CN102921947A - Improved structure of powder metallurgy die - Google Patents
Improved structure of powder metallurgy die Download PDFInfo
- Publication number
- CN102921947A CN102921947A CN2012104694258A CN201210469425A CN102921947A CN 102921947 A CN102921947 A CN 102921947A CN 2012104694258 A CN2012104694258 A CN 2012104694258A CN 201210469425 A CN201210469425 A CN 201210469425A CN 102921947 A CN102921947 A CN 102921947A
- Authority
- CN
- China
- Prior art keywords
- powder metallurgy
- former
- core rod
- metallurgy die
- lead angle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Abstract
The invention relates to an improved structure of a powder metallurgy die, which comprises a female die jacket (11) and a female die core (12), wherein the female die jacket (11) is arranged on the female die core (12) in a sleeving manner to form an integral structure; and a helical oil groove (13) is formed in the annular inside surface of the female die jacket (11) and forms a hot oil loop with externally-connected temperature-controllable hot oil. The improved structure of the powder metallurgy die is characterized in that a demolding guide angle (beta) is formed in an opening of the female die core (12). The improved structure of the powder metallurgy die has the beneficial effects that as the demolding guide angle is formed at the opening of the female die core (12), the great shearing force generated by elastic release in the process of demolding a blank out of the die can be reduced through the demolding guide angle; and the shearing force is a main reason for leading the blank to generate a transverse crack, so that a green blank is protected against crack.
Description
Technical field
The present invention relates to a kind of powder metallurgy die, especially relate to a kind of powder metallurgy die and improve structure.
Background technology
Powder metallurgy is to produce metal dust and by the processing method of the techniques such as moulding and sintering with the mixture making articles of metal dust or non-metal powder, both can produce the special material that is difficult to produce with common method of smelting, can make again the machine components of various precisions, labor and material saving.
For there is the heating raw materials of powder metallurgy die inner chamber in mould, or play the effect of temperature control, need to heat or temperature control to powder metallurgy die.To so far, mainly contain the mode of two kinds of mold heated in the Powder Metallurgy Industry: adopt the mode of heating rod or electromagnetic induction heating and the mode of heating of employing deep fat overcoat.
Specifically, the following several structures of available technology adopting:
As shown in Figure 1, the first structure is: former 1 open counterbore and in inlay heating rod 2, the mode by heating rod 2 heating heats up mould gradually.The electrical heating failure mode mainly contains the following aspects: 1) electrical bar is fragile when dismounting, and certain circuit in several hot pins is blown need to diagnostic mode and replacing; 2) thermocouple is fixed on the mould, is subject to vibrations, impacts, dismantles and damage.
As shown in Figure 2, the second structure is: inlay electromagnetic heating system 3 in former 1 bottom surface, by electromagnetic induction mould is heated up.
As shown in Figure 3, the third structure is: at former 1 overcoat 4 is set, gives in the overcoat 4 and inject deep fat.Deep fat heats to former 1 by heat conducting mode.
As shown in Figure 4, the 4th kind of structure is: be provided with a carriage 5 in former 1 bottom, be provided with the deep fat groove in carriage 5, deep fat carries out heat exchange by deep fat groove and the former 1 of carriage 5.Sealing between former 1 and the carriage 5 realizes by the deadweight of groove along upper sealing ring and former 1.
Analyze the characteristics of above several modes from heating source, heat conduction efficiency, temperature gradient distribution and temperature feedback:
The first structure and the second structure technology defective are: need to increase measurement and the feedback that thermocouple carries out temperature on the former, heating arrangement is complicated; The thermograde of mould is very large; Temperature feedback is difficult to accurately, and control causes temperature fluctuation larger.
There is following defective in the third structure by the heating of deep fat die sleeve: the heat conduction is distant, have the gap between die sleeve and the former, so pyroconductivity is lower, heats up slower; There is the larger temperature difference between heating die sleeve and the former; The heating die sleeve directly contacts with mould bases, can cause mould bases to produce the harmful effects such as thermal deformation.
There is following defective in the 4th kind of structure by the heating of deep fat mould kerve: this mode not only has all shortcomings of first kind of way, also needs sealing ring, has the sealing ring problem of aging.In addition, during mould, groove will expose fully, easily fall into foreign material in needs are changed or repaired.
In addition, also there is a technological deficiency in existing powder metallurgy die: when pressed compact is deviate from from the former core rod, the residual stress that is retained in pressed compact inside can be discharged, linear scale is about 0.2%, stress can be discharged the moment when pressed compact is deviate from middle die orifice section, the shape of die orifice will affect the rate of release of stress and strain, particularly for the larger-size and density of product design higher (ρ〉6.8 g/cm
3) product.Therefore, when pressed compact was deviate from from mould, residual stress can cause pressed compact to crack, and badly influences the quality of pressed compact product.
Summary of the invention
The present invention has designed a kind of powder metallurgy die and has improved structure, the technical problem of its solution be that the heating arrangement of (1) existing powder metallurgy die is complicated, heating-up temperature is inhomogeneous, pyroconductivity is lower and mould bases because of uneven be out of shape etc. that be heated; When (2) pressed compact in the existing powder metallurgy forming mold was deviate from from mould, residual stress can cause pressed compact to crack, and badly influences the quality of pressed compact product.
In order to solve the technical problem of above-mentioned existence, the present invention has adopted following scheme:
A kind of powder metallurgy die improves structure, comprise former overcoat (11) and former core rod (12), described former overcoat (11) is enclosed within the upper overall structure that forms of described former core rod (12), have helical oil groove (13) in the ring-shaped inner part surface of former overcoat (11), described helical oil groove (13) forms a deep fat loop with external controllable temperature deep fat, it is characterized in that: be provided with demoulding lead angle (β) at former core rod (12) opening part.
Further, described demoulding lead angle (β) forms an inverted trapezoidal structure at the axial cross section of described former core rod (12), 10.5 °≤demoulding lead angle (β)＜11.5 °, a limit of described demoulding lead angle (β) is parallel with the axis of former core rod (12), and another limit of described demoulding lead angle (β) is the hypotenuse of inverted trapezoidal structure.
Further, inlet nozzle (14), in-line (16), oil outlet (15) and fuel-displaced pipeline (17) all are arranged on the former overcoat (11).
Further, in-line (16) is communicated with on the helical oil groove (13) of extreme higher position.
Further, fuel-displaced pipeline (17) is communicated with on the helical oil groove (13) of extreme lower position.
Further, described former overcoat (11) and described former core rod (12) interference fit.
This powder metallurgy die improves structure and compares with existing powder metallurgy die, has following beneficial effect:
(1) the present invention is owing to being provided with demoulding lead angle at former core rod opening part; this demoulding lead angle can reduce pressed compact and deviate from the significant shear power that produces because of elasticity release the process from mould; this shearing force is to cause pressed compact to produce the main cause of transversal crack, thereby has protected green compact that crackle does not occur.
(2) deep fat among the present invention circulates in helical oil groove, directly acts on the former core rod, and the efficiency of heating surface is high, and the annex of whole system has reduced to the limit, the mold temperature that control that therefore can be desirable needs.
(3) compare with the heating of traditional deep fat, the present invention is owing to designing a helical oil groove and forming the deep fat loop at the inner diameter surfaces place of former overcoat, thereby heat conduction efficiency is high, and firing rate is fast, and the thermograde of former core rod is little, has hardly the temperature difference; Simultaneously, the waste of heat energy is few.
(4) the present invention is owing to designing a helical oil groove and forming the deep fat loop at the inner diameter surfaces place of former overcoat, compares with the traditional electrical heating to have: the one, and thermograde is little, and uniformity is fabulous; The 2nd, the controlled range of temperature is very constant, and temperature fluctuation is little; The 3rd, can play the effect of former cooling, prevent the mould superheating phenomenon that external cause causes.
(5) mould structure that the present invention relates to is simple, does not need extra heating element heater or heat conduction accessory, and seals by former overcoat and the generation of former core rod interference fit, thereby under higher pressure, sealing is fabulous, can not produce the phenomenon of leakage.
(6) the present invention is owing to designing a helical oil groove and forming the deep fat loop at the inner diameter surfaces place of former overcoat, the dimensional stability of the former after causing heating is than stable many of electrical heating and traditional oils heating, thereby the product size of producing is stable and quality is good.
Description of drawings
Fig. 1 is the schematic diagram of the first powder metallurgy die heating arrangement in the prior art;
Fig. 2 is the schematic diagram of the second powder metallurgy die heating arrangement in the prior art;
Fig. 3 is the schematic diagram of the third powder metallurgy die heating arrangement in the prior art;
Fig. 4 is the schematic diagram of the 4th kind of powder metallurgy die heating arrangement in the prior art;
Fig. 5 is the schematic diagram that powder metallurgy die of the present invention improves structure;
Fig. 6 is that powder metallurgy die of the present invention improves the demoulding lead angle position view in the structure.
Description of reference numerals:
1-former; 2-heating rod; 3-electromagnetic heating system; 4-overcoat; 5-carriage; 51-groove; 11-former overcoat; 12-former core rod; 13-helical oil groove; 14-inlet nozzle; 15-oil outlet; 16-in-line; 17-fuel-displaced pipeline; β-demoulding lead angle.
The specific embodiment
Below in conjunction with Fig. 5, the present invention will be further described:
As shown in Figure 5, powder metallurgy die of the present invention improves structure, comprises former overcoat 11 and former core rod 12, former overcoat 11 and former core rod 12 interference fit.Ring-shaped inner part surface at former overcoat 11 arranges helical oil groove 13, and helical oil groove 13 forms a deep fat loop with external controllable temperature deep fat.
The deep fat loop also comprises inlet nozzle 14, in-line 16, oil outlet 15 and fuel-displaced pipeline 17, and inlet nozzle 14, in-line 16, oil outlet 15 and fuel-displaced pipeline 17 all are arranged on the former overcoat 11.In-line 16 is communicated with on the helical oil groove 13 of extreme higher position.Fuel-displaced pipeline 17 is communicated with on the helical oil groove 13 of extreme lower position.
Operation principle is as follows:
External controllable temperature deep fat flow through successively inlet nozzle 14, in-line 16, helical oil groove 13, fuel-displaced pipeline 17 and oil outlet 15, and move in circles.Deep fat acts directly on former core rod 12 materials of mould, realizes direct heat conduction heating.Have quick, even, stable heating effect, can effectively improve mould obdurability, improve mould dimensional accuracy and stability, stablize the raw material blank to the uniformity of mould frictional interface, thereby the quality of raising die life and product.
In addition, be provided with demoulding lead angle β at former core rod 12 opening parts.Demoulding lead angle β forms an inverted trapezoidal structure at the axial cross section of former core rod 12,10.5 °≤demoulding lead angle β＜11.5 °, the limit of demoulding lead angle β is parallel with the axis of former core rod 12, and another limit of described demoulding lead angle β is the hypotenuse of inverted trapezoidal structure.This demoulding lead angle can reduce pressed compact and deviate from the significant shear power that produces because of elasticity release the process from mould, and this shearing force is to cause pressed compact to produce the main cause of transversal crack, thereby has protected green compact that crackle does not occur.
The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obvious realization of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; or without improving design of the present invention and technical scheme are directly applied to other occasion, all in protection scope of the present invention.
Claims (7)
1. a powder metallurgy die improves structure, comprise former overcoat (11) and former core rod (12), described former overcoat (11) is enclosed within the upper overall structure that forms of described former core rod (12), have helical oil groove (13) in the ring-shaped inner part surface of former overcoat (11), described helical oil groove (13) forms a deep fat loop with external controllable temperature deep fat, it is characterized in that: be provided with demoulding lead angle (β) at former core rod (12) opening part.
2. described powder metallurgy die improves structure according to claim 1, it is characterized in that: described demoulding lead angle (β) forms an inverted trapezoidal structure at the axial cross section of described former core rod (12), 10.5 °≤demoulding lead angle (β)＜11.5 °, a limit of described demoulding lead angle (β) is parallel with the axis of former core rod (12), and another limit of described demoulding lead angle (β) is the hypotenuse of inverted trapezoidal structure.
3. described powder metallurgy die improves structure according to claim 1 and 2, it is characterized in that: described deep fat loop also comprises inlet nozzle (14), in-line (16), oil outlet (15) and fuel-displaced pipeline (17), external controllable temperature deep fat flow through successively inlet nozzle (14), in-line (16), helical oil groove (13), fuel-displaced pipeline (17) and oil outlet (15).
4. described powder metallurgy die improves structure according to claim 3, and it is characterized in that: inlet nozzle (14), in-line (16), oil outlet (15) and fuel-displaced pipeline (17) all are arranged on the former overcoat (11).
According to claim 3 or 4 described powder metallurgy dies improve structures, it is characterized in that: in-line (16) is communicated with on the helical oil groove (13) of extreme higher position.
6. described powder metallurgy die improves structure according to claim 5, and it is characterized in that: fuel-displaced pipeline (17) is communicated with on the helical oil groove (13) of extreme lower position.
According to claim 1 in 6 any one described powder metallurgy die improve structure, it is characterized in that: described former overcoat (11) and described former core rod (12) interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104694258A CN102921947A (en) | 2012-11-20 | 2012-11-20 | Improved structure of powder metallurgy die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104694258A CN102921947A (en) | 2012-11-20 | 2012-11-20 | Improved structure of powder metallurgy die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102921947A true CN102921947A (en) | 2013-02-13 |
Family
ID=47636952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104694258A Pending CN102921947A (en) | 2012-11-20 | 2012-11-20 | Improved structure of powder metallurgy die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102921947A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317741A (en) * | 2020-09-14 | 2021-02-05 | 扬州钰能精密机械科技有限公司 | Mixed powder metallurgy die with cooling water channel and cooling air duct |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005009575A (en) * | 2003-06-19 | 2005-01-13 | Sumitomo Denko Shoketsu Gokin Kk | Oil impregnation bearing and method of manufacturing oil impregnation bearing |
| CN1565779A (en) * | 2003-06-25 | 2005-01-19 | 中南大学 | Warm press used die for lubricating die wall |
| CN201008974Y (en) * | 2006-12-29 | 2008-01-23 | 上海汽车粉末冶金有限公司 | Compacting mould for powder metallurgy |
| CN201940605U (en) * | 2011-02-17 | 2011-08-24 | 成都图南电子有限公司 | Female mould for bonding neodymium iron boron magnet compression molding |
| CN202291404U (en) * | 2011-10-20 | 2012-07-04 | 傅叶平 | Water-cooled mould for powder metallurgy |
| CN202479493U (en) * | 2011-10-21 | 2012-10-10 | 苏州中鼎冶金有限公司 | Liquid nitrogen cooling structure of powder metallurgy mold |
-
2012
- 2012-11-20 CN CN2012104694258A patent/CN102921947A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005009575A (en) * | 2003-06-19 | 2005-01-13 | Sumitomo Denko Shoketsu Gokin Kk | Oil impregnation bearing and method of manufacturing oil impregnation bearing |
| CN1565779A (en) * | 2003-06-25 | 2005-01-19 | 中南大学 | Warm press used die for lubricating die wall |
| CN201008974Y (en) * | 2006-12-29 | 2008-01-23 | 上海汽车粉末冶金有限公司 | Compacting mould for powder metallurgy |
| CN201940605U (en) * | 2011-02-17 | 2011-08-24 | 成都图南电子有限公司 | Female mould for bonding neodymium iron boron magnet compression molding |
| CN202291404U (en) * | 2011-10-20 | 2012-07-04 | 傅叶平 | Water-cooled mould for powder metallurgy |
| CN202479493U (en) * | 2011-10-21 | 2012-10-10 | 苏州中鼎冶金有限公司 | Liquid nitrogen cooling structure of powder metallurgy mold |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317741A (en) * | 2020-09-14 | 2021-02-05 | 扬州钰能精密机械科技有限公司 | Mixed powder metallurgy die with cooling water channel and cooling air duct |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105014071A (en) | Metal laser selective melting forming double-piston controllable preheating powder cylinder | |
| Xiao et al. | Development of a rapid thermal cycling molding with electric heating and water impingement cooling for injection molding applications | |
| JP6123753B2 (en) | Electromagnetic induction heating mold equipment for molding and vulcanization of rubber packing | |
| CN106312067A (en) | Graphite die for pressureless spark plasma sintering | |
| CN104959509A (en) | Combined die with temperature regulated in segmented and independent mode through numerical control | |
| CN102921947A (en) | Improved structure of powder metallurgy die | |
| CN107129133A (en) | Silicate glass free form surface forming machine and forming method | |
| CN201120678Y (en) | Core waterway structure for manufacturing optical lens | |
| CN202555818U (en) | Novel powder metallurgy die heating structure | |
| CN103008655B (en) | A kind of powder metallurgy die | |
| CN206264238U (en) | A kind of mould synchronous cooling device | |
| CN102964056A (en) | Continuous workpiece molding equipment and method | |
| CN104959614A (en) | Shaping method and shaping die for ferrum-based powder metallurgy rotor or gear products | |
| CN106946443A (en) | A kind of mechanical compensation 3D glass heaters | |
| KR20120095175A (en) | Device molding press with which cooling part having thermoelectric and heating part having positive temperature coefficient | |
| CN203409247U (en) | Device for thermoforming gradient material | |
| CN103302730A (en) | Once shaping method for graphite heating element and special mold thereof | |
| CN105108961A (en) | Insulating bushing pressing die | |
| JP6762732B2 (en) | Multi-axis current sintering equipment | |
| CN209176057U (en) | A kind of injection mold of automobile instrument dial | |
| CN108322946B (en) | Electric heating type full-closed loop heating device | |
| Vu et al. | Numerical modeling-based design of the newly developed nonisothermal glass molding process for complex glass optics | |
| CN205394999U (en) | Round filter screen injection mold | |
| CN204504127U (en) | Isothermal forging φ 900-2000mm upper/lower die closed assembly induction heater | |
| CN205291470U (en) | A equipment for cell -phone card support injection forming |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130213 |