DE102020002778B4 - Device for mounting on a bench grinder or bench grinder for manual sharpening of twist drills type N in sizes from 1.00 to 10.00 mm - Google Patents

Abstract

The device for mounting on a bench grinder or a bench grinder for manual sharpening of twist drills type N in the size of 1.00 to 10.00 mm is characterized in that this device has three components, the support (1), the stop (2 ) and the mounting plate (3), the support (1) being in the form of a cylinder with a 4.00 ± 0.10 mm flat surface, the stop (2) being at an angle of 59 degrees on the mounting plate (3) and wherein the mounting plate (3) has an elongated hole.

Description

• Das Nachschleifen von Spiralbohrern wird erforderlich, wenn Schneiden stumpf oder ausgebrochen sind.

It is known:

• The regrinding of twist drills becomes necessary when cutting edges are blunt or broken off.

• - Die Winkel zwischen den Hauptschneiden, die Spitzenwinkel von 118 Grad eingehalten werden
• - Die Schneiden gerade sein
• - Die Schneiden die gleiche Länge haben
• - Die Schneiden mit der Bohrerachse gleiche Winkel bilden
• - Die Freiflächen richtig hinterschliffen werden
• - Die Querschneiden einen Winkel von 55 Grad mit der Hauptschneide bilden.

In doing so, you must:

• - The angles between the main cutting edges, the point angle of 118 degrees are maintained
• - The cutting edges must be straight
• - The blades have the same length
• - The cutting edges form the same angle with the axis of the drill
• - The free surfaces are properly relief ground
• - The chisel edges form an angle of 55 degrees with the main cutting edge.

The typical requirements for twist drills are known from the table book for metal technology ISBN 3.582.03291.4 4th revised and expanded edition, page 247. Further state of the art for regrinding twist drills is according to the documents DE 74 39 613 U , WO 2009/157 867 A1 and also after the U.S. 46,941 E known, but do not allow regrinding according to the present invention.

The device, with the features according to the patent claim, for the manual sharpening of twist drills type N in the size of 1.00 to 10.00 mm must be mounted on the grinding machine support or on the grinder bench support. The terminal edge of the device, with the features according to the patent claim, must lie flush against the front edge of the grinding machine support or the bench grinder support facing the grinding wheel. The assembly of the device, with the features according to the patent claim, can be done through the mounting plate (3) with a screw clamp, clamp pliers or screw with nut and the stop (2) of the device must end with the outer edge of the grinding wheel on the right, viewed from the front , Like the embodiment according to the 1 until 3 shows.

The twist drill is placed on the support (1) of the device with the features according to claim and aligned parallel to the support of the bench grinder or bench grinder.

The grinding machine support or the bench grinder support must be centered on the diameter of the grinding wheel and, thanks to the device with the features according to the patent claim, the drill is then 1.50 cm above the center of the grinding wheel during the grinding process.

The twist drill must be placed against the stop (2) of the device with the features according to the patent claim.

The first main cutting edge of the twist drill must now be aligned horizontally. Then the twist drill is pushed forwards up to the grinding wheel and then the twist drill shank is pressed down 10 to 30 degrees, depending on the diameter of the twist drill, to grind the clearance angle.

The twist drill is now rotated 180 degrees. The second main cutting edge is now aligned horizontally against the stop (2) of the device with the features according to the patent claim, and the twist drill is pushed onto the grinding wheel, parallel to the grinding machine support or grinder bench support. Then the twist drill shank must be pressed down again by 10 to 30 degrees, depending on the diameter of the twist drill, to grind the clearance angle of the second main cutting edge.

The angle between the two drill bits of 118 degrees is then created automatically by the stop of the device with the features according to the patent claim.

The two main cutting edges must be ground to the same length.

The chisel edge angle of 55 degrees results automatically after performing the above operations.

Claims (1)

The device for mounting on a bench grinder or a bench grinder for manual sharpening of twist drills type N in the size of 1.00 to 10.00 mm is characterized in that this device has three components, the support (1), the stop (2 ) and the mounting plate (3), the support (1) being in the form of a cylinder with a 4.00 ± 0.10 mm flat surface, the stop (2) being at an angle of 59 degrees on the mounting plate (3) and wherein the mounting plate (3) has an elongated hole.

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