CN202155571U - Stepped flat drill - Google Patents

Abstract

The utility model relates to a stepped flat drill, which comprises a knife blade (1) and a knife handle (2) which are integrally molded, wherein the knife handle is a cylindrically straight handle; the knife blade is stepped; a transition part is arranged between the knife blade and the knife handle; the bottom end of the transition part is equipped with a circular truncated cone; a chip removal groove (3) of the flat drill is formed at the transition place from the circular truncated cone to the front surface of the knife blade; the knife blade is four-leveled, and a first level, a second level, a third level and a fourth level are arranged starting from the top end of the knife blade respectively; the width of the knife blade is gradually increased from the first level; a cutting edge of the knife blade is arranged on the edge of each level of the knife blade; wherein an edge tip (4) is arranged at the top end of the first level of knife blade; and an edge tip angle of the edge tip (4) is 120 degrees. The stepped flat drill is large in chip removal space, smooth in chip removal and long in service life; in addition, the knife blade is stepped and can machine four stepped holes with different diameters at a time without resetting a knife, so that machining precision and work efficiency are greatly increased.

Description

Step moulding chit drill

Technical field

The utility model relates to a kind of hole machining tool, particularly a kind of step moulding chit drill.

Background technology

At present, on workpiece, carry out coaxial stepped hole and add man-hour, generally need to use many cutter; Mill out the different hole of diameter respectively, in the process, not only need change cutter; Also need tool setting again, waste time and energy, production efficiency is lower; And owing to error certainly will occur in the tool setting process again, the hole coaxiality deviation that processes is bigger, and machining accuracy is lower.And drill bit of the prior art occurs the bit freezing phenomenon because the chip removal space is little through regular meeting, causes workpiece and drilling bit breakage.

The utility model content

The purpose of the utility model is to overcome above-mentioned technical deficiency, but provides that a kind of one-shot forming four coaxial stepped holes, chip removal space are big, precision and the high chit drill of efficient.

The technical scheme that the utility model technical solution problem is adopted is:

A kind of step moulding chit drill; Comprise integrated blade and handle of a knife, said handle of a knife is a cylindrical staight shank, and said blade is step; Be provided with a transition part between blade and the handle of a knife; It is a round platform that said transition part gets the bottom, is the chip area of this chit drill by round platform to blade rake face transition position, and said blade is the level Four formula; Rise by the blade top and to be respectively the first order, the second level, the third level, the fourth stage; Its width is risen step by step by the first order and increases, and the cutting edge of said blade is arranged on the edge of blades at different levels, wherein; First order blade top has a blade tip, the blade tip angle of said blade tip be 120

.

The beneficial effect of the utility model is: 1. this chit drill chip removal space is big, and chip removal is unobstructed, long service life.2. this spade drill blade is step-like, but time processing goes out four different stepped holes of diameter, need not tool setting again, and machining accuracy and operating efficiency improve greatly.

Description of drawings

Fig. 1 is the stereogram of the utility model chit drill.

The specific embodiment

Embodiment is referring to Fig. 1.

A kind of step moulding chit drill of present embodiment; Comprise integrated blade 1 and handle of a knife 2, said handle of a knife is a cylindrical staight shank, and said blade is step; Be provided with a transition part between blade and the handle of a knife; It is a round platform that said transition part gets the bottom, is the chip area 3 of this chit drill by round platform to blade rake face transition position, and said blade is the level Four formula; Rise by the blade top and to be respectively the first order, the second level, the third level, the fourth stage; Its width is risen step by step by the first order and increases, and the cutting edge of said blade is arranged on the edge of blades at different levels, wherein; First order blade top has a blade tip 4, the blade tip angle of said blade tip 4 be 120

.

The chip removal space of present embodiment step moulding chit drill is big, and chip removal is unobstructed, long service life.Its blade is step-like, but time processing goes out four different stepped holes of diameter, need not tool setting again, and machining accuracy and operating efficiency improve greatly.

Claims (1)

1. a step moulding chit drill is characterized in that, comprises integrated blade (1) and handle of a knife (2); Said handle of a knife is a cylindrical staight shank; Said blade is step, is provided with a transition part between blade and the handle of a knife, and it is a round platform that said transition part gets the bottom; By round platform to blade rake face transition position is the chip area (3) of this chit drill; Said blade is the level Four formula, is worked being respectively the first order, the second level, the third level, the fourth stage by the blade top, and its width is risen step by step by the first order and increases; The cutting edge of said blade is arranged on the edge of blades at different levels; Wherein, first order blade top has a blade tip (4), the blade tip angle of said blade tip (4) be 120

.

Images