DE725881C - Enforcement punch for making a blind hole in metal parts - Google Patents
Enforcement punch for making a blind hole in metal partsInfo
- Publication number
- DE725881C DE725881C DES144113D DES0144113D DE725881C DE 725881 C DE725881 C DE 725881C DE S144113 D DES144113 D DE S144113D DE S0144113 D DES0144113 D DE S0144113D DE 725881 C DE725881 C DE 725881C
- Authority
- DE
- Germany
- Prior art keywords
- blind hole
- metal parts
- making
- punch
- enforcement
- 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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K23/00—Making other articles
Description
Durchsetzstempel zur Herstellung eines Sackloches in Metallteilen Beim kalten Herstellen eines Sackloches in Metallteilen, dessen geschlossenes Ende in Näpfchenform über den Ausgangswerkstoff vorspringt, im Durchsetzverfahren mit- Hilfe von Stempeln mit gerundeter Stirnfläche findet leicht ein Auf- bzw. Abreißen statt.Enforcement punch for making a blind hole in metal parts When cold making a blind hole in metal parts, its closed end protrudes in the form of a cup over the base material, in the enforcement process with With the help of stamps with a rounded end face it can easily be torn open or torn off instead of.
Diese zu erheblichen Mengen von Ausschuß führende Erscheinung wird gemäß vorliegender Erfindung überraschenderweise dadurch beseitigt, daß man der Stirnseite des Stempels flache Py ramidenform gibt. Die günstige Wirkung dieser Form dürfte sich dadurch erklären, daß die Spitze und die Seitenkanten der Pyramide keilartig in das Arbeitsgut eindringen und es leichter als eine abgerundete Fläche, die im Gipfelpunkt einen sich sehr stark einer OOuerebene annähernden Teil aufweist, nach außen hin verschieben.This phenomenon will lead to significant amounts of scrap according to the present invention surprisingly eliminated by the fact that The face of the stamp gives a flat pyramid shape. The beneficial effect of this Form should be explained by the fact that the top and the side edges of the pyramid penetrate the work material like a wedge and make it easier than a rounded surface, which at the summit has a part that very closely approaches an OOuereplane, move outwards.
Die Zeichnung veranschaulicht die Erfindung an einem Ausführungsbeispiel.The drawing illustrates the invention using an exemplary embodiment.
Fig. i zeigt den Durchsetzstempel in schräger Aufsicht auf seine Stirnseite, Fig. 2 zeigt ihn in Tiefstellung im Werkstück, daß ebenso wie die Matrize in einer durch die Achse des Stempels gehenden Ebene geschnitten ist.Fig. I shows the enforcement punch in an oblique view of its end face, Fig. 2 shows it in the lower position in the workpiece that just like the die in a is cut through the plane going through the axis of the punch.
Die Stirnseite b des Durchsetzstempels a ist zu flacher vierseitiger Pyramidenform angeschliffen. Mit c ist das Werkstück, mit cl sein becherförmig durchgesetzter Teil, mit ä die die Außenform des durchgesetzten Teiles bestimmende Matrize bezeichnet. Gestricheit ist eine Zwischenstellung des Stempels und i die entsprechende Zwischenform des Werkstückes angedeutet.The end face b of the clinching punch a is ground to a flat four-sided pyramid shape. With c the workpiece, with cl its cup-shaped penetrated part, with ä the die which determines the outer shape of the penetrated part. The dashed line indicates an intermediate position of the punch and i the corresponding intermediate shape of the workpiece.
Beim Durchsetzvorgang schiebt der Stempel den seinem Querschnitt entsprechenden Teil i des Werkstoffes des Werkstückes vor sich her und verdrängt dabei einen Teil von ihm nach den Seiten hin zur Bildung der Becherwand. Dieser Verdrängungsvorgang wird durch die Keilwirkung der Spitze und der Kanten der Pyramide begünstigt.During the enforcement process, the punch pushes the one corresponding to its cross-section Part i of the material of the workpiece in front of it and displaces a part in the process from it to the sides to form the cup wall. This process of repression is favored by the wedge effect of the top and the edges of the pyramid.
In Fällen, in denen die Pyramidenform der Innenfläche des Bodens des durchgesetzten Werkstückteiles unerwünscht ist, kann man durch Nachpressen mit einem am Ende gerundeten Stempel eine kantenfreie Endform erzielen.In cases where the pyramidal shape of the inner surface of the bottom of the enforced workpiece part is undesirable, you can press with a achieve an edge-free end shape with a rounded punch at the end.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES144113D DE725881C (en) | 1941-02-21 | 1941-02-21 | Enforcement punch for making a blind hole in metal parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES144113D DE725881C (en) | 1941-02-21 | 1941-02-21 | Enforcement punch for making a blind hole in metal parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE725881C true DE725881C (en) | 1942-10-01 |
Family
ID=7542057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES144113D Expired DE725881C (en) | 1941-02-21 | 1941-02-21 | Enforcement punch for making a blind hole in metal parts |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE725881C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE935879C (en) * | 1951-01-19 | 1955-12-01 | Canadian Patents Dev | Drive head for milling machines |
| US2909281A (en) * | 1954-05-19 | 1959-10-20 | Chrysler Corp | Closed end sleeve-like boss and method of making |
| US6915676B2 (en) * | 2001-12-13 | 2005-07-12 | Nakamura Seisakusho Kabushikigaisha | Method of forming a protruded shaft for an electronic memory device |
-
1941
- 1941-02-21 DE DES144113D patent/DE725881C/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE935879C (en) * | 1951-01-19 | 1955-12-01 | Canadian Patents Dev | Drive head for milling machines |
| US2909281A (en) * | 1954-05-19 | 1959-10-20 | Chrysler Corp | Closed end sleeve-like boss and method of making |
| US6915676B2 (en) * | 2001-12-13 | 2005-07-12 | Nakamura Seisakusho Kabushikigaisha | Method of forming a protruded shaft for an electronic memory device |
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