U.S. patent application number 15/111627 was filed with the patent office on 2016-11-10 for method for creating through-passages in a metal body by means of high-speed impact cutting.
The applicant listed for this patent is Gerrit Pies, Wolfgang Rixen. Invention is credited to Gerrit Pies, Wolfgang Rixen.
Application Number | 20160325338 15/111627 |
Document ID | / |
Family ID | 52462887 |
Filed Date | 2016-11-10 |
United States Patent
Application |
20160325338 |
Kind Code |
A1 |
Rixen; Wolfgang ; et
al. |
November 10, 2016 |
Method for Creating Through-Passages in a Metal Body by Means of
High-Speed Impact Cutting
Abstract
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stopped and the punch (11) is withdrawn again, and in that in a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).
Inventors: |
Rixen; Wolfgang; (Solingen,
DE) ; Pies; Gerrit; (Solingen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Rixen; Wolfgang
Pies; Gerrit |
Solingen
Solingen |
|
DE
DE |
|
|
Family ID: |
52462887 |
Appl. No.: |
15/111627 |
Filed: |
January 13, 2015 |
PCT Filed: |
January 13, 2015 |
PCT NO: |
PCT/EP2015/000038 |
371 Date: |
July 14, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 53/28 20130101;
B23D 33/00 20130101; B21D 45/003 20130101; B21D 28/14 20130101;
B23D 23/00 20130101; B21D 45/02 20130101 |
International
Class: |
B21D 45/00 20060101
B21D045/00; B21D 45/02 20060101 B21D045/02; B21D 53/28 20060101
B21D053/28; B21D 28/14 20060101 B21D028/14 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 15, 2014 |
DE |
102014 000 299.3 |
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.
Description
[0001] 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.
[0002] 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.
[0003] A method for adiabatic separation of workpieces by means of
high-speed impact cutting (HSIC) is disclosed in DE 103 17 185
A1.
[0004] 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.
[0005] The method described therein is used for cutting to length a
plurality of mentioned profiles (see DE 103 17 185, paragraph
6).
[0006] 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.
[0007] 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 FIG. 12. The break line or
break surface, which results in HSIC by utilizing the adiabatic
material state and is extending underneath the active surface of
the tool in the direction of impulse propagation, scatters
statistically in the direction of the hole and the surrounding
material, as shown in FIG. 5. Due to this scattering, without the
known funnel-shaped breakout, see FIG. 11, observed in conventional
punching, high adhesion forces between punch and through-passage
wall result upon penetration of the HSIC punch and accelerate wear
caused by abrasion. This may result in a reduced service life, in
particular of the punch, in comparison to conventional punching.
Penetration of the punch is required in the current prior art.
[0008] 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.
[0009] 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.
[0010] 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.
[0011] 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.
[0012] 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.
[0013] 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.
[0014] Moreover, it can be provided that the HSIC is carried out
beginning at a curved surface.
[0015] It is also possible that this method is used for producing
through-holes in sliding blocks.
[0016] 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:
[0017] FIG. 1 to FIG. 5 the prior art method for generating a
through-passage in a metal body by means of high-speed impact
cutting HSIC wherein
[0018] FIG. 1 shows the situation prior to impact of the punch;
[0019] FIG. 2 shows the complete break formation of a slug at a
minimal insertion depth;
[0020] FIG. 3 shows further pushing out the slug by means of the
punch at high circumferential pressure;
[0021] FIG. 4 shows retraction of the punch at high friction;
[0022] FIG. 5 shows an enlarged detail view according to FIG. 3
with schematic warping between punch and through-hole.
[0023] FIGS. 6 through 10 now show the improved method and FIGS. 11
and 12 show the prior art, wherein
[0024] FIG. 6 shows a view similar to FIG. 2 with already
penetrated punch;
[0025] FIG. 7 shows the position of the retracted punch shortly
after the state according to FIG. 6;
[0026] FIG. 8 shows an ejector introduced into the through-passage
and having a reduced dimension in comparison to the punch;
[0027] FIG. 9 the now completed through-passage wherein however the
ejector 14 has not yet been retracted;
[0028] FIG. 10 a perspective illustration of the method for
generating through-passages wherein here, as the workpiece to be
produced, the so-called slug is designed as a gear;
[0029] FIG. 11 shows a cross-section of a through-hole produced by
conventional punching; and
[0030] FIG. 12 a perspective illustration of a punch with
abrasion.
[0031] With the aid of FIGS. 1 to 12, the known method for
producing a through-passage 10 in a metal body 12 by means of HSIC
and the method for creating a passage 10 with the aid of an ejector
14 will now be explained in more detail. For both methods the same
reference characters are employed, if nothing to the contrary is
indicated.
[0032] In the known method, a punch 11 is impacting at very high
speed on a metal body 12. This is illustrated in FIG. 1 in such a
way that the end face of the punch 11 is shown shortly before
penetrating the surface of the workpiece 12.
[0033] According to FIG. 2, the punch 11 has penetrated slightly
into the metal body 12 and has already completely created a
so-called slug 13 as a result of HSIC. This slug 13 is already
completely separated from the remaining metal body 12. It is
therefore to be noted that already for a minimal insertion depth in
the direction of action of the punch 11 the break between the
materials is existing all the way through the entire body 12.
[0034] Upon further insertion or penetration of the punch 11, the
slug 13 is removed from the body 12. As can be seen in FIGS. 3 to
5, wherein FIG. 5 shows a detail view of FIG. 3, HSIC causes also
wear by adhesion, and as a result thereof by abrasion, in the area
of the tool wall surface, see in particular FIG. 5. The somewhat
corrugated lines between the punch 11 and the body 12 are meant to
schematically indicate the break line which is occurring in HSIC by
utilizing the adiabatic material state, wherein the break line
extends under the active surface of the tool or the punch 11 in the
impulse propagation direction and scatters, considered
statistically, in the direction of the through-hole 10 and of the
surrounding material of the body 12.
[0035] Due to this scattering, without the funnel-shaped breakout
according to FIG. 11 known in conventional punching, high adhesion
forces between the punch 11 and the wall of the through-passage 10
result upon penetration of the punch 11 and accelerate wear due to
abrasion, as shown in FIG. 12.
[0036] 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
[0037] FIGS. 6 and 7 that illustrate generation of the slug 13 and
retraction of the punch 11. In this context, it should be noted
that a first dimension D at the punch 11 corresponds very precisely
to the inner width or diameter of the passage 10.
[0038] In FIG. 8, it can be seen that an ejector 14 with a second
reduced dimension d has pushed the slug 13, generated already upon
short insertion of the punch 11, all the way through the passage 10
and thus has ejected it.
[0039] FIG. 9 shows the end position with removed slug 13 and
completely produced passage 10.
[0040] FIG. 10 shows in an exemplary fashion the generation of the
passage 10 according to the invention (FIG. 4). Here, the slug in
the form of a gear 13 produced by means of HSIC is utilized. The
punches with closed cutting line can be formed in a shape so that,
instead of the slug 13, the metal body 12 that has surrounded it
before forms the workpiece.
[0041] 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
[0042] 10 through-passage [0043] 11 punch [0044] 12 metal body
[0045] 13 slug, gear [0046] 14 ejector [0047] D first dimension
[0048] d second dimension
* * * * *