CN2659604Y

CN2659604Y - Bit for low hardness material

Info

Publication number: CN2659604Y
Application number: CN 200320129703
Authority: CN
Inventors: 韩树森
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-22
Filing date: 2003-12-22
Publication date: 2004-12-01
Anticipated expiration: 2013-12-22

Abstract

The utility model relates to a drill bit for low hardness materials, which solves the problems of big cutting resistance and inaccuracy centering of a twist drill in the prior art and comprises two main edges and a back knife face. A slot is arranged on the position near the main edges of a drill point, and extends to the exterior margin of the drill bit along the back knife face from the position near the drill point, and the bottom of the slot is lower than the exterior margin of the drill bit. Because the existence of the slot, the chisel edge of the drill point becomes short, and a sharp angle formed by the two main blades becomes small after using the structure. Thus, the utility model has the advantages of small cutting resistance, easy positioning and hard slippage.

Description

The low-durometer material drill bit

Technical field

The utility model relates to a kind of drill bit, particularly a kind of low-durometer material drill bit.

Background technology

Fluted drill is with good, the broad-spectrum advantage of its versatility a large amount of production and use in worldwide.But, because it is longer that fluted drill knife faces after unbearable place is main by two intersect formed chisel edge, and the formed sharp angle of two main swords of drill bit end is big, make that the cutting resistance of fluted drill is big, centering is inaccurate, particularly when boring large diameter hole for the little low-durometer material of some volumes, often occur skidding, also be very easy to drilled thing is split to brill even pierce with electric hand drill.

Summary of the invention

For overcoming above-mentioned shortcoming, the utility model provides a kind of cutting resistance little, the low-durometer material drill bit that centering is accurate.

The utility model low-durometer material drill bit comprises main sword and back knife face, is provided with groove in the position of described closely unbearable main sword, and described groove is stretched to drill bit outer rim edge along the back knife face by nearly unbearable position, and the bottom of described groove is lower than the outer rim of drill bit.

After adopting this structure, because the existence of groove makes the chisel edge of apex point portion shorten, the formed sharp angle of two main swords is little, so cutting resistance is little, is easy to the location, is difficult for skidding.And, make the outer rim of both sides, drill bit end form second and third tip because channel bottom is lower than the outer rim of drill bit; In use, second and third tip can form annular ditch groove earlier on drilled thing, carry out from infiltrating to the drilling between the outer rim again, so be shaped, drilled thing is difficult for splitting.

Description of drawings

Fig. 1 is the schematic elevational view of the utility model low-durometer material with drill bit.

Fig. 2 is a vertical view of the present utility model shown in Figure 1.

The specific embodiment

With reference to Fig. 1, Fig. 2, a kind of low-durometer material drill bit comprises main sword 1 and back knife face 2, is provided with groove 3 in the position of described nearly unbearable main sword 1, described groove 3 is stretched to drill bit outer rim edge along back knife face 2 by nearly unbearable 1 position, and the bottom of described groove 3 is lower than the outer rim of drill bit.Like this, because the existence of groove 3 makes the chisel edge of apex point portion shorten, two main sword 1 formed sharp angles diminish, so cutting resistance is little, are easy to the location, are difficult for skidding.And, make the outer rim of both sides, drill bit end form second tip 41 and the 3 42 tip because groove 3 bottoms are lower than the outer rim of drill bit; In use, second tip 41 and the 3 42 tip can form annular ditch groove earlier on drilled thing, carry out from infiltrating to the drilling between the outer rim again, so be shaped, drilled thing is difficult for splitting.

In order to make cutting resistance little, as the novel further improvement of this usefulness, the sharp angle that described main tooth shape becomes is less than 90 degree.

Claims

1, a kind of low-durometer material drill bit, comprise main sword and back knife face, it is characterized in that: the position at described closely unbearable main sword is provided with groove, and described groove is stretched to drill bit outer rim edge along the back knife face by nearly unbearable position, and the bottom of described groove is lower than the outer rim of drill bit.

2, low-durometer material drill bit as claimed in claim 1.It is characterized in that: the sharp angle that described main tooth shape becomes is less than 90 degree.