CN107081400B - A kind of mold for hollow blank backward extrusion hollow object - Google Patents
A kind of mold for hollow blank backward extrusion hollow object Download PDFInfo
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- CN107081400B CN107081400B CN201710516964.5A CN201710516964A CN107081400B CN 107081400 B CN107081400 B CN 107081400B CN 201710516964 A CN201710516964 A CN 201710516964A CN 107081400 B CN107081400 B CN 107081400B
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- punch
- movable punch
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- mold
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- 238000001125 extrusion Methods 0.000 title claims abstract description 51
- 239000007787 solid Substances 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000008685 targeting Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention relates to a kind of molds for hollow blank backward extrusion hollow object, including lower die, upper mold two parts, its main feature is that the punch-pin of part of the upper die is made of solid punch and movable punch, flash gutters are provided in solid punch, and formed with movable punch and be closed type groove, to accommodate the overlap generated in the gap between solid punch and movable punch；The present invention can enough complete backward extrusion in same mold, Upsetting squeezes two procedures；Its flash gutters improves mold flexibility ratio and reliability, realizes the figuration manufacture of bottom difference size hole hollow object, enhances mold versatility, improve production efficiency, reduce production cost.
Description
Technical field
The invention belongs to metal material extrusion die, more particularly to a kind of section of the bottom with centre bore that be mainly used for is
Round, more circles, rectangular, rectangular hollow object reverse extrusion figuration manufacture, suitable for metal material it is cold, warm, be hot extruded into
Shape.
Background technology
Extrusion process is modern age metal as non-ferrous metal, one of the technique of steel material production and part forming processing
A kind of advanced manufacturing method in plastic processing.As the extruding of further plastic working, it is mainly used for the production of part.Backward extrusion
The hollow parts that manufacture section is circle, multi-layer circular, rectangular, rectangle etc. are primarily adapted for use in, relatively broad open has been obtained
Hair and application.
The hollow object of centre bore is carried for bottom, traditional handicraft is machining base apertures after solid blank backward extrusion.
And solid blank backward extrusion method, for large-size workpiece, plastic force is big, affects die life and forming accuracy；Bottom
Deflection is small, causes workpiece bottom performance relatively low；It is also desirable to follow-up machining process.
It solves the above problems to overcome, the hollow object of centre bore is carried for bottom, has researched and proposed that hollow blank is counter to be squeezed
Pressure method." a kind of labor-saving automobile hub forming method and device (CN1864915A) ", a kind of " diameter disclosed in Chinese patent
To-reversed Compound Extrusion forming magnesium alloy heavy burden wheel disc technique and device (2015102017001) " in have been mentioned and apply.However, for using hollow object of the hollow blank backward extrusion method contoured bottom with centre bore, traditional structure of extrusion is
Its requirement cannot be met, it is also difficult to reach above-mentioned desired effect.
Currently, the mold applied to hollow blank backward extrusion, there are mainly two types of structures.One kind is convex using monoblock type
Non-movable mandrel is carried in mould or punch-pin, " a kind of labor-saving automobile hub forming method and device as disclosed in Chinese patent
(CN1864915A) " the building mortion being related to uses this kind of structure.And it is another for using convex with being servo-actuated in punch-pin
Mould, the building mortion that (2015102017001) are related to as disclosed in Chinese patent use this kind of structure.
In use, discovery is primarily present problems with to above two mold：
(1) solid punch with inactive mandrel is used, cavity plate height is increased and mold is closed height, demoulded after forming
With pickup difficulty, one timing of press open height, institute's energy formed hollow part length is restricted；
(2) using the solid punch for being set with servo-actuated punch-pin, since there are gaps between solid punch and movable punch, easily
It generates overlap and clamping stagnation occurs, directly affect the flexibility ratio and reliability of mold, affect the continuity and efficiency of work；
(3) indirect-extrusion mould of both forms can not change workpiece bottom when mandrel (or servo-actuated punch-pin) size determines
Portion's central hole size, mold poor universality, low production efficiency, production cost are high.
Invention content
The purpose of the present invention is intended to give full play to the advantage of hollow blank extrusion forming method, overcomes the prior art and presence
Deficiency, propose a kind of to improve the hollow for hollow blank backward extrusion of the flexibility ratio of mold, versatility and reliability
The mold of part.
To achieve the above object, the technical scheme is that：
A kind of mold for hollow blank backward extrusion hollow object, including lower die, upper mold two parts；Wherein：Lower die
Part is made of lower template 1, mandril 2, jacking block 3, cavity plate 4；The cavity plate is located on lower template, by screw, pin under
Template connects, and mandril is placed in lower template, and jacking block is placed in cavity plate, in lower template；Part of the upper die is by cope plate 8, backing plate 7, convex
Mould, cover board 9 form；Its main feature is that：The punch-pin is made of solid punch 6 and movable punch 5, and the solid punch is located at pad
It under plate, cope plate, is connect with backing plate by screw, pin and cope plate, movable punch is placed in solid punch, and cover board passes through
Screw, pin and movable punch connect；Wherein：
● solid punch is retracted together with movable punch, and hollow blank 10 is placed in mold, first, backward extrusion workpiece
11, then, then Upsetting squeezes Forming Workpiece 12；
● when backward extrusion, movable punch actively ejects, and is placed in hollow blank endoporus, the bottom surface and top of movable punch
Block upper surface contacts, at this point, solid punch backward extrusion hollow blank shapes；
● when Upsetting is extruded into shape, movable punch is retracted, and the bottom surface of movable punch is concordant with solid punch bottom surface；Solid punch
Hollow blank forming is squeezed with Upsetting together with movable punch, i.e. the hole of workpiece 11 reduces；
●Upsetting is squeezedAfter the completion of forming, solid punch is retracted together with movable punch；
● the workpiece 12 for taking Upsetting to be extruded into shape is pushed up by mandril 2 and jacking block 3；
Its main feature is that：Further include flash gutters being provided in the solid punch, and formed with movable punch and be closed type groove,
To accommodate the overlap generated in the gap between solid punch and movable punch；The determination of its flash gutters key dimension：
B1=H5- (10~20) mm；
H1=(2~5) mm；
Wherein：The cavity of solid punch and the working portion length of fit of movable punch are H5；The length of flash gutters be b1,
Depth is h1, fillet R.
Its main feature is that：The movable punch is divided into working portion and targeting part, and suit activity is provided in solid punch
The cavity of punch-pin, the determination of solid punch and movable punch key dimension：
D3=d5；D3=d- (2~10) mm；H3=H+ (5~10) mm；D4=d6；
If workpiece bottom centre bore dia is larger, does not need follow-up Upsetting and squeeze process, then the working portion of movable punch is straight
Diameter d3=d1；
If workpiece bottom centre bore dia is smaller, follow-up Upsetting is needed to squeeze process after extruding, then the work department of movable punch
Divide length H3=H5；
Wherein：The internal diameter for the hollow blank that backward extrusion uses is H, the hollow object bottom of backward extrusion for d, highly
Center-hole diameter is d1；Or internal diameter is d, outer diameter D, be highly H hollow blank, hollow object bottom centre bore dia is
d1；A diameter of d3 of the working portion of movable punch, the working portion length of movable punch are H3, the targeting part of movable punch
A diameter of d4；The a diameter of d5 of cooperation, the length of fit H5 of the cavity of solid punch and the working portion of movable punch, fixation are convex
The cavity of mould and the targeting part cooperation diameter d6 of movable punch.
The present invention compared with the prior art, substantive technical characterstic and significantly has the technical effect that：
Backward extrusion, Upsetting extruding two procedures can be completed in same mold, can realize that bottom difference size hole is hollow
The figuration manufacture of part enhances mold versatility, improves production efficiency, reduces production cost；
Flash gutters are set on solid punch, solve between solid punch and movable punch there are gap easily produced by overlap
And the problem of clamping stagnation occurs, improve mold flexibility ratio and reliability；
Movable punch is used, cavity plate height is reduced and mold is closed height, convenient for demoulding and pickup, in same press
The hollow object of upper formable larger lengths.
Description of the drawings
Fig. 1 is the hollow blank indirect-extrusion mould schematic diagram of the present invention；
Fig. 2 is the mold schematic diagram that the hollow blank backward extrusion of the present invention is squeezed with Upsetting；
Fig. 3 is solid punch and flash gutters schematic diagram；
Fig. 4 is movable punch schematic diagram.
Fig. 5 is hollow object reverse extrusion process schematic representation；
Fig. 6 is Upsetting extruding process schematic diagrames after hollow object reverse extrusion；
Specific implementation mode
Specific implementation mode is described in detail below in conjunction with attached drawing (the present embodiment be to the present invention furtherly
It is bright, rather than to any restriction of the invention made).
Shown in Fig. 1 and Fig. 2, a kind of mold for hollow blank backward extrusion hollow object of the invention, including lower die, on
Mould two parts；Wherein：Part of the lower die is made of lower template 1, mandril 2, jacking block 3, cavity plate 4；The cavity plate is located on lower template,
It is connected by screw, pin and lower template, mandril is placed in lower template, and jacking block is placed in cavity plate, in lower template；Part of the upper die by
Cope plate 8, backing plate 7, punch-pin, cover board 9 form；Its main feature is that：The punch-pin is made of solid punch 6 and movable punch 5,
The solid punch is located at backing plate, under cope plate, is connect with backing plate by screw, pin and cope plate, movable punch is placed in
In solid punch, cover board is connected by screw, pin and movable punch.The movable punch movement and position can be controlled
System.
Shown in Fig. 2, the mold schematic diagram of hollow blank backward extrusion of the invention and Upsetting extruding；The mold of the present invention, it is hollow
The contoured squeeze process of part includes：Backward extrusion is squeezed with Upsetting.Wherein：
● solid punch is retracted together with movable ejector die, and hollow blank 10 is placed in mold, first, backward extrusion work
Part 11, then, then Upsetting squeezes Forming Workpiece 12；Backward extrusion is completed in same mold, Upsetting squeezes two procedures；
● when backward extrusion, movable punch actively ejects, and is placed in hollow blank endoporus, the bottom surface and top of movable punch
Block upper surface contacts, at this point, solid punch backward extrusion hollow blank shapes；
● when Upsetting is extruded into shape, movable punch is retracted, and the bottom surface of movable punch is concordant with solid punch bottom surface；Solid punch
Hollow blank forming is squeezed with Upsetting together with movable punch, i.e. the hole of workpiece 11 reduces；
● Upsetting is extruded into after the completion of shape, and solid punch is retracted together with movable punch；
● the workpiece 12 for taking Upsetting to be extruded into shape is pushed up by mandril 2 and jacking block 3；
Shown in Fig. 3, flash gutters are provided in the solid punch, and formed with movable punch and be closed type groove, to hold
Receive the overlap generated in the gap between solid punch and movable punch；The determination of its flash gutters key dimension：
B1=H5- (10~20) mm；
H1=(2~5) mm；
Wherein：The cavity of solid punch and the working portion length of fit of movable punch are H5；The length of flash gutters be b1,
Depth is h1, fillet R.
Shown in Fig. 4, the movable punch is divided into working portion and targeting part, and it is convex that suit activity is provided in solid punch
The cavity of mould, the determination of solid punch and movable punch key dimension：
D3=d5；D3=d- (2~10) mm；H3=H+ (5~10) mm；- d4=d6；
If workpiece bottom centre bore dia is larger, does not need follow-up Upsetting and squeeze process, then the working portion of movable punch is straight
Diameter d3=d1；
If workpiece bottom centre bore dia is smaller, follow-up Upsetting is needed to squeeze process after extruding, then the work department of movable punch
Divide length H3=H5；
Wherein：The internal diameter for the hollow blank that backward extrusion uses is H, the hollow object bottom of backward extrusion for d, highly
Center-hole diameter is d1；Or internal diameter is d, outer diameter D, be highly H hollow blank, hollow object bottom centre bore dia is
d1；The working portion of movable punch'sA diameter of d3, movable punch working portion length be H3, movable punch'sTargeting part
A diameter of d4；The a diameter of d5 of cooperation, the length of fit H5 of the cavity of solid punch and the working portion of movable punch, fixation are convex
The cavity of mould and movable punch targeting part cooperation diameter d6.
Such as：According to inventive die and relative dimensions design determine method, determine movable punch, solid punch it is main
Size is as follows：
(1) the working portion diameter d3 of bottom centre's bore dia 260mm, movable punch are taken as 260mm, i.e. d3=d1, long
Degree H3 is taken as 150mm, i.e. H3=H+10mm；The targeting part diameter d4 of movable punch is taken as 120mm；
(2) the cooperation diameter d5 of the working portion of solid punch and movable punch is taken as 260mm, i.e. d5=d3, length H3
It is taken as 150mm, the targeting part cooperation diameter 120mm with movable punch；
(3) flash gutters are provided on solid punch, overlap slot length b1 is taken as 130mm, and overlap groove height h1 is taken as 3mm.
It is hollow object for a kind of application of mold for hollow blank backward extrusion hollow object of the invention shown in Fig. 5
Reverse extrusion process schematic representation.Be d by internal diameter, outer diameter D, be highly H hollow blank 10, extrusion molding be bottom in
Heart bore dia is the workpiece 11 of d1.Workpiece 11 bottom centre bore dia 260mm, hollow blank 10 outer diameter 420mm, internal diameter 270mm,
Height 140mm.
It is hollow object for a kind of application of mold for hollow blank backward extrusion hollow object of the invention shown in Fig. 6
Upsetting extruding process schematic diagram after reverse extrusion.Be d by internal diameter, outer diameter D, be highly H hollow blank 10, first extrusion molding is
Bottom centre's bore dia is the workpiece 11 of d1, and rear Upsetting squeezes the workpiece 12 for being configured to that bottom centre's bore dia is d2.12 bottom of workpiece
Center-hole diameter 140mm, hollow blank 10 outer diameter 420mm, internal diameter 270mm, height 140mm.
Claims (3)
1. a kind of mold for hollow blank backward extrusion hollow object, including lower die, upper mold two parts；Wherein：Lower mold portion
Divide and is made of lower template (1), mandril (2), jacking block (3), cavity plate (4)；The cavity plate is located on lower template, passes through screw, pin
Nail is connect with lower template, and mandril is placed in lower template, and jacking block is placed in cavity plate, in lower template；Part of the upper die by cope plate (8),
Punch-pin, backing plate (7), cover board (9) composition；It is characterized in that:The punch-pin is made of solid punch (6) and movable punch (5)
, the solid punch is located at backing plate, under cope plate, is connect with backing plate by screw, pin and cope plate, movable punch is set
In in solid punch, cover board is connected by screw, pin and movable punch；Wherein：
● solid punch is retracted together with movable punch, and hollow blank (10) is placed in mold, first, backward extrusion workpiece
(11), then, then Upsetting squeezes Forming Workpiece (12)；
● when backward extrusion, movable punch actively ejects, and is placed in hollow blank endoporus, on the bottom surface and jacking block of movable punch
End face contacts, at this point, solid punch backward extrusion hollow blank shapes；
● when Upsetting is extruded into shape, movable punch is retracted, and the bottom surface of movable punch is concordant with solid punch bottom surface；Solid punch and work
Upsetting squeezes hollow blank forming to dynamic punch-pin together, i.e. the hole of workpiece (11) reduces；
● Upsetting is extruded into after the completion of shape, and solid punch is retracted together with movable punch；
● the workpiece (12) for taking Upsetting to be extruded into shape is pushed up by mandril (2) and jacking block (3).
2. a kind of mold for hollow blank backward extrusion hollow object according to claim 1, it is characterised in that:Also
Including being provided with flash gutters in the solid punch, and formed with movable punch and be closed type groove, to accommodate solid punch with
The overlap generated in gap between movable punch；The determination of its flash gutters key dimension：
B1=H5- (10~20) mm；
H1=(2~5) mm；
Wherein：The cavity of solid punch and the working portion length of fit of movable punch are H5；The length of flash gutters is b1, depth
For h1, fillet R.
3. a kind of mold for hollow blank backward extrusion hollow object according to claim 1, it is characterised in that:Institute
It states movable punch and is divided into working portion and targeting part, the cavity of suit movable punch is provided in solid punch, fix convex
The determination of mould and movable punch key dimension：
D3=d5；
D3=d- (2~10) mm；
H3=H+ (5~10) mm；
D4=d6；
If workpiece bottom centre bore dia is larger, does not need follow-up Upsetting and squeeze process, then the working portion diameter d3 of movable punch
=d1；
If workpiece bottom centre bore dia is smaller, follow-up Upsetting is needed to squeeze process after extruding, then the working portion of movable punch is long
Spend H3=H5；
Wherein：The internal diameter for the hollow blank that backward extrusion uses is H, the hollow object bottom centre of backward extrusion for d, highly
Bore dia is d1；The a diameter of d3 of working portion of movable punch, the working portion length of movable punch are H3, and movable punch is led
It is d4 to section diameter；The cavity of solid punch and the working portion of movable punch coordinate a diameter of d5, length of fit H5, Gu
The targeting part of the cavity and movable punch of determining punch-pin coordinates a diameter of d6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710516964.5A CN107081400B (en) | 2017-06-29 | 2017-06-29 | A kind of mold for hollow blank backward extrusion hollow object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710516964.5A CN107081400B (en) | 2017-06-29 | 2017-06-29 | A kind of mold for hollow blank backward extrusion hollow object |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107081400A CN107081400A (en) | 2017-08-22 |
| CN107081400B true CN107081400B (en) | 2018-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710516964.5A Expired - Fee Related CN107081400B (en) | 2017-06-29 | 2017-06-29 | A kind of mold for hollow blank backward extrusion hollow object |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108927417B (en) * | 2018-05-24 | 2020-06-19 | 北京航星机器制造有限公司 | Hot extrusion forming die and forming method for special-shaped deep-cavity complex-structure support |
| CN108941980B (en) * | 2018-08-16 | 2020-08-25 | 中国兵器工业第五九研究所 | Preparation method of welding wire for aluminum-magnesium alloy casting |
| CN109079074A (en) * | 2018-08-16 | 2018-12-25 | 湘潭大学 | A kind of plate forging forming method and its mold that metalwork bottom thickens |
| CN112453092A (en) * | 2020-11-14 | 2021-03-09 | 中国兵器科学研究院宁波分院 | Integral extrusion forming die and method for thin-wall shell with inner ring rib |
| CN115041536A (en) * | 2022-08-16 | 2022-09-13 | 中北大学 | Extrusion forming die and method for conical cabin with end frame |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864915A (en) * | 2006-06-13 | 2006-11-22 | 中北大学 | A labor-saving automobile hub forming method and device |
| 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 |
| CN101829698A (en) * | 2010-03-30 | 2010-09-15 | 河南科技大学 | Extrusion forming process of thin-wall long pipe-shaped part blank with flange and mould |
| CN104874626A (en) * | 2015-04-24 | 2015-09-02 | 中北大学 | Process and device for forming magnesium alloy loading wheel disc through combined extruding in radial direction and reverse direction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5699040A (en) * | 1980-01-14 | 1981-08-10 | Suzuki Motor Co Ltd | Die for manufacturing flanged hollow product |
| JPS6040642A (en) * | 1983-08-12 | 1985-03-04 | Sakamura Seiatsu Kk | Manufacture of middle recessed hollow cylinder |
| JPH0691339A (en) * | 1992-09-14 | 1994-04-05 | Nagoya Giken Kogyo Kk | Method for cold-heading formed product for joint metallic fixture |
-
2017
- 2017-06-29 CN CN201710516964.5A patent/CN107081400B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864915A (en) * | 2006-06-13 | 2006-11-22 | 中北大学 | A labor-saving automobile hub forming method and device |
| 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 |
| CN101829698A (en) * | 2010-03-30 | 2010-09-15 | 河南科技大学 | Extrusion forming process of thin-wall long pipe-shaped part blank with flange and mould |
| CN104874626A (en) * | 2015-04-24 | 2015-09-02 | 中北大学 | Process and device for forming magnesium alloy loading wheel disc through combined extruding in radial direction and reverse direction |
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| CN107081400A (en) | 2017-08-22 |
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