WO2012042326A1 - An improved mechanism for upward lancing in a progressive die assembly - Google Patents

An improved mechanism for upward lancing in a progressive die assembly Download PDF

Info

Publication number
WO2012042326A1
WO2012042326A1 PCT/IB2011/002131 IB2011002131W WO2012042326A1 WO 2012042326 A1 WO2012042326 A1 WO 2012042326A1 IB 2011002131 W IB2011002131 W IB 2011002131W WO 2012042326 A1 WO2012042326 A1 WO 2012042326A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
lancing
actuator
punch
insert
Prior art date
Application number
PCT/IB2011/002131
Other languages
French (fr)
Inventor
Aman P. Goel
Nitin M. Dhumal
Original Assignee
Larsen & Toubro Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to IN2737MU2010 priority Critical
Priority to IN2737/MUM/2010 priority
Application filed by Larsen & Toubro Limited filed Critical Larsen & Toubro Limited
Publication of WO2012042326A1 publication Critical patent/WO2012042326A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/08Dies with different parts for several steps in a process
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/002Drive of the tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/02Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/10Incompletely punching in such a manner that the parts are still coherent with the work
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/16Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending

Abstract

The present invention relates to an improved mechanism for upward lancing in a progressive die assembly. The mechanism comprises plurality of springs means (la&lb), punch means (5), punch actuator means (6), lever means (7), lever actuator means (8), floating insert means (9) and a stripper insert means (10). The lever actuator means (8) is positioned in substantially vertical direction. The lever actuator comprises a collar means (8a), and guide means (8c). The lever means (7) is a substantially oblong shaped which is located on a base plate with a hinged hole (7b). The hinge or pin hole means (7b) is located substantially at center of the lever (7). The lever is provided with a plane elevated portion having a predetermined length substantially at the center of the lever (7). The floating insert means (9) comprises a slot means (9a) and plurality of edges (9b). The slot means (9a) being able to accommodate said spring means (lb). The stripper insert means (10) comprises a slot means (10a) for accommodating and guiding the floating insert means (9).

Description

AN IMPROVED MECHANISM FOR UPWARD LANCING IN A
PROGRESSIVE DIE ASSEMBLY
FIELD OF THE INVENTION
The present invention relates to progressive dies for processing coils / strip in progressive punching / cutting operations. More particularly, the invention is concerned about an improved mechanism for upward lancing in a progressive die assembly
BACKGROUND OF THE INVENTION
The manufacturing process for sheet metal component or stamping is by processing a sheet metal coil or strip in a press tool. The sheet metal strip or coil may be of ferrous or non ferrous materials.
Press working is one of the major processing techniques for converting sheet metal into sheet metal parts of different shapes. The sheet metal parts are required for different applications such as Electrical / electronic products, Automobiles, Watches etc. The sheet metal is punched between two parts called punch & die. The die profile is the female profile intentionally kept bigger than the punch profile by a uniform gap called cutting clearance.
Press tool mainly consists of two halves, namely fixed bottom half and a moving top half. The fixed bottom half is secured to the stationary bolster plate of mechanical press. It comprises arrangement to guide the strip/coil, die cavities, guide pillars for alignment of both halves etc. The top moving half is clamped to the moving ram of the mechanical press & it comprises a no. of circular & non circular cutting & non cutting elements called punches. The punches move up & down along with the moving ram of the mechanical press & they are guided in cavities made in a plate called Stripper. During downward movement, the punches penetrate the sheet metal & enter the die cavity thus pushing the sheet metal scrap displaced by the cutting punch into the lower half of the tool. One downward & return upward movement of the top half of press tool is called as stroke of press tool. Surrounding metal clings to the body of cutting punches during downward stroke. The same is stripped off by the stripper plate during upward stroke of the punches.
In a multi-station (progressive) press tool, the strip moves from one end of strip guides to the other. It moves progressively by a fixed distance called pitch after ever stroke of the mechanical press. At each stage of movement of the strip, different punching operations are carried out on strip/ coil leading to completion of stamping profile in the last stage.
Progressive dies are used for processing coils/ strip in progressive punching/ cutting operations. In progressive tools various operations such as piercing, embossing, notching, lancing, bending take place simultaneously at different locations in the tool. The requirement of these operations is decided by features in component / stamping design. The strip layout is the schematic arrangement /representation for sequencing various cutting/ punching operations on metal strip/coil in a progressive die. It has to be designed as per the component / stamping design.
Lancing is cutting along a line in a work piece without detaching the slug from the work piece. Mainly there are two types of construction, such as 1) Lancing punch operates from lower half of tool and 2) Lancing punch operates from top half of tool, by which lancing operation can be performed in a tool. Lancing operation is done in a separate tool with fixed lancing punch arrangement from top half of the tool. This increased handling of component reduces the productivity and yield due to tedious task of loading & unloading the components. US 4,106,422 teaches a method of making open can closures or can tops comprising the steps of piercing, marginally notching, and lancing the web according to a predetermined pattern. The notching, lancing and piercing are said to be done simultaneously by two tools of a single progressive die. Thus there is a need to overcome the problems of the prior art. The present inventors have developed an improved mechanism for upward lancing in a progressive die assembly to get consistent results with a single progressive tool and safeguarding the safety of lancing punch against breakage as well as avoiding obstruction to feeding of strip / coil.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the problems/disadvantages of the prior art.
Another object of the present invention is to provide an improved mechanism for upward lancing in a progressive die assembly
Yet, another object of the present invention is to provide a lever profile for use in the mechanism for upward lancing in a press tool. SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided an improved mechanism for upward lancing in a progressive die assembly, said mechanism comprising:
plurality of springs means;
punch means;
punch actuator means; lever actuator means positioned in substantially vertical direction; said lever actuator comprises a collar means, and guide means wherein said collar means having a predetermined length and width and substantially a rectangular shape positioned in substantially horizontal direction at a predetermined distance from a top or bottom face of the lever actuator means ; lever means having a substantially oblong shaped being located on a base plate with a hinged hole, said hinge or pin hole means being located substantially at center of the lever; said lever means at its two ends having two projected arms at a predetermined angle to the horizontal having substantially rounded profile at their ends to define plural point contacts and a plane elevated portion having a predetermined length being located substantially at the center of the lever; said construction of lever means being such that said point contacts being ensured between said lever means and said actuators means all the time; floating insert means comprising a slot means and plurality of edges wherein said slot means being able to accommodate said spring means; and
a stripper insert means comprising a slot means being able to accommodate and guide said floating insert means; wherein during downward stroke, the spring means being compressed so that said lever actuator means pushes the lever means down such that the lever means gets tilted so that the lancing punch actuator means moves in upward direction against the pressure of said springs for lancing operation by said punch means.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig 1 illustrates a sectional view showing mechanism for upward lancing.
Fig 2 illustrates a strip layout showing lancing operation.
Fig 3 illustrates an additional sectional view showing lancing operation.
Fig 4 illustrates an enlarged sectional view of the lancing operation.
Fig 5 illustrates a lancing punch.
Fig 6 illustrates the lancing punch actuator.
Fig 7 illustrates the lever profile.
Fig 8 illustrates the lever actuator.
Fig 9 illustrates the floating insert.
Fig 10 illustrates the stripper insert. DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
According to the invention there is provided a mechanism for upward lancing in a press tool. An improved mechanism for upward lancing in a progressive die assembly as shown in figures 1 ,3 and 4 comprises plurality of springs means(la & lb), die insert means (2), holder plate means (3), spacer (4), a lancing punch means (5), lancing punch actuator means (6), lever means (7), lever actuator means (8), floating insert means (9), and stripper insert means (10). Figure 2 shows the strip layout showing lancing operation. It is to be understood that some components which are generally present in a progressive die assembly are not described in details in the present embodiment as it will be quite evident and understood by a person skilled in the art from the figures and descriptions provided in the foregoing description.
As shown in figure 5, the lancing punch (5) is made of hardened steel. The lancing punch (5) is well guided in die insert (2) and floating in holder plate (3).
As shown in figure 6, lancing punch actuator (6) is a hardened spacer with collar construction (6a). The lancing punch actuator (6) has a substantially "T" shaped profile. The bottom face (6b) shown in figure touches the lever (7) and operates with the force of lever mechanism. The collar (6a) is provided to control the movement of lancing punch (5) with the help of spring (lb).
As shown in figure 7, the lever (7) is a hardened material located in base plate with a hinged hole (7b) for tilting action. The hinge member is a cross pin which bears the load acting at both the ends. The lever means (7) is substantially oblong shaped located on a base plate with a hinged hole (7b) which is located substantially at the center of the lever (7). The lever means (7) has been uniquely designed at its two ends having two projected arms at a predetermined angle to the horizontal having substantially rounded profile at their ends. Such unique profile provides plural point contacts (7a) which comes in contact with the lever actuator means (8). The lever is provided with a plane elevated portion having a predetermined length substantially at the center of the lever (7). The construction of lever means (7) is such that said point contacts (7a) being ensured between said lever means (7) and said actuators means (6 & 8) all the time.. Point contact (7a) also helps in reducing the friction. As shown in figure 8, the lever actuator (8) is a round member with a collar (8a). This member is in the top half of the tool and the collar (8a) rests on spring loaded stripper plate at Top Dead Center (TDC). The bottom face of actuator (8b) touches lever (7) with point contact. The lever actuator means (8) is positioned in a substantially vertical direction. The lever actuator (8) comprises a collar means (8a) , and guide means (8c). The collar means (8a) having a predetermined length and width and substantially a rectangular shape positioned in substantially horizontal direction at a predetermined distance from a top or bottom face of the lever actuator means (8).
As shown in figure 9, a hardened member called floating insert (9) is well guided in stripper insert (9) and as name indicates it is moving against spring pressure. The floating insert means (9) comprises a slot means (9a) and plurality of edges (9b). The slot means (9a) being able to accommodate said spring means (lb); Floating insert (9) performs two main functions such as gripping the strip during downward stroke of press and acts as a die for lancing operation and during upward stroke of press, the spring expands and the insert comes out of bottom surface of stripper plate & removes the lanced portion of strip out of the stripper insert. This prevents sticking of coil to stripper and ensures feeding of strip without obstruction.
As shown in figure 10, stripper insert (10) is a hardened member which guides the floating insert (9). The stripper insert means (10) comprises a slot means (10a) for accommodating and guiding the floating insert means (9).
Initially when the tool is in open condition at Top Dead Center (TDC), lever mechanism spring (la) which is in pre compressed condition and lever actuator (8) is in top position as this is a floating stripper construction. When the downward stroke takes place, this spring (la) gets further compressed and lever actuator (8) pushes the lever (7) down. The lever (7) gets tilted as it is hinged by a dowel. This pushes the lancing punch actuator (6) in upward direction against the pressure of two springs (l a & l b) and lancing operation takes place. As the Press ram or top bolster moves downward to Bottom Dead Center (BDC), these springs (la & lb) get compressed further without any relative displacement of lancing punch (5). This safeguards the punch (5) against any breakage due to extra load or press stroke variation. In upward stroke i.e. from BDC to TDC, the pressure on these two springs (l a & lb) is released and they push the lancing punch actuator (6) and lancing punch (5) in turn, downwards. The main function of spring (lb) is to control the movement of lancing punch (5) and ensure that lancing punch (5) will not obstruct strip / coil feeding. This construction ensures the balance lancing operation.
ADVANTAGES OF THE INVENTION
1. An improved mechanism takes care of breakage of lancing punch due to press stroke variation and misalignment of Press ram with respect to bottom bolster.
2. This mechanism guides the lancing punch and avoids frequent breakages of the punch due to movement of the lancing punch
3. This mechanism can be also used for upward embossing and upward bending of thin stock.
4. Ease of assembly and maintenance.
5. This mechanism is particularly effective when upward lancing is necessary and thickness of component is less.
6. This mechanism also controls the dimensional accuracy.
The invention has been described in a preferred form only and many variations may be made in the invention which will still be comprised within its spirit. The invention is not limited to the details cited above. The springs, punch, actuators, floating insert, stripper insert, die insert and holder plate as stated do not limit the scope of the present invention. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit. springs (la & lb),
die insert (2),
holder plate (3),
spacer (4),
a lancing punch (5),
lancing punch actuator (6),
collar construction (6a),
the bottom face (6b)
lever (7),
point contact (7a),
hinged hole (7b)
lever actuator (8),
collar (8a),
bottom face of actuator (8b),
guides (8c)
floating insert (9),
a slot (9a) ,
edges (9b)
stripper insert ( 10).
a slot (10a)

Claims

1. An improved mechanism for upward lancing in a progressive die assembly, said mechanism comprising:
plurality of springs means;
punch means;
punch actuator means; lever actuator means positioned in substantially vertical direction; said lever actuator comprises a collar means, and guide means wherein said collar means having a predetermined length and width and substantially a rectangular shape positioned in substantially horizontal direction at a predetermined distance from a top or bottom face of the lever actuator means ; lever means having a substantially oblong shaped being located on a base plate with a hinged hole, said hinge or pin hole means being located substantially at center of the lever; said lever means at its two ends having two projected arms at a predetermined angle to the horizontal having substantially rounded profile at their ends to define plural point contacts and a plane elevated portion having a predetermined length being located substantially at the center of the lever; said construction of lever means being such that said point contacts being ensured between said lever means and said actuators means all the time; floating insert means comprising a slot means and plurality of edges wherein said slot means being able to accommodate said spring means; and a stripper insert means comprising a slot means being able to accommodate and guide said floating insert means; wherein during downward stroke, the spring means being compressed so that said lever actuator means pushes the lever means down such that the lever means gets tilted so that the lancing punch actuator means moves in upward direction against the pressure of said springs for lancing operation by said punch means.
2. Mechanism as claimed in claim 1 , wherein said punches means being made of steel and the like materials.
3. Mechanism as claimed in claim 1 , wherein said punches means being guided in a die insert means.
4. Mechanism as claimed in claim 1 further comprising a holder plate means.
5. Mechanism as claimed in claim 1, wherein said punch actuator means having a substantially "T" shaped profile.
6. Mechanism as claimed in claim 1 , wherein said hinge member comprises a cross pin adapted to bear load acting at both the ends of the lever.
7. Mechanism as claimed in claim 1 , wherein said floating insert means is a hardened member.
8. Mechanism as claimed in claim 1 , wherein said stripper insert means is a hardened member.
9. An improved mechanism for upward lancing in a progressive die assembly as herein substantially described and illustrated with the accompanying drawings.
PCT/IB2011/002131 2010-09-30 2011-09-14 An improved mechanism for upward lancing in a progressive die assembly WO2012042326A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IN2737MU2010 2010-09-30
IN2737/MUM/2010 2010-09-30

Publications (1)

Publication Number Publication Date
WO2012042326A1 true WO2012042326A1 (en) 2012-04-05

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PCT/IB2011/002131 WO2012042326A1 (en) 2010-09-30 2011-09-14 An improved mechanism for upward lancing in a progressive die assembly

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103599989A (en) * 2013-10-23 2014-02-26 平和精工汽车配件(太仓)有限公司 Die of trunk hinge fixing seat
CN103599984A (en) * 2013-10-23 2014-02-26 平和精工汽车配件(太仓)有限公司 Trunk hinge fixed seat machining forming process
WO2014125073A1 (en) * 2013-02-15 2014-08-21 Multi-Holding Ag Device for contacting a bus bar
CN104043740A (en) * 2014-06-26 2014-09-17 梧州恒声电子科技有限公司 Progressive die structure for basin stand product
CN104438863A (en) * 2015-01-05 2015-03-25 深圳市富诚达科技有限公司 Metal piece machining mold
CN104475562A (en) * 2014-11-17 2015-04-01 宁波市奇强精密冲件有限公司 Progressive mould for spring holder
CN104492957A (en) * 2014-12-03 2015-04-08 柳州通为机械有限公司 Assembling type stamping die
JP2016043402A (en) * 2014-08-26 2016-04-04 Jfeスチール株式会社 Press forming die device
CN105710616A (en) * 2016-05-03 2016-06-29 李志联 Drawing processing method of permanent seat
CN106345904A (en) * 2016-08-31 2017-01-25 今朝联合有限公司 Progressive die for connectors
WO2017080071A1 (en) * 2015-11-13 2017-05-18 太仓旺美模具有限公司 Stamping die kit for forming bridge-shaped protrusion

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292412A (en) * 1963-12-13 1966-12-20 Amp Inc Progressive die
US4106422A (en) 1977-03-14 1978-08-15 Buhrke Industries, Inc. Method for manufacture of can end closures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292412A (en) * 1963-12-13 1966-12-20 Amp Inc Progressive die
US4106422A (en) 1977-03-14 1978-08-15 Buhrke Industries, Inc. Method for manufacture of can end closures

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014125073A1 (en) * 2013-02-15 2014-08-21 Multi-Holding Ag Device for contacting a bus bar
CN103599989A (en) * 2013-10-23 2014-02-26 平和精工汽车配件(太仓)有限公司 Die of trunk hinge fixing seat
CN103599984A (en) * 2013-10-23 2014-02-26 平和精工汽车配件(太仓)有限公司 Trunk hinge fixed seat machining forming process
CN104043740A (en) * 2014-06-26 2014-09-17 梧州恒声电子科技有限公司 Progressive die structure for basin stand product
CN104043740B (en) * 2014-06-26 2017-01-18 梧州恒声电子科技有限公司 Progressive die structure for basin stand product
JP2016043402A (en) * 2014-08-26 2016-04-04 Jfeスチール株式会社 Press forming die device
CN104475562A (en) * 2014-11-17 2015-04-01 宁波市奇强精密冲件有限公司 Progressive mould for spring holder
CN104492957A (en) * 2014-12-03 2015-04-08 柳州通为机械有限公司 Assembling type stamping die
CN104492957B (en) * 2014-12-03 2016-08-24 柳州通为机械有限公司 A kind of spliced stamping mould
CN104438863A (en) * 2015-01-05 2015-03-25 深圳市富诚达科技有限公司 Metal piece machining mold
WO2017080071A1 (en) * 2015-11-13 2017-05-18 太仓旺美模具有限公司 Stamping die kit for forming bridge-shaped protrusion
CN105710616A (en) * 2016-05-03 2016-06-29 李志联 Drawing processing method of permanent seat
CN106345904A (en) * 2016-08-31 2017-01-25 今朝联合有限公司 Progressive die for connectors

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