CN108188325B - Cold heading forming folding-preventing die for thin-wall workpiece - Google Patents

Cold heading forming folding-preventing die for thin-wall workpiece Download PDF

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Publication number
CN108188325B
CN108188325B CN201810213759.6A CN201810213759A CN108188325B CN 108188325 B CN108188325 B CN 108188325B CN 201810213759 A CN201810213759 A CN 201810213759A CN 108188325 B CN108188325 B CN 108188325B
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China
Prior art keywords
floating
female die
die
combined linkage
punch
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CN108188325A (en
Inventor
吴艳云
刘铭心
张东民
陈剑
李嘉伟
刘红涛
朱景秋
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Shanghai Institute of Technology
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Shanghai Institute of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/02Dies or mountings therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08Upsetting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/64Making machine elements nuts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention discloses a cold heading forming anti-folding die for a thin-wall workpiece, which comprises an upper punch, a combined linkage female die, a lower punch, an elastic element and a base, wherein the upper punch is arranged on the upper punch; the elastic element is arranged on the base and used for floatingly supporting the combined linkage female die; the upper end face of the combined linkage female die is provided with an upper spigot, and a central through hole at the lower end is in clearance fit with the lower punch; the shape of the upper punch is matched with that of the upper spigot; when the upper punch descends to the upper spigot and continues to descend, the upper punch drives the combined linkage female die to descend and compress the elastic element, so that the blank is formed in a floating manner in a closed cavity formed by the upper punch, the lower punch and the combined linkage female die; when the upper punch drives the combined linkage female die to compress the elastic element to move downwards to the base, a part head cavity is formed between the upper punch and the combined linkage female die, and a part thin-wall cavity is formed between the lower punch and the combined linkage female die. The invention can fill the blank to the thin-wall area, prevent the material from folding and realize high-efficiency and high-quality processing of the thin-wall structure workpiece.

Description

Cold heading forming folding-preventing die for thin-wall workpiece
Technical Field
The invention belongs to the technical field of cold heading forming, and particularly relates to a cold heading forming folding-preventing die for a thin-wall workpiece.
Background
The traditional production process is to finish the whole workpiece by adopting a cold heading main body and turning a thin-wall area, the turning wastes materials, the clamping and cutting time is required, the efficiency is low, the cost is high, and the service life of the workpiece is low; the novel process is manufactured by adopting a cold heading forming process, the service life of a product is high, the cost is low, but because materials in a thin-wall area are not easy to fill, the problem of insufficient filling and material folding often occurs in a forming area, and a common cold heading processing die mechanism cannot process the product with the thin-wall structure with high efficiency and high quality.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a cold heading forming anti-folding die for a thin-wall workpiece.
The technical scheme adopted by the invention is as follows:
a cold heading forming anti-folding die for a thin-wall workpiece comprises an upper punch, a combined linkage female die, a lower punch, an elastic element and a base; the elastic element is arranged on the base and used for floatingly supporting the combined linkage female die; the upper end face of the combined linkage female die is provided with an upper spigot, and a central through hole at the lower end is in clearance fit with the lower punch; the shape of the upper punch is matched with that of the upper spigot; when the upper punch descends to the upper spigot and continues to descend, the upper punch drives the combined linkage female die to descend and compress the elastic element, so that a closed cavity formed by the upper punch, the lower punch and the combined linkage female die is formed in a floating mode; when the upper punch drives the combined linkage female die to compress the elastic element to move downwards to the base, a part head cavity is formed between the upper punch and the combined linkage female die, and a part thin-wall cavity is formed between the lower punch and the combined linkage female die.
Optionally, the combined linkage female die comprises a floating female die, a floating mold core and a floating base; the floating base is floatingly supported by the elastic element; the floating die core is positioned in the floating die and is in interference fit with the floating die; a lower spigot is arranged in the floating female die and used for limiting the floating die core to move upwards; the floating female die and the floating die core are fixedly supported by the floating base, and the floating female die is embedded into the floating base; the upper spigot is formed on the upper end face of the floating female die.
Optionally, the top of the lower punch is spherical, an annular step is formed below the top, and the annular step and the floating die core form the thin-wall die cavity of the workpiece.
Optionally, the upper punch, the floating die core, the floating base, the base and the lower punch are all coaxially arranged.
Optionally, the floating female die, the floating mold core and the floating base are of an integrated structure.
Optionally, the elastic element is a belleville spring, and a plurality of belleville springs are uniformly distributed and used for floating supporting the combined linkage female die.
Compared with the prior art, the invention has the beneficial effects that:
the folding-preventing die is applicable to manufacturing by a cold heading forming process, and has high strength and low cost;
the combined linkage female die provided by the invention is a combined body, and the strength of the female die is effectively improved due to the adoption of the prestress female die;
the combined linkage female die comprises a floating female die, a floating die core and a floating base, wherein the floating female die, the floating die core and the floating base are linked during cold heading forming, when an upper punch and an upper spigot on the combined linkage female die are completely closed, the upper punch and the combined linkage female die jointly extrude blanks to move downwards together, meanwhile, the spherical top of a lower punch starts to contact a workpiece, and the workpiece starts to deform; in the closed area, the combined linkage female die, the blank and the lower punch which float downwards together extrude, the blank plastically flows to form a thin-wall area, the filling resistance is small, and folding is avoided;
the blank of the thin-wall part produced by the anti-folding die provided by the invention has uniform deformation speed, is full of charge and stable in quality, and is suitable for mass production of parts such as thin-wall structures.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a cross-sectional view of an anti-fold mold according to an embodiment of the present invention;
FIG. 2 is an elevation view of a thin-walled article according to an embodiment of the present invention;
fig. 3 is an inverted view of a thin-walled article according to an embodiment of the present invention.
In the figure, 1-upper punch; 2-floating female die; 3-floating mold cores; 4-floating base; a 5-elastic element; 6-a base; 7-lower punch.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, a cold heading forming anti-folding die for thin-walled workpieces comprises an upper punch 1, a combined linkage female die, a lower punch 7, an elastic element 5 and a base 6. The combined linkage female die is supported in a floating manner by an elastic element 5 arranged on a base 6, and the upper punch 1 presses down the floating combined linkage female die; a sliding guide is formed between the lower punch 7 and the combined linkage female die, so that the stability of the lower punch 7 in the stamping process can be ensured; when the combined linkage female die is pressed down to the base 6, the blank is finally formed into a thin-wall workpiece in a closed cavity formed by the upper punch 1, the combined linkage female die and the lower punch 7.
Further, the plurality of elastic elements 5 are uniformly arranged on the base 6 and used for floatingly supporting the combined linkage female die and ensuring that the combined linkage female die is in a balanced state in the floating process. The upper end face of the combined linkage female die is provided with an upper spigot, and the upper punch 1 is matched with the upper spigot in shape. The central through hole at the lower end of the combined linkage female die is in clearance fit with the lower punch 7. When the upper punch 1 descends to the upper spigot and continues to descend, the upper punch 1 drives the combined linkage female die to descend and compress the elastic element 5, so that the movement precision and accuracy of the die are ensured, and the blank is formed in a floating mode in a closed cavity formed by the upper punch, the lower punch and the combined linkage female die. When the upper punch 1 drives the combined linkage female die to descend to lean against the base 6, a workpiece head cavity is formed between the upper punch 1 and the combined linkage female die, and a workpiece thin-wall cavity is formed between the lower punch 7 and the combined linkage female die, so that the blank is finally compressed to form a thin-wall workpiece.
The invention relates to a thin-walled nut (shown in fig. 2 and 3), which is a product of one working procedure in the forming process, but is not limited to the process. Among them, the billet is preferably 25 gauge steel, 35 gauge steel, or 35CrMo alloy steel.
The invention adopts a two-layer combined female die form according to the extrusion force working condition requirement, and has the advantages that: under the condition of the same outline size of the female die and the same size of the cavity, the structure strength is high.
In one embodiment of the invention, the combined ganged die comprises a floating die 2, a floating die core 3 and a floating base 4. The floating die core 3 is positioned in the floating die 2 and is in interference fit with the floating die 2. The floating base 4 is floatingly supported by the elastic element 5, the floating die 2 and the floating die core 3 are fixedly supported by the floating base 4, and the floating die 2 is embedded in the floating base 4. The upper end surface of the floating die 2 forms an upper spigot which is used for being matched with the upper punch 1. The floating female die 2 is internally provided with a lower spigot which is used for limiting the floating die core 3 to shift, namely limiting the floating die core 3 to ascend. In the design, when the upper punch 1 is pressed down, the floating female die 2, the floating die core 3 and the floating base 4 are linked, wherein sliding guide is formed between the floating die core 3 and the lower punch 7, and the stability of the lower punch 7 in the punching process is ensured. The combined linkage female die adopts a combined body form, and when some components fail, other components are not affected, so that the replacement cost is reduced. The floating die core 3 and the floating die 2 are in interference fit, so that a prestress die is formed, longitudinal cracks of the die are prevented, and the strength of the die is improved. The combined linkage female die can also adopt other forms of combined bodies to form other types of thin-wall parts by cold heading.
In one embodiment of the invention, the top of the lower punch 7 is spherical, an annular step is formed below the top, and the annular step and the floating die core 3 form a thin-wall die cavity of the workpiece. In the design, when the upper punch 1 and the upper spigot of the combined linkage female die are completely closed, the upper punch 1 and the combined linkage female die jointly extrude blanks to move downwards together, and meanwhile, the spherical top of the lower punch 7 starts to contact with a workpiece, and the workpiece starts to deform; in the closed area, the combined linkage female die, the blank and the lower punch 1 which float downwards together extrude, the blank plastically flows to form a thin-wall area, the filling resistance is small, the folding is avoided, the deformation speed of the blank is uniform, and the filling in the thin-wall cavity of the workpiece is full.
In one embodiment of the invention, the upper punch 1, the floating die 2, the floating die core 3, the floating mount 4, the base 6 and the lower punch 7 are all coaxially arranged.
In one embodiment of the invention, the elastic element 5 is a belleville spring, and a plurality of belleville springs are uniformly distributed and used for floating support of the combined linkage female die.
The working mode of the anti-folding die of the embodiment of the invention is as follows:
the upper punch 1 moves downwards under the pressure of the cold header, the workpiece does not deform before the upper punch 1 and the combined linkage female die are closed, and the combined linkage female die is at a floating upper position; when the upper punch 1 and the upper spigot of the combined linkage female die are completely closed, the upper punch 1 and the combined linkage female die jointly extrude a blank and move downwards together, and meanwhile, the spherical top of the lower punch 7 starts to contact with a workpiece, and the workpiece starts to deform; in the closed area, the combined linkage female die, the blank and the lower punch 7 which float downwards together are extruded, the blank is plastically formed in the thin-wall area by flow, and the mold has small filling resistance and avoids folding; the floating distance of the combined linkage female die is controlled by the elastic element 5, the combined linkage female die and the base 6 are beaten together at the end of the cold heading stroke, the extrusion molding of the workpiece is finished, the cold heading machine stops applying pressure, the upper punch 1 is retracted upwards, the elastic element 5 generates a reset force, the combined linkage female die is reset, and the lower punch 7 moves upwards to eject the molded workpiece, so that the whole molding process is completed.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (1)

1. The cold heading forming anti-folding die for the thin-wall workpiece is characterized by comprising an upper punch, a combined linkage female die, a lower punch, an elastic element and a base; the elastic element is arranged on the base and used for floatingly supporting the combined linkage female die; the upper end face of the combined linkage female die is provided with an upper spigot, and a central through hole at the lower end is in clearance fit with the lower punch; the shape of the upper punch is matched with that of the upper spigot; when the upper punch head descends to the upper spigot and continues to descend, the upper punch head drives the combined linkage female die to descend and compress the elastic element, when the upper punch head drives the combined linkage female die to compress the elastic element to descend to the base, a part head cavity is formed between the upper punch head and the combined linkage female die, and a part thin-wall cavity is formed between the lower punch head and the combined linkage female die;
the combined linkage female die comprises a floating female die, a floating die core and a floating base; the floating base is floatingly supported by the elastic element; the floating die core is positioned in the floating die and is in interference fit with the floating die, and sliding fit guide is formed between the floating die core and the lower punch; a lower spigot is arranged in the floating female die and used for limiting the floating die core to move upwards; the floating female die and the floating die core are fixedly supported by the floating base, and the floating female die is embedded into the floating base; the upper spigot is formed on the upper end surface of the floating female die;
the top of the lower punch is spherical, an annular step is formed below the top, and the annular step and the floating die core form the thin-wall die cavity of the workpiece;
the upper punch, the floating female die, the floating die core, the floating base, the base and the lower punch are all coaxially arranged;
the elastic elements are disc springs, and a plurality of disc springs are uniformly distributed and used for floatingly supporting the combined linkage female die.
CN201810213759.6A 2018-03-15 2018-03-15 Cold heading forming folding-preventing die for thin-wall workpiece Active CN108188325B (en)

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Application Number Priority Date Filing Date Title
CN201810213759.6A CN108188325B (en) 2018-03-15 2018-03-15 Cold heading forming folding-preventing die for thin-wall workpiece

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Application Number Priority Date Filing Date Title
CN201810213759.6A CN108188325B (en) 2018-03-15 2018-03-15 Cold heading forming folding-preventing die for thin-wall workpiece

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CN108188325B true CN108188325B (en) 2024-01-30

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113042672A (en) * 2021-03-29 2021-06-29 重庆大学 Large-thickness-difference plate part stamping die structure and forming process

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1158087A (en) * 1997-08-27 1999-03-02 Honda Motor Co Ltd Compacting device
CN101306443A (en) * 2007-05-15 2008-11-19 张华文 Vehicle oil pump bracket spline processing die
CN102248108A (en) * 2011-06-01 2011-11-23 西安建筑科技大学 Straight gear precision forging forming device with controllable floating female die movement
CN103567340A (en) * 2013-11-26 2014-02-12 山东建筑大学 Novel precision forging technology of straight toothed spur gear for automobile and mold
CN103639227A (en) * 2013-12-09 2014-03-19 哈尔滨工业大学 Die and method for manufacturing ultrathin-wall small cylinder part
CN106001360A (en) * 2016-06-16 2016-10-12 上海交通大学 Thin-wall part progressive upset forming mold and forming method
CN106903247A (en) * 2017-05-09 2017-06-30 哈尔滨工业大学(威海) Miniature turbine disk building mortion and method
CN208004723U (en) * 2018-03-15 2018-10-26 上海应用技术大学 A kind of thin wall parts cold upset forming anti-fold mold

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1158087A (en) * 1997-08-27 1999-03-02 Honda Motor Co Ltd Compacting device
CN101306443A (en) * 2007-05-15 2008-11-19 张华文 Vehicle oil pump bracket spline processing die
CN102248108A (en) * 2011-06-01 2011-11-23 西安建筑科技大学 Straight gear precision forging forming device with controllable floating female die movement
CN103567340A (en) * 2013-11-26 2014-02-12 山东建筑大学 Novel precision forging technology of straight toothed spur gear for automobile and mold
CN103639227A (en) * 2013-12-09 2014-03-19 哈尔滨工业大学 Die and method for manufacturing ultrathin-wall small cylinder part
CN106001360A (en) * 2016-06-16 2016-10-12 上海交通大学 Thin-wall part progressive upset forming mold and forming method
CN106903247A (en) * 2017-05-09 2017-06-30 哈尔滨工业大学(威海) Miniature turbine disk building mortion and method
CN208004723U (en) * 2018-03-15 2018-10-26 上海应用技术大学 A kind of thin wall parts cold upset forming anti-fold mold

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