CN102847847A - Manufacturing method of self-drilling screw - Google Patents

Abstract

A method of manufacturing a drill tail screw includes a screw head forming step and a drill tail forming step. The screw head forming step uses a molding machine to form a head from a blank material, and the head is formed into a screw head. The drill tail forming step forms a drill tail on the same forming machine. The invention can simplify the manufacturing process of drill tail screws to achieve higher output, and can also reduce manufacturing costs.

Description

Drilling screw manufacturing method

technical field

The invention relates to a manufacturing method, in particular to a manufacturing method of a drill tail screw.

Background technique

Drilling screws are a very common locking element, especially widely used in locking metal objects.

Please refer to FIG. 1 and FIGS. 2A-2D , wherein FIG. 1 is a flow chart of a manufacturing method of a conventional drill screw, and FIGS. 2A-2D are schematic diagrams of the manufacturing process of the drill screw. An existing method for manufacturing a drill screw includes a head-starting step P01 , a drill tail forming step P02 and a thread forming step P03 .

As shown in FIG. 2A , the heading step P01 preforms a head 11 from one end of the blank 1 by means of a screw forming machine (not shown). In addition, as shown in FIG. 2B , with the same screw forming machine, a screw head 12 is formed from the head 11 according to the shape of the mould.

Furthermore, as shown in FIG. 2C , the drill tail forming step P02 forms a drill tail 13 from the other end of the blank 1 by means of a drill tail forming machine (not shown).

Finally, as shown in FIG. 2D , the thread forming step P03 forms a plurality of threads 14 on the shaft of the blank 1 by means of a thread rolling machine (not shown in the figure), so as to complete the manufacture of the drill screw 2 .

However, in the existing manufacturing method of the drill tail screw 2, in addition to using a screw forming machine to form the head of the blank 1 into the screw head 12, a drill tail forming machine is also used to shape the drill tail 13 of the drill tail screw 2 In this way, not only the manufacturing process of the drilling screw 2 is complicated and the output is low, but also the equipment cost is higher due to the use of two different machines, resulting in the high manufacturing cost of the drilling screw 2.

Therefore, how to provide a method for manufacturing drill tail screws, which can not only simplify the manufacturing process and increase the yield, but also reduce the manufacturing cost, has become one of the important issues.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a method for manufacturing a drill-tail screw that not only simplifies the manufacturing process to increase the yield, but also reduces the manufacturing cost.

In order to achieve the above object, according to a method of manufacturing a drill tail screw of the present invention, it includes: a screw head forming step, forming a head from a blank on a forming machine, and forming a screw from the head head; and a drill tail forming step, forming a drill tail on the forming machine.

In an embodiment of the present invention, the shape of the screw head is hexagonal, square or circular.

In one embodiment of the present invention, the molding machine includes a first mold, a second mold and a third mold, and the first mold, the second mold and the third mold sequentially form the blank The head, the screw head and the drill tail.

In an embodiment of the present invention, the direction of the stamping action of the third mold is the same as the direction of the stamping action of the second mold.

In an embodiment of the present invention, the direction of the pressing action of the third die is 90 degrees to the direction of the pressing action of the second die.

In one embodiment of the present invention, the forming machine further includes a mold base, the mold base has a punch base and a fixed mold base, the first mold, the second mold and the third mold each have a movable mold and a fixed die, the plurality of movable dies are respectively arranged on the die holder, and the plurality of fixed dies are respectively arranged on the fixed die holder.

In an embodiment of the present invention, in the step of forming the drill tail, a transmission mechanism is used to rotate the blank by a preset angle.

In an embodiment of the present invention, the transmission mechanism includes a first gear and a second gear, and the rotation of the first gear drives the rotation of the second gear to rotate the blank by the angle.

In one embodiment of the invention, the angle is 90 degrees.

In an embodiment of the present invention, the manufacturing method of the drill end screw further includes: a screw thread forming step, forming a plurality of thread threads by means of a thread rubbing machine.

Based on the above, the manufacturing method of the drill tail screw according to the present invention includes a screw head forming step and a drill tail forming step. Wherein, the screw head forming step relies on a forming machine to form a blank material into a head, and the head is formed into a screw head, and the drill tail forming step is to form a drill tail on the forming machine. Thus, compared with the existing ones, the present invention uses the same forming machine to form the screw head and the drill tail. Therefore, not only can the manufacturing process of the drill tail screw be simpler and the output can be improved, but also because of the use of a The machine makes the equipment cost lower, making the manufacturing cost of the drill tail screw lower.

Description of drawings

Fig. 1 is the flowchart of existing a kind of drilling screw manufacturing method;

2A to 2D are schematic diagrams of the manufacturing process of the drill tail screw;

3A is a flow chart of a method for manufacturing a drill tail screw according to a preferred embodiment of the present invention;

FIG. 3B is a schematic diagram of the manufacturing process of the method for manufacturing the tail-drilling screw of FIG. 3A;

Fig. 4 and Fig. 5 are the schematic diagrams of transmission mechanism respectively;

Fig. 6 is a schematic diagram of manufacturing a drill tail of a drill tail screw;

Fig. 7 is another flowchart of a method for manufacturing a drill tail screw according to a preferred embodiment of the present invention; and

FIG. 8 is another schematic diagram of the manufacturing process using the manufacturing method of the drill tail screw shown in FIG. 3A .

Explanation of reference signs: 1, 3, 5-blank; 11, 31, 51-head; 12, 311, 511-screw head; 13, 32, 52-drill tail; 14, 33-thread; 2- Drilling screw; 4, 4a-forming machine; 41～43, 43a-mould; 411, 421, 431, 431a-moving mold; 412, 422, 432, 432a-fixed mold; 44-die seat; 441-die seat ; 442-fixed mold base; 451, 452-ejection pin; 46-transmission mechanism; 461, 462-gear; G-fixture; P01～P03, S01～S03-step.

Detailed ways

A method for manufacturing a drill screw according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

Please refer to FIG. 3A , which is a flow chart of a method for manufacturing a drill screw according to a preferred embodiment of the present invention. The manufacturing method of the drill tail screw of the present invention includes a screw head forming step S01 and a drill tail forming step S02.

Please refer to FIG. 3B , the screw head forming step S01 is: forming a head 31 from a blank 3 with a forming machine 4 , and forming a screw head 311 from the head 31 . Wherein, blank material 3 is metal. In addition, the forming machine 4 includes a first mold 41, a second mold 42 and a third mold 43, and the first mold 41, the second mold 42 and the third mold 43 make the blank 3 form the head 31 in sequence , screw head 311 and a drill tail 32.

Moreover, the molding machine 4 can further include a mold base 44 , and the mold base 44 has a punch base 441 and a fixed mold base 442 . In addition, the first mold 41, the second mold 42 and the third mold 43 respectively have a movable mold 411, 421, 431 and a fixed mold 412, 422, 432, and the movable molds 411, 421, 431 are respectively arranged on the die base 441 , and the fixed molds 412 , 422 , 432 are respectively arranged on the fixed mold base 442 . As can be seen from the names, the movable molds 411, 421, 431 are movable molds, while the fixed molds 412, 422, 432 are fixed.

In this embodiment, the molding machine 4 moves the blank 3 to the fixed mold 412 of the first mold 41 by means of a crankshaft, slide rails and clamps (not shown in FIG. shown) moves to the second mold 42 and the third mold 43. In addition, the head 31 can be formed by pressing down with the moving die 411 of the first die 41 , and the screw head 311 can be formed by pressing down with the moving die 421 of the second die 42 . In addition, after the stamping of the head 31 and the screw head 311 is completed, the formed blank 3 can be ejected from the fixed molds 412, 422 by means of a ejector pin 451, 452 respectively, so as to move to the next process respectively. Wherein, the shape of the screw head 311 can be, for example, hexagonal, square or circular, which is not limited here.

In particular, when the blank 3 moves from the first mold 41 to the second mold 42, another blank moves from the second mold 42 to the third mold 43 at the same time, and another blank moves from the outside to the Inside the first mold 41 , therefore, the forming machine 4 can continuously and simultaneously manufacture drill-end screws in each mold. What is particularly mentioned is that the existing screw forming machine can move the blank 3 to the next process by turning the crankshaft twice, but the crankshaft used in the forming machine 4 of the present invention can move the blank 3 only by turning once. to the next process, so its output can be higher than the existing one.

In addition, the drill tail forming step S02 is: stamping and forming a drill tail 32 on the forming machine 4 .

In this embodiment, when the blank 3 is moved to the first mold 41 and then moved from the second mold 41 to the second mold 42, the blank 3 maintains the same direction, such as the vertical direction in FIG. 3B . In other words, as shown in FIG. 3B , the blank 3 in the screw head forming step S01 is only moved, and the head 31 and the screw head 311 are stamped and formed in the first mold 41 and the second mold 42 respectively. However, in the step S02 of forming the tail, a transmission mechanism 46 is used to rotate the blank 3 by an angle.

Please refer to FIG. 3B and FIG. 4 at the same time. In this embodiment, the transmission mechanism 46 may include a first gear 461 and a second gear 462 . Wherein, the first gear 461 and the second gear 462 are engaged with each other, and when the first gear 461 rotates, it can drive the second gear 462 to rotate, so that the blank 3 rotates at an angle. Here, the blank 3 of the screw head 311 is clamped by a clamp G, and rotated by the first gear 461 , and then the second gear 462 can be linked to make the blank 3 rotate counterclockwise by an angle. Here, as shown in FIG. 5 , the angle of rotation is 90 degrees. Wherein, 90 degrees is just an example, of course, other transmission mechanisms can be designed to rotate different angles.

In addition, please refer to FIG. 6 , when the transmission mechanism 46 rotates the blank 3 by 90 degrees, the other end of the blank 3 can be stamped and formed into the drill tail 32 by means of the moving mold 431 and the fixed mold 432 . In particular, FIG. 6 is only a schematic diagram. Actually, as shown in FIG. 3B , the moving die 431 presses the fixed die 432 from above to below. Of course, in other designs, the direction in which the moving die 431 punches the fixed die 432 can also be horizontal or other directions.

To illustrate again, the present invention does not limit the angle at which the transmission mechanism 46 rotates the blank 3 to 90 degrees. In other embodiments, it can also be other angles, such as 60 degrees or 180 degrees, or even 360 degrees, or just move The blank 3 is not rotated, or the blank 3 is moved and rotated at the same time. In addition, the present invention does not limit that the transmission mechanism can only be gear transmission, and it can also be belt transmission, cam transmission or connecting rod transmission, etc., which is not limited here. As long as the blank 3 moved from the second mold 42 to the third mold 43 can be moved and/or rotated at an angle. In this embodiment, the direction of the pressing action of the third die 43 is the same as the direction of the pressing action of the second die 42 . However, the direction of the punching action of the third die 43 and the direction of the punching action of the second die 42 may be, for example, 90 degrees by virtue of different designs.

In addition, please refer to FIG. 7 , the manufacturing method of the drill tail screw of the present invention may further include a thread forming step S03, and the thread forming step S03 is: by means of a thread rubbing machine (not shown) on the blank 3 A plurality of screw threads 33 are rolled and formed on the shaft to complete the manufacture of the drill-end screw.

Next, please refer to FIG. 8 , which is another schematic view of the manufacturing process of the drilling screw manufacturing method in FIG. 3A .

The main difference between the embodiment of FIG. 8 and the embodiment of FIG. 3B is that when the blank 5 of FIG. The blank 5 moves to the third mold 43a but does not rotate, and the arrangement directions of the moving mold 431a and the fixed mold 432a of the third mold 43a are different from those shown in FIG. 3B . Therefore, the direction of the stamping action of the third die 43a in FIG. 8 is the horizontal direction, which is different from the direction of the stamping action of the second die 42, and the difference between the two is 90 degrees.

In addition, for other technical features of this embodiment, reference may be made to the previous embodiment, which will not be repeated here.

To sum up, the manufacturing method of the drill tail screw according to the present invention includes a screw head forming step and a drill tail forming step. Wherein, the step of forming the screw head relies on a molding machine to form a blank from a blank to form a head, and the head is formed into a screw head, and the step of forming a drill tail is to form a drill tail on the forming machine. Thus, compared with the existing ones, the present invention uses the same forming machine to form the screw head and the drill tail. Therefore, not only can the manufacturing process of the drill tail screw be simpler and the output can be improved, but also because of the use of a The machine makes the equipment cost lower, making the manufacturing cost of the drill tail screw lower.

The above description is for illustration only, not for limitation. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the appended patent application.

Claims (10)

1. A method for manufacturing a drill tail screw, characterized in that it comprises: A screw head forming step, forming a head from a blank on a forming machine, and forming a screw head from the head; and A drill tail forming step, forming a drill tail on the molding machine. 2. The manufacturing method of a drill end screw according to claim 1, wherein the shape of the screw head is hexagonal, square or circular. 3. The manufacturing method of drill end screw as claimed in claim 1, characterized in that, the forming machine comprises a first mold, a second mold and a third mold, the first mold, the second mold and the The third mold sequentially molds the blank to form the head, the screw head and the drill tail. 4 . The method of manufacturing a drill screw according to claim 3 , wherein the direction of the stamping action of the third die is the same as the direction of the stamping action of the second die. 5 . 5 . The method of manufacturing a drill screw according to claim 3 , wherein the direction of the pressing action of the third die is 90 degrees to the direction of the pressing action of the second die. 6 . 6. The manufacturing method of drill end screw as claimed in claim 3, characterized in that, the molding machine further comprises a mold base, the mold base has a punching die base and a fixed die base, the first mold, the second The mold and the third mold respectively have a movable mold and a fixed mold, the plurality of movable molds are respectively arranged on the die base, and the plurality of fixed molds are respectively arranged on the fixed mold base. 7 . The manufacturing method of a drill screw according to claim 1 , wherein, in the step of forming the drill screw, a transmission mechanism is used to rotate the blank by a preset angle. 8 . 8. The manufacturing method of a drill end screw as claimed in claim 7, wherein the transmission mechanism comprises a first gear and a second gear, and the rotation of the first gear drives the rotation of the second gear so that the blank The material is rotated by this angle. 9. The method for manufacturing a drill screw according to claim 8, wherein the angle is 90 degrees. 10. The method for manufacturing a drill end screw as claimed in claim 1, further comprising: In a thread forming step, multiple thread teeth are formed by means of a thread rubbing machine.

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