Title of Invention	A DEVICE FOR PROFILE MACHINING OF AXIAL PROFILE FAN BLADES
Abstract	Accordingly there is provided a device capable of configurating any desired-shaped profile on Fan Impeller Blades, comprising a vertical column mounted on a base, and horizontally accommodating a rotatable main shaft a tool head (03) mounted on the main shaft proximal to the vertical coloumn which guides the tool head a cutter connected to the main shaft and driven by a drive unit a tracing roller mounted at a distal end of the main shaft via a connecting rod a template mounted on its base such that the tracing roller can slide over the template and have a positive contact with the template via a spring-loaded means the spring-loaded means mounted on the main shaft away from the vertical column and a swiveling fixture accommodating a component to be profiled and orienting the component to the cutter the component and the swiveling fixture being mounted on a feeding means.

Title of Invention

A DEVICE FOR PROFILE MACHINING OF AXIAL PROFILE FAN BLADES

Abstract

Accordingly there is provided a device capable of configurating any desired-shaped profile on Fan Impeller Blades, comprising a vertical column mounted on a base, and horizontally accommodating a rotatable main shaft a tool head (03) mounted on the main shaft proximal to the vertical coloumn which guides the tool head a cutter connected to the main shaft and driven by a drive unit a tracing roller mounted at a distal end of the main shaft via a connecting rod a template mounted on its base such that the tracing roller can slide over the template and have a positive contact with the template via a spring-loaded means the spring-loaded means mounted on the main shaft away from the vertical column and a swiveling fixture accommodating a component to be profiled and orienting the component to the cutter the component and the swiveling fixture being mounted on a feeding means.

Full Text	-2- FIELD OF INVENTION: The present invention relates to a device for profile machining. More particularly the present invention relates to a device capable of configurating any desired-shaped profile on Fan Impeller blades. BACKGROUND OF THE INVENTION Fans are used to produce draught to the furnace or to handle the pulverized fuel or to re circulate the flue gases or to provide cooling air for various equipments in the thermal plants. The forced draught fan (FD) provides atmospheric air for combustion and the induced draught fan (ID) handles the products of combustion. Primary air fan (PA) handles cold (atmospheric) or hot air to carry the pulverized fuel. Mill fans are used to produce draught in the milling system and Gas recirculation fans (GR) re circulate the flue gases to control the steam temperatures. Axial fans are used in FD fan application and PA fan application in the thermal power plants. The axial profiled fans have specific design which are having the features of rotating the fan blades to the required angle during running of the fan depending upon the load requirements. This is enabled by a servo motor system. The blades are generally made up of Aluminum Forgings. The forgings are procured from the suppliers and machined to the required shape and size. The locating dimensions in the blade boss are machined in a lathe. The drilling and counter boring of holes for fixing the blades with the blade shafts of the impeller are done in -3- the drilling machine. The profile cutting and length correction are done manually by cutting and filing. Thus, the prior art manufacturing process entail the disadvantage of manual operations for example, profile trimming and length correction by cutting and filing. OBJECTS OF INVENTION: It is therefore an object of the present invention to propose a device capable of configurating any desired-shaped profile on Fan Impeller Blades which ensures positive contact of the tracing roller including the backlash of the cutter. Another object of the present invention is to propose a device capable of configurating any desired-shaped profile Fan on Impeller Blades which is capable to swivel the base which orients the components to the cutter. A further object of the invention is to propose a device capable of configurating any desired-shaped profile on Fan Impeller Blades which has means to suit the aerofoil shape of the blade. A still further object of the invention is to propose a device capable of configurating any desired-shaped profile on Fan Impeller Blades which has means to suit the component profile with a proper alignment and less friction, and is capable to travel along the template in a self-determined tool path. SUMMARY OF THE INVENTION: Accordingly there is provided a device capable of configurating any desired-shaped profile on Fan Impeller Blades, comprising a vertical column mounted on a base, and horizontally accommodating a rotatable main shaft a tool head (03) -4- mounted on the main shaft proximal to the vertical coloumn which guides the tool head a cutter connected to the main shaft and driven by a drive unit a tracing roller mounted at a distal end of the main shaft via a connecting rod a template mounted on its base such that the tracing roller can slide over the template and have a positive contact with the template via a spring-loaded means the spring-loaded means mounted on the main shaft away from the vertical column and a swiveling fixture accommodating a component to be profiled and orienting the component to the cutter the component and the swiveling fixture being mounted on a feeding means. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1- schematically shows the device including the component to be profiled. Figure 2- is a pictorial view of the device during a profile-cutting operation. DETAILED DESCRIPTION OF THE INVENTION: The present invention is described herein below in detail with reference to the accompanying drawing. As shown in Figure 1, the device of the invention comprises a base (01) made up of cast iron having intricate shape on which a vertical column (02) is mounted. The vertical column (02) ensures the verticality and further guides a tool head (03). The tool head (03) is having a tilting means, and is mounted on a main shaft (04) which connects a cutter (05) and a tracing roller (08). The cutter (05) is a concave multi tooth cutter. A spring loaded means (06) is mounted on the main shaft (04) which -5- ensures a positive contact of the tracing roller (08) with a template (12). A connecting rod (07) connects the main shaft (04) and the tracing roller (08). A reduction gear box (10) is coupled to a drive motor (11) and a drive sprocket (09) to enable movement of the tool head (03). The tracing roller (08) slides over the template (12) which is mounted on a base (13) of the template (12), and forms a shape and size to suit the profile of a component (14) with proper alignment and less friction and further controls the movement of the tool path. The component (14) is mounted on a swiveling fixture (15) which orients the component (14) to the cutter (05). Both the component (14) and a base of the swiveling fixture (15) is mounted on a feeding means (16). The component (14) is mounted on the swiveling fixture (15) corresponding to a reference mark provided on the base (02). The template (12) is mounted on its base (13) vertically. Drive to be given to the cutter (05) which forms the required radius over the profile. The component (14) is moved towards the cutter (05) to enable the machining. Depth of cut is given by the feeding means (16) to achieve the required size. The cutter (05) is moved up and down through the guide ways by the drive unit (09,10). The up and down movement upto an ascending point and a descending point is controlled electrically by timers and controls (not shown) This novel arrangement and configuration of the device suit the aerofoil shape of the blade (14). -6- We Claim: 1. A device capable of configurating any desired-shaped profile on Fan Impeller Blades, comprising: - a vertical column (02) mounted on a base (01), and horizontally accommodating a rotatable main shaft (04); - a tool head (03) mounted on the main shaft (04) proximal to the vertical coloumn (02) which guides the tool head (03); - a cutter (05) connected to the main shaft (04), and driven by a drive unit (09,10,11); - a tracing roller (08) mounted at a distal end of the main shaft (04) via a connecting rod (07); - a template (12) mounted on its base (13) such that the tracing roller (08) can slide over the template (12) and have a positive contact with the template (12) via a spring-loaded means (06), the spring-loaded means (06) mounted on the main shaft (04) away from the vertical column (02); and - a swiveling fixture (15) accommodating a component (14) to be profiled and orienting the component (14) to the cutter (05), the component (14) and the swiveling fixture (15) being mounted on a feeding means (16). 2. The device as claimed in claim 1, wherein the tracing roller (08) forms a shape and size to match a desired profile of the component (14), and wherein the tracing roller (08) is configured so as to be capable to smoothly travel along the template (12) and determine the tool-path. 3. The device as claimed in claim 1, wherein the spring-loaded means (06) enables the tracing roller (08) to ensure a positive contact with the template (120 which eliminates the backlash. -7- 4. The device as claimed in claim 1, wherein the drive unit (9,10,11) enables the cutter (05) to move vertically through the guide-way determined by the tracing roller (08). 5. The device as claimed in claim 1, wherein the tool head (03) comprises a tilting means. 6. A device capable of configurating any desired-shaped profile on Fan Impeller Blades as substantially described and illustrated herein with reference to the accompanying drawings. Dated This 2&&T day of September 2007 Accordingly there is provided a device capable of configurating any desired-shaped profile on Fan Impeller Blades, comprising a vertical column mounted on a base, and horizontally accommodating a rotatable main shaft a tool head (03) mounted on the main shaft proximal to the vertical coloumn which guides the tool head a cutter connected to the main shaft and driven by a drive unit a tracing roller mounted at a distal end of the main shaft via a connecting rod a template mounted on its base such that the tracing roller can slide over the template and have a positive contact with the template via a spring-loaded means the spring-loaded means mounted on the main shaft away from the vertical column and a swiveling fixture accommodating a component to be profiled and orienting the component to the cutter the component and the swiveling fixture being mounted on a feeding means.

Full Text

-2-
FIELD OF INVENTION:
The present invention relates to a device for profile machining.
More particularly the present invention relates to a device capable of configurating
any desired-shaped profile on Fan Impeller blades.
BACKGROUND OF THE INVENTION
Fans are used to produce draught to the furnace or to handle the pulverized fuel or
to re circulate the flue gases or to provide cooling air for various equipments in the
thermal plants. The forced draught fan (FD) provides atmospheric air for combustion
and the induced draught fan (ID) handles the products of combustion. Primary air
fan (PA) handles cold (atmospheric) or hot air to carry the pulverized fuel. Mill fans
are used to produce draught in the milling system and Gas recirculation fans (GR) re
circulate the flue gases to control the steam temperatures.
Axial fans are used in FD fan application and PA fan application in the thermal power
plants. The axial profiled fans have specific design which are having the features of
rotating the fan blades to the required angle during running of the fan depending
upon the load requirements. This is enabled by a servo motor system.
The blades are generally made up of Aluminum Forgings. The forgings are procured
from the suppliers and machined to the required shape and size. The locating
dimensions in the blade boss are machined in a lathe. The drilling and counter
boring of holes for fixing the blades with the blade shafts of the impeller are done in

-3-
the drilling machine. The profile cutting and length correction are done manually by
cutting and filing. Thus, the prior art manufacturing process entail the disadvantage
of manual operations for example, profile trimming and length correction by cutting
and filing.
OBJECTS OF INVENTION:
It is therefore an object of the present invention to propose a device capable of
configurating any desired-shaped profile on Fan Impeller Blades which ensures
positive contact of the tracing roller including the backlash of the cutter.
Another object of the present invention is to propose a device capable of
configurating any desired-shaped profile Fan on Impeller Blades which is capable to
swivel the base which orients the components to the cutter.
A further object of the invention is to propose a device capable of configurating any
desired-shaped profile on Fan Impeller Blades which has means to suit the aerofoil
shape of the blade.
A still further object of the invention is to propose a device capable of configurating
any desired-shaped profile on Fan Impeller Blades which has means to suit the
component profile with a proper alignment and less friction, and is capable to travel
along the template in a self-determined tool path.
SUMMARY OF THE INVENTION:
Accordingly there is provided a device capable of configurating any desired-shaped
profile on Fan Impeller Blades, comprising a vertical column mounted on a base,
and horizontally accommodating a rotatable main shaft a tool head (03)

-4-
mounted on the main shaft proximal to the vertical coloumn which guides the tool
head a cutter connected to the main shaft and driven by a drive unit a tracing roller
mounted at a distal end of the main shaft via a connecting rod a template mounted
on its base such that the tracing roller can slide over the template and have a
positive contact with the template via a spring-loaded means the spring-loaded
means mounted on the main shaft away from the vertical column and a swiveling
fixture accommodating a component to be profiled and orienting the component to
the cutter the component and the swiveling fixture being mounted on a feeding
means.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1- schematically shows the device including the component to be profiled.
Figure 2- is a pictorial view of the device during a profile-cutting operation.
DETAILED DESCRIPTION OF THE INVENTION:
The present invention is described herein below in detail with reference to the
accompanying drawing.
As shown in Figure 1, the device of the invention comprises a base (01) made up of
cast iron having intricate shape on which a vertical column (02) is mounted. The
vertical column (02) ensures the verticality and further guides a tool head (03). The
tool head (03) is having a tilting means, and is mounted on a main shaft (04) which
connects a cutter (05) and a tracing roller (08). The cutter (05) is a concave multi
tooth cutter. A spring loaded means (06) is mounted on the main shaft (04) which

-5-
ensures a positive contact of the tracing roller (08) with a template (12). A
connecting rod (07) connects the main shaft (04) and the tracing roller (08). A
reduction gear box (10) is coupled to a drive motor (11) and a drive sprocket (09) to
enable movement of the tool head (03). The tracing roller (08) slides over the
template (12) which is mounted on a base (13) of the template (12), and forms a
shape and size to suit the profile of a component (14) with proper alignment and
less friction and further controls the movement of the tool path. The component
(14) is mounted on a swiveling fixture (15) which orients the component (14) to the
cutter (05). Both the component (14) and a base of the swiveling fixture (15) is
mounted on a feeding means (16).
The component (14) is mounted on the swiveling fixture (15) corresponding to a
reference mark provided on the base (02). The template (12) is mounted on its
base (13) vertically. Drive to be given to the cutter (05) which forms the required
radius over the profile. The component (14) is moved towards the cutter (05) to
enable the machining. Depth of cut is given by the feeding means (16) to achieve
the required size. The cutter (05) is moved up and down through the guide ways by
the drive unit (09,10). The up and down movement upto an ascending point and a
descending point is controlled electrically by timers and controls (not shown)
This novel arrangement and configuration of the device suit the aerofoil shape of the
blade (14).

-6-
We Claim:
1. A device capable of configurating any desired-shaped profile on Fan Impeller
Blades, comprising:
- a vertical column (02) mounted on a base (01), and horizontally
accommodating a rotatable main shaft (04);
- a tool head (03) mounted on the main shaft (04) proximal to the vertical
coloumn (02) which guides the tool head (03);
- a cutter (05) connected to the main shaft (04), and driven by a drive unit
(09,10,11);
- a tracing roller (08) mounted at a distal end of the main shaft (04) via a
connecting rod (07);
- a template (12) mounted on its base (13) such that the tracing roller (08) can
slide over the template (12) and have a positive contact with the template
(12) via a spring-loaded means (06), the spring-loaded means (06) mounted
on the main shaft (04) away from the vertical column (02); and
- a swiveling fixture (15) accommodating a component (14) to be profiled and
orienting the component (14) to the cutter (05), the component (14) and the
swiveling fixture (15) being mounted on a feeding means (16).

2. The device as claimed in claim 1, wherein the tracing roller (08) forms a shape
and size to match a desired profile of the component (14), and wherein the tracing
roller (08) is configured so as to be capable to smoothly travel along the template
(12) and determine the tool-path.
3. The device as claimed in claim 1, wherein the spring-loaded means (06) enables
the tracing roller (08) to ensure a positive contact with the template (120 which
eliminates the backlash.

-7-
4. The device as claimed in claim 1, wherein the drive unit (9,10,11) enables the
cutter (05) to move vertically through the guide-way determined by the tracing roller
(08).
5. The device as claimed in claim 1, wherein the tool head (03) comprises a tilting
means.
6. A device capable of configurating any desired-shaped profile on Fan Impeller
Blades as substantially described and illustrated herein with reference to the
accompanying drawings.

Dated This 2&&T day of September 2007

Accordingly there is provided a device capable of configurating any desired-shaped
profile on Fan Impeller Blades, comprising a vertical column mounted on a base,
and horizontally accommodating a rotatable main shaft a tool head (03)

mounted on the main shaft proximal to the vertical coloumn which guides the tool
head a cutter connected to the main shaft and driven by a drive unit a tracing roller
mounted at a distal end of the main shaft via a connecting rod a template mounted
on its base such that the tracing roller can slide over the template and have a
positive contact with the template via a spring-loaded means the spring-loaded
means mounted on the main shaft away from the vertical column and a swiveling
fixture accommodating a component to be profiled and orienting the component to
the cutter the component and the swiveling fixture being mounted on a feeding
means.

Documents:

01314-kol-2007-abstract.pdf

01314-kol-2007-claims.pdf

01314-kol-2007-correspondence others 1.1.pdf

01314-kol-2007-correspondence others.pdf

01314-kol-2007-description complete.pdf

01314-kol-2007-drawings.pdf

01314-kol-2007-form 1.pdf

01314-kol-2007-form 18.pdf

01314-kol-2007-form 2.pdf

01314-kol-2007-form 3.pdf

01314-kol-2007-gpa.pdf

1314-KOL-2007-(11-05-2012)-ABSTRACT.pdf

1314-KOL-2007-(11-05-2012)-AMANDED CLAIMS.pdf

1314-KOL-2007-(11-05-2012)-AMANDED PAGES OF SPECIFICATION.pdf

1314-KOL-2007-(11-05-2012)-DESCRIPTION (COMPLETE).pdf

1314-KOL-2007-(11-05-2012)-DRAWINGS.pdf

1314-KOL-2007-(11-05-2012)-EXAMINATION REPORT REPLY RECEIVED.pdf

1314-KOL-2007-(11-05-2012)-FORM-1.pdf

1314-KOL-2007-(11-05-2012)-FORM-2.pdf

1314-KOL-2007-(11-05-2012)-FORM-3.pdf

1314-KOL-2007-(11-05-2012)-OTHERS.pdf

1314-KOL-2007-(12-07-2012)-AMANDED CLAIMS.pdf

1314-KOL-2007-(12-07-2012)-CORRESPONDENCE.pdf

1314-KOL-2007-(12-07-2012)-OTHERS.pdf

1314-KOL-2007-CORRESPONDENCE 1.1.pdf

abstract-01314-kol-2007.jpg

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Patent Number

255100

Indian Patent Application Number

1314/KOL/2007

PG Journal Number

04/2013

Publication Date

25-Jan-2013

Grant Date

22-Jan-2013

Date of Filing

21-Sep-2007

Name of Patentee

BHARAT HEAVY ELECTRICALS LIMITED

Applicant Address

REGIONAL OPERATIONS DIVISION (ROD), PLOT NO. 9/1, DJBLOCK 3RD FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA-700091, HAVING ITS REGISTERED OFFICE AT BHEL HOUSE, SIRI FORT, NEW DELHI- 110049

Inventors:

#	Inventor's Name	Inventor's Address
1	SHRI PEDHABBA NAIDU LOGANATHAN	BHARAT HEAVY ELECTRICALS LIMITED, RANIPET-632406

PCT International Classification Number

F04D29/32

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA