CN2629882Y - Drilling bit - Google Patents

Abstract

The utility model relates to a drilling bit, which comprises a drillstock, a drill body and an alloy bit and is characterized in that the end of the drilling body forms the ladder-shaped diameter expanding area; the alloy bit is fastened on the diameter expanding area; the diameter expanding area can be in single-ladder shape, double-ladder shape or multi-ladder shape. The utility model overcomes the defect of the prior art that the drilling body diameter of the drilling bit is unified causing large waste of steel material. Through the design, the drilling body part of the drilling bit is divided with different diameter sections, thereby effectively reducing consumption of the steel material. The drilling bit has the advantages of simple structure, safe and reliable use and low production cost.

Description

Drill bit

Affiliated technical field

The utility model relates to a kind of drill bit.

Background technology

Traditional drill bit all comprises drillstock, drill body and alloy head, and the alloy head directly is fastened on the end of drill body.The drill bit of this structure, the diameter difference of its alloy head and drill body is only at 2mm-3mm, as making the drill bit of 25mm diameter, will prepare the drill body of 22mm-23mm diameter, as everyone knows, the diameter difference is controlled at the needs that 2mm-3mm is an assembling alloy head, and the integral body of drill body is all made the significant wastage that the single diameter that is fit to the assembling of alloy head certainly will cause steel.

Summary of the invention

For the drill body diameter that overcomes drill bit in the prior art is unified, cause the problems of a large amount of wastes of steel, the utility model provides a kind of drill bit, this drill bit simple in structure, less relatively, safe and reliable to the consumption of steel.

The technical scheme that its technical problem that solves the utility model adopts is: comprise drillstock, drill body and alloy head, the end of drill body forms stair-stepping diameter expansion district, and the alloy head is fastened in the diameter expansion district.

The diameter expansion district is single-order scalariform, two stepped or multistage scalariform.

The utility model is by above-mentioned design, and the drill body of drill bit partly is divided into different diameter segment, effectively reduced the loss of steel, has advantage simple in structure, safe and reliable, that production cost is low.

Description of drawings

Further illustrate particular content of the present utility model below in conjunction with drawings and Examples.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the right view of Fig. 1.

The specific embodiment

As shown in the figure, the utility model comprises drillstock 1, drill body 2 and alloy head 3, and the end of drill body 2 forms stair-stepping diameter expansion district 4, and alloy head 3 is fastened in the diameter expansion district 4, and diameter expansion district 4 is single-order scalariform, two stepped or multistage scalariform.The diameter of drill body 2 of the present utility model is less than the diameter in diameter expansion district 4, has significantly reduced the loss of steel on the basis that guarantees product quality, has reduced production cost.The shape of drillstock 1 can be designed to circle, square or polygonal as required.

Claims (2)

1, a kind of drill bit comprises drillstock, drill body and alloy head, it is characterized in that the end of drill body (2) forms stair-stepping diameter expansion district (4), and alloy head (3) is fastened in the diameter expansion district (4).

2, drill bit according to claim 1 is characterized in that diameter expansion district (4) is single-order scalariform, two stepped or multistage scalariform.

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