US20090017924A1 - Method of manufacturing a bi-metal screw - Google Patents

Method of manufacturing a bi-metal screw Download PDF

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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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United States
Prior art keywords
screw
welding
procedure
conical
drilling portion
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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
Application number
US11/778,916
Inventor
Yi-Lin Hsieh
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TOP WELL Tech CORP
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TOP WELL Tech CORP
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Assigned to TOP WELL TECH CORP reassignment TOP WELL TECH CORP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HSIEH, YI-LIN
Publication of US20090017924A1 publication Critical patent/US20090017924A1/en
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00Making helical bodies or bodies having parts of helical shape
    • B21H3/02Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/56Making machine elements screw-threaded elements
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49881Assembling 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

    BACKGROUND OF THE INVENTION
  • 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 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.
  • Continuing with the aforesaid, as referring to FIGS. 2 and 3, 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.
  • However, the conventional method of manufacturing still has some disadvantages:
  • 1. The Interspaces Generated Within the Joining of the Two Portions
  • By means of the flat surface 164 of the welding lug 165 compressed under pressure into the welding surface 152, 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.
  • 2. Reducing the Manufacturing Quality of the Screw
  • Due to that 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.
  • SUMMARY OF THE INVENTION
  • 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.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • 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.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • 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 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. 7, a shank portion 7 and a drilling portion 8 are respectively formed and made of different materials in the procedure of preparation 5; wherein, 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; furthermore, 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.
  • wherein a central axis “β” 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. Furthermore, 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 “β” and has a sharp angle “α” with the conical surface 82, which results in narrowing the tip of the conical surface 82.
  • Subsequently, 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. By means of the conical surface 82 formed in a rough state, 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. Simultaneously, 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.
  • Referring to FIGS. 8 and 9, during the above procedure of welding 52, 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 “α”, the amount of the scrap 61 would decrease and facilitate to increase the cutting efficiency. Further referring to FIG. 10, 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.
  • 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 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.
  • 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.
US11/778,916 2007-07-13 2007-07-17 Method of manufacturing a bi-metal screw Abandoned US20090017924A1 (en)

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TW096125483A TW200902861A (en) 2007-07-13 2007-07-13 Method for manufacturing screw of composite material
TW096125483 2007-07-13

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Cited By (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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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

STCB Information on status: application discontinuation

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