Annexure‐I
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FORMING TOOL
FIELD OF THE INVENTION
This invention pertains to the preparation of steel tools for cold forming of
certain light weight sheet metal alloys to reduce adherence of cold work piece
material to the tool surface. More specifically, this invention pertains to
embedding mirror finish forming surfaces in tool steel forming surface for
reducing friction between the forming surface and sheet metal work piece and
adherence of the work piece material to the tool.
This invention relates to forming tool for thin metal work pieces. More
specifically, it relates to a forming tool, which may be used to hold and form the
thin and light weight metal sheet of various shape and size. Forming tool used to
form the thin metal sheet in a manner that all reference surfaces given on metal
sheet are in proper position for the forming.
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BACKGROUND OF THE INVENTION
There is a need to increase the use of light Weight metal alloys in the
manufacturing of aircraft. For example, aluminum alloy sheet Work pieces are
formed at room temperature. Aluminum alloys may be prepared in sheet form to
display a high level of formability. While the thin sheet of aluminum alloy is quite
formable, it tends to adhere to tool surfaces, requiring special tool alloys, special
surface finish for the tool and frequent cleaning or repair of the forming surfaces.
Any adhesion of an aluminum Work piece to its forming tools is of particular
concern since sticking of work piece material on the forming tool directly
influences the final quality of each formed part. It is a purpose of this invention to
provide sheet metal forming tools made of readily available hard tool steel
compositions with surfaces displaying reduced friction and less adhesion when
the tools engage and deform light metal alloy work pieces.
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This invention pertains to a shaping tool for holding metal sheet on work
bench and more particularly to a bending tool adapted to support metal sheet to
be bent. An object of this invention is the provision of new and improved bending
tool for metal sheets which is rigid, rugged, compact and capable of high
precision holding of metal sheet. This bending tool helps to minimize the setup
time and maximize the productivity.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention is to provide a forming
tool that facilitates holding of a metal sheet on tool and supporting the surface of
metal sheet thereof while the forming is done to a predetermined shape and size.
In accordance with second aspect of present invention is to provide a
forming tool for holding the work piece for accurate positioning of metal sheet on
die with respect to punch.
In accordance with yet another aspect of present invention is to provide a
forming tool comprises bearing resistance.
In accordance with yet another aspect of present invention is to provide a
forming tool having low friction between sheet to be form and punch.
In accordance with yet another aspect of present invention is to provide a
forming tool for rigid clamping of metal sheet.
In accordance with yet another aspect of present invention is to provide a
forming tool for thin metal sheet adapted to be fixed on the die of forming tool.
In accordance with yet another aspect of present invention is to provide a
more rigid forming tool.
In accordance with yet another aspect of present invention is to provide a
lighter forming tool.
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In accordance with yet another aspect of present invention is to provide a
forming tool that can be properly and effectively utilized to hold and firmly fix the
job by lesser skilled individuals.
BRIEF DESCRIPTION OF THE DRAWINGS
The features and advantages of the present invention will become more apparent
and descriptive in the description when considered together with figures/flow
charts presented: (As per Annexure-Ia)
Fig.1 is a front cross section view of a steel forming tool for use in cold forming of
metal sheet.
Fig.2 is a top view and Sectional side view of the punch of forming tool.
Fig.3 is a top view and Sectional side view of the die of forming tool.
Fig.4 is a diamond and locating pin of the forming tool.
DETAILED DESCRIPTION
Cold forming generally represents a process in which a relatively thin
sheet metal work piece is forced into conformance with a forming surface of a
forming tool by applying force on punch. Suitable sheet metal work pieces
utilized in such cold forming processes are generally only about a millimeter to a
few millimeters in thickness and are composed of materials capable of
undergoing high deformation. Severe forces acts between the forming surface of
the forming tool and the contacting surface of the sheet metal work piece can
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significantly influence the quality and aesthetic appearance of the finished and
fully conformed sheet metal work piece.
Referring to fig. 1, 2, 3 & 4 present invention is a forming tool 15 used to
hold, position and form the thin metal sheet 16 and adapted for use on press
machine. The forming tool 15 is designed to hold a metal sheet 15 within
dimensional tolerance on the upper face 19 die 2 to perform the forming function
of the tool 15.
Forming tool 15 for holding a metal sheet 16 comprises a bracket 1 having
substantially flat top and bottom surface. It is made of high hardness steel and
used for the holding of die in the cavity 17 made for the purpose. Bracket 1 also
has four holes 18 through which die 2 are firmly held in bracket 1 with the help of
Allen head screw 6. It also ensures that the support and guidance to the punch 3
and metal sheet 16 during operation.
Die 2 is made of high hardness ferrous material. Die 2 is fixed to the
bracket 1 through four threaded through holes 11.the upper surface 19 and lower
surface 20 of die 2 is hardened and ground to made it substantially flat and
adaptable in bracket 1 cavity 17.the upper surface 19 of the die 2 is super
finished so the metal work piece 15 can glide on the die during forming and
prevent sticking. Die 2 also have one holes 12 for locating pin 4 and one hole 21
for diamond pin 5.one more hole 13 has been fabricated in die 2 .hole 13 is for
accommodating Allen screw head used for the fixing of punch 3 in press
machine. The forming edge 14 of die 2 is polished and super finished so that
material will glide during forming without sticking.
Punch 3 is made of high hardness ferrous material. Punch 3 is fixed to the
press machine through four holes 7.the upper surface 22 and lower surface 23 of
punch 3 is hardened and ground to make it substantially flat and adaptable in
press machine. The upper surface 22 of the punch 3 is super finished so the
metal work piece 15 can glide on the punch during forming and prevent sticking.
Punch 3 also have one holes 8 for locating pin 4 and one hole 24 for diamond pin
5.one more threaded hole 9 has been fabricated in punch 3 . Threaded hole 9
is for fixing of punch 3 in press machine. The forming edge 10 of punch 3 is
polished and super finished so that material will glide during forming without
sticking.
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The locating pins 4 and diamond pin 5 are standard dowel pins. one
locating pins 4 and one diamond 5 are provided for accurately holding the job 16
in position and restrict any rotational movement in horizontal plane during the
forming process. Locating pins 4 and diamond pin 5 have their centers
positioned along the same axis to ensure proper alignment with holes drilled in
the job.

Claims:Accordingly, the description of the present invention is to be considered as illustrative only and is for the purpose of teaching those skilled in the art of the best mode of carrying out the invention. The details may be varied substantially without departing from the spirit of the invention, and exclusive use of all modifications which are within the scope of the appended claims is reserved. We Claim
1. A ferrous metal tool for forming thin metal alloy or other light metal alloy sheet work pieces at forming tool and work piece at room temperatures. The tool comprises of a bracket, die and punch with machined portion on die and punch defining a forming surface for sliding contact engagement with thin sheet work piece in deforming the work piece. The forming tool comprising:
-A bracket for holding the die of the forming tool.
-A die for forming of thin metal sheet.
-One locating dowel pin and one diamond pin which restrict the sideways movement of the job in horizontal plane and make the job rigid for performing the forming operation.
2. The forming tool of claim 1 in which the tool is made of hardened and ground ferrous steel.
3. The forming tool of claim 1 wherein, die is made of ferrous metal having super finished forming edge.
4. The forming tool of claim 1 wherein, punch is made of ferrous metal having hardened and super finished forming edge.
5. The forming tool of claim 1 wherein, the locating pin and diamond pin are placed with their centers aligned in the same horizontal axis to prevent the turning of work piece in horizontal axis.
6. The forming tool of claim 1 wherein, the tool has nine Allen head screws that apply right amount of pressure on die and punch and secure them with bracket and press machine respectively.