning starting tooth tip of the thread tooth is in a circular arc shape.
5. A machine for forming a self-tapping screw for quick attachment to a plastic part according to claim 1, wherein: including the dental lamina body, the dental lamina body is including moving dental lamina and quiet dental lamina, quiet dental lamina all is provided with the profile of tooth groove of invariable helix angle with moving the dental lamina, and the profile of tooth groove forms cusp and tooth bottom in the sectional view, and cusp both lines alternately form a 30 ~ 35 contained angle, and the cusp width is 0.1 ~ 0.18mm, and the cusp top is circular-arcly.
6. A self-tapping screw machine for quick attachment to a plastic part as claimed in claim 5, wherein: move the dental lamina and quiet dental lamina and all be equipped with pan feeding district, plastic screw thread district and ejection of compact district in proper order, move all be equipped with anti-skidding line, plastic profile on dental lamina and the quiet dental lamina and turn to afterbody profile, anti-skidding line sets up in the pan feeding district, the plastic profile sets up in plastic screw thread district and ejection of compact district, it sets up in dental lamina body bottom afterbody department to turn to the afterbody profile, the height of anti-skidding line is increased gradually to high together with plastic profile height from pan feeding district to plastic screw thread district, the plastic profile is parallel screw thread.
7. A self-tapping screw machine for quick attachment to a plastic part as claimed in claim 5, wherein: the total length of the tooth plate body is h, the length of the feeding area is h1, the length of the h1 is more than or equal to 0.3h and less than or equal to 0.33h, the length of the shaping thread area is h2, and the length of the h2 is more than or equal to 0.5h and less than or equal to 0.6 h.
8. A self-tapping screw machine for quick attachment to a plastic part as claimed in claim 7, wherein: the total length of the movable tooth plate is 165mm, and the total length of the static tooth plate is 150 mm.
9. A self-tapping screw machine for quick attachment to a plastic part as claimed in claim 5, wherein: when the static tooth plate and the movable tooth plate are arranged oppositely in parallel, the tail part forms an included angle of 8-10 degrees.
10. A self-tapping screw machine for quick attachment to a plastic part as claimed in claim 5, wherein: the edge of the dental plate body is provided with an arc chamfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716813.6A CN111853020A (en) | 2020-07-23 | 2020-07-23 | Self-tapping screw quickly installed on plastic part and machining device of self-tapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716813.6A CN111853020A (en) | 2020-07-23 | 2020-07-23 | Self-tapping screw quickly installed on plastic part and machining device of self-tapping screw |
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| Publication Number | Publication Date |
|---|---|
| CN111853020A true CN111853020A (en) | 2020-10-30 |
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|---|---|---|---|
| CN202010716813.6A Pending CN111853020A (en) | 2020-07-23 | 2020-07-23 | Self-tapping screw quickly installed on plastic part and machining device of self-tapping screw |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN208764078U (en) * | 2018-07-05 | 2019-04-19 | 常州星宇车灯股份有限公司 | A kind of tapping screw |
| CN209664205U (en) * | 2018-12-29 | 2019-11-22 | 苏州誉高紧固系统有限公司 | One kind being used for high-intensity fasteners annular knurl threading integral forming process dental lamina |
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| US4040328A (en) * | 1976-03-10 | 1977-08-09 | Research Engineering & Manufacturing, Inc. | Thread-forming fastener having dual lobulation and dies for making the same |
| DE20006482U1 (en) * | 2000-04-07 | 2000-06-29 | Fms Foerder Und Montage System | Self-tapping screw |
| CN201461668U (en) * | 2009-05-14 | 2010-05-12 | 孙如天 | Screw |
| 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 |
| CN105317807A (en) * | 2015-11-27 | 2016-02-10 | 宁波敏达机电有限公司 | Tapered thread bolt and processing tooth plate thereof |
| CN207239031U (en) * | 2017-06-27 | 2018-04-17 | 海盐精斌五金制品有限公司 | Automobile engine cover fixed screw precise forming mold |
| CN207154635U (en) * | 2017-07-26 | 2018-03-30 | 嘉兴弘邦金属制品有限公司 | A kind of dental lamina for being used to make flat head screw |
| CN208764078U (en) * | 2018-07-05 | 2019-04-19 | 常州星宇车灯股份有限公司 | A kind of tapping screw |
| CN209664205U (en) * | 2018-12-29 | 2019-11-22 | 苏州誉高紧固系统有限公司 | One kind being used for high-intensity fasteners annular knurl threading integral forming process dental lamina |
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