JP3178553U - Screw drill end structure - Google Patents

Abstract

[PROBLEMS] To produce a screw having advantages such as mass production by using a mold configured by two pairs, the strength of a manufactured drill end is good, and the chip discharge effect is good. Provide the drill end structure. .
There is a parting line 44 on the periphery of a screw drill end 43, and the parting line 44 symmetrically divides the drill end 43 into a first side 43A and a second side 43B. The oblique cutting edges 45A and 45B are formed at the end and the second end, respectively, and the first and second sides are provided with a first chip discharge groove 46A and a second chip discharge groove 47B, respectively. Provide. The first chip discharge groove 46A on the first side 43A and the second chip discharge groove 47B on the second side 43B are in contact with each other, and the first chip discharge groove on the second side and the first chip discharge groove on the first side The two chip discharge grooves are formed in contact with each other, thereby forming two complete chip discharge curved paths that straddle the parting line by 180 degrees.
[Selection] Figure 9

Description

  The present invention relates to a screw structure, and more particularly to a screw drill end structure suitable for mass production, while designing the drill end form of one end of the screw to improve the use performance and strength of the screw drill end. is there.

  At present, there are mainly three types of screw drill end structures, one of which is provided with a drill end portion 11 at one end of the screw 1 as shown in FIG. In the two relative planes on top of each other, the opposing chip discharge grooves 111 are integrally formed by pressing, and if such chip discharge grooves 111 are not placed on one plane, the press mold is pressed. There is a possibility that it cannot be provided. Therefore, the chip discharge groove 111 can only be designed to extend vertically on the plane or slightly inclined on the plane, and this kind of integrally press-formed drill end portion 11 has a high strength and a large amount. Although there is an advantage that it is suitable for production, there is a problem that the chip discharging ability is inferior because the extending direction of the chip discharging groove 111 can only extend linearly on a plane.

Taiwan registered utility model No. M372230 specification

  As shown in FIG. 2, a drill end portion 21 is provided at one end of the screw 2 as shown in FIG. 2, and the drill end portion 21 has a cylindrical shape. The part 21 is formed by processing at least two spiral chip discharge grooves 211, and the chip discharge capability of the spiral chip discharge groove 211 exposed to this kind of milling is good, but the chip discharge groove 211 is formed. There was a problem that the cost of processing such as milling was too high to be suitable for mass production.

  Furthermore, as shown in FIG. 3, a drill end 31 is provided at one end of the screw 3, and the drill end 31 is a flat and slender shape. The flat-shaped drill end portion 31 is processed into two spiral chip discharge grooves 311, and the twisted spiral chip discharge groove 311 of this kind is good in chip discharge capability, but is formed by a torsion method. Therefore, it is not suitable for mass production, and the structural strength of the drill end portion 31 may be destroyed in the twisting process.

  Moreover, as described in the patent prior document of Taiwan registered utility model No. M372230 “screw having a pseudo drill end”, it was defined as a screw having a pseudo drill end integrally processed. 6 and FIG. 9 attached, the mold design of FIG. 9 is practically impossible to mold the screw of FIG. The screw discharge groove tank of the spiral curve style of a screw mold having a pseudo drill end which is configured to be twisted only in a range of 180 degrees and not in the range of 180 degrees as illustrated in FIG. Since there is a spiral restriction at both ends, a blind spot that cannot be punched occurs, so that it is possible to get over the flat chip discharge groove of the screw shown in FIG. Chip discharge Bath can not still reach the screw rotation of 180 degrees.

  Therefore, it has all the advantages of the screw with the current drill end part, solves all the disadvantages of the screw with the current drill end part, makes the screw with the drill end part suitable for mass production, and low The focus of research and development of the present invention is to design a screw drill end structure that has advantages such as processing cost, low manufacturing cost, good material structure strength and good chip discharge effect.

  The purpose of the present invention is to make use of the fact that the first chip discharge groove on the first side and the second chip discharge groove on the second side are in contact with each other. By utilizing the fact that one chip discharge groove and the second chip discharge groove on the first side are in contact with each other, two complete chip discharge curves reaching symmetrical and 180 degrees are formed. According to the structural design, since it can be produced using a mold configured in two pairs, mass production is possible, the strength of the manufactured drill end is good, and the chip discharge effect is good. Three advantages are obtained.

Here, in the screw drill end structure of the present invention, the screw includes a screw shank having a first end and a second end opposite to the first end, and a screw head formed on the first end of the screw shank. And a drill end formed at the second end of the screw shank, and has a parting line at the periphery of the drill end, and the drill end is connected to the first side and the second side by the parting line. The oblique drill cutting ends are respectively formed on one side surface of the first side end portion and the other side surface of the second side end portion, and the first side and the second side are The first chip discharge groove having the same direction spiral is provided in the direction from the drill cutting end to the screw shank, and the first side and the second side of the first direction spiral screw are located at positions close to the screw shank. Two chip discharge grooves are provided, and the first chip discharge groove and the second side on the first side The second chip discharge groove is in contact with the second chip discharge groove and the second chip discharge groove on the second side is in contact with each other. It is characterized in that each complete chip discharge curve is formed.
In addition, it is preferable that a screw thread is provided on the surface of the screw shank. The end of the drill end may have a pointed cone shape. Further, a cutting blade may be formed on the side edge of the first chip discharge groove on the first side and the second side of the drill end, and the second chip discharge groove on the first side and the second side of the drill end is the first. It may have a spiral curvature different from the one chip discharge groove.

  As described above, according to the present invention, three advantages can be obtained: mass production is possible, the strength of the manufactured drill end is good, and the chip discharge effect is good.

It is a perspective view of the screw which has the conventional drill end. FIG. 6 is a perspective view of a screw having another conventional drill end. FIG. 6 is a perspective view of a screw having yet another conventional drill end. It is a perspective view of the screw of the present invention. It is a top view of the drill end of this invention. It is an end view of the drill end of this invention. It is a perspective view of the drill end of this invention. It is a perspective view at the time of seeing from another angle of the drill end of this invention. It is a perspective view at the time of seeing from another angle of the drill end of this invention. It is a perspective view at the time of seeing from still another angle of the drill end of this invention. It is a top view of the screw of the present invention. It is a top view at the time of seeing from another angle of the screw of the present invention. It is a figure which shows the press molding of the screw | thread of this invention.

4 to 11, the screw 4 includes a screw shank 41, a screw head 42, and a drill end 43, and the screw shank 41 includes a first screw shank 41. It has an end 411 and a second end 412 opposite to the first end 411, and a screw thread 413 is provided on the surface of the screw shank 41.
The screw head 42 is formed at the first end 411 of the screw shank 41 and is adapted to roll by applying a force to the screw 4 conveniently.
As shown in FIGS. 6 to 12, the drill end 43 is formed at the second end 412 of the screw shank 41, and the end thereof has a pointed cone shape, and is non-linear on the periphery of the drill end 43. The mold end line 44 is provided so that the drill end 3 is symmetrically divided into the first side 43A and the second side 43B, and one side surface and the second side of the end of the first side 43A Inclined drill cutting ends 45A and 45B are formed on the other side surface of the end portion of 43B, respectively, and the end of the drill end 43 is formed to have a pointed cone shape. The side 43B is provided with first chip discharge grooves 46A and 46B having spirals in the same direction in the direction from the drill cutting ends 45A and 45B to the screw shank 41, and one side surface of the first chip discharge grooves 46A and 46B. Cutting blades 46C and 46D are formed at the end edges. Further, the first side 43A and the second side 43B are respectively provided with second chip discharge grooves 47A and 47B having spirals in the same direction at positions approaching the screw shank 41, and the second chip discharge groove 47A. 47B
Has a spiral curvature different from that of the first chip discharge grooves 46A, 46B, and the first chip discharge groove 46A on the first side 43A is in contact with the second chip discharge groove 47B on the second side 43B, and The first chip discharge groove 46B on the second side 43B is in contact with the second chip discharge groove 47A on the first side 43A, so that two complete chip discharge curved lines straddling the parting line 44 by 180 degrees are formed. Each formed

  Accordingly, the drill end 43 of the present invention is divided into the first side 43A and the second side 43B by the parting line 44, and the first end having different spiral curvatures on the first side 43A and the second side 43B. Chip discharge grooves 46A and 46B and second chip discharge grooves 47A and 47B are provided, respectively, and the first chip discharge groove 46A on the first side 43A straddles the parting line 44 and the second on the second side 43B. The first chip discharge groove 46B on the second side 43B crosses the parting line 44 and touches the second chip discharge groove 47A on the first side 43A so as to be in contact with the chip discharge groove 47B. In the press molding, as shown in FIG. 13, the first chip discharge groove 46A and the second chip discharge groove 47A on the first side 43A are press-molded by one mold unit of the molds, and the mold The second side 43B of the second side 43B in another mold unit of the mold The chip discharge groove 46B and the second chip discharging groove 47B and press-molding, can be easily press-molded and stamped. As a result, the first chip discharge groove 46A on the first side 43A and the second chip discharge groove 47B on the second side 43B become the first chip discharge groove 46B on the second side 43B and the second chip discharge on the first side 43A. The grooves 47A are connected so as to form a spiral chip discharge groove of 180 degrees.

  In the case of performing the tightening operation with the screw 4 of the present invention, when the target object is excavated and tightened with the oblique drill cutting ends 45A and 45B of the drill end 43 and the cutting blades 46C and 46D, the screw shank 41 At the same time as the screw thread 413 is screwed into the target object and tightened, chips generated during the excavation process are removed from the first chip discharge grooves 46A and 46B and the second chip discharge grooves of the drill end 43. Passing through 47A and 47B is smoothly discharged to the outside, and chips are not clogged in the chip discharge groove, and the thermal influence of frictional heat generation is reduced, thereby achieving the purpose of high-quality penetration processing.

  As in the structure of the specific embodiment described above, the drill end 43 of the screw 4 of the present invention has a spiral in which the first chip discharge groove 46A on the first side 43A and the second chip discharge groove 47B on the second side 43B are different. Utilizing the fact that the first chip discharge groove 46B on the second side 43B and the second chip discharge groove 47A on the first side 43A are in contact with each other with different spiral curvatures. By forming two complete chip discharge curves that are symmetrical and reach 180 degrees, according to the structural design of this kind, it is possible to use two molds in a press molding method. Since it can be produced, mass production is possible, and three advantages are obtained, that is, the manufactured drill end 43 has a good strength and a good chip discharging effect.

DESCRIPTION OF SYMBOLS 1 Screw 11 Drill end part 111 Chip discharge groove 2 Screw 21 Drill end part 211 Chip discharge groove 3 Screw 31 Drill end part 311 Chip discharge groove 4
Screw 41
Screw shank 411 First end 412 Second end 413 Thread 42
Screw head 43
Drill end 43A first side 43B second side 44
Cutting line 45A Drill cutting end 45B Drill cutting end 46A First chip discharge groove 46B First chip discharge groove 46C Cutting blade 46D Cutting blade 47A Second chip discharge groove 47B Second chip discharge groove

Claims (5)

A screw drill end structure, wherein the screw is
A screw shank having a first end and a second end opposite the first end;
A screw head formed at the first end of the screw shank;
A drill end formed at the second end of the screw shank, and having a parting line at the periphery of the drill end, and the drill end is symmetrical on the first side and the second side by the parting line And forming an oblique drill cutting end on one side surface of the first side end portion and another side surface of the second side end portion, respectively, and forming the first side and the second side. Are provided with first chip discharge grooves having spirals in the same direction in the direction from the drill cutting end to the screw shank, and the first side and the second side are close to the screw shank. A second chip discharging groove having a spiral in the same direction is provided, and the first chip discharging groove on the first side and the second chip discharging groove on the second side are in contact with each other, The first chip discharge groove on the second side and the second chip discharge groove on the first side are in contact with each other. Accordingly, characterized in that the complete chip discharge tortuosity of two across parting lines 180 are formed, drill end of screw.   The screw drill end structure according to claim 1, wherein a thread is provided on a surface of the screw shank.   The screw drill end structure according to claim 1, wherein an end of the drill end has a pointed cone shape.   2. The screw drill end structure according to claim 1, wherein a cutting blade is formed on a side edge of the first chip discharge groove on the first side and the second side of the drill end. 3.   2. The screw drill end according to claim 1, wherein the second chip discharge groove on the first side and the second side of the drill end has a spiral curvature different from that of the first chip discharge groove. Construction.

Images