DE188126C

DE188126C -

Info

Publication number: DE188126C
Application number: DENDAT188126D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

KLASSE 67a. GRUPPECLASS 67a. GROUP

PAUL BEIER in KARLSRUHE i.B.PAUL BEIER in KARLSRUHE i.B.

Patentiert im Deutschen Reiche vom 11. August 1906 ab.Patented in the German Empire on August 11, 1906.

. Gegenstand der Erfindung ist eine Maschine zum Schleifen der Schneiden von Spiralbohrern derjenigen Art, bei welcher der Hinterschliff der Bohrerschneidlippen an der Umfläche einer umlaufenden Schmirgelscheibe durch Schwenken des Bohrers um zwei in parallelen Ebenen liegende Achsen erzeugt wird, deren eine fest steht und deren andere um die erste in einem Kreisbogen geführt wird.. The invention relates to a machine for grinding the cutting edges of twist drills of the type in which the relief of the drill cutting lips on the surface of a rotating emery disk by pivoting the drill by two in parallel planes horizontal axes is generated, one of which is fixed and the other of which is around the first in one Arc is guided.

ίο Die Maschine unterscheidet sich von den bisher bestehenden durch die besondere Bauart des Bohrerhalters und durch die Führung desselben. ίο The machine is different from the previously existing due to the special design of the drill holder and the leadership of the same.

Die Maschine ist auf der Zeichnung in Fig. ι im Aufriß und in Fig. 2 im Grundriß dargestellt. Fig. 3 zeigt schematisch den Verlauf der Bohrerbewegung. Fig. 4 ist ein Schnitt durch den Bohrerhalter, und Fig. 5 zeigt einen Schnitt durch den Arm 2 mit dem Träger 3 usw.The machine is shown on the drawing in Fig. Ι in elevation and in Fig. 2 in plan. Fig. 3 shows schematically the course of the drill movement. Fig. 4 is a section through the drill holder, and Fig. 5 shows a section through the arm 2 with the carrier 3 etc.

Die Maschine besteht im wesentlichen aus drei Hauptteilen: a) dem Lagerbock mit der die Schmirgelscheibe 1 und die Schnurrolle tragenden und in einem Lagerzapfen und einer Spitze laufenden, zwar einstellbaren, aber während des Schleif ens nicht verschiebbaren Spindel, b) dem gelenkartigen Arm 2 des Trägers 3 und c) det Bohrerzange 4 mit ihrer Hülse 11.
Der Träger 3 ist um eine Achse A drehbar und kann zwischen den Anschlägen 9 und 10 pendeln. Die Zange 4 ist in der Hülse 11 drehbar gelagert und wird in dieser durch einen Federbolzen 12 festgestellt. Die Hülse 11 ist im Träger 3 um Zapfen B drehbar gelagert. Die Bohrerhülse 11 ist mit dem Arm 2 durch einen Gleitzapfen 14, der ebensogut durch eine Gleitrolle ersetzt werden kann, die Leitschiene 15 und durch die Feder 16 verbunden. Letztere erhält die Berührung der Teile 14 und 15 aufrecht. Der Arm 2 ist an seinem Ende gegabelt und in der Arbeitsstellung mit den Gabelschenkein über einen am Maschinengestell drehbar gelagerten Bolzen 6 geschoben. Die Muttern 7 und 8 und eine Feder 13 sichern den Arm 2 auf dem Bolzen 6. Nach Abschwenken des Gelenkbolzens 6 kann folglich der Arm 2 aus der Arbeitsstellung zurückgeschwenkt werden.The machine essentially consists of three main parts: a) the bearing block with the spindle carrying the emery disk 1 and the line roller and running in a bearing pin and a point, adjustable but not displaceable during grinding, b) the articulated arm 2 of the Carrier 3 and c) the drill pliers 4 with their sleeve 11.
The carrier 3 can be rotated about an axis A and can oscillate between the stops 9 and 10. The pliers 4 are rotatably mounted in the sleeve 11 and are fixed therein by a spring bolt 12. The sleeve 11 is rotatably mounted about pin B in the carrier 3. The drill sleeve 11 is connected to the arm 2 by a sliding pin 14, which can just as easily be replaced by a sliding roller, the guide rail 15 and by the spring 16. The latter maintains contact between parts 14 and 15. The arm 2 is forked at its end and, in the working position, is pushed with the fork legs over a bolt 6 rotatably mounted on the machine frame. The nuts 7 and 8 and a spring 13 secure the arm 2 on the bolt 6. After pivoting the pivot bolt 6, the arm 2 can consequently be pivoted back from the working position.

Der Bohrer wird je nach seiner Größe von hinten oder von vorn in die Zange 4 eingesteckt und mittels Mutter 5 festgeklemmt, wobei das eine Zangenrnaul für ungeübte Arbeiter mit einer Zeigerzunge versehen werden kann, um die richtige Lage des Bohrers zu sichern. Beim Schleifen der schwächeren Bohrer wird ein Winkel in die Bohrerzange 4 eingelegt, damit die Bohrermitte mit der HülsenmitteThe drill is inserted into the pliers 4 from the rear or from the front, depending on its size and clamped by means of nut 5, one of which is a pair of pliers for inexperienced workers can be provided with a pointer tongue to ensure the correct position of the drill. When grinding the weaker drills an angle is inserted into the drill pliers 4 so that the center of the drill corresponds to the center of the sleeve

Claims

always coincides. However, a centric clamping chuck can also be used instead of the pliers. If the drill is inserted from the front, the guide screw 6 with the adjusting nut 7 and the tightening nut 8 as well as the articulated arm 2 are knocked back for convenience. If the articulated arm 2 is in its working position and the drill holder carrier 3 is inclined to the left against the stop 9, then the drill begins to be sharpened by moving the carrier 3 by means of its handle to the right. The drill, swinging in a circular arc around axis A and axis B, strokes with an upward movement and a slight forward movement of the cutting edge on the surface of the emery disk 1 due to the sliding of the pin 14 on the rail 15 and due to the inclined position of the axis A to the grinding spindle until the drill holder 3 leans against the stop 10. The course of this movement is indicated in Fig. 3 by dash-dotted lines. With larger or blunt drills, the movement of the carrier 3 forwards and backwards between the stops 9 and 10 must be repeated several times and at the same time the drill bit must be pressed against the emery disk by means of the tightening nut 8 until it has obtained its correct cutting edge. The nut 7 is now placed against the fork end of the arm 2 and thus determines the amount of pressure for the second cutting edge. The grinding of the same takes place after the drill in the pliers 4 has been rotated 180 ° in the sleeve 11 and fixed by the spring bolt 12 of the same. The grinding of this second cutting edge takes place in the manner described. The precisely S3; rmmetric design of both cutting edges is secured by the stop nut 7. The spring 13 on the guide screw 6 makes it possible to knock the latter back and forth without the nuts 7 and 8 having to be adjusted. The hinge screw 17 of the arm 2 is threaded, and both the desired cutting angle can be set by the two nuts 18, as well as the wear of the emery stone by further slackening one and tightening the other of these nuts can be taken into account. Patent-A ν Proverbs:

1. Twist drill grinding machine, in which the relief of the drill cutting lips on the surface of a rotating grinding wheel is produced by pivoting the drill about two axes lying in parallel planes, one of which is fixed and the other of which is guided around the first in an arc of a circle, characterized in that the drill holder sleeve (11) for the drill pliers (4), which can be switched in a known manner by 180 ° and can be locked by a spring bolt (12), rotatably mounted in a carrier (3) oscillating between stops (9, 10) and by guide pins (14), guide rail (15) and tension spring (16) is connected to an arm (2) connected to the machine frame, so that when the carrier (3) is pivoted about its axis (A) inclined to the spindle, the drill collet sleeve (11) oscillates about its axis (B) and thereby the cutting edge of the drill receives an ascending and forward motion.

2. Embodiment of the machine according to claim 1, characterized in that one end of the arm (2) carrying the carrier (3) for the drill holder is articulated and adjustably connected to the machine frame by means of screws (17) and nuts (18) is and at its other forked end between an adjusting nut (7) on the one hand, a spring (13) and tightening nuts (8) on the other hand, a screw bolt pivotably arranged on the machine frame in the plane of the articulated arm (2) (6) is held so that after the latter has been pushed back, the articulated arm (2) including the grinding device from the grindstone or the sanding disc (1) swiveled away and thus set both the desired cutting edge angle and the abrasion of the emery stone Can be taken into account.

1 sheet of drawings.