CN202726134U

CN202726134U - Four-blade-belt twist drill

Info

Publication number: CN202726134U
Application number: CN 201220139415
Authority: CN
Inventors: 王玉明; 曾显胜
Original assignee: DALIAN HENGRUI PRECISION MACHINERY Co Ltd
Current assignee: DALIAN HENGRUI PRECISION MACHINERY Co Ltd
Priority date: 2012-04-05
Filing date: 2012-04-05
Publication date: 2013-02-13
Anticipated expiration: 2022-04-05

Abstract

A four-blade-belt twist drill comprises a drill stock and a drill bit body, wherein the drill bit body is arranged at the front end of the drill stock; the front end of the drill bit body is a cone-shaped vertical face and is provided with a first blade part and a second blade part; the front portion of the drill bit body is evenly provided with four spiral blade belts with set angles; and a concave spiral chip groove is formed between every two adjacent spiral blade belts. According to the four-blade-belt twist drill, a special grinding wheel is polished to enable a twist drill to be provided with four blade belts just like a straight fluted drill, and therefore not only can feeding speed be guaranteed, but also high precision and stable cutting effect can be achieved. The four-blade-belt twist drill combines the advantages of the ordinary twist drill and the straight fluted drill.

Description

A kind of four land fluted drills

Technical field

The utility model belongs to the drill bit field, relates to a kind of four land fluted drills.

Background technology

At present, have many kinds to bore the drill bit that stainless steel is used on the market, traditional common spiral bit can satisfy use.

; in the production practices process, use on a large scale along with in producing, find gradually; technology in the past has many deficiencies; on the market, common fluted drill is two lands of two cutting blades now, and straight-flute drill is four lands of two cutting blades; on the result of use; common fluted drill is compared with straight-flute drill, and common fluted drill feed speed can be accelerated, but the precision of size does not but have straight-flute drill good.

The utility model content

The purpose of this utility model provides a kind of four land fluted drills, and this drill bit makes cutting edge sharp by the special flute profile of exploitation, keeps simultaneously the intensity of point of a knife, has reduced greatly the loss of drill bit.

The technical scheme that adopts is:

A kind of four land fluted drills comprise drillstock and bit body, and bit body is installed in the drillstock front end;

The bit body front end is the taper facade, and offers respectively the first blade part and the second blade part at the bit body front end;

The bit body front portion evenly is laid with four with the helical land of set angle, forms the spill helical flute between per two adjacent helical lands;

Above-mentioned bit body inside offers the first interior cold hole and the second interior cold hole with Central Symmetry respectively;

Become 140 ° of angles between the first blade part of above-mentioned bit body front end and the second blade part.

The utility model has the advantages that:

The utility model makes fluted drill equally become four lands with straight-flute drill by the special emery wheel of reconditioning, so both can guarantee feed speed, can realize high accuracy again simultaneously, and cutting effect is stable, combines the advantage of common fluted drill and straight-flute drill.

Description of drawings

Fig. 1 is overall structure schematic diagram of the present utility model.

Fig. 2 is band angle overall structure schematic diagram of the present utility model

The specific embodiment

A kind of four land fluted drills comprise drillstock 1 and bit body 2, and bit body 2 is installed in drillstock 1 front end;

Bit body 2 front ends are the taper facade, and offer respectively the first blade part 3 and the second blade part 4 at bit body 2 front ends;

Bit body 2 front portions evenly are laid with four with the

helical land

5,6,7,8 of set angle, form spill helical flute 9 between per two adjacent helical lands;

Above-mentioned bit body 2 inside offer the first interior cold hole 10 and the second interior cold hole 11 with Central Symmetry respectively;

Become 140 ° of angles between the first blade part 3 of above-mentioned bit body 2 front ends and the second blade part 4.

Claims

1. a land fluted drill comprises drillstock (1) and bit body (2), and bit body (2) is installed in drillstock (1) front end, it is characterized in that:

Bit body (2) front end is the taper facade, and offers respectively the first blade part (3) and the second blade part (4) at bit body (2) front end;

Bit body (2) is anterior evenly to be laid with four helical lands with set angle (5,6,7,8), forms spill helical flute (9) between per two adjacent helical lands;

Above-mentioned bit body (2) inside offers the first interior cold hole (10) and the second interior cold hole (11) with Central Symmetry respectively.

2. a kind of four land fluted drills according to claim 1 is characterized in that: become 140 ° of angles between first blade part (3) of described bit body (2) front end and the second blade part (4).