TWM529568U - Mold structure of self-tapping screw - Google Patents

Description

Self-tapping screw mold structure

This creation is about a mold structure of self-tapping screws, especially a mold for making self-tapping screws for cutting steel cutting edges, especially forging angled cutting edges, providing a convenient and practical cutting chip. Efficacy.

Pressing, self-tapping screws, also known as drill-tail screws, have a drill-and-cut structure at the end, which allows drilling, tapping, and tightening on the workpiece once, so there is no need to pre-drill in the assembly process. The hole is drilled with a self-tapping screw of a preset size to drill a hole in the workpiece, and a threaded hole is drilled in the workpiece to complete the tightening and locking operation, thereby being convenient and practical.

Generally, the end of the shaft of the self-tapping screw body is formed with a drill cutting portion, which has a drill edge, a cutting edge and a chip flute, and is drilled by a drill cutting edge at the end of the shaft body, and then the cutting edge is used to attack and cooperate. The female thread is used to discharge the chips by using the flutes to facilitate drilling, tapping and tightening.

Usually, the self-tapping screw is formed by using a self-tapping screw forming machine to form the cutting edge portion by means of punching and forging, and further grinding the teeth with a boring machine to form a threaded portion. The self-tapping screw forming machine has a punching and forging forming device, and the system has two relative In the mold, the impact surface of the mold is provided with a preset mold cavity, and the two molds are located at the bottom edge of the screw blank to form a screw blank to form a self-tapping.

China's new patent M361392 "Mold structure of the drilling screw" mainly discloses that the top end of the inner surface of the drill screw mold has a receiving groove for the drilling of the body of the forming screw, and one side of the bottom end of the receiving groove is convex. a punching block is formed for molding the chip flutes of the screws, and first and second bevels are sequentially formed from the inside and the outside at the bottom end of the punching block for forming a conical surface and a vertex of the screw body. The part can be drilled on the object by the apex of the screw body to form a hole, so that the apex portion is inserted into the hole to facilitate the positioning of the screw body, so as to achieve stable locking and positioning.

In addition, China's new patent No. M342224, "Mold for Simulating Drilling Screws", mainly exposes the surface of the drill tail main body of the drill tail screw mold, which is engraved with a spiral embossed line segment, so that the drill is stamped and manufactured using the mold. The tail screw will be embossed with a spiral indentation on the structural body to simulate the structure of the chip drainage groove on the real drill tail. When passing through, the debris can be effectively discharged and the efficiency of the plate penetration can be improved.

In the above structure, the former is mainly formed by the first and second inclined surfaces of the drill screw mold body for forming the conical surface and the apex portion of the screw body, and can be formed by drilling the apex portion of the screw body on the object first. a hole, which allows the apex portion to be inserted into the hole to facilitate the positioning of the screw body, so as to achieve a stable locking and positioning purpose, and the die system has a stamping block protruding from one side of the bottom end of the receiving groove. Corresponding chip flutes can be formed on both sides of the screw body to make the drilling process The generated chips will be moved up and down along the chip flute to avoid the formation of chip dust overheating during the locking drilling, and the chip can be prevented from overheating, which may result in the screw body being blunt or even broken due to high temperature tempering. .

The purpose of the latter mold design is to make a spiral embossed line segment on the surface on which the drill tail feature is made on the mold, so that the drill-tail screw punched out by the mold is also in the part of the drill tail feature. Spiral undercut segments are created. These spiral segments act like the chip flutes on the actual drill tail, effectively eliminating debris from cutting.

However, the creator of this case believes that there is still room for further improvement of the cutting edge and cutting edge mold of the self-tapping screw, so it is further provided to be more convenient and practical in structure.

The mold structure of a self-tapping screw disclosed in the present invention comprises: a mold body, two molds having corresponding shapes, and a mold hole disposed on each of the molds, the mold cavity having a first The impact surface and the second impact surface, the first impact surface and the second impact surface are not in the same plane, and a drilling edge groove is disposed in the cavity, and has a first drilling edge groove and a second drilling edge a groove, all the edge grooves are disposed in the cavity, and have a first cutting edge groove and a second cutting edge groove; by the above member, two molds having corresponding shapes, the first first impact surface and the right side The second impact surface, the second impact surface on the left side and the first impact surface on the right side are relatively closely connected in the impact forging, so that the cutting edge groove and the cutting edge groove can impact the drilling edge portion of the self-tapping screw and the spiral angle when impacted. The cutting edge is cut off smoothly and does not affect the quality of the self-tapping screws.

The main purpose of the creation is to provide a mold knot for self-tapping screws. Structure, since the cutting edge groove and the cutting edge groove are forged out the cutting edge portion of the self-tapping screw and the cutting edge portion having the helix angle, because the cutting edge portion having the helix angle, if the corresponding flat surface is used to punch the die, It is impossible to smoothly release the cutting edge portion with the spiral when the mold is opened. Therefore, the spiral angle design of the cutting edge portion of the self-tapping screw must be matched, and the first impact surface and the second impact surface are respectively provided with corresponding positive and negative inclination angles. On the upper impact surface, the positive and negative inclination angles are between plus and minus 1 to 45 degrees from the vertical plane of the mold to facilitate demolding.

The second purpose of the present invention is to provide a mold structure of self-tapping screws, wherein the cutting edge groove is matched with the spiral design of the cutting edge groove, so that the first impact surface and the second impact surface are respectively provided with corresponding intermediate impact surfaces and lower portions. The impact surface, the cutting edge groove also generates an oblique angle in the radial direction, and the first impact surface and the second impact surface have a matching angle with the spiral angle at the middle impact surface and the lower impact surface, so that the medium impact surface and the lower impact surface are generated. The surface is matched with the impact surface.

A further object of the present invention is to provide a mold structure of a self-tapping screw, wherein the cutting edge groove is arranged from the cutting edge groove to the top surface of the mold to be tapered, and the spiral angle of the cutting edge groove is set to allow the forming spiral The cutting edge has a tapered design. In addition to guiding the spiral spiraling of the chip, the tapered outer diameter of the cutting edge reduces the contact between the cutting edge and the hole, and reduces the friction resistance, thereby accelerating the cutting benefit.

(10)‧‧‧Mold body

(11) ‧‧‧ first impact surface

(111)‧‧‧Upper impact surface

(112) ‧‧‧ impact surface

(113)‧‧‧ Under the impact surface

(12) ‧‧‧second impact surface

(121) ‧‧‧Upper impact surface

(122) ‧‧‧ impact surface

(123)‧‧‧ Under the impact surface

(a) ‧‧‧negative tilt angle

(b) ‧ ‧ positive tilt angle

(20) ‧‧‧ cavity

(21)‧‧‧Drilling groove

(211)‧‧‧The first cutting edge groove

(212)‧‧‧Second drill edge slot

(22)‧‧‧ cutting edge groove

(221)‧‧‧First cutting edge groove

(222)‧‧‧Second cutting edge groove

(d) ‧ ‧ spacing

(30)‧‧‧ Self-tapping screws

The first figure is a perspective view of an embodiment of the present invention.

The second figure is a schematic plan view of an embodiment of the present invention.

The third figure is a schematic cross-sectional view of the creation embodiment.

The fourth figure is a schematic cross-sectional view of an embodiment of the present invention.

The fifth figure is a three-dimensional schematic view of the punching and forming self-tapping screws of the present embodiment.

The sixth figure is a perspective view of another perspective view of the punching and forming self-tapping screw of the present embodiment.

Please refer to the first figure. The creation is a mold structure of a self-tapping screw, which comprises: a mold body (10), two molds having corresponding shapes, and a mold body (10) disposed on each of the mold bodies (10). a cavity (20) having a first impact surface (11) and a second impact surface (12) on the left and right sides of the cavity (20), the first impact surface (11) and the second impact surface (12) not being The first impact surface (11) includes an upper impact surface (111), a middle impact surface (112), and a lower impact surface (113), and the second impact surface (12) includes an upper impact surface (121). The middle impact surface (122), the lower impact surface (123), and a drill edge groove (21) are disposed in the mold cavity (20), and have a first drill edge groove (211) and a second drill edge groove (212), all the edge grooves (22) are disposed in the cavity (20), and have a first cutting edge groove (221) and a second cutting edge groove (222).

By means of the above-mentioned members, two mold bodies (10) having corresponding shapes, when the two mold bodies (10) are on the punching machine, the two mold bodies (10) are installed on the left and right sides as shown in the second figure. The first impact surface (11) of the left mold body (10) corresponds to the second impact surface (12) of the right mold body (10), and the second impact surface (12) of the left mold body (10) corresponds to the right mold body (10). Impact surface (11), relatively densely interacted during impact forging The cutting edge groove (21) and the cutting edge groove (22) in the left and right mold holes (20) are impacted by the cutting edge portion of the self-tapping screw (30) and the cutting edge portion having the helix angle when impacting, so The first impact surface (11) and the second impact surface (12) are respectively provided with an upper impact surface (121) having an upper impact surface (111) and a positive inclination angle (b) corresponding to a negative inclination angle (a), which The positive and negative tilt angles (a, B) are the angles from the vertical plane of the mold, and can be selected from plus or minus 1 to 45 degrees depending on the cutting application.

At the same time, the cutting edge groove (21) cooperates with the spiral design of the cutting edge groove (22), so the first impact surface (11) and the second impact surface (12) are respectively provided with corresponding intermediate impact surfaces (112, 122) and lower The impact surface (113, 123), the cutting edge groove (21) also produces an oblique angle in the radial direction, as shown in the third figure, the middle impact surface of the first impact surface (11) and the second impact surface (12) (112, 122) and the lower impact surface (113, 123) have a helix angle and a spacing (d), so that the middle impact surface (112, 122) and the lower impact surface (113, 123) can be matched with the impact surface. The upper impact surface (111, 121) is closely connected and can be smoothly released, and does not affect the quality of the self-tapping screw (30).

Please refer to the fourth figure, from the cutting edge groove (21) in the cavity (20) to the cutting edge groove (22). The top surface of the mold body (10) is set to have a tapered inner diameter. The spiral angle of the edge groove (22) is set so that the spiral cutting edge portion of the self-tapping screw (30) formed has a tapered shape, except that the chip spiral spiraling upwards, the cutting edge is generated by guiding the tapping screw of the self-tapping screw (30). The tapered outer diameter reduces the contact between the cutting edge and the hole, reduces the resistance caused by friction, and accelerates the cutting benefit.

Please refer to the fifth and sixth figures. The cutting edge of the self-tapping screw (30) is gradually reduced from the diameter of the drill blade to the middle section of the self-tapping screw (30), which is tapered and self-tapping. The taper and spiral design of the cutting edge of the screw (30) guides the chip spiraling upwards in the chip flute.

In summary, the "mold structure of self-tapping screws" disclosed in the present invention provides a method for producing a spiral cutting chip with a drill blade portion and a spiral cutting edge portion, and reinforces the reaming ability after the drilling operation, and simultaneously combines the rows. The chip groove guides the chip breaking so that the chip breaking chip can smoothly move the self-tapping screw (30). Therefore, the impact surface of the two die body (10) is different from the design of the same plane of the formula, and the design is different in one plane. , the overall structure can be more quickly formed, more labor-saving, and the mold release is smooth, and the self-tapping screw cutting edge chip removal structure which is convenient and practical is obtained, so that the whole industry is practical and cost-effective, and its structure I have never seen it in various books or publicly used, and I am in line with the requirements for new patent applications. I would like to ask the Bureau to give a clear indication of patents.

To be clear, the above is the specific embodiment of the creation and the technical principles applied. If the changes made according to the concept of this creation, the functional role produced by it does not exceed the spirit of the manual and the drawings. At the time, it should be combined with Chen Ming within the scope of this creation.

(10)‧‧‧Mold body

(11) ‧‧‧ first impact surface

(111)‧‧‧Upper impact surface

(112) ‧‧‧ impact surface

(113)‧‧‧ Under the impact surface

(12) ‧‧‧second impact surface

(121) ‧‧‧Upper impact surface

(122) ‧‧‧ impact surface

(123)‧‧‧ Under the impact surface

(a) ‧‧‧negative tilt angle

(b) ‧ ‧ positive tilt angle

(20) ‧‧‧ cavity

(21)‧‧‧Drilling groove

(211)‧‧‧The first cutting edge groove

(212)‧‧‧Second drill edge slot

(22)‧‧‧ cutting edge groove

(221)‧‧‧First cutting edge groove

(222)‧‧‧Second cutting edge groove

(d) ‧ ‧ spacing

Claims (6)

A mold structure of a self-tapping screw, comprising: a mold body, two molds having corresponding shapes, and a mold cavity disposed on each of the molds, the mold cavity having a first impact surface and a second An impact surface, the first impact surface and the second impact surface are not in the same plane; a drilling edge groove is disposed in the cavity, and has a first drilling edge groove and a second drilling edge groove; The system is disposed in the cavity and has a first cutting edge groove and a second cutting edge groove. The mold structure of the self-tapping screw according to the first aspect of the patent application, wherein the first impact surface and the second impact surface both include an upper impact surface and a middle impact surface and a lower impact surface. According to the mold structure of the self-tapping screw according to the first aspect of the patent application, the angle between the impact surface above the first impact surface and the vertical surface of the mold is between 1 and 45 degrees. According to the mold structure of the self-tapping screw according to the first aspect of the patent application, the angle between the impact surface on the second impact surface and the vertical surface of the mold is between minus 1 and 45 degrees. The mold structure of the self-tapping screw according to the second aspect of the patent application, wherein the impact surface of the first impact surface and the impact surface of the second impact surface have a fixed distance. The mold structure of the self-tapping screw according to the second aspect of the patent application, wherein the impact surface below the first impact surface and the impact mask below the second impact surface have a fixed distance.