TW201350690A - Screw drill tail structure - Google Patents

Abstract

The present invention relates to a screw drill tail structure. The periphery of the screw drill tail has a parting line used to divide the drill tail symmetrically into a first edge and a second edge, wherein the first edge has a first vertical line direction, and the second edge has a second vertical line direction. An oblique cutting end respectively formed on both of one side of the end portion of the first edge and the other side of the end portion of the second edge, and the cutting ends of both the first and second edges are provided with a first chip groove of a quarter circle along the same spiral direction concavely; a second chip groove of a quarter circle with a different spiral curvature concavely figured at the second edge following the first chip groove of the first edge, and a second chip groove of a quarter circle with a different spiral curvature concavely figured at the first edge following the first chip groove of the second edge, wherein the directions of the first vertical line of the first chip groove of the first edge and the second chip groove of the second edge is unlimited hollow as a whole, and the directions of the second vertical line of the first chip groove of the second edge and the second chip groove of the first edge is unlimited hollow as a whole, such that the screws can be manufactured with two sectional dies, achieving the advantages of mass production, high strength of drill tails and excellent chip removal effects.

Description

Screw drill tail structure

The invention relates to a screw structure, in particular to an improved design of a drill tail type for one end of a screw, which is suitable for quantitative production while improving the performance and strength of the screw tail.

According to the current structure of the screw with a drill tail, there are mainly three types: one, as shown in the first figure, wherein one end of the screw 1 is provided with a drill tail section 11 and the drill tail section 11 is on two opposite planes, and is integrally stamped and formed. Relative to the chip flute 111, the chip flute 111 must be formed on a flat surface to provide stamping die stamping, so that the chip flute 111 can only extend vertically in a plane or slightly inclined in a plane. The one end stamping and forming tail section 11 has the advantage of being suitable for mass production and strength, but the extending direction of the chip flute 111 can only be completed linearly in the plane, which is poor in chip discharging ability.

The other one, as shown in the second figure, wherein one end of the screw 2 is provided with a drill tail section 21, the drill tail section 21 is cylindrical, and then at least two pieces are processed in the drill tail section 21 by milling or the like. The spiral chip flute 211 has a better chip discharging capability for the spiral chip flutes 211, but the milling process such as milling of the chip flutes 211 is too expensive and is not suitable for mass production.

Another type, as shown in the third figure, wherein one end of the screw 3 is provided with a drill tail section 31, and the drill tail section 31 is a flat strip shape, and is processed in a twisting manner to process the flat drill tail section 31. Two spiral flutes 311 The washed spiral flutes 311 have better chip removal capability, but are formed in a twisting manner, which is not suitable for mass production, and the torsion process may damage the structural strength of the tail section 31.

Furthermore, as the simulated drill-tail screw of the patent publication No. M372230, the definition can integrally process the screw of the simulated drill tail, but the sixth and the ninth view, the mold design of the ninth figure is actually not It is possible to form the screw of the sixth figure. In fact, the spiral groove 16 of the spiral curve can only be rotated in the range of 90 degrees, and cannot be in the range of 180 degrees as shown in the sixth figure, because the simulated tail of the two pairs is simulated. The spiral limit of the two ends of the chip groove 16 of the spiral curve of the screw mold 92 causes a dead angle that cannot be extracted, so that although the flat chip flute 111 of the first figure screw can be jumped off, the spiral curve shape is The chip flutes 16 are still unable to reach a 180 degree turn.

Therefore, the design has a advantage of having all the screws with the drill tail section, and the disadvantages of all the screws with the tail end of the drill are eliminated, so that the screw with the drill tail section can be suitable for mass production; the processing and manufacturing cost is low; the material structure strength is good. And the advantages of good chip removal effect are the focus of research and development of the present invention.

The present inventors have the following disadvantages in view of the fact that the current tail screw has the following disadvantages: 1. The extending direction of the chip flute can only be linearly completed on the plane, so the chip removing ability is poor; 2. The chip flute is in a milling process, The spiral spiral flutes are expensive and not suitable for mass production. 3. The flutes are formed by twisting, which is not suitable for mass production, and the torsion process will damage the structural strength of the tail section; The inventor finally introduced the present invention after a number of revisions and improvements.

The invention provides a screw drill tail structure, the screw system comprises: a screw rod having a first end and a second end; a screw head formed on the first end of the screw rod; a drill tail formed on the screw rod a second end, the periphery of the drill tail has a clamping line, the symmetry of the tail is divided into a first side and a second side, and the first side has a first vertical line direction, the second side Having a second vertical line direction, one side of the first side end and the other side of the second side end portion each form a beveled cutting end, and the cutting ends of the first side and the second side are spiral in the same direction Each recess is provided with a quarter turn of a first chip flute, and the second side is connected to the first flute of the first side and has a second spiral flute with a different spiral curvature The first side is connected to the second side of the first chip flute, and the second chip flute is recessed with a different spiral curvature, and the first side of the first chip flute and the second side The first vertical line direction of the two chip flutes is entirely unrestricted hollow, and the second vertical line direction of the first flute of the second side and the second flute of the first side A hollow unlimited.

The main purpose of the screw tail structure of the present invention is that the first chip flute on the first side and the second chip flute on the second side are connected by different spiral curvatures, and the second side is used. A chip flute is in contact with a different spiral curvature of the second chip flute of the first side, and the first vertical line direction of the first flute and the second flute of the first side is entirely unlimited. Hollow, available for demoulding, the second vertical line of the first flute on the second side and the second vertical line of the first flute in the first side are all unrestricted hollow, forming a two-way symmetry and up to 180 degrees in the tail The chip winding track, this kind of structural design can be produced by using two pairs of molds, with a large number of production, and the triple advantages of good piercing strength and good chip removal effect.

In the following, the preferred embodiment of the present invention will be described in detail with reference to the drawings. As shown in the fourth figure, the screw 4 of the present invention comprises: a screw rod 41 having a first end 411 and a second end. 412, and the surface of the screw rod 41 is provided with a thread 413.

A screw head 42 is formed on the first end 411 of the screw shaft 41 to provide a convenient force to rotate the screw 4.

A drill tail 43 is formed on the second end 412 of the screw rod 41. The end has a pointed shape. The periphery of the drill tail 43 has a clamping line 44, as shown in the fifth and fifth A drawings. The drill tail 3 is symmetrically divided into a first side 43A and a second side 43B, and the first side 43A has a first vertical line direction Y1, and the second side 43B has a second vertical line direction Y2, see the sixth figure. As shown, one end of the first side 43A and one side of the second side 43B form a beveled cutting end 45A, 45B to form a tip end shape of the drill tail 43, and the first side 43A And the cutting ends 45A, 45B of the second side 43B are recessed with a quarter turn of the first chip flutes 46A, 46B, as shown in the sixth and seventh and eighth figures; the second The first chip 43B is connected to the first chip 43A, and the second chip flute 47B is recessed with a different spiral curvature. See the seventh figure; the first side 43A is connected. The second chip 43B of the second side 43B is further recessed with a second spiral groove 47A with a different spiral curvature, see As shown in FIG. 8 , the first chip 43A of the first side 43A is connected to the second chip flute 47B of the second side 43B, and the first chip flute 46B of the second side 43B is connected to the second chip flute 47A of the first side 43A. Two 180-degree complete chip removal tracks are formed respectively, and the seventh and eighth figures are matched with the ninth figure; and the first chip flutes 46A, 46B are connected to the second chip flutes 47A, 47B are formed at the bottom of the groove The sub-wiring 48, the splicing outer side is formed with a waist-cutting demolding space 49, which is matched with the tenth view; the demolding space 49 can provide the first side 43A of the first flute 46A to completely follow the second side 43B. The two chip flutes 47B, and the first flutes 46B of the second side 43B are more completely connected to the second flutes 47A of the first side 43A; thereby, the first flanks 46A and the second side 43B of the first side 43A The first vertical line direction Y1 of the two chip flutes 47B is entirely unrestricted hollow for release, and the second side 43B is the first vertical line of the first chip flute 46B and the first side 43A of the second chip flute 47A. The direction Y2 is entirely unrestricted and can be demolded. Please use the seven or eight pictures to match the eleventh and twelfth pictures.

According to the above, the first chip flute 46A of the first side 43A and the second chip flute 47B of the second side 43B are joined by different spiral curvatures, and the first flutes of the second side 43B are utilized. 46B is different from the second chip flute 47A of the first side 43A by a spiral curvature, and the first side 43A of the first chip flute 46A and the second side 43B of the second flute groove 47B of the first vertical line direction Y1 are entirely For unrestricted hollowing, for demolding, the second side 43B first chip flute 46B and the first side 43A of the second flute groove 47A of the second vertical line direction Y2 are all unrestricted hollow, can be drilled 3 form a two-way symmetrical and 180 degree complete chip removal track, this species The structural design can be produced using two pairs of molds, with a large number of productions, and the triple advantages of producing a drill tail 3 with good strength and good chip removal effect.

1‧‧‧ screws

11‧‧‧Drill tail section

111‧‧‧chip flute

2‧‧‧ screws

21‧‧‧Drill tail section

413‧‧ thread

42‧‧‧ screw head

43‧‧‧Drill tail

44‧‧‧Molding line

43A‧‧‧ first side

211‧‧‧ chip flute

3‧‧‧ screws

31‧‧‧Drill tail section

311‧‧‧chip flute

4‧‧‧ screws

41‧‧‧ Screw rod

411‧‧‧ first end

412‧‧‧ second end

43B‧‧‧ second side

Y1‧‧‧first vertical line direction

Y2‧‧‧second vertical line direction

45A, 45B‧‧‧ cutting end

46A, 46B‧‧‧First chip flute

47A, 47B‧‧‧Second flutes

48‧‧‧Wiring

49‧‧‧Rejection space

The first picture: a perspective view of a drill with a drill tail screw.

Figure 2: Another perspective view of a drill with a drill tail screw.

Figure 3: Another perspective view of a drill with a drill tail screw.

Fourth Figure: A perspective view of the screw of the present invention.

Fig. 5 is an enlarged perspective view of the screw drill tail of the present invention, showing a mold clamping line.

Figure 5A: An enlarged plan view of the screw drill tail of the present invention, showing a mold clamping line.

Figure 6: Front view of the screw of the present invention.

Figure 7 is an enlarged perspective view of the screw drill tail of the present invention.

Eighth view: Another perspective view of the screw tail of the present invention is enlarged.

Ninth view: Side view of the screw of the present invention.

Figure 10: Top view of the screw of the present invention.

Eleventh drawing: Schematic diagram of the demolding direction of the first chip flute and the second chip flute of the screw of the present invention.

Twelfth Figure: Schematic diagram of the first chip flute and the second chip flute of the screw of the present invention are formed with different spiral curvatures.

43‧‧‧Drill tail

45A, 45B‧‧‧ cutting end

46A‧‧‧First chip flute

47B‧‧‧Second flute

48‧‧‧Wiring

Claims (4)

A screw drill tail structure, the screw system comprises: a screw rod having a first end and a second end; a screw head formed on the first end of the screw rod; and a drill tail formed on the second screw rod The end of the drill tail has a mold clamping line, and the mold line is divided into a first side and a second side, and the first side has a first vertical line direction, and the second side has a a second vertical line direction, wherein one side of the first side end and the other side of the second side end portion form a beveled cutting end, and the cutting ends of the first side and the second side are concave in the same direction a first chip flute having a quarter turn, wherein the second side is connected to the first chip flute of the first side and the second chip flute is recessed with a different spiral curvature. The first chip is connected to the first chip flute of the second side, and the second chip flute is recessed with a different spiral curvature, and the first flute is connected to the second flanks of the second side. The chip flute, the first flute of the second side is connected to the second flute of the first side, respectively forming two 180-degree complete chip flutes, and the first flute continues A dividing wire is formed at the bottom of the groove of the chip flute, and the first vertical line direction of the first side first chip flute and the second side second chip flute is unrestricted hollowing, and the second side is the first row The second perpendicular direction of the flutes and the second flutes of the first side is entirely an unrestricted hollow. The screw tail structure of claim 1, wherein the surface of the screw rod is provided with a thread. The screw tail structure of claim 1, wherein the end of the drill has a pointed shape. The screw drill tail structure according to claim 1 of the patent application, In the middle of the sub-wiring of the drill tail, a blanking space is formed.