US20090017924A1 - Method of manufacturing a bi-metal screw - Google Patents
Method of manufacturing a bi-metal screw Download PDFInfo
- Publication number
- US20090017924A1 US20090017924A1 US11/778,916 US77891607A US2009017924A1 US 20090017924 A1 US20090017924 A1 US 20090017924A1 US 77891607 A US77891607 A US 77891607A US 2009017924 A1 US2009017924 A1 US 2009017924A1
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- US
- United States
- Prior art keywords
- screw
- welding
- procedure
- conical
- drilling portion
- 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.)
- Abandoned
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49881—Assembling or joining of separate helix [e.g., screw thread]
Definitions
- the present invention relates to a method of forming a screw, in particular a method of manufacturing a bi-metal screw which facilitates to lower the interspaces within the junction of two materials while operating, and to increase the quality of the formation.
- a conventional method of manufacturing a bi-metal screw 1 comprising a sequence of procedures, which include a procedure of preparation 11 , a procedure of welding 12 , a procedure of cutting 13 , and a procedure of formation 14 ; wherein, a shank portion 15 and a drilling portion 16 are arranged in the procedure of preparation 11 , which are respectively made of different materials; the shank portion 15 has a screw head 151 formed on one end thereof and a welding surface 152 disposed on the other end thereof; the drilling portion 16 has a drill tip 161 defined at the distal end thereof and an engaging face 162 opposite to the drill tip 161 ; Moreover, a sheet 163 is disposed on the engaging face 162 , and further a welding lug 165 with a flat surface 164 is projected from the sheet 163 , thereby welding the welding surface 152 to the welding lug 165 .
- the shank portion 15 is brought into contact with the drilling portion 16 by compressing both the welding surface 152 and welding lug 165 together; as referring to FIG. 4 , a composite screw 2 is thus formed. Subsequently, the scrap generated and exposed out of the junction of the two portions would be removed through the procedure of cutting 13 , further as shown in FIG. 5 , a plurality of screw threads 21 are formed by a thread-rolling machine, thus a bi-metal screw 3 is finished.
- the shank portion 15 and the drilling portion 16 can be combined into a composite screw 2 ; however, the air can not be fully smoothed away while welding, the interspaces hence is accumulated within the interface of the two portions, which affects the welding capability.
- both the welding surface 152 and the flat surface 164 are formed as a planar surface and butt welded, the shank portion 15 may not be precisely joined to the drilling portion 16 , whereas causing the composite screw 2 to be slanted aside during the welding process and influencing the quality of the formation.
- the objects of the present invention are to provide a method of manufacturing a bi-metal screw which facilitates to decrease the interspaces accumulated inside the junction of the two materials while welding, and to increase the quality of the screw formation.
- the method of forming a bi-metal screw in accordance with the present invention comprises in sequence a procedure of preparation, a procedure of welding, a procedure of cutting, and a procedure of formation; wherein, a shank portion and a drilling portion are arranged of different materials in the preparing process; the shank portion has a planar welding surface for connecting to a conical section of the drilling portion.
- the drilling portion can be gradually and precisely welded into the shank portion, so as to improve the problem of being slanted aside and decrease the interspaces generated in the junction of the two portions, thereby increasing the quality of the screw formation.
- FIG. 1 is a flow diagram for showing a conventional method of manufacturing a bi-metal screw
- FIGS. 2-5 show how the drilling portion welds to the shank portion and show the formation of the bi-metal in the conventional method of manufacturing a bi-metal screw;
- FIG. 6 is a flow diagram for showing the first preferred embodiment of the present invention.
- FIG. 7 is a schematic view for showing the configurations of the shank portion and the drilling portion of the present invention.
- FIGS. 8-10 show how the shank portion and the drilling portion are welded together and show the formation of the bi-metal in the method of manufacturing a bi-metal screw of the present invention.
- FIG. 11 shows the method of manufacturing a bi-metal screw of the second preferred embodiment of the present invention.
- the first preferred embodiment of a method of manufacturing a bi-metal screw 5 comprises a procedure of preparation 51 , a procedure of welding 52 , a procedure of cutting 53 , and a procedure of formation 54 . Further referring to FIG. 6 , the first preferred embodiment of a method of manufacturing a bi-metal screw 5 comprises a procedure of preparation 51 , a procedure of welding 52 , a procedure of cutting 53 , and a procedure of formation 54 . Further referring to FIG.
- the shank portion 7 is made of a kind of metal, for instance of a stainless steel, which comprises a screw head 71 formed on one side thereof and a planar welding surface 72 disposed on the other side thereof;
- the drilling portion 8 is made of another kind of metal, for instance of a low-carbon steel, which is susceptible of carburizing-and-quenching, so as to promote the volume of the carbon up to 35% for increasing the hardness of the outer surface of the drilling portion 8 .
- a central axis “ ⁇ ” is longitudinally defined from a center of the drilling portion 8 , which has a conical section 81 defined thereon.
- the conical section 81 consists of a conical surface 82 defined at the top face thereof and a bottom surface 83 defined opposite to the conical surface 82 .
- an outer diameter “D” of the conical section 81 is greater than a shank diameter “d” of the drilling portion 8 , and the conical surface 82 is formed in a rough state.
- the bottom surface 83 intersects to an outmost tip of the conical surface 82 , thereby inwardly extending toward the direction of the drilling portion 8 and engaging thereto; the bottom surface 83 can be perpendicular or inclined to the central axis “ ⁇ ” and has a sharp angle “ ⁇ ” with the conical surface 82 , which results in narrowing the tip of the conical surface 82 .
- the procedure of welding 52 is proceeding to weld the conical section 81 of the drilling portion 8 to the planar welding surface 72 of the shank portion 7 .
- the drilling portion 8 can be precisely and gradually welded to the shank portion 7 , thereby decreasing the interspaces generated and accumulated inside the junction of the two portions.
- the conical section 81 of the drilling portion 8 is dissolved through the heat of welding into the shank portion and is precisely adhering thereto; therefore, a composite screw 6 is formed as illustrated in FIG. 8 .
- a scrap 61 is generated and exposed out of the junction of the shank portion 7 and the drilling portion 8 , therefore the procedure of cutting 53 is proceeding for chipping and removing the scrap 61 out of the composite screw 6 . Due to the configuration of the sharp angle “ ⁇ ”, the amount of the scrap 61 would decrease and facilitate to increase the cutting efficiency.
- a plurality of screw threads 63 are formed by a thread-rolling machine along the composite screw 6 , and a drill tip 62 is also molded at the distal end thereof by some relative apparatuses, whereby an integral bi-metal screw 9 is finished. Illustrations of the above apparatuses are accordingly omitted. Substantively, for practical purpose, the bi-metal screw 9 can be adjusted again through the relative processes of the heat treatment based on the client's requirement. Let the bi-metal screw 9 to meet the actual use demand.
- the second preferred embodiment of the present invention comprising the same elements as described in the first preferred embodiment.
- the drill tip 88 of the drilling portion 8 is formed in the preliminary procedure of preparation 51 , and a scrap stock 881 is disposed around the outer circumference of said drill tip 88 , thereby preventing from abrading the sharpness of a cutting edge 882 of the drill tip 88 while welding.
- the scrap stock 881 would be removed until the last procedure of formation. In this manner, the cutting capability of the drill tip 8 would hence be increased.
- the present invention takes advantage of configuration of the shank portion and the drilling portion.
- the shank portion has a planar welding surface defined thereon, and a conical section is disposed on the drilling portion.
- the conical section can be gradually dissolved through the heat of welding into the shank portion, so as to decrease the interspaces accumulated in the junction of the two portions, improve the problem of being slanted aside, and increase the quality of the screw formation.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Powder Metallurgy (AREA)
- Forging (AREA)
Abstract
The present invention pertains to a method of manufacturing a bi-metal screw comprising a sequence of procedures; wherein, the process preparation is for arranging a shank portion and a drilling portion made of different materials; the shank portion has a planar welding surface defined thereon; in particular, the drilling portion includes a conical section with a conical surface defined on the top face thereof. While operating, the conical section is gradually welded to the planar welding surface to form a composite screw, so as to smooth the air away for preventing the interspaces generated within the junction of the two portions and rendering the composite screw not to be slanted aside. Subsequently, an integral bi-metal screw is formed through the processes of precisely cutting and formation, thereby increasing the quality of the screw.
Description
- 1. Field of the Invention
- The present invention relates to a method of forming a screw, in particular a method of manufacturing a bi-metal screw which facilitates to lower the interspaces within the junction of two materials while operating, and to increase the quality of the formation.
- 2. Description of the Related Art
- Referring to
FIGS. 1 and 2 , a conventional method of manufacturing a bi-metal screw 1 comprising a sequence of procedures, which include a procedure ofpreparation 11, a procedure of welding 12, a procedure of cutting 13, and a procedure offormation 14; wherein, ashank portion 15 and adrilling portion 16 are arranged in the procedure ofpreparation 11, which are respectively made of different materials; theshank portion 15 has ascrew head 151 formed on one end thereof and awelding surface 152 disposed on the other end thereof; thedrilling portion 16 has adrill tip 161 defined at the distal end thereof and anengaging face 162 opposite to thedrill tip 161; Moreover, asheet 163 is disposed on theengaging face 162, and further awelding lug 165 with aflat surface 164 is projected from thesheet 163, thereby welding thewelding surface 152 to thewelding lug 165. - Continuing with the aforesaid, as referring to
FIGS. 2 and 3 , theshank portion 15 is brought into contact with thedrilling portion 16 by compressing both thewelding surface 152 andwelding lug 165 together; as referring toFIG. 4 , acomposite screw 2 is thus formed. Subsequently, the scrap generated and exposed out of the junction of the two portions would be removed through the procedure ofcutting 13, further as shown inFIG. 5 , a plurality ofscrew threads 21 are formed by a thread-rolling machine, thus abi-metal screw 3 is finished. - However, the conventional method of manufacturing still has some disadvantages:
- By means of the
flat surface 164 of thewelding lug 165 compressed under pressure into thewelding surface 152, theshank portion 15 and thedrilling portion 16 can be combined into acomposite screw 2; however, the air can not be fully smoothed away while welding, the interspaces hence is accumulated within the interface of the two portions, which affects the welding capability. - Due to that both the
welding surface 152 and theflat surface 164 are formed as a planar surface and butt welded, theshank portion 15 may not be precisely joined to thedrilling portion 16, whereas causing thecomposite screw 2 to be slanted aside during the welding process and influencing the quality of the formation. - The objects of the present invention are to provide a method of manufacturing a bi-metal screw which facilitates to decrease the interspaces accumulated inside the junction of the two materials while welding, and to increase the quality of the screw formation.
- The method of forming a bi-metal screw in accordance with the present invention comprises in sequence a procedure of preparation, a procedure of welding, a procedure of cutting, and a procedure of formation; wherein, a shank portion and a drilling portion are arranged of different materials in the preparing process; the shank portion has a planar welding surface for connecting to a conical section of the drilling portion. By means of the conical section, the drilling portion can be gradually and precisely welded into the shank portion, so as to improve the problem of being slanted aside and decrease the interspaces generated in the junction of the two portions, thereby increasing the quality of the screw formation.
- The advantages of the present invention over the known prior art will become more apparent to those of ordinary skilled in the art upon reading the following descriptions in junction with the accompanying drawings.
-
FIG. 1 is a flow diagram for showing a conventional method of manufacturing a bi-metal screw; -
FIGS. 2-5 show how the drilling portion welds to the shank portion and show the formation of the bi-metal in the conventional method of manufacturing a bi-metal screw; -
FIG. 6 is a flow diagram for showing the first preferred embodiment of the present invention; -
FIG. 7 is a schematic view for showing the configurations of the shank portion and the drilling portion of the present invention; -
FIGS. 8-10 show how the shank portion and the drilling portion are welded together and show the formation of the bi-metal in the method of manufacturing a bi-metal screw of the present invention; and -
FIG. 11 shows the method of manufacturing a bi-metal screw of the second preferred embodiment of the present invention. - Before the present invention is described in greater detail, it should be noted that the like elements are denoted by the same reference numerals throughout the disclosure.
- Referring to
FIG. 6 , the first preferred embodiment of a method of manufacturing abi-metal screw 5 comprises a procedure ofpreparation 51, a procedure of welding 52, a procedure ofcutting 53, and a procedure offormation 54. Further referring toFIG. 7 , ashank portion 7 and adrilling portion 8 are respectively formed and made of different materials in the procedure ofpreparation 5; wherein, theshank portion 7 is made of a kind of metal, for instance of a stainless steel, which comprises ascrew head 71 formed on one side thereof and aplanar welding surface 72 disposed on the other side thereof; furthermore, thedrilling portion 8 is made of another kind of metal, for instance of a low-carbon steel, which is susceptible of carburizing-and-quenching, so as to promote the volume of the carbon up to 35% for increasing the hardness of the outer surface of thedrilling portion 8. - wherein a central axis “β” is longitudinally defined from a center of the
drilling portion 8, which has aconical section 81 defined thereon. Theconical section 81 consists of aconical surface 82 defined at the top face thereof and abottom surface 83 defined opposite to theconical surface 82. Furthermore, an outer diameter “D” of theconical section 81 is greater than a shank diameter “d” of thedrilling portion 8, and theconical surface 82 is formed in a rough state. Thebottom surface 83 intersects to an outmost tip of theconical surface 82, thereby inwardly extending toward the direction of thedrilling portion 8 and engaging thereto; thebottom surface 83 can be perpendicular or inclined to the central axis “β” and has a sharp angle “α” with theconical surface 82, which results in narrowing the tip of theconical surface 82. - Subsequently, the procedure of welding 52 is proceeding to weld the
conical section 81 of thedrilling portion 8 to theplanar welding surface 72 of theshank portion 7. By means of theconical surface 82 formed in a rough state, thedrilling portion 8 can be precisely and gradually welded to theshank portion 7, thereby decreasing the interspaces generated and accumulated inside the junction of the two portions. Simultaneously, theconical section 81 of thedrilling portion 8 is dissolved through the heat of welding into the shank portion and is precisely adhering thereto; therefore, acomposite screw 6 is formed as illustrated inFIG. 8 . - Referring to
FIGS. 8 and 9 , during the above procedure of welding 52, ascrap 61 is generated and exposed out of the junction of theshank portion 7 and thedrilling portion 8, therefore the procedure ofcutting 53 is proceeding for chipping and removing thescrap 61 out of thecomposite screw 6. Due to the configuration of the sharp angle “α”, the amount of thescrap 61 would decrease and facilitate to increase the cutting efficiency. Further referring toFIG. 10 , a plurality of screw threads 63 are formed by a thread-rolling machine along thecomposite screw 6, and a drill tip 62 is also molded at the distal end thereof by some relative apparatuses, whereby anintegral bi-metal screw 9 is finished. Illustrations of the above apparatuses are accordingly omitted. Substantively, for practical purpose, thebi-metal screw 9 can be adjusted again through the relative processes of the heat treatment based on the client's requirement. Let thebi-metal screw 9 to meet the actual use demand. - Referring to
FIG. 11 , the second preferred embodiment of the present invention comprising the same elements as described in the first preferred embodiment. Particularly, the drill tip 88 of thedrilling portion 8 is formed in the preliminary procedure ofpreparation 51, and a scrap stock 881 is disposed around the outer circumference of said drill tip 88, thereby preventing from abrading the sharpness of a cutting edge 882 of the drill tip 88 while welding. The scrap stock 881 would be removed until the last procedure of formation. In this manner, the cutting capability of thedrill tip 8 would hence be increased. - To sum up, the present invention takes advantage of configuration of the shank portion and the drilling portion. Particularly, the shank portion has a planar welding surface defined thereon, and a conical section is disposed on the drilling portion. By compressing the planar welding surface and the conical section together, the conical section can be gradually dissolved through the heat of welding into the shank portion, so as to decrease the interspaces accumulated in the junction of the two portions, improve the problem of being slanted aside, and increase the quality of the screw formation.
- While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
Claims (4)
1. A method of manufacturing a bi-metal screw comprising the steps of:
a procedure of preparation for arranging a shank portion and a drilling portion, which are respectively made of different materials; wherein, said shank portion consists of a screw head disposed on one end thereof and a planar welding surface formed on the other end thereof; a central axis is longitudinally defined from a center of said drilling portion, which has a conical section disposed thereon; said conical section has an outer diameter greater than a shank diameter of said drilling portion; wherein, said conical section includes a conical surface defined at the top face thereof and a bottom surface defined opposite to said conical surface; said bottom surface intersects to an outmost tip of said conical surface, thereby inwardly extending toward the direction of said drilling portion and engaging thereto;
a procedure of welding for welding said planar welding surface of said shank portion to said conical section of said drilling portion; a composite screw is formed by welding;
a procedure of cutting to chip and remove a scrap generated out of the junction of said planar welding surface and said conical section;
a procedure of formation for molding a drill tip at the distal end of said drilling portion and continuously rolling a plurality of screw threads on said composite screw, hence a bi-metal screw is accomplished.
2. A method of manufacturing a bi-metal screw comprising the steps of:
a procedure of preparation for arranging a shank portion and a drilling portion, which are respectively made of different materials; wherein, said shank portion consists of a screw head disposed on one end thereof and a planar welding surface formed on the other end thereof; a central axis is longitudinally defined from a center of said drilling portion, which includes a conical section disposed on one end thereof and a drill tip formed on the other end thereof; a scrap stock is disposed around the outer circumference of said drill tip; said conical section has an outer diameter greater than a shank diameter of said drilling portion; wherein, said conical section includes a conical surface defined at the top face thereof and a bottom surface defined opposite to said conical surface; said bottom surface intersects to an outmost tip of said conical surface, thereby inwardly extending toward the direction of said drilling portion and engaging thereto;
a procedure of welding for welding said planar welding surface of said shank portion to said conical section of said drilling portion; a composite screw is formed by welding;
a procedure of cutting to chip and remove a scrap generated out of the junction of said planar welding surface and said conical section;
a procedure of formation for continuously rolling a plurality of screw threads on said composite screw and removing said scrap stock disposed around said drill tip, hence said bi-metal screw is accomplished.
3. A method of manufacturing a bi-metal screw as claimed in claim 1 or 2 , wherein said bottom surface is inclined to said central axis and has a sharp angle with said conical surface.
4. A method of manufacturing a bi-metal screw as claimed in claim 1 or 2 , wherein said conical surface is formed in a rough state.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW096125483A TW200902861A (en) | 2007-07-13 | 2007-07-13 | Method for manufacturing screw of composite material |
TW096125483 | 2007-07-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090017924A1 true US20090017924A1 (en) | 2009-01-15 |
Family
ID=40253614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/778,916 Abandoned US20090017924A1 (en) | 2007-07-13 | 2007-07-17 | Method of manufacturing a bi-metal screw |
Country Status (2)
Country | Link |
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US (1) | US20090017924A1 (en) |
TW (1) | TW200902861A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012040606A (en) * | 2010-08-23 | 2012-03-01 | Nsk Ltd | Method of manufacturing screw shaft and screw shaft for electric power steering |
JP2017020569A (en) * | 2015-07-10 | 2017-01-26 | 平田ネジ株式会社 | Blank manufacturing system and method for bimetal screw |
EP3267052A1 (en) * | 2016-07-08 | 2018-01-10 | HILTI Aktiengesellschaft | Screw and method for its production |
US11498159B2 (en) | 2018-12-28 | 2022-11-15 | Taiwan Shan Yin International Co., Ltd. | Welding mechanism for manufacturing a bi-compositional screw |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US910434A (en) * | 1907-06-11 | 1909-01-19 | Electric Welding Products Company | Method of electric welding. |
US2153702A (en) * | 1935-05-22 | 1939-04-11 | Rustless Iron And Steel Corp O | Fastening device |
US3924508A (en) * | 1974-09-27 | 1975-12-09 | Textron Inc | Composite drill screw |
US4257307A (en) * | 1977-01-19 | 1981-03-24 | Sfs Stadler Ag | Hole-drilling self-tapping screw |
US4736481A (en) * | 1987-05-22 | 1988-04-12 | Construction Fasteners, Inc. | Method of manufacturing screw fasteners |
US4958972A (en) * | 1988-11-25 | 1990-09-25 | Yugen Kaisha Shinjoseisakusho | Breakable composite drill screw |
-
2007
- 2007-07-13 TW TW096125483A patent/TW200902861A/en not_active IP Right Cessation
- 2007-07-17 US US11/778,916 patent/US20090017924A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US910434A (en) * | 1907-06-11 | 1909-01-19 | Electric Welding Products Company | Method of electric welding. |
US2153702A (en) * | 1935-05-22 | 1939-04-11 | Rustless Iron And Steel Corp O | Fastening device |
US3924508A (en) * | 1974-09-27 | 1975-12-09 | Textron Inc | Composite drill screw |
US4257307A (en) * | 1977-01-19 | 1981-03-24 | Sfs Stadler Ag | Hole-drilling self-tapping screw |
US4736481A (en) * | 1987-05-22 | 1988-04-12 | Construction Fasteners, Inc. | Method of manufacturing screw fasteners |
US4958972A (en) * | 1988-11-25 | 1990-09-25 | Yugen Kaisha Shinjoseisakusho | Breakable composite drill screw |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012040606A (en) * | 2010-08-23 | 2012-03-01 | Nsk Ltd | Method of manufacturing screw shaft and screw shaft for electric power steering |
JP2017020569A (en) * | 2015-07-10 | 2017-01-26 | 平田ネジ株式会社 | Blank manufacturing system and method for bimetal screw |
EP3267052A1 (en) * | 2016-07-08 | 2018-01-10 | HILTI Aktiengesellschaft | Screw and method for its production |
WO2018007195A1 (en) * | 2016-07-08 | 2018-01-11 | Hilti Aktiengesellschaft | Screw, and production method |
CN109312771A (en) * | 2016-07-08 | 2019-02-05 | 喜利得股份公司 | Screw and manufacturing method |
US11498159B2 (en) | 2018-12-28 | 2022-11-15 | Taiwan Shan Yin International Co., Ltd. | Welding mechanism for manufacturing a bi-compositional screw |
Also Published As
Publication number | Publication date |
---|---|
TWI318269B (en) | 2009-12-11 |
TW200902861A (en) | 2009-01-16 |
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Owner name: TOP WELL TECH CORP, VIRGIN ISLANDS, BRITISH Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HSIEH, YI-LIN;REEL/FRAME:019610/0881 Effective date: 20070712 |
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