TWI645921B - Pre-punching screw forming method and screw thereof - Google Patents

Abstract

The invention relates to a pre-perforated screw forming method and a screw thereof, comprising the steps of preparing a metal wire; forming a metal wire to form a head and a shaft, forming a head and a shaft forming step of the semi-finished screw; and installing the semi-finished screw The head is pre-formed into a groove forming step for forming a groove; the screw forming the groove is formed by re-punching the groove with the needle to form a driving groove forming step of the driving groove; the forming driving groove system Corresponding to the needle tool, the step of forming the screw with the forming screw is completed; thereby, the utility model provides a method for greatly reducing the deformation amount of the screw head and the driving groove provided thereon during the press forming, improving the precision of the driving groove and the tool for the screwdriver. The adhesiveness makes the screw of the common concave driving groove be surely matched with the screwdriver tool, thereby effectively improving the function of the screw driving groove and the screwdriver tool, and does not need to prepare a special specification of the screwdriver tool, thereby being effective A pre-punched screw forming method for improving the convenience of screwing and reducing cost, and a screw finished product.

Description

Pre-punching screw forming method and screw thereof

The invention relates to a pre-perforated screw forming method and a screw thereof, in particular to a method for greatly reducing the deformation amount of a screw head and a driving groove provided thereon during press forming, improving the precision of the driving groove and the adhesion with the screwdriver tool. The utility model can effectively improve the function of the screw driving slot and the screwdriver tool to be engaged and clamped, and the utility model does not need to additionally manufacture the special shape driving groove and the corresponding screwdriver tool, thereby effectively improving the screw screw locking convenience and reducing the cost of the pre-punching hole. The screw forming method and the finished screw made by the same.

Press, generally combine the positioning of two different objects, the system is mostly implemented by screw screw combination, as shown in Figure 1, whether it is wood screws, mechanical screws or self-drilling screws, etc. A head 11 is provided with a screw 12 under the head 11. The tip of the screw 12 can be formed into a tip shape (or a tail portion or a flat head shape) according to different uses, and the head portion 11 is provided with a driving groove 13 for driving the slot 13 The shape can be a cross shape, a quincunx shape, a hexagonal shape, etc.; the driving groove 13 can provide a corresponding insertion of the screwdriver tool 20, thereby driving the screw 10 to rotate to achieve the function of the screw lock and the combined object.

However, since the driving groove 13 of the conventional screw 10 is formed, when the head 11 of the screw 10 is formed, the needle is directly punched on the head 11 so that the head 11 forms a driving groove 13 corresponding to the shape of the needle. However, since the head 11 of the screw 10 is solid, when it is punched by the needle to produce the drive groove 13, it causes the head 11 to be deformed by impact and deformation, thereby causing the drive The groove 13 also undergoes deformation and hole expansion, so that the size of the driving groove 13 after molding is larger than the size of the needle, and each screw 10 is made due to the uniformity of the material of the screw 10 and the heat temperature during heat treatment of the wire pretreatment. The deformation of the driving groove 13 is different from that of the reaming phenomenon, and the error of the uniformity of the wire is very difficult to control, and the molding method of the conventional screw causes a large error in the driving groove 13, thereby making the screwdriver tool The gap between the 20 and the driving groove 13 is not surely fitted to form a gap A (as shown in FIG. 2), and even the driving groove 13 is broken due to improper force applied by a person, thereby affecting the progress of the screw locking operation. Regarding the case where the screwdriver tool 20 cannot be engaged with the driving groove 13 provided on the screw 10, and the convenience of the one-hand operation of the screw lock is provided, many manufacturers have magnetized the screw so that the screwdriver tool 20 can be used. It is attracted to the screw 10 so that the screw 10 is not detached from the screwdriver tool 20 to provide the convenience of the human screw lock; however, when the screw 10 is made of a material that cannot be magnetized (for example, a stainless steel screw), the screwdriver tool 20 still cannot be used. The driving groove 13 attracts the joint, and the person needs to hold the screw in one hand and the screwdriver tool 20 in the other hand to work, and has the inconvenience in the operation of the screw lock, and when the working place of the person is high altitude, roof, work ladder... At the same time, it will increase the risk of injury and falling. In addition, there are also some manufacturers to develop a special screw drive slot that can be fitted and fixed, and a corresponding screwdriver tool to improve the convenience of the screw lock. However, since it is a special specification screw and screwdriver tool, its popularity is not It is high, but it is still inconvenient to purchase and use; therefore, how to improve the adhesion between the screw drive slot and the screwdriver tool is still a problem that the current industry pursues and is eager to solve.

The object of the present invention is to improve the above-mentioned defects and reduce the deformation error of the stamping molding, and to provide a molding precision for improving the screw driving groove, so that the driving groove of the screw can be highly fitted with the screwdriver tool, thereby improving the screw screw lockability. Pre-punched screw forming method.

In order to achieve the above object, the pre-punching screw forming method of the present invention comprises the following steps: preparing a metal wire for preparing a forming screw; forming a head and a shaft: forming the metal wire into a head and a shaft Forming a semi-finished product of the screw; forming the groove: pre-forming the head of the semi-finished product of the screw to form a groove; forming the driving groove: pressing the screw of the forming groove, and then punching the groove with the needle, and The depth of the punching of the needle is smaller than the depth of the groove, so that the groove forms a driving groove; the screw forming is completed: the driving groove formed by the above is matched with the needle and the screw is formed; and the above steps are used to reduce the stamping Deformation error, 俾Provide a pre-punching screw forming method that can improve the forming precision of the screw drive groove, make the screw drive groove fit with the screwdriver tool height, and improve the screw screw lock convenience.

10‧‧‧ screws

11‧‧‧ head

12‧‧‧ screw

13‧‧‧ drive slot

20‧‧‧ screwdriver tools

30‧‧‧ screws

31‧‧‧ head

32‧‧‧ shaft

33‧‧‧ Groove

34‧‧‧ drive slot

40‧‧‧ Tools

41‧‧‧ needles

50‧‧‧ screwdriver tools

Figure 1 is a schematic cross-sectional view of a conventional screw.

Figure 2 is a schematic view of the screwdriver inserted into the conventional screw.

Figure 3 is a flow chart of the method of the present invention.

Figure 4 is a schematic view of the preparation of the screw of the present invention.

Fig. 5 is a schematic view showing the formation of a groove by the press screw of the present invention.

Fig. 6 is a schematic view showing the formation of a groove by the screw of the present invention.

Figure 7 is a schematic view showing the stamping groove of the present invention forming a driving groove.

Figure 8 is a schematic view showing the screw forming drive groove of the present invention.

Figure 9 is a schematic view of the drive slot provided by the screwdriver insertion screw.

The technical means for achieving the object of the present invention, together with the embodiment shown in Figures 3 to 9, will be described in detail as follows: As shown in Figure 3, the pre-punched screw forming method in the embodiment The method includes the following steps: preparing materials: preparing metal wires for forming screws.

Head and shaft molding: The metal wire is formed into a head and a shaft to form a semi-finished screw.

Groove forming: The head of the above-mentioned screw semi-finished product is pre-formed to form a groove.

The driving groove is formed: the screw of the forming groove is punched again by the needle, and the depth of the punching of the needle is smaller than the depth of the groove, so that the groove forms a driving groove.

The screw forming is completed: the driving groove of the above molding is matched with the needle, and the screw is formed.

According to the above, the needle can be in the shape of a cross, a plum, a hexagon, etc., so that the driving groove is formed by pressing the needle to form a corresponding shape.

By the above steps, the screw 30 prepared by the method of the present invention is formed by molding the head 31 and the shaft 32 (as shown in FIG. 4), and the head 31 of the screw 30 is stamped by the tool 40 to pre-form a groove. 33 (as shown in Figures 5 and 6), and then punching the groove 33 with the needle 41, The groove 33 is stamped to form the drive groove 34 (as shown in Figures 6, 7, and 8), and since the punching depth of the needle 41 is smaller than the depth of the groove 33, when the groove 33 is received by the needle 41 When punching, the material of the head 31 which is impacted by the needle 41 will push and escape toward the bottom of the groove 33 (as shown in Figures 7 and 8), so that the driving groove 34 is not expanded or contracted, and The hole edge of the driving groove 34 is not expanded to the outside, so that the deformation amount is not excessively large, so that the shape and size of the driving groove 34 after molding are matched with the needle 41; thereby, the person directly inserts the screwdriver tool 50. When the screw 30 is driven in the groove 34, since the screwdriver tool 50 is engaged with the driving groove 34 and no gap is generated (as shown in FIG. 9), the screw 30 does not fall off, and the person can The screwdriver tool 50 is operated with one hand to perform a screw lock operation.

In view of the above, the screw made by the molding method of the present invention is specially designed for the screw 30 having the concave driving groove 34. Therefore, the common square groove, hexagonal groove, TORX, etc. The geometrically shaped drive slot 34 allows the shaped drive slot 34 to be securely mated to the conventional driver tool 50 without the need to prepare a special size screwdriver tool.

From the above, it can be seen that the present invention has the following advantages:

(1) Since the present invention pre-punches a groove 33 in the head portion 31 of the screw 30, and then presses the groove 33 again with the needle 41 to form the driving groove 34, since the side wall of the groove 33 is pressed The material will push and escape to the bottom of the groove 33, so that the formed driving groove 34 will not be deformed and reamed, and the deformation of the head 31 or the disintegration of the head 31 can be reduced, and the precision of the driving groove 34 and the integrity of the head 31 can be improved. The outer dimension of the driving groove 34 is matched with the needle, so that the screwdriver tool 50 can be surely engaged with the driving groove 34 to facilitate the subsequent screwing operation.

(b) Since the present invention reshapes the driving groove 34 by pre-forming the groove 33, the driving groove 34 is matched with the needle 41, and the driving groove 34 of the screw 30 and the screwdriver tool can be made. 50 corresponds to the anastomosis. When the screwdriver tool 50 is inserted, the screwdriver tool 50 does not cause a gap, and can reduce the shaking and falling off of the screwdriver tool 50, thereby improving the convenience and accuracy of the subsequent screwing operation.

(3) Since the molded screw 30 is prepared by the method of the present invention, the driving groove 34 is matched with the needle 41, and the screwdriver tool 50 generally sold on the market corresponds to the needle 41, and thus is prepared by the method of the present invention. The molded screw 30 can be screwed to the general screwdriver tool 50 without the need to operate with a special-purpose screwdriver tool, which is practically convenient and practical, and can reduce the cost of purchasing other screwdriver tools.

(4) Further, the molded screw 30 is prepared by the method of the present invention, and the driving groove 34 is matched with the needle 41 and matched with the general screwdriver tool 50. Therefore, the screw 30 made by the molding method of the present invention does not need magnetization. There is no need to make a screw with a special size drive slot and a corresponding screwdriver tool, but the mechanical properties of the drive slot 34 provided by the generally commercially available screwdriver tool 50 and the screw 30 can be highly adhered and fitted. Therefore, it can also be applied to stainless steel screws and other non-magnetizable screws, and the screwdriver tool 50 can be fitted and fixed in the driving groove 34 of the screw 50, so that the person can operate the screw lock with one hand without the need for both hands to work simultaneously. It can reduce the cost of screw manufacturing and the convenience of operation.

(5) In addition, since the present invention pre-punches a groove 32 in the head 31 of the screw 30, the groove 33 is again punched by the needle 41 to form the driving groove 34, so that the extruded material can escape to The bottom of the groove 33 prevents the drive groove 34 and its groove from being excessively deformed or collapsed, so that the drive groove 34 has the sameness, thereby making the overall appearance of the screw 30 aesthetic and complete.

(6) In addition, the screw 30 made by the method of the present invention is driven by the slot The 34 can be highly tightly fitted and framed with the screwdriver tool 50, so that the person can effectively apply force to perform the screw lock; and when the work piece is metal and has a smooth surface, the person can abut the screw 30 against the surface of the work piece due to The screwdriver tool 50 is tightly fitted and locked with the driving groove 34 of the screw 30, so that the screw 30 and the screwdriver tool 50 are not easy to be shaken and dropped, and the personnel can surely perform positioning and screw locking, which has the accuracy and convenience of construction work. safety.

(7) Further, since the molding method of the present invention can not only greatly reduce the amount of deformation of the drive groove 34 of the screw 30 during press forming, the molding precision and integrity of the drive groove 34 can be improved, and the head 31 of the screw 30 can be reduced. The deformation and damage of the force enable the screw 30 formed by the method of the present invention to ensure that the driving groove 34 and the screwdriver tool 50 are tightly fitted and clamped, thereby improving the integrity of the finished screw and the convenience of the screw lock, and the present invention is indeed A highly technical screw forming method, and the screws formed by the method are also highly technical.

Therefore, it can be seen from the above that the present invention can provide the driving groove on the head of the screw to be engaged with the screwdriver tool, and the screw can be applied to the stainless steel screw without magnetization, so that the personnel can be more convenient. The method of forming a driving groove for stable and rapid screw locking operation; therefore, the invention has significant novelty and progress, and has already met the patent requirements of the invention, and has filed a patent application according to law, and prayed for a patent for prayer. Debian.

The above descriptions are merely illustrative of the possible embodiments of the present invention, and thus the scope of the present invention is not limited thereto, and all of them are equally varied or modified according to the description of the present invention and the scope of the patent application. It should remain within the scope of protection covered by the present invention.

Claims (2)

A pre-punching screw forming method comprises the following steps: preparing a material: preparing a metal wire for forming a forming screw; forming a head and a shaft: forming the metal wire to form a head and a shaft to form a semi-finished screw; Groove forming: pre-stamping the head of the semi-finished screw to form a groove; forming the driving groove: re-punching the screw of the forming groove and punching the groove with the needle, and punching the depth of the needle The depth is smaller than the depth of the groove, so that the groove forms a driving groove; the screw forming is completed: the driving groove formed by the above is corresponding to the needle, and the screw is formed. A screw made by the pre-punched screw forming method described in claim 1.