CN1827344A - Mold pin for mold of working plastic material - Google Patents
Mold pin for mold of working plastic material Download PDFInfo
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- CN1827344A CN1827344A CN 200510048300 CN200510048300A CN1827344A CN 1827344 A CN1827344 A CN 1827344A CN 200510048300 CN200510048300 CN 200510048300 CN 200510048300 A CN200510048300 A CN 200510048300A CN 1827344 A CN1827344 A CN 1827344A
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- pin
- mold
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- mold pin
- shell
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Abstract
The invention is to provide a mold improving heat dissipation without disadvantageously affecting a life. A molding pin for working a plastic material, a molding pin such as a molding pin, a core pin, an ejecting pin and the like of a mold for injection-molding the plastic in particular, has at least one mold portion such as a molding plate partitioning a space of the mold or an inserting mold piece. The mold portion contains at least one guide notch to accept a rod-like mold pin 21 such as the ejecting pin or the core pin each relatively movable to the guide notch. The mold pin (21) has a steel-made outer skin (44) equipped with a hole (28) in the axial direction at least in the partial range in the axial direction. The pin core (31) of a highly thermally-conductive material is mounted in the hole (28) in the axial direction. The pin outer skin (44) and the pin core (31) entangle with each other, while forming a durable bonding portion without clearance between the outer peripheral surface (34) of the pin core (31) and the inner peripheral surface (37) of the pin outer skin (44).
Description
Technical field
The present invention relates to a kind ofly,, be used for particularly using on the injection mould at the mould of working plastic material as mould pin, core pin, knock pin or the like by claim 1 mold pin as described in the preamble.
Background technology
Be to be discharged into heat in the mould by liquid liquation and from mould, to discharge and realize that moulded parts cools off uniformly in the problem that exists aspect the mould of the described type of beginning.The cooling duct that is arranged in the mould is not enough all the time under special applicable cases.Therefore for example moulded parts is difficult to evenly be cooled off.Along with piling up as this material of blind hole deposit or the dome that spins the stress and the crackle that cause goods to be scrapped usually appears particularly.
What have no data available from document is known in the state of the art, and processing for example has the mould of the knock pin of being made up of this high conductivity material of beryllium copper, so that can discharge heat from die cavity better by this way.This beryllium copper knock pin is openly used by DreiS-Werk company.But beryllium copper knock pin can only be processed with very poor machinability.Its corrosivity liquation of being subject to for example use in flame retardant plastics corrodes in addition.The shortcoming of beryllium copper knock pin is in addition, and service life is quite short because scuff resistance is not enough.
For avoiding these shortcomings, this patent searcher has carried out test widely.Wherein, steel knock pin that is provided with an axial hole is provided with the copper core of a contraction.Test shows, is impossible being fixedly connected on the whole axial length to small part of effect diametrically between copper core and the outer steel shell, thereby do not have uniform combination.Because mold pin comes into the market as standard component usually, just at first shorten to specific length, also must cooperate operating position separately shorten once more then by die casting producer, thus on the plane of shortening inhomogeneities as can be seen.This inhomogeneities not only make between thermal conductivity reduction and core and the shell be connected insufficient, and they also show the inhomogeneities of part on copper core that shrinks and the contact-making surface between the outer steel shell, particularly form unallowed depression position in the injection-molded item of making.
Known from DE 196 32 507 A1, in the axial hole of a sleeve pipe, guide knock pin.This structure can only play the effect that is easy to change wear-out part, but can not discharge heat from mould.
Known from WO 94/26496, in the axial hole of an ejection sleeve, guide knock pin.The purpose of this structure is that the hole of shrinking by means of the taper of ejection sleeve reaches the wearing and tearing that reduce knock pin.Adopt this disclosed structure not reach and discharge heat better.
Known from DE 44 39 984 C1, in the zone of the inside molded surface of forming by composite to small part, make the permanent mo(u)ld of metal casting, plastic castings and glass foundry goods.Wherein, superficial layer has a kind of low heat conductivity but the material of high-temperature sudden change and high-wearing feature.Yet this composite of being made up of the material of extremely different thermal coefficient of expansions just is difficult to make.Their shortcoming is dimensional stability and service life.
At last from the known a kind of injection-moulding nozzle of DE 694 03 513 T2, its torpedo shape pipe (Torpedo) is made by outside steel bushing, and the latter is provided with copper gasket, and does not mention the combination between steel and the copper in this regard.
Summary of the invention
The disclosed application of mentioning is from the outset set out, and the objective of the invention is to, and a kind of mold pin is provided, and wherein, improves thermal conductivity, service life and strength characteristics thereof.
The present invention is by the feature of claim 1, particularly the feature by its characteristic reaches this purpose, be that mold pin has a steel shell district, it is provided with an axial hole at least on an axial subregion, the pin core of being made by high conductivity material is set in described axial hole, wherein, the material of shell region and pin core is rabbeted under the situation that forms lasting and seamless connectivity between the internal valve of the shell surface of pin core and pin shell interlacedly.
Therefore principle of the present invention mainly is, mold pin for example knock pin or core pin is provided with one by wear-resisting, that can well cut and to the material of the temperature jump sensitivity shell made of steel for example around this core at whole axial length or wherein have the core of being made by high conductivity material on the part.Wherein, the material of core and the material of shell are rabbeted interlacedly, that is to say, these materials can or also can interconnect by means of the metal combination lastingly and seamlessly by adhesion, mechanical engagement.
The invention has the advantages that owing to the core of being made by high conductivity material, heat is obviously particularly derived from the other problems zone as blind hole or the dome that spins this material accumulation portion and moulded parts better.By wear-resisting and the material of temperature jump sensitivity for example guaranteed mold pin high service life in the steel shell zone of making.In addition, process also simple than prior art because steel has good machinability.Utilize the circulation timei that has obviously shortened forming process according to mold pin of the present invention.
Closely and seamlessly interconnect on the whole axial length of mold pin by the material of pin core and the material of pin shell, the syndeton on this space is only because its very good strength characteristics just is suitable as the mould pin standard component of core pin and knock pin just very much.Not only the radially shortening face that adds man-hour but also form in use of standard component-also in abrasive disc (Anschliff)-all show a kind of gapless transition between core material and the sheathing material.Therefore in this zone-roughly different with the contraction structure of above-mentioned test-in by standard component of the present invention, deposit in the plastic products of making in other cases depression position anything but with the form formation that is difficult to accept.
The present invention uses Dr.Betz GmbH, and the MECOBOND method of 45478 M ü lheim (DE) companies is used for the mfg. moulding die pin.The problems referred to above when utilizing this method can avoid under having the metal situation of different heat expansion coefficient, making composite.In this method, apply a pressure that surpasses the yield point of at least a material in two kinds of materials when cooling off two kinds of materials, thereby this material-at least in film micro area-plastic deformation.Pressure also can only be applied to targetedly on one of two kinds of materials-for example only be applied on the pin core of being made up of copper or copper alloy at this.
The MECOBOND method has introduction in DE 102 29 994 C1, wherein, the document not suggestion uses this method to be used to make the favourable particular manufacturing craft pin by the present invention.Specifically, the MECOBOND method relates to a kind of three-dimensional composite with at least two kinds of materials of different heat expansion coefficient, and wherein, this composite is when it is made and/or heat treatment time heating and cooling then.During cooling composite is through a temperature interval, two kinds of materials are under the solid-state polymerization state in this interval, and apply one to composite during through the temperature interval and be higher than the uniform pressure that one of them plants the hot yield point of material, thereby this material plastic deformation in film micro area at least.
According to another embodiment of the present invention, the pin core is made of copper or copper alloy.The advantage of copper is high thermal conductivity, thereby heat can be derived from the hot difficult point zone of mould best and very targetedly.Can realize even cooling frame product by this way.Alloy instead of Copper, pin core also can selectively be made of copper alloy or other high conductivity material.
For a kind of like this structure, the special provision of MECOBOND method, be that copper or copper alloy are made under the situation that the lasting metal of formation is connected by high temperature-high-pressure metal diffusion process with the composite between the tool steel, wherein, temperature is set between 850 ℃ and 1200 ℃, and pressure is set in 100 * 10
5Pa and 5000 * 10
5Between the Pa.
Another kind of constitute according to of the present invention, axial hole seals by means of steel plate on the end regions of cavity side at least.Because mold pin is a kind of standard component that shortens to the length that requires, so the pin core can contact with the corrosivity moulding material in the zone of the opening of the cavity side of axial hole.For preventing this point, the opening of axial hole seals by steel plate.Steel plate for example can be by means of being welded to connect on the outer steel shell that is secured in mold pin.
Another kind of constitute according to of the present invention, axial hole seals by means of coating on the end regions of cavity side at least.This coating can for example be made by the laser built-up welding by built-up welding.Axial hole is sealed shut in cavity side at least by this way, thereby liquation can not contact with material cores.
According to another kind of formation of the present invention, the cooling duct is set adjacent to mold pin.Can be to carrying out water-cooled by means of the cooling duct with the mold pin adjacent areas, thus can very directly be discharged into the cooling duct and from mould, discharge from mould with by the heat that liquation absorbs by mold pin.
According to another kind of embodiment, axial hole extends on the whole axial region of mold pin.By this way, the pin core that highly heat-conductive material is made can be set on the whole axial length of mold pin.
According to another kind of formation of the present invention, the pin core extends on the whole axial region of mold pin.Mold pin is provided with axial hole then on its whole length, this axial hole is filled by the pin core fully.Therefore can absorb heat on whole Jie's length areas of mold pin from mould and be discharged to other zones, heat energy for example can be discharged in cooling water or the extraneous air on these zones.
According to another kind of formation of the present invention, the pin core extends on the whole axial subregion of mold pin.With mold pin be on its whole axial region or only to be provided with the hole on a subregion irrelevant, can only in a subregion of mold pin, the pin core be set.If for example only in a subregion of mold pin, need heat extraction, just can be this situation.In addition, for example owing to the intensity reason, mold pin only has axial hole and is provided with the pin core in a subregion.
According to another kind of formation of the present invention, mold pin has the minimum diameter of 10mm.Because the strength characteristics of copper is not as steel, so utilize this minimum diameter to guarantee the sufficient intensity of mold pin.
Description of drawings
Draw other advantages of the present invention by the following description to the embodiment shown in the accompanying drawing.Wherein:
Fig. 1 schematically illustrates the longitudinal section of the injection mould that has mold pin of the present invention;
Fig. 2 illustrates the single component diagram by the mold pin of Fig. 1; And
Fig. 3 schematically illustrates by the subregional part longitudinal section of the mold pin of local I II among Fig. 2.
The specific embodiment
Be used in the accompanying drawing on the mold integral of working plastic material with Reference numeral 10 marks.Also represent corresponding parts under the situation of identical Reference numeral additional lowercase in different accompanying drawings.
Mould 10 has a sole plate 11 and a template 12 according to Fig. 1 in nozzle side.Mould 10 is provided with a sole plate 13, two 14,15, templates 16 of stripper fixed head and cores 17 in demoulding side.This outer mold 10 has stripper plate 18 and 19.Transverse arm 20a and 20b support shuttering 16 are to prevent the bending owing to the mould inside pressure that occurs.Mold pin 21 is fixed on the sole plate 13 and passes stripper fixed head 14 and 15, mold fixed plate 16 and template 17, thereby the end regions 36 of mold pin 21 is arranged in the die cavity 41.
At nozzle side fixed mould pin 24,25 on template 12, it is used for the dome 26 and 27 and can be called shaping pin or core pin of shaping mould product 38.So the end regions 45 and 46 of mold pin 24 and 25 stretches in the die cavity 41.
Fig. 2 illustrates the mold pin 21 as single parts.The structure of mold pin 21 is as broad as long basically with the structure of the mold pin 24 that has the moulding function equally and 25.According to sealed connection of internal valve 37 materials of shell surface 34 with the pin shell 44 of Fig. 2 pin core 31, wherein, between the internal valve 37 of the shell surface 34 of pin core 31 and pin shell 44, have metal and connect.For making this connection, use Dr.BetzGmbH, the MECOBOND method of 45478 M ü lheim (DE).In this method, the pressure that applies above its yield point to copper pin core 31, thereby the plastic deformation and reach gapless with the steel pin shell 44 of mold pin 21 and be connected in film micro area at least of this pin core.Copper pin core 31 makes mold pin 21 have very good thermal conductivity.In addition, guarantee very good wearability by steel pin shell.The MECOBOND method has introduction in DE 102 29 994 C1.
According to Fig. 1, mould 10 is in moulded parts 38 and is about to before the demoulding, and wherein, the plastics liquation injects in the die cavity 41 by a sprue gate 40 by means of the nozzle 39 that has heated before this.Particularly come from the interior plastics liquation heat energy in dome 26 and 27 zones by means of cooling duct 42a, the 42b, 42c and the 43d that very rapidly are discharged to the water-cooled that is provided with mold pin 24 and 25 direct neighbors by mold pin 24 of the present invention and 25.Particularly come from the interior heat energy in moulded parts 38 blind holes 23 zones by discharging and be discharged into the extraneous air to the direction of sole plate 13 from die cavity 41 by mold core 21 of the present invention.
For preventing that corrosivity plastics liquation from corroding pin core 31,32 and 33, axial hole 28,29 and 30 injection moulding side opening 47,48,49 apply by laser stacks layer 35a, 35b, 35c separately.Replace corresponding laser stacks layer, also it is contemplated that in the soldering that produces same favourable protection effect or for example by means of the steel plate on the laser weld.Pin shell 44,50 and 51 constitutes by having the good heatproof degree mutability and the steel of bending resistance.
Although in order to exist pin core 31,32 and 33 still to guarantee the enough intensity of mold pin 21,24 and 25, the latter has the minimum diameter of 10mm.
Though the present invention only uses on the core pin 21,24 and 25 of moulding in an embodiment, the present invention also can also have on the knock pin of moulding function or the mold pin and use both having demoulding functions.
Claims (10)
1. a mould that the is used for working plastic material mold pin (21 of injection mould especially, 24,25), as the mould pin, the core pin, knock pin etc., comprise that at least one defines the mould spare (12 of die cavity (41), 17), as template or mold insert, this mold members has at least one and is used to hold rod mold pin (21,24,25) pilot hole, mold pin to small part is made by high conductivity material such as beryllium copper etc., it is characterized in that, mold pin (21,24,25) has a steel shell district (44,50,51), it is provided with axial hole (28 at least on an axial subregion, 29,30), the one pin core of being made by high conductivity material (31 is set in described axial hole, 32,33), wherein, shell region (44,50,51) and pin core (31,32,33) material is rabbeted interlacedly, at pin core (31,32,33) shell surface (34) and pin shell (44,50,51) form lasting and seamless connectivity between the internal valve (37).
2. by the described mold pin of claim 1, it is characterized in that pin core (31,32,33) is made of copper or copper alloy.
3. by claim 1 or 2 described mold pins, it is characterized in that the shell surface (34) of pin core (31,32,33) interconnects with internal valve (37) material under the situation that a kind of metal of formation is connected of pin shell (44,50,51) sealedly.
4. by one of aforementioned claim described mold pin, it is characterized in that axial hole (28,29,30) is gone up at the end regions (36,45,46) adjacent with die cavity (41) at least and sealed by means of a steel plate.
5. by one of claim 1-3 described mold pin, it is characterized in that axial hole (28,29,30) is gone up at the end regions (36,45,46) adjacent with die cavity (41) at least and sealed by means of a coating (35a, 35b, 35c).
6. by one of aforementioned claim described mold pin, it is characterized in that, cooling duct (42a, 42b, 42c, 42d) is set adjacent to mold pin (21,24,25).
7. by one of aforementioned claim described mold pin, it is characterized in that axial hole (28,29,30) extends on the whole axial region of mold pin (21,24,25).
8. by one of aforementioned claim described mold pin, it is characterized in that pin core (31,32,33) extends on the whole axial region of mold pin (21,24,25).
9. by one of claim 1-7 described mold pin, it is characterized in that pin core (31,32,33) extends on an axial subregion of mold pin (21,24,25).
10. by one of aforementioned claim described mold pin, it is characterized in that mold pin (21,24,25) has the minimum diameter of a 10mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004057945.8 | 2004-11-30 | ||
| DE102004057945 | 2004-11-30 | ||
| DE102005055807.0 | 2005-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1827344A true CN1827344A (en) | 2006-09-06 |
Family
ID=36945990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510048300 Pending CN1827344A (en) | 2004-11-30 | 2005-11-30 | Mold pin for mold of working plastic material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1827344A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104339502A (en) * | 2014-10-28 | 2015-02-11 | 苏州广型模具有限公司 | Durable mold thimble |
-
2005
- 2005-11-30 CN CN 200510048300 patent/CN1827344A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104339502A (en) * | 2014-10-28 | 2015-02-11 | 苏州广型模具有限公司 | Durable mold thimble |
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Correction item: Priority Correct: 2005.11.21 DE 102005055807.0 False: Lack of priority second Number: 36 Page: The title page Volume: 22 |
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