FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION An automatic flaw detection device for machining system


APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTOR
Waghmare Baburao an Indian national
of TATA MOTORS LIMITED an Indian company
having its registered office at Bombay House.
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India

PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner
in which it is to be performed.


FIELD OF INVENTION:
The present invention is related to machining system and more particularly it relates to an automatic flaw detection device for machining system which automatically detects the broken drill before job proceeds for further operation.
Pre check automatically the drilled holes completely with the aid spring operated mechanism through electrical sensing before offering the job for further operation.
BACKGROUND OF INVENTION:
Generally any high speed machining operation or in particular drilling operations are done with the help of using carbide tools and in case of drilling operation, the carbide drills rotating at high speed are fed for machining the job.
Typically crank shaft flange faces are drilled for providing holes which are used for mounting flywheel assembly. This operation is done at drilling station. Normally the job to be drilled is clamped on the indexable table at first drilling station and drilling operation is carried out on the flange face of said crank shaft for providing four holes at left hand side of the said job (crank shaft ). The said indexable table with the holes drilled on flange of said crank shaft at first drilling station is indexed to the second drilling station for drilling another four holes on the face of said crank shaft flange . After drilling two set of four holes the said crank shaft proceeds for tapping operation to the tapping station. At tapping station tapping opertion is done on already drilled holes and the table returns to first drilling position for feeding fresh job.
This system suffers from one of the major disadvanatage is that if holes drilled at previous two drilled stations are faulty due to breakage of drills due to high speed drilling and broken drill remaining in the flange of said crankshaft leading to incomplete drilling and if such incomplete finished job proceeds for next tapping operation then at the tapping station , the tap gets damaged or it breaks . at times the


tapping spindle also gets damaged or tapping spindle bends and the job under tapping operatino also gets damaged which leads to faulty job production or unfit for intended purpose and hence the job finally gets rejected.
The present invention is developed for automatically checking the fault at drilling stations and job will proceed to the next tapping operation only after detecting the holes are properly drilled and ther is no fault found.
OBJECTS OF INVENTION
The main objective of the present invention is to provide an automatic flaw detection device for machining system
Another object of the present invention is to provide an automatic flaw detection device for machining system which detects or monitors the broken drill to prevent further damages which also generates alarm to indicate the fault in the system to take precautionary measures.
Yet another object of the present invention is to provide an automatic flaw detection device for machining system which is simple and cost effective.
BRIEF DESCRIPTION OF INVENTION:
In accordance with the present invention, an automatic flaw detection device for machining system comprises; a mounting bracket member (1) attached to the multi-spindle drill unit, first distance piece (2), resilient plate member (3) which is spring steel plate of which top end is connected to said mounting bracket member (1) along with said distance piece (2) in between said bracket member (1) and resilient plate member (3) with the help of mounting means (4) such as nut and bolts, lower end of said resilient plate member (3) is connected to circular flange member (6) along with


second distance piece (5) in between them, plurality of probe members (7) mounted on the said circular flange member (6) for detecting the deflection of said resilient member (3), proximity sensor means (10) for sensing the detecting the deflection of said resilient member (3); wherein said proximity sensor (10) is mounted at lower end of proximity mounting bracket member (8) near to said probe member (7) such that the deflection of said resilient member (3) with the help of movement of said probe (7) over the broken drills on holes of job or unfinished job is sensed by said proximity sensor (10) ; upper end of said proximity bracket member (8) is connected to said mounting bracket member (1) with the help of nut-bolts (9), said proximity sensor is mounted to said proximity bracket member (8) with the help of setting nuts (11).
BRIEF DESCRIPTION OF DRAWINGS
Figure—01 shows the exploded view of automatic flaw detection device for machining system
Figure-02 shows the assembled view and top view of device in accordance with the present invention
Figure-03 shows the drilling and tapping stations along with the device fitted between the drilling and tapping line.
DETAILED DESCRIPTION OF INVENTION
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same,
Now referring to figure-01 and 02, In accordance with the present invention, an automatic flaw detection device for machining system comprises; a mounting bracket


member (1) attached to the multi-spindle drill unit, first distance piece (2), resilient plate member (3) which is spring steel plate of which top end is connected to said mounting bracket member (1) along with said distance piece (2) in between said bracket member (1) and resilient plate member (3) with the help of mounting means (4) such as nut and bolts, lower end of said resilient plate member (3) is connected to circular flange member (6) along with second distance piece (5) in between them, plurality of probe members (7) mounted on the said circular flange member (6) for detecting the deflection of said resilient member (3), proximity sensor means (10) for sensing the detecting the deflection of said resilient member (3); wherein said proximity sensor (10) is mounted at lower end of proximity mounting bracket member (8) near to said probe member (7) such that the deflection of said resilient member (3) with the help of movement of said probe (7) over the broken drills on holes of job or unfinished job is sensed by said proximity sensor (10) ; upper end of said proximity bracket member (8) is connected to said mounting bracket member (1) with the help of nut-bolts (9), said proximity sensor is mounted to said proximity bracket member (8) with the help of setting nuts (11).
The broken drill or incomplete hole is sensed by said probes members (7) mounted on said circular flange member (6). The said flange (6) is clamped at lower end of said resilient member (3) with the help of nut-bolts (4). The top end of said resilient end is clamped to said mounting bracket member (1) which is mounted on the said multi spindle unit (12). The said resilient member (3) which is spring steel plate deflects due to touching the unfinished hole or broken drill by said probe members (7). The said resilient member(3) is configured to have stiffness such that said resilient member (3) moves or deflects only when sufficient obstruction occurs and it does not deflect of move during spindle unit movement. The deflection of said resilient member is sensed by proximity switch sensor (10) mounted on lower end of said proximity mounting bracket (8) near to said probe members (7). Said proximity mounting bracket (8) is connected to the said mounting bracket member (1). The

command of said proximity switch sensor (10) stops further advancement of spindle slide movement of indexable table (14) and generates alarm of broken drill. Then operator has to change the broken drill and completes the operation.
Now referring to figure-03 which shows drilling and tapping stations along with the device fitted between the drilling and tapping line, the machining line comprises ; multi spindle drilling unit (12), tapping station (13) , indexable table (14) on which job is to be clamped, the job to be drilled is clamped on the said indexable table (14) at first drilling station (15) which is first drilling position (15') and drilling operation is carried out on the flange face of said crank shaft for providing four holes at left hand side of the said job (crank shaft ). The said indexable table (14) with the holes drilled on flange of said crank shaft at first drilling station (15) is indexed to the second drilling station (16) which is secnd drilling position (16') for drilling another four holes on the face of said crank shaft flange . After drilling two set of four holes the said crank shaft moves to the flaw detection device (17) which is detection position (17') for inspection of any fault due to drill breaking. If the said crank shaft flange doesn't have any defect, then job moves to next operation which is tapping operation to the tapping station (13) at tapping postion (13'). At tapping station, tapping operation is done on already drilled holes and the said table (14) returns to first drilling station (15) for feeding fresh job. If the said crank shaft flange have any defect which is detected by said proximity sensor (10) which indicates the defect by indicating to operator either by sound or light, the operator has to look in to the defect and corrects the defects by changing the damaged drill, then job moves for next operation which is tapping operation at the tapping station (13). After tapping operation, at said tapping station (13), the said table (14) returns to first drilling position (15') for feeding fresh job.
The length of said resilient member (03) is such that center of the PCD of said holes on said flange of crank shaft previously machined will match or can be exactly set.

The linear index position is matched to accommodate the detection position (17') without any obstruction considering next tapping station.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof
Dated this 30th day of March 2009
TATA MOTORS LIMITED By their Agent & Attorney

Karuna Goleria of DePENNING & DePENNING