WO2003055630A1

WO2003055630A1 - Circular saw assembly for cutting metal plates

Info

Publication number: WO2003055630A1
Application number: PCT/KR2002/000055
Authority: WO
Inventors: Young-Hyun Kim; Hong-Ki Kim
Original assignee: Sinjin Sm Co., Ltd.
Priority date: 2001-12-28
Filing date: 2002-01-14
Publication date: 2003-07-10
Also published as: JP4133827B2; CN1607986A; TW522067B; KR20020023910A; AU2002225482A1; JP2005512834A; CN100409987C; KR100431752B1

Abstract

A circular saw assembly for cutting metal plates without shaking even at a high-speed rotation includes a circular saw blade (200) rotating at a high speed by a rotary shaft to cut the metal plates, a casing (110, 111) for covering and supporting the circular saw blade (200) so that the circular saw blade (200) is partially exposed outside, at least one sliding support (130) mounted at an inner side of the casing (110, 111) to contact both sides of the circular saw blade (200), a through hole (131) being formed at the sliding support (130) to discharge lubricant supplied through a lubricant pipe (50a) to a surface contacted with the circular saw blade (200), and a biasing means mounted to the casing (110, 111) for biasing the sliding support (130) to pressurize the circular saw blade (200).

Description

CIRCULAR SAW ASSEMBLY FOR CUTTING METAL PLATES

TECHNICAL FIELD

The present invention relates to a circular saw assembly for

cutting metal plates, and more particularly to a circular saw assembly,

which may cut metal plates without shaking even at a high-speed

rotation by supporting a circular saw blade with pressurization of a

biasing means.

BACKGROUND ART

In these days, a band sawing machine or an oxygen-cutting

method is commonly used for cutting metal materials such as a steel

plate. The band sawing machine cuts the metal material by moving a

band saw with rotation of a pulley. This band sawing machine is

advantageous for curve cutting, but it has a difficulty to cut a stainless

steel due to the work hardening, or a steel alloy with high hardness. In

addition, the band saw is not suitable for cutting the metal plate

because of its very low cutting speed.

The oxygen cutting is a method of cutting a metal by using the

oxidation reaction with the metal. When injecting high-pressure

oxygen with a high degree of purity after preheating the metal with an

oxygen-acetylene gas flame at about 800~900°C, the metal becomes iron oxide owing to abrupt combustion. This iron oxide has a low

melting point, so being melted and cut at the same time by the injected

oxygen. However, since this oxygen cutting needs such chemical

reaction, there sometimes arises problems that chrome oxide(Cr₂O3) or

aluminum oxide having a high melting point is generated during cutting

stainless steel or aluminum, which is not easily cut. Moreover, in case

of carbon steel, there inconveniently needs an additional softening

process because the carbon steel becomes hardened during the cutting

procedure.

First of all, in case of the band saw and the oxygen cutting, there

is much loss of the material because a lost portion during the cutting

process reaches at about 3~5mm in thickness of a mother plate, its

uneven cut section should be finished by following mechanical

processing, and at least 10~ 15mm should be spared for the finishing

process.

As another method of cutting a metal material, there is used a

circular saw blade. Such a circular saw blade employs a tungsten

carbide tip having excellent cutting ability and abrasion resistance, and

its cutting speed is very high about 90~ 150m/min. However, the

conventional circular saw blade cannot cut a large-scale metal plate due

to its mechanical and structural weakness, but it is used to cut various

section parts such as rail, ring-shaped rod, steel tube or the like. In order to cut the metal plate with the conventional circular saw blade,

the circular saw blade should be made with a special material and

provided with a large-scale reducer for absorbing and regulating any

shake or vibration, which is inevitably generated during the cutting

process. But, in spite of those, the conventional circular saw blade

does not ensure its durability and work stability, so being easily worn

and broken.

DISCLOSURE OF INVENTION

The present invention is designed to overcome such problems of

the prior art. An object of the invention is to provide an improved

circular saw assembly, which may cut metal plates rapidly and easily by

securely supporting both sides of a circular saw blade, which rotates for

cutting, with a biasing means.

In order to accomplish the above object, the present invention

provides a circular saw assembly for cutting metal plates, which

includes a circular saw blade rotating at a high speed by a rotary shaft

to cut the metal plates, a casing for covering and supporting the

circular saw blade so that the circular saw blade is partially exposed

outside, sliding supports mounted at an inner side of the casing to

contact both sides of the circular saw blade, a through hole being

formed at the sliding supports to discharge lubricant supplied through a lubricant pipe to a surface contacted with the circular saw blade, and

a means mounted to the casing for biasing the sliding support to

pressurize the circular saw blade.

Preferably, the biasing means may be mounted only to one side of

the circular saw blade.

In addition, the biasing means may include a cylinder block

mounted to the casing for being supplied with hydraulic pressure from

a hydraulic pump, and a movable member installed to the cylinder

block for being movable in a predetermined distance, in which the

movable member biases the sliding support by pressurization when the

hydraulic pressure is supplied thereto.

In another embodiment, the biasing means may include an elastic

member for biasing the sliding support by pressurization toward the

circular saw blade.

At this time, the biasing means may further include an

adjustment screw screwed in a screw hole formed at the casing so as to

adjust elasticity of the elastic member.

In the above configuration, the casing may include a fixed casing

fixed installed, and a cover casing combined by a hinge to the fixed

casing.

Also, preferably, an air injector may be installed at the casing for

supplying air to a cut portion of the metal plates. According to the present invention, a conventional circular saw

blade may be adopted as it is, and more improved durability and work

stability can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present

invention will become better understood with regard to the following

description, appended claims, and accompanying drawings, in which

like components are referred to by like reference numerals. In the

drawings:

FIG. 1 is a schematic perspective view showing an outer

appearance of a cutting apparatus to which a circular saw assembly

according to a preferred embodiment of the present invention is

adopted,

FIG. 2 is an exploded perspective view showing a part of the

circular saw assembly according to the preferred embodiment of the

present invention,

FIG. 3 is a side sectional view showing a part of the circular saw

assembly according to the preferred embodiment of the present

invention,

FIG. 4 is a side sectional view showing a circular saw assembly

according to another embodiment of the present invention, and FIG. 5 is a side sectional view showing a circular saw assembly

according to still another embodiment of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will

be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic appearance of a cutting apparatus,

which adopts a circular saw assembly according to a preferred

embodiment of the present invention. Referring to FIG. 1, the cutting

apparatus includes a table 10 acting as a main body base, and a guide

support 20 mounted on the table 10.

A cutting unit 30 is mounted to the guide support 20 along a

guide rail 21 for reciprocating. The cutting unit 30 is for cutting metal

plates, and a circular saw assembly 100 according to the present

invention is installed thereto. And the cutting unit 30 has a driving

motor 31 for providing driving force, required for cutting, to the circular

saw assembly 100 through a transmission belt 32.

And, the cutting apparatus in this embodiment may have a

hydraulic pump 40 for supplying hydraulic pressure to the circular saw

assembly 100 through a hydraulic pipe 40a, a lubricant supply pump

50 for supplying lubricant through a lubricant pipe 50a, and an air

supply pump 60 for supplying high-pressure air to an air injector 80 through an air pipe 60a.

A fixed stand 11 prepared on the table 10 gives a place on which

a metal plate is placed to be cut. This fixed stand 11 fixes and

supports the metal plate together with a movable fixing member 12.

The movable fixing member 12 is preferably driven by a cylinder 13 to

reciprocate for fixing or releasing the metal plate to be cut.

And, a hole 10a may be formed on the table 10 at a position

under the circular saw assembly 100 so that scraps generated during

the cutting process of the metal plates are not piled up on the table but

fall down through the hole 10a.

Reference numeral 70 is a control panel for inputting and

controlling various work conditions such as a cutting distance, a driving

speed of the cutting apparatus, etc..

The circular saw assembly 100 has a circular saw blade 200 for

rotating to cut the metal plate according to the present invention, which

is shown in FIG. 2 in more detail. Referring to FIG. 2, the circular saw

assembly according to the preferred embodiment of the present

invention includes a casing, constituted with a pair of cover casing 100

and fixed casing 111. The casings 110, 111 are combined by a hinge

112, in which, preferably, the fixed casing 111 is fixedly secured to a

main body of the cutting apparatus and the cover casing 110 is screwed

through a combining hole 113 to the fixed casing 111, so being openable. Though the casing is explained to be separated into the

cover casing and the fixed casing, it is just one preferable example, not

limited, and it should be understood that the casing may be alternated

with any one, which can cover and support the circular saw blade 200.

In the casings 110, 111, the circular saw blade 200 is mounted to

a rotary shaft 120, and its end, preferably a lower end is exposed under

the casings 110, 111 to contact with the metal plate to be cut, as

described below. The circular saw blade 200 is preferably made with,

such as, cemented carbide. The rotary shaft 120 is connected to an

axis of the driving motor 30 through the transmission belt 32, shown in

FIG. 1, so as to receive the rotation force. Though not shown in the

drawings, the rotation force of the driving motor 30 can be transmitted

to the rotary shaft 120 through another power transmission means

such as a gear train or a pulley.

According to the preferred embodiment of the present invention,

the circular saw assembly is provided with a sliding support 130

contacting with and supporting a side of the circular saw blade 200.

Preferably, the sliding support 130 is also made with the cemented

carbide and its configuration is well shown in FIG. 3.

Referring to FIG. 3 together, the sliding supports 130 are

respectively mounted to insides of the cover casing 110 and the fixed

casing 111 for contacting with and supporting both sides of the circular saw blade 200 in operation.

Inside the sliding support 130, a passage 132 is formed for the

lubricant to flow. This passage 132 communicates with a through hole

131 formed at a surface of the sliding support 130. Therefore, when

the sliding support 130 comes in contact with the circular saw blade

200, the lubricant supplied through the lubricant pipe 50a from the

lubricant supply pump 50 passes through the passage 132 and then is

discharged through the through hole 131, so reducing friction force

between the sliding support 130 and the circular saw blade 200. For

supplying the lubricant, the lubricant pipe 50a is connected up to the

inner sliding support 130 through a hole 110a formed at the casings

110, 111.

According to the present invention, the sliding support 130 is

pressurized to become contacted with the side of the circular saw blade

200 by a biasing means. Such a biasing means is exemplarily shown

in FIG. 3.

As shown in FIG. 3, the biasing means may be a hydraulic

cylinder 140 combined with the sliding support 130. More specifically,

the hydraulic cylinder 140 includes a cylinder block 141 having an

inner space for supplying hydraulic pressure therein, and a movable

member 142, which reciprocates within a predetermined distance

according to the hydraulic pressure. The inner space of the cylinder block 141 is connected to the hydraulic pump 40 through the hydraulic

pipe 40a so as to receive the hydraulic pressure therefrom. Therefore,

if the hydraulic pressure is supplied to the cylinder block 141, the

movable member 142 pressurizes the sliding support 130 toward the

circular saw blade 200.

Preferably, the hydraulic cylinders 140 acting as the biasing

means are installed to both sides of the circular saw blade 200, more

preferably, symmetrically with respective the rotary shaft 120.

According to another embodiment of the present invention, the

biasing means may be installed to any one side of the circular saw

blade 200. That is, as shown in FIG. 4, one sliding support 130 is

provided with the hydraulic cylinder 140 as the biasing means, while

the other sliding support 130' is directly fixed to the casing 111 without

any hydraulic cylinder. However, because the hydraulic cylinder 140

installed at one side pressurizes the circular saw blade 200, this

embodiment may obtain same effects as the former embodiment in

which two hydraulic cylinders are prepared to both side of the circular

saw blade.

Referring to FIG. 2 again, the casings 110, 111 is provided with

the air injector 80 to inject high-pressure air, supplied through the air

supply pipe 60a, to a cut portion through an inject pipe 81 when

cutting the metal plate with the circular saw blade 200. Such injected air acts roles of cooling the cut portion as well as removing scraps

generated during cutting.

Now, a metal plate cutting process using the circular saw

assembly of the present invention as constructed above is described.

First, a metal plate (not shown) to be cut is placed upon the fixed

stand 11 on the table 10, and then the cylinder 13 is driven to advance

the movable fixing member 12 for the purpose of fixing the metal plate.

In this state, a worker controls work speed or rotational frequency

on the control panel 70 as desired, and then operates the cutting

apparatus. Then, the driving motor 31 rotates, and this rotation is

transmitted to the rotary shaft (120 in FIG. 2) through the transmission

belt 32 so that the circular saw blade 200 becomes rotated at a high

speed.

At the same time, if the hydraulic pressure is supplied from the

hydraulic pump 40 through the hydraulic pipe 40a to the cylinder block

141 of the hydraulic cylinder 140, the movable member 142 advances

by the hydraulic pressure, so pressurizing the sliding support 130

toward the circular saw blade 200. Preferably, such hydraulic

pressure may be automatically adjusted minutely.

In addition, the lubricant is supplied to the passage 132 in the

sliding support 130 through the lubricant pipe 50a from the lubricant

supply pump 50, and this lubricant is then discharged through the through hole 131 to a friction surface between the sliding support 130

and the circular saw blade 200. Therefore, though the sliding support

130 pressurizes the circular saw blade 200 in contact, the circular saw

blade 200 may rotate smooth.

Besides, the high-pressure air is supplied from the air supply

pump 60 through the air pipe 60a to the air injector 80, and this

high-pressure air is then injected through the inject pipe 81 to a cut

portion for the purpose of cooling the cut material and removing cut

scraps.

In this state, the cutting unit 30 slowly advances along the guide

support 20, and the circular saw blade 200 cuts the metal plate.

In FIG. 5 showing still another embodiment of the present

invention, another example of the biasing means is depicted. Referring

to FIG. 5, the biasing means in this embodiment biases the sliding

support 130 toward the circular saw blade 200 by using an elastic

member 142' such as a spring.

More preferably, this biasing means forms a screw hole 110 'a at

the cover casing 110' and has an adjustment screw 141' combined into

the screw hole 110'a. In this configuration, the elasticity of the elastic

member 142' may be adjusted by turning the adjustment screw 141'.

Reference numeral 143' is an elastic member guide mounted by

insertion of the elastic member 142' for guiding the elastic member 142' not to be deviated.

INDUSTRIAL APPLICABILITY

The circular saw assembly according to the present invention has

been described in detail. However, it should be understood that the

detailed description and specific examples, while indicating preferred

embodiments of the invention, are given by way of illustration only,

since various changes and modifications within the spirit and scope of

the invention will become apparent to those skilled in the art from this

detailed description.

For example, though described in the embodiment that the

cutting unit 30 is installed on the table 10, the cutting unit 30 may be

installed under the table 10 or integrally inserted in a housing

constituting the table.

The circular saw assembly according to the present invention may

easily and rapidly cut metal plates because local stress concentrated on

the circular saw blade during cutting the metal plate may be dispersed

to the sliding support and this sliding support may securely support the

circular saw blade, so preventing breakdown of the blade due to

amplified vibration and ensuring work stability. In addition, such work

stability may extend the life of the circular saw, so ensuring the circular

saw to cut over area of 200,000cm². Besides, because the backlash phenomenon may be solved owi ng to the secure supporting of the sliding support, the circular saw assembly does not need a large-scale reducer.

According to experiments, the inventors have found that the

circular saw blade cuts the metal plate with loss of about 2.5mm in

thickness of a cut portion, and this cut portion has a smooth and flat

surface owing to a wide side and its stable support of the circular saw

blade. Therefore, when using the circular saw assembly of the present

invention, there is no need to finish a cut section, which may solve the

problem of material loss of the prior art, caused by leaving a spare area

to be finished.

Furthermore, scraps generated during the cutting process in the

present invention does not alternate their properties, differently to the

oxygen cutting, so that it is possible to recycle all of them.

Claims

What is claimed is:

1. A circular saw assembly for cutting metal plates

comprising:

a circular saw blade (200) rotating at a high speed by a rotary

shaft to cut the metal plates;

a casing (110, 111) for covering and supporting the circular saw

blade (200) so that the circular saw blade (200) is partially exposed

outside;

sliding supports (130) mounted at an inner side of the casing (110,

111) to contact both sides of the circular saw blade (200), a through

hole (131) being formed at the sliding supports (130) to discharge

lubricant supplied through a lubricant pipe (50a) to a surface contacted

with the circular saw blade (200); and

a means mounted to the casing (110, 111) for biasing the sliding

support (130) to pressurize the circular saw blade (200).

2. The circular saw assembly as claimed in claim 1,

wherein the biasing means is mounted only to one side of the

circular saw blade (200).

3. The circular saw assembly as claimed in claim 1, wherein the biasing means includes:

a cylinder block (141) mounted to the casing for being supplied

with hydraulic pressure from a hydraulic pump; and

a movable member (142) installed to the cylinder block for being

movable in a predetermined distance, the movable member (142)

biasing the sliding support (130) by pressurization when the hydraulic

pressure is supplied thereto.

4. The circular saw assembly as claimed in claim 1,

wherein the biasing means includes an elastic member (142') for

biasing the sliding support (130) by pressurization toward the circular

saw blade (200).

5. The circular saw assembly as claimed in claim 4,

wherein the biasing means further includes an adjustment screw

(141') screwed in a screw hole (110'a) formed at the casing so as to

adjust elasticity of the elastic member (142').

6. The circular saw assembly as claimed in claim 1,

wherein the casing includes a fixed casing (111) fixed installed,

and a cover casing (110) combined by a hinge to the fixed casing (110).

7. The circular saw assembly as claimed in claim 1,

wherein an air injector (80) is installed at the casing for supplying

a cut portion of the metal plates.