U.S. patent application number 10/415606 was filed with the patent office on 2004-04-22 for hot metal extru-bending machine.
Invention is credited to Jin, In-Tai.
Application Number | 20040074275 10/415606 |
Document ID | / |
Family ID | 19696657 |
Filed Date | 2004-04-22 |
United States Patent
Application |
20040074275 |
Kind Code |
A1 |
Jin, In-Tai |
April 22, 2004 |
Hot metal extru-bending machine
Abstract
This invention relates to the extru-bending machine that can
bend product by extruding two or more hot metal billets with the
machine which consists of an extrusion die holder equipped with
conical dies, container holder heating the two or more-holed
container with conical plug, two or more extrusion stems, hydraulic
power system unit, relative velocity control unit, and support
frame structure. It is characterized that, when two or more hot
metal billets are welded together inside a conical die cavity and
extruded to one product at the die exit, the extru-bending machine
can bend the extruded part simultaneously during extruding with the
gradient of extrusion velocities on the dies exit owing to the
relative moving velocity of two or more extrusion stems. And it is
possible to manufacture curved metal rods or tubes by the
extru-bending machine without defects such as wrinkling and folding
on the surface, distortion in the section, and thickness change in
the wall.
Inventors: |
Jin, In-Tai; (Nam-ku,
KR) |
Correspondence
Address: |
DORSEY & WHITNEY LLP
INTELLECTUAL PROPERTY DEPARTMENT
4 EMBARCADERO CENTER
SUITE 3400
SAN FRANCISCO
CA
94111
US
|
Family ID: |
19696657 |
Appl. No.: |
10/415606 |
Filed: |
November 3, 2003 |
PCT Filed: |
October 22, 2001 |
PCT NO: |
PCT/KR01/01786 |
Current U.S.
Class: |
72/260 |
Current CPC
Class: |
B21C 35/00 20130101;
B21C 23/12 20130101; B21C 23/01 20130101; B21C 25/08 20130101 |
Class at
Publication: |
072/260 |
International
Class: |
B21C 025/08 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 1, 2000 |
KR |
2000/64631 |
Claims
1. The extru-bending machine which consists of extrusion die holder
(F) equipped with conical dies (4) in which one is able to insert
conical plug (5) for the purpose of bending product while extruding
owing to the difference of moving velocity of each billet when two
or more hot metal billets are welded inside the conical die (4)
cavity and are extruded to one product at the die exit after coming
from the holes of the two or more-holed container (3).
2. The extru-bending machine which consists of a heated container
holder (E) equipped with the two or more-holed container (3)
connected with conical plug (5) for the purpose of bending product
at the die exit while extruding owing to the difference of moving
velocity of two or more extrusion stems inserted in the holes of
the two or more-holed container or owing to the difference of
relative size of two or more holes.
3. The extru-bending machine which consists of constant velocity
stems (1) that can be moved in constant velocity and equipped at
the constant velocity ram-crosshead (B) connected to constant
velocity hydraulic cylinders (A); and which consists of variable
velocity stems (2) that can be moved in different velocities and
equipped at the variable velocity ram-crosshead (D) connected to
variable velocity hydraulic cylinder (C) for the purpose of bending
product at the die exit while extruding owing to the difference of
relative velocity of two or more extrusion stems inserted in the
holes of the two or more-holed container (3).
4. The extru-bending machine which consists of hydraulic power
system unit (I) equipped with flow control valves controlled by
computer in order that the variable velocity ram-crosshead (D)
connected to variable velocity hydraulic cylinder (C) should move
differently from the constant velocity ram-crosshead (B) connected
to constant velocity hydraulic cylinders (A) for the purpose of
bending product at the die exit during the extrusion process.
5. The extru-bending machine which consists of a relative velocity
control unit (H) being able to control the bending direction and
curvature while extruding by making the variable velocity stem (2)
move slower or faster than the constant velocity stems (1) for the
purpose of bending product at the die exit during the extrusion
process.
6. The extru-bending machine which is operated in the method by
which the bending direction and curvature can be controlled by the
difference of relative moving velocity of the variable velocity
stem (2) and the constant velocity stems (1); by the difference of
relative size of two or more holes in the two or more-holed
container (3); by the eccentricity of center of exit and entrance
sections of conical dies (4) and conical plug (5) for the purpose
of bending product at the die exit during the extrusion
process.
7. The extru-bending machine which manufactures curved metal rods
(100) or curved metal tubes (200) with an arbitrary section in
various curvatures by controlling the difference of relative
velocity of the variable velocity stem (2) according to the curved
geometry of product inputted in the computer of the relative
velocity control unit (H).
Description
TECHNICAL FIELD
[0001] This invention relates to the extru-bending machine that can
bend the product by extruding two or more hot metal billets with
the machine which consists of a extrusion die holder equipped with
conical dies, a container holder heating the two or more-holed
container with conical plug, two or more extrusion stems, an
hydraulic power system unit, a relative velocity control unit, and
support frame structure.
[0002] It is characterized that the extru-bending machine can bend
products simultaneously while extruding with the gradient of the
extrusion velocity at the die exit, owing to the difference of
relative moving velocity of two or more extrusion stems, when two
or more hot metal billets are welded together inside the conical
extrusion die cavity and extruded to one product at the die
exit.
BACKGROUND ARTS
[0003] When metal products are extruded by conventional extrusion
machines, it is known that distorted bending may happen owing to
the shape of the extruded section and the position of the die hole.
Accordingly, such distorted bending has been regarded as a defect
and these have been concern about preventing such defects. But, if
the bending could be controlled during the extruding process by
controlling the velocity gradient at the die exit, the extrusion
machines can not only prevent distorted bending but also can take
the place of the function of bending machines which can bend
products with an arbitrary section. Because conventional extrusion
machines have one hole in the container and cannot make uniform
gradients in the moving velocity of the billet in the container, it
is difficult to make and control a uniform velocity gradient at the
die exit for bending. So, it is necessary to invent an
extru-bending machine which has such a structure and function that
can create and change the uniform velocity gradient at the die exit
for the control of the curvature and the direction of bending.
DISCLOSURE OF INVENTION
[0004] The extru-bending machine consists of an extrusion die
holder equipped with conical dies, a heated container holder, a two
or more-holed container with conical plug, two or more extrusion
stems moving at different velocities, an hydraulic power system
unit pushing the extrusion stems, a relative velocity control unit,
and the support frame structure.
[0005] Because the different velocities of two or more extrusion
stems of the extru-bending machine can make a difference in the
moving velocity of two or more billets inserted in the holes of the
two or more-holed container. Accordingly, when two or more hot
metal billets are coming at different velocity from the holes of
the two or more-holed container, they are welded inside the conical
extrusion die cavity and are extruded to one product at the die
exit, and then bending should happen owing to the difference of the
relative velocity of the extrusion stems.
[0006] Then, the bending curvature can be controlled by the
difference of relative velocity of two or more extrusion stems. For
example, when the velocity of one extrusion stem is constant, if
the other symmetric extrusion stem should move fast or slowly, it
can change the curvature or the direction of bending.
[0007] If the curvature of bending could be controlled in order not
to bend while extruding by equalizing the velocity of variable
velocity stem and the velocity of constant velocity stems, it is
possible to get such an effect that can bend straight extruded
metal tubes or rods by a conventional rotational bending machine.
And it is possible to get such results that the extru-bending
machine can bend extruded products without such defects as
distortion of section, thinning of thickness, and wrinkling and
folding on surface that can happen easily when they should be
bended by conventional rotational bending machines.
[0008] On the other hand, the extru-bending machine can also
control the bending curvature by adjusting the difference of
relative size of the holes in the two or more-holed container. For
example, although there is no difference in the relative velocity
of extrusion stems, the machine can extrude and bend curved product
with constant bending curvature by differing the size of holes in
relation to each other.
[0009] The extru-bending machine is characterized by the
arrangement of hydraulic cylinders in order to control the relative
velocity of extrusion stems, in these way: by the number of
extrusion stems, by the structure of the ram-crossheads, and by the
structure of the two or more-holed container that are different
from those of conventional extrusion machines.
BRIEF DESCRIPTION OF DRAWINGS
[0010] The nature and mode of operation of preferred embodiments of
the present invention will now be more fully described in the
following detailed description, taken with the accompanying
drawings wherein:
[0011] FIG. 1 is a perspective overall view of the hot metal
extru-bending machine of the present invention;
[0012] FIG. 2 is a cross-sectional view of the flow of hot metal in
extru-bending process for the curved metal rod;
[0013] FIG. 3 is a cross-sectional view of the flow of hot metal in
extru-bending process for the curved metal tube;
[0014] FIG. 4 is a perspective view of a constant velocity
ram-crosshead and constant velocity stems;
[0015] FIG. 5 is a perspective view of a variable velocity
ram-crosshead and a variable velocity stem;
[0016] FIG. 6 is a perspective view of a heated container holder
equipped with a two or more-holed container and a die holder;
[0017] FIG. 7 is a view of examples of products of curved metal
rods or tubes that can be manufactured by the present
invention.
EXPLANATION OF THE SYMBOL AT THE INDICATED POINT IN THE
DRAWINGS
[0018] 1: constant velocity stem 2: variable velocity stem 3: two
or more-holed container 4: conical dies 5: conical plug 6: right
side billet 7: left side billet A: constant velocity hydraulic
cylinder B: constant velocity ram-crosshead C: variable velocity
hydraulic cylinder D: variable velocity ram-crosshead E: heated
container holder F: extrusion die holder G: support frame structure
H: relative velocity control unit I: hydraulic power system unit
100: curved metal rod 200: curved metal tube
BEST MODE FOR CARRYING OUT THE INVENTION
[0019] For more details of the present invention, exemplary
embodiments of extru-bending process using four extrusion stems and
four-holed container are illustrated in the figures with detailed
description as followings;
[0020] The extru-bending machine consists of constant velocity
hydraulic cylinders (A), a constant velocity ram-crosshead (B), a
variable velocity hydraulic cylinder (C), a variable velocity
ram-crosshead (D), a heated container holder (E), an extrusion die
holder (F), the support frame structure (G), a relative velocity
control unit (H), an hydraulic power system unit (I) in FIG. 1 and
constant velocity stems (1), a variable velocity stem (2), a two or
more-holed container (3), conical dies (4) in FIG. 2 and conical
plug (5) in FIG. 3.
[0021] The extru-bending principle of the present invention is
explained as follows with attached drawings;
[0022] In FIG. 4, when the constant velocity ram-crosshead (B)
which is connected to the ram of the upper and lower constant
velocity hydraulic cylinders (A) moves in constant velocity, the
constant velocity stems (1) connected to the constant velocity
ram-crosshead (B) are moved in constant velocity. Because the
constant velocity stems (1) consists of three extrusion stems of
upper, lower and right sides except for one variable velocity stem
(2) among the four extrusion stems, they are inserted in the three
holes of upper, lower and right sides in the two or more-holed
container (3) when they are moved by the constant velocity
hydraulic cylinders (A).
[0023] In FIG. 5, when the variable velocity ram-crosshead (D)
which connects to the ram of the variable velocity hydraulic
cylinder (C) is moved in variable velocity by the relative velocity
control unit (H), one variable velocity stem (2) which is connected
to variable velocity ram-crosshead (D) can be moved slowly or fast
in variable velocity independently from the constant velocity stems
(1) and it can be slid through the sliding hole of the constant
velocity ram-crosshead (B),
[0024] FIG. 2 is an example of the extru-bending process of curved
metal rod. If the variable velocity stem (2) is moved more slowly
than the constant velocity stem (1), because the left side billet
(7) velocity by the variable velocity stem (2) is moved more slowly
than the velocity of the right side billet (6), the extru-bending
machine can extrude and bend in the direction of left side during
the process of combining and welding the four billets inside
conical die (4) cavity. And then, because there is no difference in
the velocity of the upper and lower extrusion stem, the bending
happens only in the direction of the left side without bending in
the direction of the upper or lower side. Bending curvature and
bending direction can also be controlled by the difference of the
relative velocity of the variable velocity stem (2) and the
constant velocity stem (1).
[0025] FIG. 3 is an example of the extru-bending process of curved
metal tube. If the variable velocity stem (2) is moved more slowly
than the constant velocity stem (1), because the velocity of the
left side billet (7) is moved more slowly than the velocity of the
right side billet (6), the extru-bending machine can extrude and
bend in the direction of the left side during the process of
combining and welding the four billets inside conical dies. And,
because there is no difference in the velocity of the upper and
lower extrusion stems, the bending happens only in the direction of
left side without bending in the direction of the upper or lower
side.
[0026] In contrast, if the variable velocity stem (2) is moved
faster than the constant velocity stem (1), because the velocity of
the left side billet (7) moves faster than the velocity of the
right side billet (6), the extru-bending machine can extrude and
bend in the direction of the right side. And, if the variable
velocity stem (2) is moved at the same velocity as the constant
velocity stem (1), the extru-bending machine can extrude only
straight extruded metal rods or tubes without bending as in
conventional extrusion processes.
[0027] In this way, when straight product is being extruded, if the
velocity of the variable velocity stem (2) is instantaneously fast
or slow, and again, if it is the same velocity as the constant
velocity stem (1), the extru-bending machine can extrude curved
products as in FIG. 7 and can get such effects as being able to
bend by conventional rotational bending machines. And in FIG. 7,
the extru-bending machine can bend extruded products with
complicated sections which are difficult to bend, and products
having various curvatures.
[0028] The velocity control of the variable velocity stem (2) in
order to control bending directions and curvatures can be done by
using the relative velocity control unit (H) connected to the
variable velocity hydraulic cylinder (C) driven by the hydraulic
power system unit (I) with flow control valves controlled by
computer.
[0029] Although the above embodiments are illustrated as desirable
examples of the case of the extru-bending process using four hot
metal billets, with four extrusion stems, and with a four-holed
container, the fulfillment with the technically applicable range of
the present invention can be made in any other case of the
extru-bending process using two or more hot metal billets, with two
or more extrusion stems, and with a two or more-holed
container.
INDUSTRIAL APPLICABILITY
[0030] The present extru-bending machine can be used for bending
the curved rods or tubes while extruding in order to eliminate such
defects as thinning or thickening in the walls of the product,
distortion of the section, and wrinkling or folding on the surface
after bending process.
[0031] This present invention can be classified as a complex metal
forming machine with a new structure and function which is
different from the concept of conventional extrusion machines, and
it can contribute to increase productivity by combining the
extrusion process and the bending process. And, because the machine
can bend products with complicated non-symmetric sections which are
difficult to bend, there can be many applicable fields for
industry.
* * * * *