TW201716696A - Structure and manufacturing method of self-tapping screw for reducing resistance, increasing drilling/tapping speed and enhancing service life of self-tapping screw - Google Patents

Abstract

The present invention relates to a self-tapping screw, and, more particularly, to a screw for being tapped and drilled into a work piece such as a wood plank or metal plate. The screw is provided with a tapping/drilling portion. The structure of the tapping/drilling portion may provide the functions for assisting in accelerating and successfully removing chips. Thust, when the screw is screwed into the work piece, the present invention may achieve the cutting and fast-tapping functions.

Description

Self-tapping screw structure and manufacturing method

The invention relates to a self-tapping screw structure, in particular to a screw for drilling a wooden board or a metal plate, in order to increase the fast drilling and attacking function of the self-tapping screw, increase the structure of the chip removing and strengthening the screw rod body, so that it is drilling Reduces resistance when attacking the workpiece, increases drilling speed, and enhances the life of the self-tapping screws.

According to the creator of the case, the original patent creation number: I352160 "self-tapping screw structure", a self-tapping screw improved structure, comprising: a screw head, one end of which is provided with a screw, and the front end of the screw extends with a pointed cone a drill bit having a symmetrical longitudinal cutter surface diagonally opposite to the corner, the longitudinal cutter surface having a tapered tapered surface formed at the tapered portion and a constricted tapered surface at the opposite end of the longitudinal cutter surface; The symmetrical oblique cone section has a plurality of ridges at the blade front, which mainly improves the function of rapid drilling and attack, and provides an improved structure for rapidly discharging waste. However, the inventor of the present invention believes that it is necessary to increase the speed efficiency. The place for improvement.

The main purpose of the invention is to increase the toughness of the quick chip breaking, the guiding chip and the reinforcing screw, so that the contact with the working piece can be reduced, not only has the fast cutting function, but also strengthens the body strength of the screw and avoids the screw. The screw breaks during the drilling and attack, so as to achieve the screw that accelerates the drilling benefit.

The self-tapping screw of the invention is made by two different manufacturing methods, and the finished product can be quickly formed by two steps of forming. The detailed description is that the self-tapping screw improved structure is mainly divided into two parts, including a rod body and a drilling and attacking portion formed by one end of the rod body; wherein the rod body is provided with a chip guiding portion and a threaded portion, wherein one end of the guiding chip portion is a threaded portion, and the threaded portion extends to the other end to form a spiral guiding portion; The guiding portion has a groove portion; wherein the guiding portion and the thread portion of the rod body are formed by roll forming by a mold, the mold is provided with two different shapes of helical teeth, wherein the helical tooth The tooth pattern includes a helical tooth pattern of a shape of a chip guide portion and a helical tooth pattern of a thread portion shape. First, the rod body is pressed in the mold by rolling and pressing to form a thread portion and a chip guide portion, and the guide piece is formed after the forming. One end of the chip portion still retains a final stage of unthreaded cylinder; wherein the drilling and tapping portion is formed by placing one end of the guiding chip portion and leaving the unformed column between a top and bottom mold, and the upper and lower molds are The mold is pressed into the structure of the drill tap.

The rod body is a screwing function for driving and locking to the processing member; wherein the connecting portion is disposed at one end of the guiding chip portion as a drilling and attacking portion, and the drilling and tapping portion has a pair of blade portions, and the blade tip end extends Forming a blade; and providing a guiding portion between the blade portions, wherein the guiding portion is extendedly connected to the chip guiding portion, wherein the guiding chip portion is surrounded by a rib from one end of the rod body to one end of the drilling and attacking portion in a spiral shape Formed, following the rib formed at the bottom of the slope is a groove portion, the rib extending from the first side of the inclined surface to form a third side of the opposite slope, wherein the first side and the third side have a a second side of the plane is defined by the first side extending to form the second side, the second side extending to form the third side, the drill tap having a pair of symmetrically formed edges, the edge having a first inclined surface, and a second inclined surface opposite to the first inclined surface; and a first portion extending downward from the blade; and a second portion extending from the first portion, and the second portion is connected to the second portion In the third part, the top end of the blade portion is a blade edge, and the blade portion is composed of a pair of oppositely corresponding inclined surface blades, and one of the blade portions is provided with an extended longitudinal tooth pattern on the inclined surface edge, the first portion and the first portion The third portion has a slope with a high and low drop, and the first portion is higher than the third portion. The second portion is a sloped surface, and the second portion extending from the first portion to form a slope surface extends to a lower slope to a third portion. An extension of the portion; the second portion is formed by a blade edge to guide the chip evacuation function, and is defined in detail as a second portion formed by the blade top extending in a slope and extending to the groove end of the chip guide portion, thereby When the drill bit is in contact with the working piece, it has the function of assisting acceleration and smooth chip removal, thereby achieving the performance of the quick attack.

Wherein, the longitudinal section of the rib is a mountain shape, and the first side of the inclined surface extends to form a second side opposite to the inclined surface.

Further, the third portion is provided with a chip breaking portion, and the chip breaking portion extends from the end side of the second portion to the third portion, and the chip breaking portion may be laterally extended to the third portion, or The lateral portion extends in the third portion.

The structure of the innovative combination can improve the characteristics of the cutting auxiliary auxiliary area when the drill bit is in contact with the working piece and can reduce the friction force, and have the function of guiding the waste material to the surface of the working piece, thereby achieving rapid drilling and attack. efficacy.

1‧‧‧ rod body

2‧‧‧Threading Department

3‧‧‧Guidance

4’‧‧‧Drilling and attacking department

42‧‧‧blade

31‧‧‧ rib

42a‧‧‧ Blade Front

314‧‧‧ slot department

311‧‧‧ first side

312‧‧‧ second side

End of 21‧‧‧

41‧‧‧ Beginning

4a‧‧‧ first side

4b‧‧‧ second side

411, 411’‧‧‧ first

412, 412‧‧‧ second

413, 413‧‧‧ third

421‧‧‧ teeth

422, 423‧‧‧ swarf edges

3a‧‧‧End

4‧‧‧Cylinder

313‧‧‧ third side

414‧‧‧ chip breaking

31a1‧‧‧Width

The first figure is a front view of the invention.

The second drawing is a partially enlarged schematic view of another embodiment of the present invention.

The third figure is an enlarged perspective view of another embodiment of the blade and the guide portion of the present invention.

The fourth figure is a schematic diagram of the process steps of the present invention.

The fifth figure is a front view enlarged view of the blade portion and the guide chip portion of the present invention.

Figure 6 is a side elevational view of the blade portion and the chip guide portion of the present invention.

Figure 7 is an enlarged cross-sectional view showing another embodiment of the present invention.

The present invention will be described in detail with reference to the accompanying drawings, in which FIG. The statements in this specification are hereby implemented and are not intended to limit the technical scope of the invention.

First, please refer to the improved structure of the self-tapping screw of the present invention as shown in the first and fifth and sixth figures, comprising: a rod body 1 having a screw head, one end of the rod body 1 extending to form a threaded portion 2 having an external thread One end of the threaded portion 2 extends to form a spiral guiding portion 3, and the guiding portion 3 extends to form a drilling and attacking portion 4', and the tip end of the drilling and attacking portion 4' extends to form a symmetrical pair of blade portions 42; The threaded portion 2 refers to a screwing function for driving and locking to the workpiece; the chip guiding portion 3 is formed by a rib 31 extending from the end of the threaded portion 2 in a spiral shape around the rod body 1, wherein The longitudinal section of the rib 31 is a mountain shape; and the rib 31 of the spiral extends to form an accompanying groove portion 314 which extends from the first side 311 of a slope to form a second side 312 of the opposite slope. It is said that the first side 311 and the second side 312 are both inclined surfaces, wherein the rib 31 starts from the end 21 of the threaded portion 2, and the drilling ends The first portion 4a has a first surface 4a and a second surface 4b opposite to the first surface 4a. The first surface 4a is extended by a first portion 411. a second portion 412, the second portion 412 is connected to a third portion 413; the second portion 4b has a first portion 411' opposite to the first surface 4a and is connected to a second portion 412, the second portion The portion 412 is extended to a third portion 413; and the top end of the drill portion 4' is provided with a blade portion 42 which is composed of a pair of opposite corresponding beveled edges, the top of which is a blade edge 42a, the bevel edge of the blade portion 42 is provided with extended longitudinal ribs 421, and the edge edges of the pair of blade portions 42 respectively extend downward to form a pair of dicing edges 422, 423 extending to the dicing edges 422, 423 a bottom end of the drill tapping portion 4'; and the first portion 411 and the third portion 413 have a height difference slope, and the first portion 411 is higher than the third portion 413, and the second portion 412 is a slope The second portion 412 extending from the first portion 411 to form a slope surface extends further downhill to extend the connection of the third portion 413; wherein the second portion 412 of the drill tap portion 4' The extension portion is formed, and the second portion 412 is connected to the end portion 3a of the groove portion 314 which is closest to the drill portion 4'; and the chip edges 422, 423 extend to the rib 31 of the chip guide portion 3, The pair of chip edges 422 and 423 are inclined at an angle different from each other, wherein the inclination angle of the chip side 422 is smaller than the inclination angle of the rib 31 of the chip guide portion 3.

The blade portion 42 has a first surface 4a and a second surface 4b opposite to the first surface 4a. The first portion 411 of the first surface 4a extends to a second portion 412. The second surface 4b The first portion 411 opposite to the first surface 4a extends to a second portion 412. The second portion 412 extends to a third portion 413. The top end of the blade portion 42 is a blade edge 42a. The blade edge 42a A pair of oppositely opposite inclined bevels, the corresponding edges of the blade edge 42a are each provided with an extended longitudinal rib 421, and the first portion 411 and the third portion 413 have a height difference slope, and the The first portion 411 is higher than the third portion 413, and the second portion 412 is a sloped surface, which is a second portion extending from the first portion 411 to form a slope surface. The portion 412 extends further downhill to extend the connection of the third portion 413; wherein the second portion 412 of the blade portion 42 has a guiding ramp function, and the second portion 412 is directly extended to connect the guiding portion 3 to be the closest The blade portion 314 end portion 3a of the blade portion 42; and the blade edge 42a has an extended sloped slope edge, the slope edge of the blade edge 42a is provided with an extended longitudinal tooth 421, and the pair of blade edges 42a respectively extend The chip edges 422, 423 are formed downward, and the chip edges 422, 4232 extend to the ribs 31 of the chip guiding portion 3, wherein the chip edges 422 are inclined edges, and the pair of chip edges 422, 4232 are at different inclination angles with each other. Correspondingly, wherein the inclination angle of the chip edge 422 is smaller than the inclination angle of the rib 31 of the chip guide portion 3, thereby the blade edge 42a of the blade portion 42 has the function of assisting acceleration and smooth chip removal when contacting the workpiece, thereby achieving The speed of the quick attack.

Further, in another embodiment of the invention, as shown in the second and third and seventh figures, the guide portion 3 is formed by a rib 31 spirally surrounding from one end of the screw 2 toward the end of the blade end 42a. The rib 31 is formed. The longitudinal section is a mountain shape, and the ridge 31 follows a mountain-shaped bottom portion extending into a groove portion 314. The rib 31 extends from a first side 311 of the inclined surface to form a third side 313 opposite to the inclined surface, wherein the first side 311 and the The second side 312 has a second side 312 as a plane side. Specifically, the first side 311 and the third side 313 are both inclined, and the two corresponding inclined surfaces form a mountain shape, and the second side is the second side. Edge 312 is a plane.

As shown in the seventh figure, a longitudinal sectional view of the rib 31 of the self-tapping screw of the present invention extends from the first side 311 of the inclined surface to form a third side 313 opposite to the inclined surface, the first side 311 and the third side 313 is a planar second side 312, wherein the angle of inclination of the first side 311 and the third side 313 is the same as the conventional one, because the relative inclination of the first side 311 and the third side 313 A second side 312 of a plane is added between the two ends. For this reason, the width 31a1 of the bottom end is increased. By increasing the width 31a1 of the bottom end, the strength of the shaft body of the guide portion 3 is relatively increased, and the guide portion 3 is increased. The strength is to avoid being broken or damaged due to high-speed torsional stress.

Further, as shown in FIG. 4, in the two-stage process step of the present invention, first, a step of forming the chip forming portion 3 and the thread portion 2 of the rod body 1 is to use a helical tooth having two different shapes. a tooth-shaped mold (not shown) is formed, and the helical tooth pattern includes a helical tooth pattern of a shape of a chip guide portion and a helical tooth pattern of a thread portion shape, and the rod body 1 is rolled on a mold. Pressing to form the threaded portion 2 and the chip guide portion 3, and after forming, the end of the chip guide portion 3 still retains a final stage of the unthreaded column 4; further, the second step is forming the drill tapping portion 4' In order to prevent the one end of the above-mentioned chip forming portion 3 from remaining unformed, the column 4 is placed between an upper and lower mold, and the upper and lower molds are clamped and pressed to form a structure of the drill tapping portion 4'.

The structural advantages of the present invention are as follows: 1. The tip end of the pair of blade portions 42 of the drill tapping portion 4' extends to form a blade edge and the second portion 412 provided between the blade portion 42 extends to the groove portion 314 of the chip guiding portion 3; The blade portion 42 of the drill tapping portion 4' has the function of assisting acceleration and smooth chip removal when contacting the workpiece, thereby achieving the performance of the quick attack; 2. The third portion 413 of the blade portion 42 is disposed near the blade edge 42a. There is a chip breaking portion 414 extending from the end edge of the second portion 412 to the third portion 413, which is disposed in parallel with the blade portion 42 and which is laterally extendable to the third portion 413 The bottom end may also extend laterally to the third portion 413, wherein the chip breaking portion 414 is slightly protruded from the horizontal surface of the third portion 413. In other words, the chip breaking portion 414 is at the third portion. A convex rib is formed on the surface of the portion 413, and the function is that when the self-tapping screw is drilled on the workpiece, the scrap generated by the cutting edge 42a is helical, and the chip breaking occurs. The rib 414 is designed to break the spiral shavings, making it a chip breaking, thereby allowing the chip breaking to be smooth by the slope of the second portion 412. The chip guide portion homeopathic slide groove portion 3143 of the connection portion of the groove 314 to be smoothly pushed against the workpiece outside the cavity. The advantages of the manufacturing method of the present invention are as follows: 1. First, the chip forming portion 3 and the threaded portion 2 are formed by rolling, and then the drilling and attacking portion 4' is formed by clamping, and the second portion 412 can be quickly and accurately connected to the guiding portion 3 The groove portion 314.

By adopting the innovative combination structure and the manufacturing method, the drilling and attacking portion 4' can be improved in rapid contact with the workpiece, and the function of guiding the waste to the surface of the workpiece can be reduced, and the damage rate of the self-tapping screw can be reduced. In order to achieve the performance of a fast drill.

In conclusion, it is only a preferred embodiment of the invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the patent application of the present invention are covered by the scope of the invention.

1‧‧‧ rod body

2‧‧‧Threading Department

3‧‧‧Guidance

4’‧‧‧Drilling and attacking department

42‧‧‧blade

31‧‧‧ rib

42a‧‧‧ Blade Front

314‧‧‧ slot department

311‧‧‧ first side

312‧‧‧ second side

End of 21‧‧‧

41‧‧‧ Beginning

4a‧‧‧ first side

4b‧‧‧ second side

411, 411’‧‧‧ first

412, 412‧‧‧ second

413, 413‧‧‧ third

421‧‧‧ teeth

422, 423‧‧‧ swarf edges

3a‧‧‧End

4‧‧‧Cylinder

Claims (5)

The self-tapping screw improved structure is composed of a rod body, and one end of the rod body extends to form a threaded portion; the threaded portion extends at one end to form a chip guiding portion, and the thread guiding portion is extended by the end of the threaded portion to form a spiral, and the spiral portion thereof The ribbed bottom is formed with a groove portion extending along; and the end of the guiding chip portion extends to form a drilling and attacking portion, and the end of the drilling and attacking portion extends to form a pair of blade portions; wherein the blade portion is a pair of opposite portions Corresponding to the edge edge of the slope, wherein the two ends of the blade portion respectively extend downward to form a pair of chip edges, wherein the pair of chip edges correspond to different inclination angles, wherein the inclination angle of the chip edge is smaller than the rib of the guide chip portion The angle of inclination; and the second portion directly extends the end of the groove portion connecting the chip guide portion. Self-tapping screw method, the step of self-tapping screw forming is mainly divided into two parts, the forming structure is divided into a rod body portion and a drilling and attacking portion formed by one end of the rod body; wherein the rod body is provided with a chip guiding portion and a threaded portion, wherein one end of the guide portion is a threaded portion, and the threaded portion extends to the other end to form a spiral guide portion, the guide portion has a groove portion; first, in the first step, the guide portion of the rod body is The threaded portion is formed as: a mold having two different shapes of helical teeth, wherein the helical tooth pattern comprises a helical tooth pattern and a thread shape of the shape of the chip guide portion, and the rod body is firstly rolled and pressurized. The thread is pressed to form a threaded portion and a chip guide portion, and after forming, the end of the guide chip portion still retains a column having a non-threaded end; and, in the second step, the drill tapping portion is formed to: One end of the part retains the unformed cylinder and is placed between an upper and lower mold, and the upper and lower molds are pressed by the mold to form a structure of the drill tap. The self-tapping screw improved structure comprises: a rod body having a threaded portion, one end of the threaded portion extending to connect with a guiding portion; a drilling and tapping portion formed by one end of the guiding chip portion, a blade portion, the blade portion Formed by one end of the guide chip portion, the end portion of which extends to form a blade edge; wherein the chip guide portion is formed by a rib from one end of the screw shaft to one end of the blade portion in a spiral shape, the rib is longitudinally divided into a mountain shape a ribbed mountain formed at a bottom portion thereof as a groove portion, the rib extending from a first side of a slope to form a second side of the plane, the second side extending to form a third side of the slope, wherein the first side The side and the third side are two corresponding slopes forming a mountain shape, the second side is a plane at the top of the mountain; the blade portion has a first surface, and a second surface opposite to the first surface, The first portion opposite to the second surface and the second portion are connected to a second portion, and the second portion is connected to a third portion, and the third portion of the blade portion is disposed near the edge a chip breaking portion, the chip breaking portion extending from the end side of the second portion to the third portion, a row corresponding to the blade portion, which may be laterally extended at a bottom end of the third portion or a lateral portion extending to the third portion; and the blade edge is formed by a pair of oppositely beveled edges, The edge of the opposite bevel of the blade edge is provided with an extended longitudinal slant slope, and the second portion is a slanted surface, and the second portion extending from the first portion to form a slope surface extends to the lower portion to the third portion An extension joint, the second portion directly extending the end portion of the groove portion connecting the chip guide portion, thereby having the function of assisting acceleration and smooth chip removal when the blade edge of the blade portion contacts the workpiece, thereby achieving a speed attack efficacy. The utility model relates to a self-tapping screw improved structure, a rod body is provided with a threaded portion, one end of the threaded portion is connected to a guiding portion; and a drilling and tapping portion is formed by extending one end of the guiding chip portion, and is provided with a blade portion; The chip guiding portion is formed by a rib system spirally surrounding the end of the threaded portion toward the starting end of the drilling and attacking portion, and the rib is longitudinally divided into a mountain shape, and a mountain shape following the spiral rib is formed at the bottom thereof. for a groove portion; and the chip guide portion extends to form a blade portion, the blade portion end extending to form a blade edge; wherein the chip guiding portion is surrounded by a rib from one end of the screw to the edge of the blade end in a spiral shape Forming, the rib is longitudinally sectioned into a mountain shape, and the rib shape is followed by a groove portion at a bottom thereof, the rib extending from a first side of a slope to form a second side of the plane, the second side extending to form a third surface of the slope An edge, wherein the first side and the third side are two corresponding slopes forming a mountain shape, the second side is a plane at the top of the mountain; the blade portion has a first surface, and is opposite to the first surface a second surface of the opposite surface, the first portion and the second surface having opposite sides are oppositely connected to a second portion, and the second portion is connected to a third portion, wherein the blade portion is The third portion is provided with a chip breaking portion near the blade edge, and the chip breaking portion extends from the end edge of the second portion to the third portion, which is disposed corresponding to the blade portion, and the blade edge is a pair of relative a beveled edge, the opposite beveled edge of the blade edge is provided with an extended longitudinal tooth pattern, the first portion and the The third portion has a high and low drop slope, and the second portion is a sloped surface, and the second portion extending from the first portion to form a slope surface extends further downhill to extend the connection of the third portion, and the second portion is directly extended and connected. The end portion of the groove portion of the chip guide portion has a function of assisting acceleration and smooth chip removal when the blade edge of the blade portion comes into contact with the workpiece, thereby achieving the speed attack performance. As described in the fourth aspect of the patent, the chip breaking portion may be laterally extended at a bottom end of the third portion, or may extend laterally to the third portion.