JP3109645U - Cutting tool with multiple helix angles - Google Patents

Abstract

[PROBLEMS] To prevent the occurrence of a situation where the amount of chips to be discharged is sufficient and the chips are clogged up to block the diameter of the hole, and the rigidity of the cutting tool is increased accordingly. The present invention provides a cutting tool having a multiple helix angle that is less likely to sag or break a drill.
A blade portion is helically twisted from a cutting edge, and the blade portion has a groove having at least two stages of twist angles. The twist angle of each step is different, and the center line of the blade portion is gradually reduced in the angle of the twist angle in the front and rear stages, and the area of the groove is gradually increased. Cutting tools with multiple helix angles are designed to have a structure with multiple helix angles, so that the helix angle of the blade part has a drill hole center with a gradually increasing thickness in the plate, and the blade part Certain twist angles also become shallower.
[Selection] Figure 3

Description

  The present invention relates to a cutting tool having multiple helix angles. The cutting tool of the present invention has the features that the strength of the cutting tool is increased and the chip is better discharged due to the presence of grooves having a plurality of inclination angles.

Polishing the drill head is the key to a good drill function. In order to cut more effectively, the exact cutting edge angle must be determined by the material of the object to be cut.
In addition, the quality of the drill is greatly related to the design of the inclination angle of the blade portion. Please refer to FIG. 1 and FIG. The conventional cutting tool 10 includes a shank 101 and a blade portion 102. The blade portion 102 has a groove having a twist angle, and a plurality of inclination angles 103 are formed. The angle of each inclination angle 103 is equal, and the cutting tool 10 having a single helix angle has a constant cutting function corresponding to the depth of the inclination angle 103. In the case of a plate material having high hardness and difficult to cut, it is necessary to increase the cutting force. For this reason, the cutting tool 10 is easily worn or bent or bent due to insufficient rigidity.
Furthermore, when the conventional cutting tool 10 drills a hole in the plate 3 ', the amount of chips to be discharged is small due to insufficient rigidity, and the chips block the grooves when drilled at high speed. For this reason, when a hole is made in a plurality of plate members 3 ′, the plate member 3 below the stacked plates may have less chip discharge due to insufficient rigidity of the cutting tool 10, and the diameter 4 ′ of the drilled hole may be biased. Many. Therefore, a phenomenon occurs in which the number of rejected plate members 3 ′ increases.

  Since the conventional cutting tool has only a single helix angle, the cutting tool is distorted or broken due to the relationship between the inclination angle and the rotation speed, and the cutting work cannot be effectively performed (particularly, It is an object of the present invention to provide a cutting tool having multiple torsion angles that can improve a large number of problems when a plurality of plates are stacked.

The cutting tool having multiple twist angles according to the present invention comprises a shank and a blade portion. The blade portion is helically twisted from the cutting edge, and the blade portion has a groove having a twist angle of at least two stages. The twist angle of each step is different, and the center line of the blade portion is gradually reduced in the angle of the twist angle in the front and rear stages, and the area of the groove is gradually increased. Therefore, since the cutting tool having multiple helix angles of the present invention is designed to have a structure with multiple helix angles, the helix angle of the blade portion has a drill hole center having a thickness gradually in the plate, The torsion angle at the blade part also becomes gradually shallower. The groove area also increases accordingly. Therefore, the amount of chips to be discharged is sufficient, and it is difficult for a situation in which chips are jammed to block the diameter of the hole. Therefore, the thickness of the drill hole center of the blade portion gradually increases, and the rigidity of the cutting tool increases accordingly. When drilling at high speed, the accuracy of the hole is high, and it is less likely to distort or break the drill.

The cutting tool with multiple helix angles of the present invention has a drill hole center where the helix angle of the blade part gradually increases in thickness, with the helix angle of the blade part changing,
Further, the torsion angle at the blade portion also becomes gradually shallower, and the angle of the torsion angle at the front and rear stages of the center line gradually decreases, so that the area of the groove also gradually increases. Therefore, the amount of chip discharge is sufficient, and it is difficult for the situation that the chip is clogged up to block the diameter of the hole. In addition, when drilling, there is an effect that the accuracy of the hole becomes higher.
In addition, the cutting tool with multiple twist angles of the present invention is designed so that the long groove of the blade part has multiple twist angles, and furthermore, (θ) gradually decreases due to the inclination angle. As a result, the amount of chip discharge increases, and there is an effect that it is possible to avoid a situation in which the chips block the grooves in the cutting process.

Please refer to FIG. A cutting tool 1 having multiple twist angles according to the present invention comprises a shank 11 and a blade portion 12. The tip of the blade portion 12 forms a long groove in the blade portion 12 with at least two twist angles θ 1 and θ 2. And any torsion angle θ1, θ2 has a different inclination angle. Therefore, the thickness of the drill hole center is clearly different. Speaking from the center line, the angle between the twist angle θ1 and the twist angle θ2 is in order from the largest to the smallest. Furthermore, the area of the groove also increases gradually. In the blade portion 12, the grooves formed gradually increase from the cutting edge 121 toward the twist angles θ 1 and θ 2. Therefore, the amount of chip discharge is sufficient, and the situation in which the chip is stuck in the hole and the drill breaks is reduced.

  Further, the twist angles θ1 and θ2 of the blade portion 12 are different in depth and angle at every step when manufactured on a lathe. For this reason, the thickness at the center of the drill hole also gradually increases from the cutting edge 121 toward the rear. Therefore, the cutting tool 1 has high rigidity and is less likely to break during the cutting process. Furthermore, the precision of a drill hole becomes higher because rigidity becomes high.

  Please refer to FIG. 4 and FIG. This cutting tool 1 'is another embodiment. This cutting tool 1 'comprises a shank 11' and a blade portion 12 '. At the tip of the blade portion 12 ', at least three twist angles θ3, θ4 and θ5 constitute a long groove of the blade portion 12'. And every torsion angle θ3, θ4, θ5 has a different inclination angle. Therefore, the thickness of the drill hole center and the width of the twist angle are obviously different. The twist angle of the blade portion 12 'gradually decreases from θ3, θ4 to θ5. Therefore, the capacity of the chip is also relatively increased, and the situation where the drill hole is blocked or broken is reduced and improved. And the precision of a drill hole also becomes high. Furthermore, when drilling the multi-layered plate 3, it is possible to avoid a situation where the drill hole 4 is biased due to insufficient rigidity of the cutting tool 1 ′, and the rate at which defective products are produced during drilling can be kept low. is there.

Table 1 shows a comparison of the accuracy when the drills of the cutting tool (A) according to the present invention and the conventional cutting tool (B) having a single helix angle are actually drilled.
From the comparison table of the accuracy of the above two types of holes and the cutting of multiple stacked plate materials, the cutting tool (A) with multiple twist angles of the present invention is surely a conventional cutting tool with a single twist angle ( B) It becomes clear that there is no phenomenon that the drill breaks with better accuracy.

It is an external view of the conventional cutting tool. It is the figure which showed the state of the hole after the conventional cutting tool cut | disconnected several board | plate material. It is an external view of the cutting tool of the present invention. It is an external view of another cutting tool of this invention. It is the figure which showed the state of the hole after cutting the board | plate material with which the cutting tool of this invention accumulated two or more.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cutting tool 101 Shank 102 Blade part 103 Inclination angle 1, 1 'Cutting tool 11, 11' Shank 12, 12 'Blade part 121, 121' Cutting edge (theta) 1, (theta) 2, (theta) 3, (theta) 4, (theta) 5 Inclination angle 3,3 'Sheets 4, 4' Drilled hole diameter

Claims (1)

It consists of a shank and a blade part, and the blade part forms a helix angle spirally from the cutting edge,
The blade part forms a groove with a long torsion angle of at least two steps, and since the inclination angle is different for every twist angle, the angle of the twist angle between the front and rear stages of the blade part gradually decreases. As a result, the area of the groove also gradually increases, and therefore, the amount of chip discharge is sufficient, and it is difficult to cause a situation where the chip is clogged and block the diameter of the hole. Cutting tool with horns.