Title of Invention

A TOOL HOLDING DEVICE IN HORIZONTAL BORING MACHINE ADAPTABLE TO PERFORM GROOVE MACHINING IN A VERTICAL FLANGE FACE

Abstract This invention relates to a tool holding device in horizontal boring machines adaptable to perform groove machining in a vertical flange face comprising a shank (1) releasably attached and bolted to a guide plate (2) in which a cassette (4) is mounted by means of atleast one third bolt (5), the cassette (4) provided with a through hole for insertion of a tool bar (7) from one end and a thread part provided on the other end for pushing out the tool bar in an outward direction by means of a fourth bolt (8) which is being locked by a lock nut (9), the tool bar is tightend by a first bolt (3) provided in the cassette, re-positioning of the cassette is achievable by setting it at one of the plurality holes provided at different positions of the guide plate (2), the tool bar (7) holding a tool (11) by means of a bolt (10) at one end, the other end being inserted in the cassette (4).
Full Text 2
TITLE : A TOOL HOLDING DEVICE IN HORIZONTAL BORING MACHINE TO PERFORM GROOVE MACHINING
FIELD OF INVENTION
The present invention generally relates to a tool holding device. More particularly the present invention relates to a tool holding device in horizontal boring machine adaptable to perform groove machining on vertical flange face.
BACKGROUND OF THE INVENTION
In a typical machine shop, horizontal boring machine plays an important role to perform facing, boring, grooving and thread cutting (external / internal) operation etc. In horizontal boring machine, the tool head is positioned in horizontal position and the face of the component to be machined is kept vertical. Grooves are normally cut on flange faces for proper insertion of sealing element namely 'U' ring etc. These grooves require a very smooth finish and tight dimensional control. For machining grooves on a flange face using a horizontal boring machine, the cutting tool is clamped on a boring bar. Boring head has movable slides, and the movement of the slides is controlled via guide ways through manually driven gear box.
Gear Box —? movable slide —? Boring Bar —? cutting tool
+ Guide way
Boring Head —?

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when the tool starts a grooving operation, an opposite cutting force is generated which creates a gap between the movable slide and the guide way. This gap results into breakage of the tool tip and creates dimensional variation of the groove which leads to frequent breakdown of the tool vis - a - vis high machining time.
Secondly, the dimensional variations on machining takes place due to high vibrations caused by large overhang of the slide / tool. This also leads to impregnation of tool marks on the groove surface.
Thirdly, the tool holder movement take place directly through the gear box, as a result of which the gear box sometimes gets jammed due to entry of small metal chips in between the gear teeth. Such foreign materials lead to breakage of the gear teeth owing to excessive pressure generation and causes damage of the tool holder (cutting tool). All the deficiencies together result into poor surface finish and improper dimensions.
Fourthly, deficiencies in grooves are removed by manual buffing which leads to increase in cycle time, poor quality, low productivity and rework.
OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose a tool holding device in horizontal boring machines adaptable to perform groove machining in vertical flange face which eliminates the disadvantages of prior art.

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Another object of the invention is to propose a tool holding device in horizontal boring machines adaptable to perform groove machining in vertical flange face which leads to reduction in operational cycle time.
A yet another object of the invention is to propose a tool holding device in horizontal boring machine adaptable to perform groove machining in vertical flange face, which increases the productivity of the machine by eliminating rework.
A further object of the invention is to propose a tool holding device in horizontal boring machines adaptable to perform groove machining in vertical flange face, which generates better dimensional control and finish of groove.
A still further object of the invention is to propose a tool holding device in horizontal boring machines adaptable to perform groove machining in vertical flange face, which decreases power consumption.
A yet further object of the invention is to propose a tool holding device in horizontal boring machines adaptable to perform groove machining in vertical flange face, which reduces the frequency breakdown of the gear box.
SUMMARY OF THE INVENTION
To eliminate the problems of frequent breakage of gear box, increased vibration, and creation of gap between the movable slides and the guide way during groove cutting on horizontal boring machines, the movement of the invention provides a control means to monitor and control the boring bar.

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The control means has been configured to operate the two steps, for example, Step I - the movables slide has been converted into a fixed slide (cassette) by bolting it to the guide plate and thus eliminating the guide way altogether. The cassette eliminates gap generation between the boring bar and the movables slide, otherwise creatable due to cutting force. The boring bar is caused to advance in response to the tightening of the bolts in the cassette which in turn leads to tool movement. The invention further provides a lock arrangement for the boring bar and bolt avoids vibration. The maximum limit of boring bar movement is described in step II.
Step II - In order to overcome the problem of overhanging of the movable slide and the boring bar, the movement of the boring bar is achieved by varying the position of the cassette on a guide plate, thereby discarding the gear box arrangement altogether. A numbers of bolting positions are provided on the guide plate and the cassette is suitably attached on the bolting position of the guide plate to achieve required positioning of the boring bar to ensure greater rigidity.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. - 1 shows a schematic diagram of machining of grooves on a vertical flange face in the horizontal boring m/c in prior art.
Fig. - 2 shows a schematic diagram of a holding device in horizontal boring machines adaptable to perform groove machining according to present invention.

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Fig. - 3 shows a schematic diagram of the shank of fig. - 2. Fig. - 4 shows a schematic diagram of the cassette of Fig - 2. Fig - 5 shows a schematic diagram of the guide plate of Fig. 2. Fig - 6 shows schematic diagram of boring bar of fig - 2.
DETAILED DESCRIPTION OF A PREFERRED EMBODIEMNT OF THE INVENTION
Fig. 2 shows the device of the invention in the form of a boring head assembly to ensure proper groove (17) cutting on vertical flange face. Movement of the boring bar (7) is controlled by a first bolt (3) which is provided in the cassette (4). The boring bar (7) is movable corresponding to the tightening action of the first bolt (3). A provision is made for taking out cassette (4) from the existing position and re-clamped by a third bolt (5) a new location on the guide plate (2) to achieve required cutting approach without having substantial overhanging.
Figs. 3,4,5,6 - show that the shank (1) is fixed to the guide plate (2) by using a second bolt (6). The cassette (4) is attached to the guide plate (2) by using the third bolt (5). The boring bar (7) is tightly fitted within the cassette (4) by using the first bolt (3) for proper gripping.

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The cassette (4) is provided with a through hole with its threaded portion at one end. This threading is used to tighten a fourth bolt (8) which push the boring bar through the cassette. The boring bar through the cassette is push fit in a cassette hole for better fitting. At least two first bolts (3) are provided for better clamping. The cutting tool (11) is mounted on the boring bar (7) by using a fifth bolt (10).
For movement of the cutting tool (11), the tightening bolt (8) pushes the boring bar (7) in an outward direction which in turn advances the cutting tool (11). On reaching the right positing, the tightening bolt (8) is locked by a locknut (9) and the first bolt (3) also locks the boring bar in the cassette (4). When maximum limit of the boring bar (7) is reached during the machining operation, the cassette (4) is immediately taken out from the guide plate (2) and set in a new position and re-tightened using the bolt (5) in the guide plate (2). The boring bar (7) is further push fitted in the cassette (4) and machining of groove operation restarted until it is completed.
Tightening Bolt —? Boring Bar —? Cutting Tool
Cassette +Guide Plate —? Boring Bar —? Cutting Tool
Boring Head
8 WE CLAIM
1. A tool holding device in horizontal boring machines adaptable to perform
groove machining in a vertical flange face comprising :
- a shank (1) reliably attached and bolted to a guide plate (2) in
which a cassette (4) is mounted by means of at least one third bolt
(5),
- the cassette (4) provided with a through hole for insertion of a tool
bar (7) from one end and a thread part provided on the other end
for pushing out the tool bar in an outward direction by means of a
fourth bolt (8) which is being locked by a lock nut (9), the tool bar
is tightened by a first bolt (3) provided in the cassette, re
positioning of the cassette is achievable by setting it at one of the
plurality holes provided at different positions of the guide plate (2).
- the tool bar (7) holding a tool (11) by means of a bolt (10) at one
end, the other end being inserted in the cassette (4).
2. The device as claimed in claim 1, wherein the shank(l) is fitted on the
horizontal boring machine.
3. The device as claimed in claim 1, wherein the shank comprises a plurality
of clamping holes (6) matching with the holes of the guide plate (2) for
clamping the guide plate by using fastening means.

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4. The device as claimed in claim 1, wherein the cassette (4) is provided with
plurality of holes for clamping with the guide plate.
5. The device as claimed in claims 1 & 4, wherein positioning and
repositioning of the cassette can be done by resetting the clamp of the
cassette (4) at different holes disposed in the guide plate (2).
6. A tool holding device in horizontal boring machines adaptable to perform
groove machining in the vertical flange face as substantially illustrated and
described herein with reference to accompanying drawings.

This invention relates to a tool holding device in horizontal boring machines adaptable to perform groove machining in a vertical flange face comprising a shank (1) releasably attached and bolted to a guide plate (2) in which a cassette (4) is mounted by means of atleast one third bolt (5), the cassette (4) provided with a through hole for insertion of a tool bar (7) from one end and a thread part provided on the other end for pushing out the tool bar in an outward direction by means of a fourth bolt (8) which is being locked by a lock nut (9), the tool bar is tightend by a first bolt (3) provided in the cassette, re-positioning of the cassette is achievable by setting it at one of the plurality holes provided at different positions of the guide plate (2), the tool bar (7) holding a tool (11) by means of a bolt (10) at one end, the other end being inserted in the cassette (4).

Documents:

01300-kol-2006 abstract.pdf

01300-kol-2006 assignment.pdf

01300-kol-2006 claims.pdf

01300-kol-2006 correspondence others.pdf

01300-kol-2006 description (complete).pdf

01300-kol-2006 drawings.pdf

01300-kol-2006 form-1.pdf

01300-kol-2006 form-2.pdf

01300-kol-2006 form-3.pdf

1300-KOL-2006-(27-09-2011)-AMANDED PAGES OF SPECIFICATION.pdf

1300-KOL-2006-(27-09-2011)-CORRESPONDENCE.pdf

1300-KOL-2006-ABSTRACT 1.1.pdf

1300-KOL-2006-ABSTRACT-1.2.pdf

1300-KOL-2006-AMANDED CLAIMS-1.1.pdf

1300-KOL-2006-AMANDED CLAIMS.pdf

1300-KOL-2006-AMANDED PAGES OF SPECIFICATION.pdf

1300-KOL-2006-CORRESPONDENCE 1.1.pdf

1300-KOL-2006-CORRESPONDENCE.pdf

1300-KOL-2006-DESCRIPTION (COMPLETE).pdf

1300-KOL-2006-DRAWINGS 1.1.pdf

1300-KOL-2006-DRAWINGS-1.2.pdf

1300-KOL-2006-EXAMINATION REPORT REPLY RECIEVED.pdf

1300-KOL-2006-EXAMINATION REPORT.pdf

1300-KOL-2006-FORM 1-1.2.pdf

1300-KOL-2006-FORM 1.1.pdf

1300-KOL-2006-FORM 13.pdf

1300-KOL-2006-FORM 18.pdf

1300-KOL-2006-FORM 2-1.2.pdf

1300-KOL-2006-FORM 2.1.pdf

1300-KOL-2006-FORM 3.pdf

1300-KOL-2006-GPA.pdf

1300-KOL-2006-GRANTED-ABSTRACT.pdf

1300-KOL-2006-GRANTED-CLAIMS.pdf

1300-KOL-2006-GRANTED-DESCRIPTION (COMPLETE).pdf

1300-KOL-2006-GRANTED-DRAWINGS.pdf

1300-KOL-2006-GRANTED-FORM 1.pdf

1300-KOL-2006-GRANTED-FORM 2.pdf

1300-KOL-2006-GRANTED-LETTER PATENT.pdf

1300-KOL-2006-GRANTED-SPECIFICATION.pdf

1300-KOL-2006-OTHERS DOCUMENTS.pdf

1300-KOL-2006-OTHERS.pdf

1300-KOL-2006-REPLY TO EXAMINATION REPORT.pdf

abstract-01300-kol-2006.jpg


Patent Number 252465
Indian Patent Application Number 1300/KOL/2006
PG Journal Number 20/2012
Publication Date 18-May-2012
Grant Date 16-May-2012
Date of Filing 04-Dec-2006
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, INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 SANJAY GULATI BHEL HARDWAR
2 KAMAL KISHOR BAHUKHANDI BHEL, HARDWAR
3 RAM PAL SINGH BHEL, HARDWAR
4 KANCHAN SINGH BHEL, HARDWAR
5 TRILOK CHAND BHEL, HARDWAR
6 PRAMOD KUMAR BHEL, HARDWAR
7 SUSHIL KUMAR BAVEJA BHEL, HARDWAR
PCT International Classification Number B23B41/16,39/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA