TWI458573B - Headless threaded fastener manufacturing method and a headless threaded fastener member produced thereby - Google Patents

Description

Headless thread fastener manufacturing method and headless thread fastener component thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of manufacturing a headless threaded fastener and a headless threaded fastener component thereof, and more particularly to the use of a headless thread for forming a trailing end point in a thread-rolling process. A method of manufacturing a fastener element and a headless threaded fastener component.

A conventional method for manufacturing a headless thread fastener, as shown in Figs. 1A to 1D, comprises the steps of: first, in a first step, a metal wire or a metal bar is formed into a long column member 10. The long post 10 has a first end 10a and a second end 10b. The first end 10a of the long column member 10 is formed into a groove portion 11, such as a groove portion, a square groove, a hexagon socket, a hexagonal groove, a groove or a m-shaped groove. As shown in Figure 1A. The groove portion 11 is for chucking one end of a screwdriver (not shown) to rotate the long column member 10 with the screwdriver.

Referring to FIG. 1B, next, in the second step, the second end 10b [the other end] of the long column member 10 needs to be selected to form a reserved end portion, which is used in use. With a spiral against a surface. Thus, the tail portion of the second end 10b corresponds to the groove groove portion 11 of the first end 10a.

Referring to FIG. 1C, next, in the third step, the second end 10b of the long column member 10 is identified in an appropriate manner, and a screw tail point [point] 12 is formed to form a headless thread. A headless threaded fastener blank 10' and forming a predetermined length of the headless threaded fastener 10'. At this time, the outer surface of the headless threaded fastener 10' is a smooth surface, i.e., no thread is formed between the first end 10a and the second end 10b of the headless threaded fastener 10'.

Referring to FIG. 1D, in the fourth step, a thread 13 is formed on the headless threaded fastener 10' by a thread-rolling manner, and the headless threaded fastener is The second end 10b of the piece 10' is repaired to form a cone point or an oval point to form a finished product without a threaded fastener. At this time, the thread 13 is formed between the first end 10a and the second end 10b of the headless threaded fastener 10'.

However, in the second step, especially if a square groove, a hexagonal groove, and a recessed hexagonal groove are formed on the first end 10a of the long column member 10, the first of the long column members 10 may be erroneously selected. The end 10a is reserved to form a tail portion, so that the first end 10a of the long column member 10 is erroneously used in the third step to form a shape like the screw tail portion 12, which may cause erroneous recognition to select the long column member 10. First end 10a. Therefore, the groove portion 11 and the shape of the screw tail portion 12 are simultaneously formed on the first end 10a of the long column member 10, and instead, no snail is formed on the second end 10b of the long column member 10. Tail point.

In short, in the second and third steps, it is necessary to further improve the manufacturing method of forming the screw tail point, so as to improve the disadvantage that the above process is prone to the selection of the wrong end [or the inability to identify the correct end]. In other words, the conventional method of manufacturing headless thread fasteners necessarily has the potential need to provide a process method that is more suitable for mass production.

In view of the above, the present invention provides a method for manufacturing a headless thread fastener and a headless thread fastener component thereof, which are formed by forming a tail end point in a thread rolling process to achieve the above requirements. Reduce the purpose of identifying errors.

The main object of the present invention is to provide a method for manufacturing a headless thread fastener and a headless thread fastener component thereof, which are used to form a tail end point in a thread rolling process to reduce the occurrence of identification errors. .

In order to achieve the above object, a method for manufacturing a headless thread fastener according to a preferred embodiment of the present invention comprises: forming a metal wire or a metal bar into a long column member, and the long column member has a first end and a second The first end of the long column member is groove-formed to form a groove portion; the second end of the long column member is screwed and the end of the end is formed to form a thread and a screw The tail point portion, or the thread is also selected to be formed on the long column member to form a finished product without a threaded fastener.

A method for manufacturing a headless thread fastener according to another preferred embodiment of the present invention comprises: forming a metal wire or a metal rod into a long column member, and the long column member has a first end and a second end; The first end of the long column member is groove-formed to form a groove portion; the second end of the long column member is formed into a reserved end portion to form a reserved end processing portion; The second end of the piece is threaded and end-end formed to form a thread and a threaded tail portion to form a finished product without a threaded fastener.

The headless threaded fastener of the preferred embodiment of the present invention is formed of a metal wire or a metal rod and has a long column member, and the long column member has a first end and a second end, and the long column member is made. The finished product of the headless threaded fastener comprises: a groove portion, a thread and a screw tail portion, wherein the groove portion is first formed on the first end of the long column member, and When the tooth is rolled and formed into the thread, the screw tail portion is formed at the second end of the long column member.

In another preferred embodiment of the present invention, the headless threaded fastener is formed of a metal wire or a metal rod, and the long column member has a first end and a second end. The finished product of the headless threaded fastener comprises: a groove portion, a thread and a screw tail portion, wherein the groove portion is first formed on the first end of the long column member, When the thread is rolled and formed, the screw tail portion is formed at the second end of the long column member, and the screw tail portion is formed from a reserved end processing portion.

In the preferred embodiment of the present invention, the groove portion comprises a slot, a cross slot, a square slot, a hexagon socket, a recessed hexagonal slot, a slotted/square slot, a slot/cross slot, a slot and a meter Word slot.

In the preferred embodiment of the invention, the screw tail portion includes a chamfer point, a cone point, a Jimley characteristic, a head point, a nail point, a needle point, an elliptical point, a test point, a pinch point, and a spherical point.

In the preferred embodiment of the present invention, the diameter of the reserved end processing portion is larger or smaller than the diameter of the long column member.

In order to fully understand the present invention, the preferred embodiments of the present invention are described in detail below and are not intended to limit the invention.

The method for manufacturing a headless threaded fastener according to a preferred embodiment of the present invention and the headless threaded fastener component are suitable for producing various fasteners, for example, comprising: studs, double-headed studs or Other special fasteners, but are not intended to limit the scope of the invention.

The headless thread fastener component of the preferred embodiment of the present invention can be made of various metal or alloy materials, which is the same as other general fastener materials, and the method of manufacturing the headless thread fastener of the preferred embodiment of the present invention Applicable to special fastener materials or general fastener materials, the general fastener materials include low carbon steel, medium carbon steel, alloy steel, copper or stainless steel.

2A to 2B are schematic side views showing the manufacture of the headless thread fastener in the manufacturing process of the method for manufacturing the headless thread fastener according to the first preferred embodiment of the present invention. Referring to FIG. 2A, the method for manufacturing the headless thread fastener according to the first preferred embodiment of the present invention firstly forms a metal rod or a metal rod into a long column member 20. The long post 20 has a first end 20a and a second end 20b. The first end 20a of the long column member 20 is formed into a groove portion 21, for example, a groove portion, a square groove, a hexagonal groove, a recessed hexagon groove, a groove or a square groove, such as the 2A. The figure shows. The groove portion 21 is configured to chuck one end of a screwdriver (not shown) to rotate the long column member 20 with the screwdriver.

Referring to FIG. 2A again, for example, the groove portion 21 can be formed into a slotted type, a Phillips recess type, a square socket type, and a hexagonal slot [ Hexagon type], recessed hexagon type [indented hexagon type], slotted & square socket type, slotted & Phillips combination type, I-shaped slot [H type] and meter Word slot [PZ drive type] or the like, but it is not intended to limit the scope of the present invention.

Referring to FIG. 2A again, the second end 20b of the long post 20 is reserved to form an extended portion, so that the second end 20b can be easily processed, according to the headless thread buckle. The predetermined length [predetermined length] of the component is cut to remove the extension 20c. As such, the method for manufacturing the headless thread fastener of the present invention can adjust the total length of the headless thread fastener [total length] according to requirements, and can omit the subsequent vehicle repair molding tail end at the second end of the long column member 20. Process step 20b.

Referring to FIG. 2B, the method for manufacturing the headless thread fastener according to the first preferred embodiment of the present invention will be followed by a thread-rolling and point-forming manner. A thread 23 and a screw tail portion 22 are formed on the column member 20 to form a finished product 2 of the headless thread fastener. At this time, the thread 23 is formed between the first end 20a and the second end 20b of the long column member 20. The method for manufacturing the headless thread fastener according to the first preferred embodiment of the present invention does not require the processing steps of the tail end of the vehicle to be formed after the screw is rolled.

For example, in the preferred embodiment of the present invention, the self-tapping screw of the long column member 20 forms a single thread, a double thread, a high-low thread or a triangular tooth. Lobular thread] and the like, but it is not intended to limit the scope of the invention.

For example, in the preferred embodiment of the present invention, the screw tail portion 22 includes: a chamfer point, a cone point, a gimlet point, a head point, and a nail. Point [nail point], needle point, oval point, pilot point, pinch point, and spherical point, but it is not intended to limit the present invention. The scope.

3A to 3B are schematic side views showing the manufacture of the headless thread fastener in the manufacturing process of the method for manufacturing the headless thread fastener according to the second preferred embodiment of the present invention. Referring to FIG. 3A, the method for manufacturing the headless thread fastener according to the first preferred embodiment of the present invention firstly forms a metal rod or a metal rod into a long column member 20. The long post 20 has a first end 20a and a second end 20b. The first end 20a of the elongated post member 20 is formed as a groove portion 21, for example, a groove portion as shown in Fig. 3A. The groove portion 21 is configured to chuck one end of a screwdriver (not shown) to rotate the long column member 20 with the screwdriver.

Referring to FIG. 3A again, in the second preferred embodiment of the present invention, the second end 20b of the long column member 20 is formed into a reserved point-processing portion 200 by a molding machine. When the shapes of the one end 20a and the second end 20b are similar, the second end 20b is more easily distinguished from the first end 20a by the reserved end processing portion. In the second preferred embodiment of the present invention, the diameter of the reserved end processing portion 200 is larger than the diameter of the long column member 20. In contrast, in another preferred embodiment of the present invention, the diameter of the reserved end processing portion 200 is smaller than the diameter of the long column member 20 [not shown].

Referring to FIG. 3B, the method for manufacturing the headless thread fastener according to the second preferred embodiment of the present invention will be followed by a thread-rolling and point-forming manner. A screw 23 and a screw tail portion 22 are respectively formed on the column member 20 and the reserved end processing portion 200 to form a finished product 2 without a threaded fastener.

Further, the headless thread fastener of the preferred embodiment of the present invention may be made of a magnesium-based alloy. When the headless thread fastener of the present invention is selected from a magnesium or magnesium alloy material, the magnesium wire or the magnesium rod is subjected to heat preservation and direct heat treatment to directly heat the magnesium wire or the magnesium rod to a predetermined temperature. The magnesium wire or the magnesium rod is applied to the magnesium wire or the magnesium rod by using a thermal isolating material before being passed through a heater to prevent heat loss of the magnesium wire or the magnesium rod after heating. [heat loss] to the outside world.

According to another preferred embodiment of the present invention, the magnesium wire or the magnesium rod is directly heated and heat treated. The magnesium wire or the magnesium rod is sent to pass through a heater, and then coated on the magnesium wire or the magnesium rod with a heat insulating material to prevent heat loss of the magnesium wire or the magnesium rod to the outside after heating.

In the preferred embodiment of the invention, the insulating material is selected from an inorganic material or an organic material. For example, the inorganic material of the preferred embodiment of the invention is selected from the group consisting of graphite or boron nitride [BN], but it is not intended to limit the scope of the invention.

The foregoing preferred embodiments are merely illustrative of the invention and the technical features thereof, and the techniques of the embodiments can be carried out with various substantial equivalent modifications and/or alternatives; therefore, the scope of the invention is subject to the appended claims. The scope defined by the scope shall prevail.

1. . . Headless thread fasteners

10. . . Long column

10a. . . First end

10b. . . Second end

11. . . Groove

12. . . Spiral tail

2. . . Headless thread fasteners

20. . . Long column

20a. . . First end

20b. . . Second end

20c. . . Extension

twenty one. . . Groove

twenty two. . . Spiral tail

twenty three. . . Screw

200. . . Reserved end processing department

1A to 1D: A side view of a conventional method for manufacturing a headless thread fastener in a process step.

2A to 2B are schematic side views showing the manufacture of the headless thread fastener in the manufacturing process of the first preferred embodiment of the present invention.

3A to 3B are views showing a side view of a method for manufacturing a headless thread fastener according to a second preferred embodiment of the present invention in the manufacturing process.

2. . . Headless thread fasteners

twenty one. . . Groove

twenty two. . . Spiral tail

Claims (10)

A method for manufacturing a headless threaded fastener, comprising: forming a metal wire or a metal rod into a long column member, and the long column member has a first end and a second end, and the long column member is The two ends extend to form an extension portion to make a half finished product; the first end of the semi-finished long column member is groove-formed to form a groove portion; and the semi-finished long column member and the extension portion The thread rolling and the end point forming are performed in a single process to form a thread and a screw tail point to make a finished product of the headless thread fastener; if an error occurs, the first end of the long column member is selected. When the spiral tail portion is further formed on the groove portion, it is only necessary to select groove forming on the second end of the long column member to re-remediate the formation of the groove portion. A method for manufacturing a headless thread fastener, comprising: forming a metal wire or a metal rod into a long column member, wherein the long column member has a first end and a second end; One end is groove-formed to form a groove portion; the second end of the long column member is formed at a reserved end to form a reserved end processing portion to make a half finished product, and the reservation is made The diameter of the end processing portion is larger or smaller than the diameter of the long column member; and the long column member and the reserved end processing portion of the semi-finished product are screwed and end-end formed in a single process to form a thread and A screw tail point is made to make a finished product without a threaded fastener. The method for manufacturing a headless thread fastener according to claim 1 or 2, wherein the groove portion comprises a slot, a cross slot, a square slot, a hexagon socket, a recessed hexagon slot, a word/square Type groove, one word / cross groove, I-shaped groove and rice groove. The method for manufacturing a headless thread fastener according to claim 1 or 2, wherein the thread tail portion includes a chamfer point, a cone point, a Jimley characteristic, a head point, a nail point, a needle point, and an elliptical point. , test points, pinch points and spherical points. The method for manufacturing a headless thread fastener according to the second aspect of the invention, wherein the diameter of the reserved end processing portion is larger or smaller than the diameter of the long column member. A semi-finished product of a headless threaded fastener, wherein a long column member is made of a metal wire or a metal bar, and the long column member has a first end and a second end, and the long column piece is made into a half finished product. The method comprises: a groove portion formed on the first end of the long column member; and an extension portion extending from the second end of the long column member to form the semi-finished product; wherein the length is The column member and the extension portion are formed in a subsequent process: a thread formed on the long column member of the semi-finished product; and a screw tail portion which is formed in the long column of the semi-finished product when the tooth is rolled and formed Forming the screw tail portion at the second end, wherein the long column member and the extension portion of the semi-finished product are threaded and end-end formed in a single process; if an error occurs, the first end of the long column member is selected When the spiral tail portion is further formed on the groove portion, it is only necessary to select groove forming on the second end of the long column member to re-remediate the formation of the groove portion. A semi-finished product of a headless threaded fastener, made of a metal wire or a metal rod Forming a long column member, and the long column member has a first end and a second end, and the long column member is made into a semi-finished product, which comprises: a groove portion which is first formed on the long column member of the semi-finished product a first end; and a reserved end processing portion, which is reserved to be formed at the second end of the long column member to form the semi-finished product, and the diameter of the reserved end processing portion is larger or smaller than the long column member The diameter of the long column member and the reserved tail end processing portion are formed in a subsequent process: a thread is formed on the long column member of the semi-finished product; and a screw tail portion is formed when the tooth is rolled and formed. And processing the screw tail point portion in the reserved end processing part of the semi-finished long column piece, wherein the semi-finished long column piece and the reserved end end processing part are screwed and tailed in a single process End point molding. The semi-finished product of the headless threaded fastener according to claim 6 or 7, wherein the groove portion comprises a slot, a cross slot, a square groove, a hexagon socket, a hexagonal groove, a word/square Type groove, one word / cross groove, I-shaped groove and rice groove. The semi-finished product of the headless thread fastener according to claim 6 or 7, wherein the screw tail portion includes a chamfer point, a cone point, a Jimley characteristic, a head point, a nail point, a needle point, and an elliptical point. , test points, pinch points and spherical points. The semi-finished product of the headless threaded fastener according to claim 7, wherein the diameter of the reserved end processing portion is larger or smaller than the diameter of the long column member.