Method for producing a through hole in a metallic body

Abstract

The invention relates to a method for producing g a through-hole (10) in a metallic body (12), which has at least one curved surface, by means of a reciprocating movement, said through-hole (10) being produced by means of high speed shearing cutting (HGSS).

Claims

1. A method for producing a through hole in a metallic body, the method comprising: placing the metallic body that comprises a triangular cross-section with three corners, wherein at least one of the three corners is a rounded corner and wherein a material thickness of the metallic body is measured from a connecting line of the two corners opposite said rounded corner to a tip of said rounded corner, onto a die; carrying out a stroke movement with a plunger by high-speed impact cutting (HSIC) to cut adiabatically the through hole with a hole diameter through the metallic body from said rounded corner transversely to the connecting line of the two corners with a ratio of the hole diameter relative to the material thickness of equal to or greater than 0.92 and less than 1.5.

2. The method according to claim 1, further comprising selecting the material thickness of the metallic body to be 6.9 mm to 7.5 mm and selecting the hole diameter of the through hole to be 6.9 mm to 7.5 mm.

3. The method according to claim 1 , wherein an adiabatic state is generated even for stroke movement speeds of less than 10 m/s.

4. The method according to claim 3, further comprising selecting the stroke movement speed to be 6 m/s to 8 m/s.

5. The method according to claim 4, wherein the stroke movement speed is 7 m/s.

6. The method according to claim 1, further comprising producing an inner thread within the through hole.

7. The method according to claim 1, wherein the metallic body is a sliding block.

8. The method according to claim 7, further comprising producing a blind bore in the sliding block.

9. A method for producing a through hole in a metallic body, the method comprising: placing the metallic body that comprises a triangular cross-section with three corners, wherein at least one of the three corners is a rounded corner and wherein a material thickness of the metallic body is measured from a connecting line of the two corners opposite said rounded corner to a tip of said rounded corner, onto a die; carrying out a stroke movement with a plunger by high-speed impact cutting (HSIC) to cut adiabatically the through hole with a hole diameter through the metallic body from said rounded corner transversely to the connecting line of the two corners with a ratio of the hole diameter relative to the material thickness of less than 1.5.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages and features of the invention result from the following description of an embodiment as well as from the drawings to which reference is being had. It is expressly noted that the description is based on the manufacture of a sliding block but is not limited in any way to this embodiment. It is shown in:

(2) FIG. 1 two cross-sections of a sliding block provided with a through hole; and

(3) FIG. 2 a sequence schematic for producing the through hole as well as a further final machining for a sliding block with blind bore.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) With the aid of FIGS. 1 and 2, the manufacture or the method for producing a through hole 10 within, in this case, a metallic sliding block 12 that naturally has a curved surface will now be explained. It is again noted that the description of a sliding block is only an example because this method according to the invention can of course also be used for other metallic bodies with curved surfaces.

(5) As can be seen schematically in the illustration of FIG. 2, this through hole 10 is produced by means of a stroke movement of a plunger 11 wherein in this context high speed impact cutting (HSIC) is used, beginning at the highest projecting point 14a of the curved surface of the sliding block 12 resting on die 13. The cross-section of the metallic body 12 is essentially triangular and comprises at least one rounded corner 14a . The through bore 10 extends from the at least one rounded corner 14a transversely to the connecting line of the two other corners, 14b , 14c.

(6) The stamped-out material 12a is then subsequently fed to a collecting site.

(7) The through hole 10 can have a hole diameter D of 6.9 mm to 7.5 mm and likewise a material thickness s of 6.9 mm up to 7.5 mm.

(8) With this method, for a material thickness s of 7.3 mm a hole diameter D of 7.4 mm was produced.

(9) This is a ratio D/s for adiabatic production of approximately 1.

(10) In the described embodiment, a stroke speed of less than 10 m/s, preferably of 7 m/s, was used.

(11) Since the through hole for a sliding block 12 of course serves to receive a screw thread, this through hole 10 is also provided with an inner thread.

(12) Since the sliding block 12 for comfortable assembly may also be provided with a spring-loaded ball at the site of highest bulge, it is of course also possible to provide this sliding block with a so-called blind bore 10a (FIG. 1). This also is performed with a method producing an adiabatic state as set forth in the simultaneously filed and pending patent application by the same applicant filed on Feb. 5, 2013 DE 10 2013 001 918.4).

(13) By means of the method according to the invention, it is now possible to provide in a much shorter period of time a metallic workpiece or a sliding block with a through hole.