U.S. patent application number 17/047586 was filed with the patent office on 2021-04-22 for grinding device.
The applicant listed for this patent is EGON EVERTZ KG (GMBH & CO). Invention is credited to Egon EVERTZ, Jacques-Olivier LAMBERT, Jean-Louis MAURICE, Gilles SCHWIRTZ.
Application Number | 20210114169 17/047586 |
Document ID | / |
Family ID | 1000005347906 |
Filed Date | 2021-04-22 |
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United States Patent
Application |
20210114169 |
Kind Code |
A1 |
LAMBERT; Jacques-Olivier ;
et al. |
April 22, 2021 |
GRINDING DEVICE
Abstract
A device for grinding a continuously cast product, in particular
a slab (11), a billet or a block. The Device has at least one
rotationally operated abrasive disk (10), which is attached to a
grinding head (15). At least one high-pressure air nozzle (14) is
arranged on the grinding head (15). The high-pressure air nozzle
blows the continuously cast product free of particles adhering to
or lying on the continuously cast product prior to grinding.
Inventors: |
LAMBERT; Jacques-Olivier;
(Orange, FR) ; MAURICE; Jean-Louis;
(Malancourt-La-Montagne, FR) ; SCHWIRTZ; Gilles;
(Bridel, LU) ; EVERTZ; Egon; (Solingen,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
EGON EVERTZ KG (GMBH & CO) |
Solingen |
|
DE |
|
|
Family ID: |
1000005347906 |
Appl. No.: |
17/047586 |
Filed: |
April 12, 2019 |
PCT Filed: |
April 12, 2019 |
PCT NO: |
PCT/DE2019/100336 |
371 Date: |
October 14, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B24B 7/075 20130101;
B24B 55/06 20130101 |
International
Class: |
B24B 55/06 20060101
B24B055/06; B24B 7/07 20060101 B24B007/07 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 24, 2018 |
DE |
10 2018 109 804.9 |
Claims
1. A device for grinding a continuously cast product, the device
comprising: a grinding head; at least one grinding wheel configured
to be rotatingly operated the at least one grinding wheel being
fastened to the grinding head; and at least one high-pressure air
nozzle, which clears particles adhering to or lying on the surface
of the continuously cast product before a grinding operation, the
at least one high-pressure air nozzle being arranged on the
grinding head.
2. A device in accordance with claim 1, further comprising another
high-pressure air nozzle to provide at least two high-pressure air
nozzles with the high-pressure air nozzles arranged on the grinding
head on both sides of the grinding wheel or in the grinding wheel,
so that at least one of the high-pressure air nozzles, which blows
away particles before the grinding operation, can be operated in
case of a change in grinding direction.
3. A device in accordance with claim 1, wherein the nozzle is
arranged in relation to the grinding wheel such that the nozzle
both blows away particles before the grinding operation and is used
for the immediate blowing away of developing grinding dust.
4. A device in accordance with claim 1, wherein the high-pressure
air nozzle generates an air pressure of at least 2.times.10.sup.5
Pa.
5. A device in accordance with claim 1, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 100 m/sec.
6. A device in accordance with claim 2, wherein the nozzle is
arranged in relation to the grinding wheel such that the nozzle
both blows away particles before the grinding operation and blows
away grinding dust developing during the grinding operation.
7. A device in accordance with claim 2, wherein the high-pressure
air nozzle generates an air pressure of at least 2.times.10.sup.5
Pa.
8. A device in accordance with claim 3, wherein the high-pressure
air nozzle generates an air pressure of at least 2.times.10.sup.5
Pa.
9. A device in accordance with claim 1, wherein the high-pressure
air nozzle generates an air pressure of from 5.times.10.sup.5 Pa to
12.times.10.sup.6 Pa.
10. A device in accordance with claim 2, wherein the high-pressure
air nozzle generates an air pressure of from 5.times.10.sup.5 Pa to
12.times.10.sup.6 Pa.
11. A device in accordance with claim 3, wherein the high-pressure
air nozzle generates an air pressure of from 5.times.10.sup.5 Pa to
12.times.10.sup.6 Pa.
12. A device in accordance with claim 2, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 100 m/sec.
13. A device in accordance with claim 3, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 100 m/sec.
14. A device in accordance with claim 4, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 100 m/sec.
15. A device in accordance with claim 1, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 200 m/sec.
16. A device in accordance with claim 2, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 200 m/sec.
17. A device in accordance with claim 3, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 200 m/sec.
18. A device in accordance with claim 4, wherein the high-pressure
air nozzle is configured as a flat blast nozzle and/or is
configured for discharging air with an air outlet velocity of at
least 200 m/sec.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a United States National Phase
Application of International Application PCT/DE2019/100336, filed
Apr. 12, 2019, and claims the benefit of priority under 35 U.S.C.
.sctn. 119 of German Application 10 2018 109 804.9, filed Apr. 24,
2018, the entire contents of which are incorporated herein by
reference.
TECHNICAL FIELD
[0002] The present invention pertains to a device for grinding a
continuously cast product, in particular a slab, a billet or a
block, with at least one grinding wheel, which is operated in a
rotating manner and is fastened to a grinding head.
TECHNICAL BACKGROUND
[0003] Semifinished products made of steel, in particular in the
form of steel slabs, which are manufactured in a slab
continuous-casting plant, can be processed with such grinding
devices. Such slabs are, as a result, cuboid. The slab coming from
the casting operation has production-related surface defects, which
are, for example, in the form of grooves, furrows, cracks or other
undesired inclusions.
[0004] Various processes, such as scarfing, milling or grinding are
proposed for surface processing.
[0005] Scarfing has the drawback that melted-off material cannot
again be melted down without treatment because of the high oxygen
content. A surface treatment by means of milling is therefore
proposed in EP 2 032 285. As a drawback in this case, hot milling
chips develop, which have to be conveyed away from the work area.
In addition, the plain-milling cutters or face-milling cutters used
have to be cooled in order to prevent overheating of the milling
cutters, which would lead to a considerable wear. Cooling
lubricants are used for cooling, which make an immediate further
processing of the removed chips impossible. Before such chips are
melted down again, they have to be washed and be separated from the
cooling lubricants; the cooling lubricant has to be disposed of
separately as hazardous waste.
[0006] It has been mentioned in this connection that conveying away
of the chips can be supported by aids such as an air blower or a
water jet, which are arranged behind the milling station. There is
the risk during the grinding that dust or other undesired particles
that adhere to the surface are pressed into the ground surface
during the grinding, which minimizes the quality of the ground
surface. Exhaust units or admissions of cooling water help only to
a limited extent.
SUMMARY
[0007] The present invention pertains to both surface grinding
operations, in which the grinding wheel is moved back and forth in
an oscillating manner vertically to the direction of feed of a
slab, and such grinding devices, in which a grinding arm with a
grinding tool fastened at the end is oriented with its longitudinal
axis and with an acute angle on the order of between 25.degree. to
about 65.degree. to the rotation axis of the grinding wheel. Such
devices are described, for example, in DE 101 48 183 A1. The object
of the present invention is to provide a grinding device, which
performs a grinding operation leading to an improved surface
quality.
[0008] This object is accomplished by a device which is
characterized in that at least one high-pressure air nozzle that
clears particles adhering to or lying on the surface of the
continuously cast product before the grinding operation is arranged
on the grinding head. The advantage of such a grinding device is
that dust particles, metal splinters or other adhering particles
are removed before the grinding stone reaches the processing zone
in question. In particular, ground-down particles, which are harder
than (slab) steel, are blown away from the grinding wheel, as a
result of which these particles are not pushed into or pressed into
the slab surface during the grinding. The high-pressure air nozzle
or nozzles is/are integrated with the grinding head, so that due to
this mounting, the distance of the grinding wheels to the
high-pressure air nozzle and the direction of spraying thereof can
be set in a fixed manner and remains unchanged even in case of a
movement of the head for guiding the grinding wheel. Special
disposal problems such as in case of the use of cooling lubricants
or other liquids or structurally complicated devices for collecting
liquid coolant are not necessary. The surface quality of the
material to be ground being treated can be improved considerably
due to the clearing of the semifinished product surface before the
grinding. In contrast to milling operations in which chips
accumulate which then have to be disposed of, the blown-away
grinding dust can be disposed of in a considerably easier manner,
for example, by suction.
[0009] According to another embodiment of the present invention,
two or more high-pressure air nozzles are arranged on the grinding
head on both sides of the grinding wheel or of each grinding wheel,
so that at least one high-pressure air nozzle, which blows away
particles before the grinding operation, can be operated in case of
a change in grinding direction. In this manner, a grinding
operation which moves back and forth in an oscillating manner is
also possible without retrofitting the grinding head. The
application of pressure during the grinding can take place by means
of the same control that also introduces the change in direction
during the grinding. Existing high-pressure air nozzles can be fed
alternately from one and the same compressed air source.
[0010] Not only the particles lying on or adhering to the surface
in front of the grinding wheel, but also the grinding dust
developing during the grinding, can preferably be immediately blown
away by using a flat blast nozzle.
[0011] The pressures used are preferably at least 2 bar
(2.times.10.sup.5 Pa), in particular between 5 bar and 120 bar
(5.times.10.sup.5 Pa to 12.times.10.sup.6 Pa). According to another
embodiment of the present invention, the air outlet velocity at the
nozzle is at least 100 m/sec, preferably more than 200 m/sec.
[0012] An exemplary embodiment of the present invention is shown in
the drawings. The various features of novelty which characterize
the invention are pointed out with particularity in the claims
annexed to and forming a part of this disclosure. For a better
understanding of the invention, its operating advantages and
specific objects attained by its uses, reference is made to the
accompanying drawings and descriptive matter in which preferred
embodiments of the invention are illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In the drawings:
[0014] FIG. 1 is a schematic diagram for showing the grinding
treatment of a slab known according to the state of the art;
[0015] FIG. 2 is a schematic diagram according to the present
invention with an additionally used high-pressure air nozzle;
[0016] FIG. 3 is a schematic view of a first embodiment of a
grinding head with a grinding wheel as well as with a single
nozzle; and
[0017] FIG. 4 is a schematic view of a second embodiment of a
grinding head with a grinding wheel and with two mounted
high-pressure air nozzles.
DESCRIPTION OF PREFERRED EMBODIMENTS
[0018] Referring to the drawings, along the arrow 12 in the example
shown until the grinding operation has been performed over the
entire length of the slab. The slab 11 is then moved forward in the
vertical direction towards the longitudinal axis in order to pass
through the next grinding path in the direction of the longitudinal
axis.
[0019] Remaining grinding particles or metal particles or dust
particles as well as defect inclusions on the slab surface are
shown by reference number 13.
[0020] According to the present invention and as can be seen in
FIG. 2, the slab is moved in the direction of the arrow 12 during
the grinding operation. The stationary grinding wheel 10 is located
on a grinding head, not shown, which is additionally used as a
holder for a nozzle 14, which is flattened toward the front side
and forms a nozzle slot, from which air flows under high pressure.
The air stream is directed such that it blows away particles and
dust lying in front of the grinding wheel as well as grinding dust
that is generated by the grinding operation during the abrasion of
the grinding wheel.
[0021] As can be seen in FIG. 3, the grinding wheel 10 as well as
the high-pressure air nozzle 14 are fastened to a grinding head
15.
[0022] The relative direction of forward motion of the grinding
head in relation to the slab 11 is identified by the arrow 16.
[0023] The embodiment according to FIG. 4 differs from the
embodiment described above in that two high-pressure air nozzles
141 and 142 are provided, which are arranged on both sides offset
to the grinding wheel 10 and which are operated alternatingly, so
that the movements of the grinding wheel in relation to the slab
take place in two directions (see double arrow 17). Compressed air
is applied to each high-pressure air nozzle, which in a slightly
offset manner clears unprocessed grinding areas as well as
developing grinding dust. The exiting air flow is identified by
reference number 18.
[0024] While specific embodiments of the invention have been shown
and described in detail to illustrate the application of the
principles of the invention, it will be understood that the
invention may be embodied otherwise without departing from such
principles.
* * * * *