CN101745559B - Backward extrusion forming device for miniature precision part - Google Patents

Backward extrusion forming device for miniature precision part Download PDF

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Publication number
CN101745559B
CN101745559B CN2009103123515A CN200910312351A CN101745559B CN 101745559 B CN101745559 B CN 101745559B CN 2009103123515 A CN2009103123515 A CN 2009103123515A CN 200910312351 A CN200910312351 A CN 200910312351A CN 101745559 B CN101745559 B CN 101745559B
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CN
China
Prior art keywords
die
punch
pressure head
fixed
sleeve
Prior art date
Application number
CN2009103123515A
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Chinese (zh)
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CN101745559A (en
Inventor
董湘怀
王茹燕
马智慧
马宁
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上海交通大学
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Priority to CN2009103123515A priority Critical patent/CN101745559B/en
Publication of CN101745559A publication Critical patent/CN101745559A/en
Application granted granted Critical
Publication of CN101745559B publication Critical patent/CN101745559B/en

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Abstract

The invention discloses a backward extrusion forming device for a miniature precision part in the technical field of machining work, which comprises a die holder, a combined pressure head, a floating device, a compressing mechanism, a fixed mechanism and a demolding bolt, wherein the die holder is positioned on a worktable of equipment; the floating device and the combined pressure head are positioned in the die holder; the lower end of the fixed mechanism is movably connected with the combined pressure head; the upper end of the fixed mechanism is fixedly connected with pressure equipment; and the demolding bolt is movably arranged in the die holder and contacted with the floating device. The invention realizes high-precision guidance of a terrace die and a cavity die in the forming process and controls the forming precision of final parts.

Description

Backward extrusion forming device for miniature precision part
Technical field
The present invention relates to the plastic forming device in a kind of Machining Technology field, specifically is a kind of backward extrusion forming device for miniature precision part.
Background technology
Phenomenons such as the drip molding sidewall thickness is uneven, sidewall bottom attenuation, the out-of-flatness of extrusion mouth end face take place in the backward extrusion process of elongated deep hole thin-wall part easily; Trace it to its cause; Mainly contain following three aspects: 1. the punch lower end receives the cross force effect and lateral shift takes place and causes punch-die to lack accurate guide effect; Gap between punch and die is inhomogeneous, and the extrusion orifice material flows inhomogeneous; 2. the part bottom thickness is thin excessively, presses surplus little, does not have enough metals to add to sidewall; 3. deformable metal receives the die surface frictional influence through extrusion orifice the time, and the top layer metal flow is slow, and mid portion flows fast, and it is uneven to cause the extrusion mouth material to flow.
For miniature precision part, the problems referred to above are more outstanding, and the punch size is small, and the cross force that the punch lower end receives makes punch distortion even fracture more easily.To above-mentioned defective, conventional method is to open a technology groove at the end face of punch, and punch borrows the technology groove in the moment that begins to push blank to be bitten, and prevents that material from inhomogeneous flowing being taken place.Squint otherwise can make on the contrary when pushing in the necessary symmetrical punch center of the groove of being opened.This method is for conventional extrusion sections, and its Mould Machining precision can guarantee, but for miniature accurate backward extrusion part, the size of formation of parts is littler, and its a lot of characteristic sizes reach micron order, and traditional backward extrusion technology can't satisfy these requirements.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, a kind of backward extrusion forming device for miniature precision part is provided, can realize that the high accuracy of punch and die leads in the forming process, control final part forming precision.
The present invention realizes through following technical scheme; The present invention includes: die holder, combination pressure head, floating installation, hold-down mechanism, fixed mechanism and mould unloading bolt; Wherein: die holder is positioned on the press device workbench, and floating installation is positioned at die holder with the combination pressure head, and the lower end of fixed mechanism flexibly connects with the combination pressure head; The upper end of fixed mechanism is fixedly connected with press device, and the mould unloading bolt is movably set in the die holder bottom and contacts with floating installation.
Described combination pressure head comprises: Connection Block, die pressure head and punch; Wherein: Connection Block places die holder top; The die pressure head places in the Connection Block; The lower end of die pressure head is connected with the die contact, and punch places in the die pressure head and with the die pressure head and is fixedly connected, and the lower end of punch is positioned at the punch case tube.
Described floating installation comprises: supporting base, fixed block, push rod, die, die supporting and support spring; Wherein: supporting base is positioned at the die holder bottom, and fixed block is positioned at the upper end of supporting base, and fixed block is positioned on the supporting base; Support spring is positioned on the supporting base; The die supporting is positioned at the upper surface of support spring and matches with supporting base and fixed block respectively, and die is positioned at the upper surface of die supporting, and the top and bottom of push rod lay respectively in die and the fixed block.
Described hold-down mechanism comprises: punch sleeve and sleeve spring, wherein: the punch sleeve places in the die and with the punch contact and is connected, and sleeve spring is positioned at the upper end of punch sleeve.
Described fixed mechanism comprises: upper bolster, upper padding plate and cope match-plate pattern, and wherein: cope match-plate pattern, upper padding plate and upper bolster from top to bottom are fixedly set in the upper end of die pressure head successively, and upper bolster is connected with the last end in contact of punch.
Compared with prior art, the present invention has following beneficial effect: the present invention utilizes the precision guiding of hold-down mechanism and to the pressuring action of formation of parts, enclosed is shaped and the combination of backward extrusion technology; The miniature backward extrusion part sidewall thickness that of being shaped is even; The extrusion mouth end face is smooth, and surface quality is high, satisfies the requirement for miniature parts dimensional accuracy and form accuracy; Reduce follow-up processing, reached the purpose of precision form.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment provided detailed embodiment and operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1, present embodiment comprises: die holder 1, supporting base 2, push rod 3, die 4, punch sleeve 5, pin 6, trip bolt 7, Connection Block 8, die pressure head 9, punch 10, upper bolster 11, steady pin 12, upper padding plate 13, cope match-plate pattern 14, set bolt 15, connecting bolt 16, sleeve spring 17, blank 18, die supporting 19, fixed block 20, support spring 21, mould unloading bolt 22.Wherein supporting base 2, push rod 3, die 4, die supporting 19, fixed block 20, support spring 21 are formed floating installation; Connection Block 8, die pressure head 9, punch 10 and the 6 composition combination pressure heads of pinning; Punch sleeve 5, sleeve spring 17 are formed hold-down mechanism; Upper bolster 11, steady pin 12, upper padding plate 13, cope match-plate pattern 14, set bolt 15 and connecting bolt 16 are formed fixed mechanism.Wherein: floating installation is successively set in the working chamber of die holder 1 with the combination pressure head; Compress by trip bolt 7; Set bolt 15 is with on the fixed mechanism fixation pressure machine equipment, and mould unloading bolt 22 is arranged on die holder 1 bottom, and the top through mould unloading bolt 22 after the end that is shaped ejects floating installation.
Supporting base 2 in the described floating installation places in the working chamber of die holder 1 bottom; Fixed block 20 places the upper end of supporting base 2, and insert in fixed block 20 die cavities push rod 3 lower ends, places on the supporting base 2; Support spring 21 places on the supporting base 2 in the die holder 1 bottom working chamber; Die supporting 19 places the upper surface of support spring 21 and cooperates with supporting base 2 and fixed block 20, and die 4 places the upper surface of die supporting 19, and the die cavity of die 4 is inserted in the upper end of push rod 3.
Connection Block 8 in the described combination pressure head places in the working chamber on die holder 1 top; Die pressure head 9 places in the centre bore of Connection Block 8; Die pressure head 9 lower ends compress die 4; Pin 6 connects die pressure head 9 and punch 10, and punch 10 places in the working chamber of die pressure head 9, and the lower end of punch 10 places in the die cavity of punch sleeve 5.
Punch sleeve 5 in the described hold-down mechanism places in the working chamber of die 4, and punch 10 inserts in punch sleeve 5 die cavities, and sleeve spring 17 places the upper surface of punch sleeve 5.
Upper bolster 11 in the described fixed mechanism places the upper end of die pressure head 9; The upper end of punch 10 places in the die cavity of upper bolster 11; Upper padding plate 13 places the upper end of upper bolster 11; Cope match-plate pattern 14 places the upper end of upper padding plate 13, and upper bolster 11, upper padding plate 13, cope match-plate pattern 11 are fixed through steady pin 12, and connect with connecting bolt 16.Fixed mechanism is fixed on the press equipment through set bolt 15.
The available high-temperature vacuum environment of present embodiment is: 1200 ℃ of maximum heating temperatures, the hot vacuum 5 * 10 of full load -3Pa; The maximum load power that can provide is 20KN, is the displacement of pressing head precision an indicating value? .5%; The machining accuracy of convexity of the present invention, die is: profile errors≤± 1.5 μ m, machined surface roughness≤0.05 μ m.The present invention under the high-temperature vacuum environment that former provides, can be used for formation of parts largest contours size less than 1mm as a kind of miniature parts precision plastic forming mould structure, and part feature is of a size of micron-sized bulk forming class part.
Present embodiment is assembling in the following manner specifically: successively supporting base 2, push rod 3, die 4, die supporting 19, fixed block 20, support spring 21 are assembled the working chamber of putting into die holder 1; Again blank 18 is put into the working chamber of die 4; Punch sleeve 5 is put into the working chamber of die 4, and sleeve spring 17 places on the upper surface of punch sleeve 5; Again Connection Block 8, die pressure head 9, pin 6, punch 10, upper bolster 11 are assembled the working chamber of putting into die holder 1 top; Fixing with trip bolt 6, prevent that floating installation, combination pressure head from ejecting; With steady pin 12 that upper padding plate 13, cope match-plate pattern 14 is fixing with upper bolster 11, and with connecting bolt 16 connections, will install with press equipment with set bolt 15 at last and fix.Forming process: the cope match-plate pattern 14, upper padding plate 13, the upper bolster 11 that are fixed in press equipment are pressed onto on the die pressure head 9, make die 4 and die supporting 19 move downward, and support spring 21 is compressed; Simultaneously punch 10 since the connection effect of pin 6 also along with die pressure head 9 moves downward; Through 18 distortion of punch sleeve 5 guiding compression blanks, blank 18 bottom attenuation, the barrel height increases; The extrusion mouth material promotes to move on the punch sleeve 5; Sleeve spring 17 is compressed, and the compression stress of sleeve spring 17 affacts on the extrusion mouth blank through punch sleeve 5, and blank 18 is filled at the enclosure space of being made up of die 4, punch 10, punch sleeve 5.The pin 6 that finishes back connection die pressure head 9 and punch 10 that is shaped slips in the narrow groove of Connection Block 8; The inefficacy that is connected of punch 10 and die pressure head 9; Punch 10 is along with the press equipment backhaul; The compression force that formation of parts receives sleeve spring all the time rests on the upper surface of push rod 3, separates with punch 10 at last.Unload mold process after be shaped finishing: unclamp set bolt 15, trip bolt 7, can accomplish the dismounting of whole shaped device through support spring 21 and mould unloading bolt 22.
The precision of the miniature precision part that the machining accuracy of the outer wall of the die cavity at die 4 centers, punch 10 lower ends, the inside and outside wall of punch sleeve 5 and quality of fit and needs are shaped is complementary; The machining accuracy of the outline of die 4 and die holder 1 and quality of fit can adopt conventional accurately machined precision, and the processing of other auxiliary spare part and quality of fit also can adopt conventional accurately machined precision.In the course of the work, the guiding movement of the conventional precision of the high-precision building motion of punch, die and punch sleeve and other auxiliary spare part is harmonious, guarantees the shaping and the demoulding of miniature precision part.

Claims (1)

1. backward extrusion forming device for miniature precision part; Comprise: die holder, combination pressure head, floating installation, hold-down mechanism, fixed mechanism and mould unloading bolt; It is characterized in that: die holder is positioned on the press device workbench, and floating installation is positioned at die holder with the combination pressure head, and the lower end of fixed mechanism flexibly connects with the combination pressure head; The upper end of fixed mechanism is fixedly connected with press device, and the mould unloading bolt is movably set in the die holder bottom and contacts with floating installation;
Described combination pressure head comprises: Connection Block, die pressure head and punch; Wherein: Connection Block places die holder top; The die pressure head places in the Connection Block; The lower end of die pressure head is connected with the die contact, and punch places in the die pressure head and with the die pressure head and is fixedly connected, and the lower end of punch is positioned at the punch case tube;
Described floating installation comprises: supporting base, fixed block, push rod, die, die supporting and support spring; Wherein: supporting base is positioned at the die holder bottom, and fixed block is positioned at the upper end of supporting base, and fixed block is positioned on the supporting base; Support spring is positioned on the supporting base; The die supporting is positioned at the upper surface of support spring and matches with supporting base and fixed block respectively, and die is positioned at the upper surface of die supporting, and the top and bottom of push rod lay respectively in die and the fixed block;
Described hold-down mechanism comprises: punch sleeve and sleeve spring, and wherein: the punch sleeve places in the die and with the punch contact and is connected, and sleeve spring is positioned at the upper end of punch sleeve;
Described fixed mechanism comprises: upper bolster, upper padding plate and cope match-plate pattern, and wherein: cope match-plate pattern, upper padding plate and upper bolster from top to bottom are fixedly set in the upper end of die pressure head successively, and upper bolster is connected with the last end in contact of punch.
CN2009103123515A 2009-12-28 2009-12-28 Backward extrusion forming device for miniature precision part CN101745559B (en)

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Application Number Priority Date Filing Date Title
CN2009103123515A CN101745559B (en) 2009-12-28 2009-12-28 Backward extrusion forming device for miniature precision part

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Application Number Priority Date Filing Date Title
CN2009103123515A CN101745559B (en) 2009-12-28 2009-12-28 Backward extrusion forming device for miniature precision part

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CN101745559B true CN101745559B (en) 2012-04-25

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101947567B (en) * 2010-08-31 2012-08-29 江苏浩瀚汽车标准件有限公司 Processing technique of flat-head hexagon bolt for cold extrusion shaping cart
CN102699087B (en) * 2012-06-04 2014-09-24 秦皇岛北方管业有限公司 Partition board forming device for air supply straight blowing pipe of blast furnace
CN102873122A (en) * 2012-10-26 2013-01-16 昆山集智成模具有限公司 Solid section backward extrusion device
CN104607489A (en) * 2015-01-26 2015-05-13 上海理工大学 Micro-forward-extrusion forming device and process for conical head rod piece
CN106862290B (en) * 2017-02-24 2018-05-25 中北大学 A kind of cup shell backward extrusion forming device and manufacturing process
CN107377652A (en) * 2017-08-16 2017-11-24 浙江长华汽车零部件有限公司 Efficiently strong extrusion cold forming mould

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1456401A (en) * 2003-06-23 2003-11-19 北京科技大学 Amorphous alloy precision parts superplastic drop-forging shaper and method thereof
CN1554499A (en) * 2003-12-23 2004-12-15 哈尔滨工业大学 Mini floating mold device for mini part precision formation
CN101332476A (en) * 2008-08-01 2008-12-31 河南科技大学 Precise extrusion molding method of thin wall long-pipe shaped parts bland and special mould
CN101543867A (en) * 2009-04-30 2009-09-30 上海交通大学 Double orientation self-ejection miniature precision part plastic forming device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1456401A (en) * 2003-06-23 2003-11-19 北京科技大学 Amorphous alloy precision parts superplastic drop-forging shaper and method thereof
CN1554499A (en) * 2003-12-23 2004-12-15 哈尔滨工业大学 Mini floating mold device for mini part precision formation
CN101332476A (en) * 2008-08-01 2008-12-31 河南科技大学 Precise extrusion molding method of thin wall long-pipe shaped parts bland and special mould
CN101543867A (en) * 2009-04-30 2009-09-30 上海交通大学 Double orientation self-ejection miniature precision part plastic forming device

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