Method for Creating Through-Passages in a Metal Body by Means of High-Speed Impact Cutting
The invention relates to a method for creating through-passages in a metal body by means of high-speed impact cutting (HSIC) with a closed cutting line, characterized in that a punch (11) having a first dimension (D) corresponding to the through-passages is introduced down to an insertion depth at which the break passes through the entire metal body in the direction of action of the punch (11), forming a slug (13), and then the stroke movement is stopped and the punch (11) is withdrawn again, and in that in a subsequent step the slug (13), which is still located in the through-passage, is driven out of the through-passage by means of an ejector, which has a smaller second dimension than the punch (11).
The invention concerns a method for creating through-passages in a metal body by means of high-speed impact cutting with closed cutting line, referred to in the following as HSIC.
The produced products may be contour bodies that are punched out of the metal body or through-passage shapes. The metal body can be flat or uneven or can have a curved surface.
A method for adiabatic separation of workpieces by means of high-speed impact cutting (HSIC) is disclosed in DE 103 17 185 A1.
This publication discloses a method for producing profiled parts by separation from profiled rods. In this context, the profiled rod is clamped in a tool between two active parts wherein the facing contact side of the active parts is designed in the form of dies in which the shape of the profile to be processed is cut out, respectively. Moreover, the sizes of the contact sides have the dimensions of the profiled part to be cut. Finally, the separation is carried out adiabatically at a very high impact speed of the cutting punch wherein the force is transmitted by means of the punch onto one active part.
The method described therein is used for cutting to length a plurality of mentioned profiles (see DE 103 17 185, paragraph 6).
Accordingly, this concerns exclusively the separation of profiled members that are not provided with bores. In particular, there are also no through-passages provided in this context.
As in conventional punching, wear occurs also in HSIC in the area of the tool wall surface due to adhesion and, as a result thereof, due to abrasion, as shown in
It is therefore an object of the invention to improve a method of the aforementioned kind in such a way that the service life, in particular of the punch, can be significantly increased with technically simple means.
This is realized in the method of the aforementioned kind in that a punch, having first dimensions corresponding to the through-passages, is introduced to an insertion depth at which the break in the direction of action of the punch extends all the way through the entire metal body with formation of a slug, the stroke movement is then stopped, and the punch is retracted again, and in that, in a subsequent step, the slug which is still located within the through-passage is driven out of the through-passage by means of an ejector that has a smaller second dimension compared to the punch.
The gist of the present invention resides in modifying the previously known method for punching by means of HSIC such that the actual generation of the through-passage and the ejection of the slug are carried out separate from each other.
Therefore, a method is proposed in which a particular property of HSIC is utilized. As described above, the break is extending already through the complete workpiece cross-section already at minimal punch insertion depth. Therefore, the actual generation of the hole is already completed to such an extent that the corresponding materials are separated from each other. As soon as this point has been reached, the stroke movement of the punch is stopped, and the punch is retracted. In a subsequent method step, within the same tool, or separate therefrom, the slug that is still located in the through-passage is pushed out by means of an ejector. The latter has in comparison to the actual punch a smaller dimension so that no contact at all exists between its wall surface and the wall of the punched hole or through-passage. Accordingly, the increased wear of the punch by adhesion is avoided.
According to a further embodiment of the invention, it is advantageous that the ejector performs its stroke movement simultaneously with the punch and with the same drive. Accordingly, punch and ejector can operate simultaneously. However, it can also be provided that the at least one ejector carries out its stroke movement independent of the stroke movement of the punch. In this way, it becomes possible to employ remote from the machine a further machine that requires significantly reduced power.
It is particularly advantageous when the slug itself is the product to be produced or the through-passage itself that has been opened by the slug imparts the desired contour to the product to be produced.
Moreover, it can be provided that the HSIC is carried out beginning at a curved surface.
It is also possible that this method is used for producing through-holes in sliding blocks.
Further advantages and features of the invention result from the following description of several embodiments as well as from the drawings to which reference is being had. It is shown in:
With the aid of
In the known method, a punch 11 is impacting at very high speed on a metal body 12. This is illustrated in
According to
Upon further insertion or penetration of the punch 11, the slug 13 is removed from the body 12. As can be seen in
Due to this scattering, without the funnel-shaped breakout according to
In the now improved method of the aforementioned method for punching by means of HSIC, the actual generation of the through-passage 10 and the ejection of the slug 13 are separated from each other. This is apparent from
In
By means of the method according to the invention, it is now possible to provide in a much shorter time a metal workpiece with a through-passage and to increase the service life of the tool.
LIST OF REFERENCE CHARACTERS
- 10 through-passage
- 11 punch
- 12 metal body
- 13 slug, gear
- 14 ejector
- D first dimension
- d second dimension
Claims
1-6. (canceled)
7. A method for creating through-passages in a metal body by high-speed impact cutting (HSIC) with a closed cutting line, the method comprising:
- introducing a punch, comprising a first dimension that corresponds to a dimension of a through-passage to be produced, with a stroke movement to an insertion depth into a metal body, wherein at the insertion depth a break in a direction of action of the punch exists through the entire metal body and a slug is formed in a through-passage;
- stopping the stroke movement of the punch;
- retracting the punch;
- driving the slug out of the through-passage with an ejector, wherein the ejector comprises a second dimension that is smaller compared to the first dimension of the punch.
8. The method according to claim 7, wherein the ejector performs a stroke movement simultaneously with the punch.
9. The method according to claim 8, comprising driving the ejector and the punch with the same drive.
10. The method according to claim 7, wherein the ejector performs a stroke movement independent of the stroke movement of the punch.
11. The method according to claim 10, comprising driving the punch with a first drive and driving the ejector with a second drive.
12. The method according to claim 7, wherein the slug is a product to be produced.
13. The method according to claim 12, wherein the slug is a gear.
14. The method according to claim 7, wherein the through-passage that is produced by removing the slug from the metal body imparts a desired contour to a product to be produced.
15. The method according to claim 7, wherein the metal body has a curved surface and the punch is introduced via the curved surface.
16. The method according to claim 7, wherein the through-passage is a through-hole of a sliding block.
Type: Application
Filed: Jan 13, 2015
Publication Date: Nov 10, 2016
Inventors: Wolfgang Rixen (Solingen), Gerrit Pies (Solingen)
Application Number: 15/111,627