DE896037C - Method of manufacturing fastening screws - Google Patents
Method of manufacturing fastening screwsInfo
- Publication number
- DE896037C DE896037C DEL8825A DEL0008825A DE896037C DE 896037 C DE896037 C DE 896037C DE L8825 A DEL8825 A DE L8825A DE L0008825 A DEL0008825 A DE L0008825A DE 896037 C DE896037 C DE 896037C
- Authority
- DE
- Germany
- Prior art keywords
- thread
- fastening screws
- screw
- free
- cutting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/027—Rolling of self-tapping screws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Description
Die Erfindung :betrifft ein Verfahren zur Herstellung vonBefestigungsschrauben,die zumSelbstschneiden von Gewinde an der Schraubenspitze mit gewindefreien: Flächen versehen sind, die sich über wenige Gewindegänge erstrecken und durch Abarbeiten des Schaftes erzeugt werden, wobei die Flächen nach der Schraubenspitze hin keilförmig gegeneinandergeneigt sind.The invention: relates to a method of manufacturing fastening screws which for self-cutting threads at the screw tip with thread-free: surfaces are provided that extend over a few threads and by processing of the shank, the surfaces being wedge-shaped towards the screw tip are inclined towards each other.
Es ist vorgeschlagen worden, die Flächen .durch Schleifen zu erzeugen, wobei man inder Weise vorgegangen ist, daß man zunächst das Gewinde herstellte und dann den mit Gewinde versehenen Schraubenbolzen zur Erzeugung der gewindefreien Flächen durch Schleifen weiter bearbeitete.It has been suggested to create the surfaces by grinding, where one proceeded in such a way that one first made the thread and then the threaded studs to create the unthreaded Surfaces further processed by grinding.
Die Erfindung schlägt vor, nicht wlie bisher erst das Gewinde zu schneiden und dann die Flächen anzuarbeiten, sondern umgekehrt zunächst die Flächen zu bilden, vorzugsweise durch Abfräsen, und dann das Gewinde zu erzeugen, und zwar :durch spanlose Verformung, insbesondere durch Rollen.The invention proposes not cutting the thread as before and then to work on the surfaces, but vice versa first to form the surfaces, preferably by milling, and then generating the thread, namely: by non-cutting Deformation, especially due to rolling.
Dies hat gegenüber dem bisherigen Herstellungsverfahren den Vorteil, daß sich bei spanlo:sem Verformen @die Gewindegangenden etwas umlegen und die gewindefreien Flächen Überkragen, also -die Spitzen zusätzliche Schneid-spitzen bilden. Ein Versuch hat bestätigt, :daß derartige Schrauben sich leichter in nicht mit Gewinde versehenen Bohrungen, selbst bei Gußeisen, einschrauben lassen. Die Schneidwirkung wird: noch erhöht, wenn der Schraubbolzen selbst bzw. :das Gewinde nach dem freien Ende hin konisch verjüngt wird.This has the advantage over the previous manufacturing process, that with spanlo: sem deformation @ the thread turns turn over and the thread-free Surfaces overhang, i.e. the tips form additional cutting tips. One try has confirmed: that such screws fit more easily into unthreaded Let the holes screw in, even with cast iron. The cutting effect will be: still increased if the screw bolt itself or: the thread towards the free end is tapered conically.
Zur Erläuterung,der Erfindung ist ein Schraubenbolzen in den Fig. i und 2, in einer Seitenansicht und in :einer Ansicht auf die Spitze in Richtung des in Fig. i eingetragenen Pfeiles ,dargestellt. Fig. 3 ist ein Teilschnitt nach .der Linie I-I in vergrößertem Maßstäbe.To explain the invention, a screw bolt is shown in Figs. i and 2, in a side view and in: a view of the tip in the direction of the arrow entered in Fig. i. Fig. 3 is a partial section according to . of line I-I on an enlarged scale.
Die Befestigungsschraube i hat eine konisch verjüngte Spitze 2. 3 sind die gewindefreien Flächen, deren längs verlaufende Kanten die Schneidkanten der Schraube bilden.The fastening screw i has a conically tapered tip 2. 3 are the thread-free surfaces, the longitudinal edges of which are the cutting edges the screw form.
Die Herstellung erfolgt in- der Weise, daß an dem glatten, noch nicht mit Gewinde versehenen Bolzen zunächst die Flächen 3 abgearbeitet, insbesondere abgefräst werden. Dann wird :das Gewinde gerollt. Bei diesem Verformungsvorgang werden sich, wie in Fig. 3 in vergrößertem MaBstabe dargestellt ist, die Spitzen der an den Schneidkanten der Flächen 3 auslaufenden Gewindegänge etwas umlegen und .die Flächen. 3 Überkragen, wodurch jeder Gewindegang eine kleine Schneidspitze aufweist.The production takes place in such a way that on the smooth one, not yet threaded bolts first processed the surfaces 3, in particular be milled off. Then: the thread is rolled. During this deformation process the peaks will become, as shown in Fig. 3 on an enlarged scale the thread turns tapering off at the cutting edges of the surfaces 3 a little and .the surfaces. 3 collar, creating a small cutting point for each thread turn having.
Würde zunächst das Gewinde geschnitten und dann die Flächen abgearbeitet, so würden sich ,die Gewindegangspitzen nicht,- wie in Fig. 3 :dargestellt ist, umlegen können.If the thread would first be cut and then the surfaces would be processed, so, the thread peaks would not, - as shown in Fig. 3: is shown, fold over can.
Es. ist für die Erfindung gleichgültig, ob wie bei dexnAusführungsbeispielzwei gewindefreieFlächen3 vorgesehen sind oder eine andere Anzahl.It. It is irrelevant for the invention whether, as in the case of the dexn embodiment example, two thread-free surfaces 3 are provided or a different number.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL8825A DE896037C (en) | 1951-04-21 | 1951-04-21 | Method of manufacturing fastening screws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL8825A DE896037C (en) | 1951-04-21 | 1951-04-21 | Method of manufacturing fastening screws |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE896037C true DE896037C (en) | 1953-11-09 |
Family
ID=7257726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL8825A Expired DE896037C (en) | 1951-04-21 | 1951-04-21 | Method of manufacturing fastening screws |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE896037C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3183531A (en) * | 1961-10-04 | 1965-05-18 | G K N Screw & Fasteners Ltd | Method of forming a screw with cutting edges |
| DE1195263B (en) * | 1961-12-30 | 1965-06-24 | Altenloh Brinck & Co | Device for the production of wood screws from preformed blanks with a reduced diameter of the threaded shaft part |
| US3218656A (en) * | 1962-04-30 | 1965-11-23 | Nat Lock Co | Method of forming a self-tapping or thread-forming screw |
-
1951
- 1951-04-21 DE DEL8825A patent/DE896037C/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3183531A (en) * | 1961-10-04 | 1965-05-18 | G K N Screw & Fasteners Ltd | Method of forming a screw with cutting edges |
| DE1195263B (en) * | 1961-12-30 | 1965-06-24 | Altenloh Brinck & Co | Device for the production of wood screws from preformed blanks with a reduced diameter of the threaded shaft part |
| US3218656A (en) * | 1962-04-30 | 1965-11-23 | Nat Lock Co | Method of forming a self-tapping or thread-forming screw |
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