CN203330466U - Cutting edge front angle structure of single-edge drill point - Google Patents

Abstract

The utility model provides a cutting edge front angle structure of a single-edge drill point, the single-edge drill point is provided with a drill body, one end of the drill body is connected with a drill handle for clamping a processing machine, the drill body is provided with a dead point at the tail end far away from the drill handle, a cutting edge obliquely extends at the dead point, the cutting edge is provided with an edge part, the edge part extends to form an arc-shaped first angular surface at the side close to the drill handle, the edge part extends to form an arc-shaped second angular surface at the side far away from the drill handle, the first angular surface forms a front angle with a vertical line vertical to the edge part through a first tangent line of the edge part, and the front angle is gradually increased from the edge part close to the dead point to the position far away from the dead point, and the angle change amplitude of the rake angle is less than 17 degrees, so that the change quantity of the rake angle of the cutting edge of the drill point is reduced, and the rake angle of the cutting edge close to the static point is improved, so that the cutting capability of each point on the cutting edge is more uniform, and the cutting capability of the cutting edge is improved.

Description

The rake angle structure of the single-edged drill

technical field

The utility model relates to a blade rake angle structure of a single-edged drill, in particular to a single-edged drill whose rake angle variation range is less than 17 degrees, so as to improve cutting ability and drilling accuracy.

Background technique

In the manufacturing process of printed circuit boards, drills are used to carry out the drilling process. Currently, drills have multiple cutting edges, so that the cross-sectional area of the drill is relatively smaller, and the overall strength of the drill is relatively reduced. , this situation will be more serious when it occurs on micro-drills (drilling diameter is less than 0.3mm), so when the related industry is processing the cutting edge of the drill, the rake angle of the cutting edge will be very small near the static point. To increase the cross-sectional area of the drill, the rake angle will be very large away from the static point to increase the cutting ability of the cutting edge. For a double-edged drill, the distribution range of the front angle of the cutting edge is between 2 From 42 degrees to 42 degrees, the range of change is 40 degrees. This method will make the cutting ability of the cutting edge uneven and greatly reduce the accuracy of drilling.

Therefore, how to solve the above-mentioned existing problems and deficiencies is a subject that relevant industry players are eager to research and develop.

Contents of the invention

The main purpose of this utility model is to reduce the variation of the rake angle of the cutting edge of the drill, and increase the rake angle of the cutting edge near the static point, so that the cutting ability of each point on the cutting edge is more uniform, and the cutting edge can be improved. cutting ability.

In order to achieve the above-mentioned purpose, the single-edged drill bit of the present invention has a drill body, one end of the drill body is connected with a drill handle for clamping by the processing machine, and the drill body forms a static point at the end far away from the drill handle, and the static point is inclined There is a cutting edge extending in the direction. The cutting edge has a cutting edge. The cutting edge extends to form an arc-shaped first angle surface near the side of the drill shank. The edge extends away from the drill shank side to form an arc-shaped second angle surface. The first angle surface A rake angle is formed between the first tangent line passing through the blade and the vertical line perpendicular to the blade. The rake angle gradually increases from the blade near the static point to the angle away from the static point, and the angle change range of the rake angle is less than 17 degrees.

In the rake angle structure of the aforementioned single-edged drill, wherein the second angle surface passes through the second tangent of the blade and a vertical line perpendicular to the drill body forms a relief angle, and the relief angle of the blade is a fixed angle.

Compared with the prior art, the utility model adopting the above-mentioned technical solution has the advantages that: since the angle change range of the rake angle of the blade portion is less than 100 degrees, and the relief angle of the blade portion is a fixed angle, the overall change range of the cutting edge is relatively small. Small, more uniform blade thickness helps reduce wear and tear.

Description of drawings

Fig. 1 is a side view of the utility model;

Fig. 2 is the front view of the utility model;

Fig. 3 is a partial side view of the utility model;

Fig. 4 is the partial sectional view of the H-H section line at the point G of Fig. 3;

Fig. 5 is a partial sectional view of line I-I at point G in Fig. 3 .

Explanation of reference signs: 1-drill body; 2-drill shank; 3-static point; 4-cutting edge; 41-blade; 42-first angle surface; 43-second angle surface; A-first tangent ; B-vertical line; C-rake angle; D-second tangent; E-vertical line; F-back angle.

Detailed ways

Please refer to Fig. 1 to Fig. 4, it can be clearly seen from the figure that the single-edged drill bit of the present invention has a drill body 1, and one end of the drill body 1 is connected with a drill shank 2, and the drill body 1 is far away from the drill shank 2 There is a static point 3 formed at the end of the static point 3, and a cutting edge 4 extends obliquely at the static point 3. The cutting edge 4 has a cutting edge 41, and the cutting edge 41 extends near the side of the drill shank 2 to form an arc-shaped first angular surface 42. The cutting edge 41 extends away from the side of the drill shank 2 to form an arc-shaped second angled surface 43, as shown in Figure 3 and Figure 4, the first angled surface 42 passes through the first tangent line A of the cutting edge 41 and the vertical line perpendicular to the cutting edge 41 B forms a rake angle C, and the rake angle C gradually increases from the blade 41 near the static point 3 to the angle away from the static point 3, and the angle change range of the rake angle C is less than 17 degrees, because the utility model has only one blade 41, so the rake angle C of the blade portion 41 close to the static point 3 can be increased without affecting the strength of the drill bit. The cutting ability of the point is relatively uniform. For example, the rake angle C is 28 degrees near the static point 3, and the rake angle C is 44 degrees away from the static point 3. Compared with the prior art, the cutting ability of the cutting edge 41 far away from the static point 3 is roughly It is the same as the prior art, but the cutting capacity near the static point 3 is much higher than that of the prior art, so as to effectively improve the cutting capacity of the blade portion 41 .

Please refer to Fig. 3 and Fig. 5 , it can be clearly seen from the figures that the second tangent D of the second angular surface 43 through the cutting edge 41 and the vertical line E perpendicular to the drill body 1 form a relief angle F, Moreover, the relief angle F of the blade portion 41 is a fixed angle, so the blade portion 41 can effectively reduce the friction generated during drilling, so as to reduce the vibration or overheating that causes the drill bit to break.

Please refer to Fig. 3 to Fig. 5 at the same time, it can be clearly seen from the figure that since the angle change range of the rake angle C of the blade portion 41 is less than 17 degrees, and the relief angle F of the blade portion 41 is a fixed angle, the cutting edge 4 The overall change range is small, and a relatively uniform blade thickness is conducive to reducing loss.

Claims (2)

1. corner structure before the blade of a single-blade drill point, this hog nose needle set has a brill body, bores body one end and is connected with drillstock, and bore body and be formed with a dead point in the end away from drillstock, and the oblique cutting edge that is extended with in dead point place is characterized in that:

This cutting edge has blade, blade is in extend to form the first edged surface of arcuation near the drillstock side, blade is in extend to form the second edged surface of arcuation away from the drillstock side, the first edged surface is by the first tangent line of blade and perpendicular to the formation of blade vertical line, anterior angle is arranged, anterior angle is gradually large towards the angle away from the dead point place near the dead point place by blade, and the angle amplitude of variation of anterior angle is less than 17 degree.

2. corner structure before the blade of single-blade drill point according to claim 1 is characterized in that: this second edged surface forms relief angle is arranged by the second tangent line of blade and vertical line perpendicular to boring body, and the relief angle of blade is fixed angle.

Images