DE1863075U - CARBIDE DRILLS, IN PARTICULAR LABORATORY DRILLS. - Google Patents

Description

G-ebr. Brasseler _? L emg ο i. lip

"Carbide drills., Especially laborToolirer"

The "firing" relates to a hard metal drill, in particular Laboratory drill for machining τοη harder Materials such as chrome-plated steels or other stainless steels Steels. . -

Some of the previously known carbide drills for processing metals, porcelain or the like, the neck and the pres or boring head are made of. Hard * · - -. made of metal. Here, the pres- or drill head is stark.abetzt opposite the neck, so that the Neck is relatively thin when pressures occur, Resistances or the like. Risk of breakage or the head can tear off from the neck. . ■ ..

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Au: | but the hiring is to use a carbide drill, preferably as a laboratory drill that eliminates the above-described deficiencies with a simple design.

According to the firing, with a carbide drill, especially laboratory drills, for machining harder ones Materials such as chrome-nickel steel or the like, an approximately hemispherical cutting head into the. subsequent Neck over, with both parts made from a hard metal piece exist and the diameter of the neck corresponds approximately to the diameter of the cutting head. The purpose is " moderately the necessary soldering point in the area of the thickening of the neck on the shaft. . ■■

The cutting head can, for example, be equipped with six cutting lips ₉ running in the shape of a quarter circle, the cutting edges of which are curved (bent) in a manner known per se. ■■ ".-.. ~

Through the sore throat, and the strong neck shows a such drill has good strength properties »

In the drawing is. a.Example of the hiring: shown. Show it: . _: .;.

Pig, 1. .a rare view of a hard metal " drill with soldered head and neck

2 'is a plan view of the same hard. metal drill ·. "

I have a cylindrical shaft 10 made of steel ^: at one end a cylindrical shaft is soldered on. Neck 11 with cutting head 12-made of hard metal. The neck 11 has a smaller diameter than the shaft 10, but has a gradual transition at the dead point 13. The hemispherical cutting head 12, which is only slightly thickened, adjoins the neck 11 _? . which, for example, has sedahs cutting lips 14, each with a back-ground surface 15. The cutting lips 14 pull from the cross cutting edge 16 quarter

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circular to the largest cutting head diameter and then run with the relief-grinded surfaces .the end. The vertices 1.6a and 16b are the. Pairs of cutting lips laterally offset from one another.

The cutting head 12 runs through its hemispherical Training in the neck 11 over, so that, a strong Neck transition and at the same time a short neck 11, and a thick transition to the shaft 10 is achieved.

The formation of the head 12 and neck 11 guaranteed high stability of the drill, especially against high loads on torsion and / or bending *

Claims (2)

. «Ϊ́ 551 * 117.82 S c ^: hut ζ a η s ρ r ü ο he ϊ 1, -Hard metal drill especially laboratory drill, for Processing of harder materials such as chrome-nickel * - steels or the like, characterized in that 'a & alb- * spherical cutting head in the adjoining Neck, with both parts made of a hard metal * workpiece and the diameter of the neck corresponds approximately to the diameter of the cutting head 2. Carbide drill according to claim 1, characterized in that that the soldering point between hard metal and steel in the area of the siShit since thickening of the Neck lies. ". ■ 3 * hard metal drill according to claims 1 or 2, characterized in that the cutting lips are quarter-circular.