CN103587005B - A kind of mould labyrinth conformal cooling method and structure thereof - Google Patents
A kind of mould labyrinth conformal cooling method and structure thereof Download PDFInfo
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- CN103587005B CN103587005B CN201310559377.6A CN201310559377A CN103587005B CN 103587005 B CN103587005 B CN 103587005B CN 201310559377 A CN201310559377 A CN 201310559377A CN 103587005 B CN103587005 B CN 103587005B
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Abstract
A kind of mould labyrinth conformal cooling method and structure thereof, solve the difficult problem that existing mold cooling means cannot meet the cooling of complicated die efficient uniform, compare that straight hole runner, built-in bend pipe runner and conventional tubular conformal runner three kinds of traditional moulds cooling means cooling effectiveness are high, good cooling results.Structure of the present invention, for having one and the subparallel voided layer of die cavity inner surface at mould inside distance die cavity certain thickness place, is provided with mazy partition wall in layer, flow in the passage that the partition wall gap of cooling medium in cooling layer is formed.Advantage of the present invention is cooling medium state of cooling in labyrinth type partition wall gap is turbulent flow, and adds the contact area of cooling medium and mould, and cooling effectiveness is high, and die life is long, shortens the Shooting Technique cycle, reduces injection moulding production cost.Adopt the mould of laser 3D printing technique direct fabricated ribbon stratiform labyrinth flow-path conformal cooling structure, mould inside uniform composition, moulding process is simple, and die manufacturing cycle is short, the low cost of manufacture of mould.
Description
Technical field
The invention belongs to technology of die manufacturing, be specifically related to a kind of mould labyrinth conformal cooling method and structure thereof.
Background technology
Tool and Die Technology is one of most widely used technology in current manufacturing industry, and the cooling system of mould all has material impact to the life-span of mould, the production efficiency of product and quality.Especially for the large mold of complexity, cooling system is even more important.At present, the cooling means of mould mainly contains three kinds: straight hole runner cooling means, built-in bend pipe runner cooling means and tubulose conformal runner cooling means.
Straight hole runner cooling means is most widely used general in current Tool and Die Technology, by conventional machine processing method, as carried out car, milling, plane, brill, mill, galvanic corrosion etc. to metal blank, thus obtains the mould with straight hole coolant flow channel.Straight hole coolant flow channel is generally made up of one group of straight perforate system.For forming closed runner, except the import of cooling medium is with except outlet, other perforate needs to seal with plug.There is following problem in this cooling means: first, and straight hole runner cannot evenly press close to die cavity and whose surfaces, causes cooling effect uneven, simultaneously in complicated die, there is the thermal center that straight hole runner cannot be close, and be unfavorable for scattering and disappearing of heat, cooling effectiveness is low.Therefore, there is the problem that cooling effect is uneven and cooling effectiveness is low in straight hole runner cooling means, can reduce the quality of product, increase forming period simultaneously, improves the cost that part manufactures.Secondly, the processed complex of straight hole coolant flow channel, many holes needs to block with plug.Finally, the design of straight hole coolant flow channel mainly relies on experience, and when the mould become increasingly complex in the face of structure, the design of this cooling means lacks theoretical direction, is difficult to meet cooling requirement.
The built-in bend pipe runner type of cooling to some extent solves the problem of cooling pipe shape restriction, its technical scheme is specially: mould is made up of the fine and close filling block of mould outline housing and casting, in fine and close filling block, be provided with the mould conformal cooling pipe that process in advance, corresponding with the shape conformal of mold cavity axis is space three-dimensional curve, fine and close filling block casts in mould outline housing.Built-in bend pipe runner takes the material bending such as copper, nickel to be shaped, relative to straight hole runner cooling means, its flow channel shape complexity increases, cooling effectiveness and quality can be improved, fine and close filling block adopts casting process processing cost low, and the manufacturing cost of mould and manufacturing cycle are all lower than conventional machine processing and manufacturing mould.But its conformal cooling pipe is independent bending forming, is difficult to reach and meets completely with complex cavity, and casting cycle can affect the dimensional accuracy of preform pipeline, the more traditional forging mold poor performance of mechanical property of casting filling block.
The realization of tubulose conformal cooling method relies on the development increasing material manufacturing technology (3D printing technique).It is a kind of according to three-dimensional data model for increasing material manufacturing technology, based on successively manufacturing, dispersed material is connected into the technique of entity.3D solid is become some two dimensional surfaces by this technique, greatly reduces the complexity of manufacture, can go out have the mould of complicated follow-cooling passageway by Quick-forming.Tubulose follow-cooling passageway can completely free design and manufaction, forms hot envelope district, improve the efficiency of cooling and the uniformity of temperature at die surface.But tubulose conformal cooling method is in the long-pending timing of flow channel cross-section, and girth is less, little with contacting dies area, limits its cooling effectiveness.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of mould labyrinth conformal cooling method and structure thereof, the present invention has that cooling effectiveness is high, the uniform feature of mold temperature distribution, is particularly suitable for the cooling of complex-shaped mould.
A kind of mould labyrinth provided by the invention conformal cooling method, it is characterized in that, the method is or/and the position of whose surfaces arranges voided layer at the inner close die cavity of mold, and make voided layer closely parallel with described surface, the labyrinth path for filling cooling medium is provided with in voided layer, to increase the contact area of cooling medium and mould, and make the flow regime of cooling medium in the partition wall gap of labyrinth path for turbulent flow, to strengthen the convection current of cooling medium inside.
Die cooling structure provided by the invention, is characterized in that, the inner close die cavity of mold is or/and the position of whose surfaces is provided with voided layer, and this voided layer is closely parallel with described surface, is provided with the labyrinth path for filling cooling medium in it.
Compared with prior art, the present invention has following technique effect: in the mould of band labyrinth conformal cooling layer, runner is laminar flow road, but not conventional flow field, greatly increase the contact area of cooling medium and mould, cooling medium flow regime in labyrinth type partition wall gap is turbulent flow simultaneously, adds the convection current of cooling medium inside, has increased substantially cooling effectiveness.There is multiple extra access port and outlet in the flow path of one cooling medium, multiply flow of cooling water path is in parallel, and mold integral cooling effect evenly, rapidly, reduce mould inside residual stress, extend die life, shorten the Shooting Technique cycle, reduce injection moulding production cost.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of mould example provided by the invention;
Fig. 2 is the schematic cross-section of mould example provided by the invention;
Fig. 3 is that the one of labyrinth conformal cooling layer launches schematic diagram;
Fig. 4 is that the second of labyrinth conformal cooling layer launches schematic diagram;
Fig. 5 is the third expansion schematic diagram of labyrinth conformal cooling layer.
Detailed description of the invention
Method provided by the invention is by arranging cooling layer in the position of die surface certain distance, labyrinth flow-path is dispersed with in this cooling layer, stratiform cooling adds the contact area of cooling medium and mould, in labyrinth flow-path, cooling medium can produce strong turbulent condition simultaneously, and cooling effectiveness comparatively tubulose conformal cooling method increases further.
The mould of band labyrinth provided by the invention conformal cooling layer has one and the subparallel voided layer of die cavity inner surface.The position of labyrinth cooling layer is arranged according to the heat dissipation capacity change at product position: at product wall thickness heat energy-saving position greatly, cooling layer is near die cavity, at the position that heat dissipation capacity is little, cooling layer is suitably away from die cavity, realize continuous transition at the position changed to thin-walled by heavy wall, make the heat radiation of this position mold cavity surface even.
Distance between this voided layer and die cavity is D; The thickness d of voided layer selects according to the size of product and thickness, and d generally gets 4-8mm, product larger and thick time d get higher value, product size is little and the thin d of being gets smaller value, and the distance D of voided layer and mold cavity surface is 4d ~ 6d, is generally taken as 5d.Be provided with labyrinth path in voided layer, cooling medium flows in runner.
Mould provided by the invention, cooling layer and die cavity/whose surfaces closely be arranged in parallel, and the labyrinth path arranged in cooling layer can the series connection runner of single gateway, the runner in parallel of multiple port, or any combination of series connection runner and runner in parallel.
The cross section of single runner can be circular, also can be that other arbitrary shape is (as with shapes such as profile of tooth, trapezoidal, rectangles, or using these shapes as basic configuration, fillet or the derivative shape that changes various parameter values and generate in addition), all can adopt the manufacture of 3D printing technique.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.It should be noted that at this, the explanation for these embodiments understands the present invention for helping, but does not form limitation of the invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, 2, the example of mould provided by the invention comprises mold 2 and labyrinth cooling layer 3, labyrinth cooling layer 3 is nearly parastate with the die cavity 1 of mould, namely press parastate design cooling layer shape, and according to the concrete structure of mould, the distance D between labyrinth cooling layer and mold cavity surface is finely tuned.
Fig. 2 is the schematic cross-section of example 1, and the setting of labyrinth cooling layer 3 should consider the heat dissipation capacity change at product position: at product wall thickness heat energy-saving position greatly, cooling layer 3 should near die cavity 1, and the distance D namely between labyrinth cooling layer and mold cavity surface reduces 1 ~ 4mm; At the position that the heat dissipation capacities such as thin-walled are little, cooling layer 3 should suitably away from die cavity 2, and the distance D namely between labyrinth cooling layer and mold cavity surface increases 1 ~ 4mm.Stratiform conformal cooling method can realize continuous transition at the position changed to thin-walled by heavy wall, makes the heat radiation of this position mold cavity surface even.
Traditional straight hole runner cooling means, built-in bend pipe runner cooling means and tubulose conformal cooling method, structurally all based on tubulose runner, the cross section of tubulose runner also exist with conduit axis the thermograde of the concentric circles being the center of circle.If pipe arrangement is sparse, then the thermograde on mold cavity surface is uneven, and cooling effect is not good; If pipe arrangement is too intensive, then greatly can increase the manufacture difficulty of mould, reduce mould production efficiency, increase die cost.The runner of mould provided by the invention is stratiform follow-cooling passageway, and thermograde is uniformly distributed in the plane being closely parallel to cooling layer, enhances cooling effect.
When product has sunk structure, when namely mold cavity has an outstanding structure, be heated around highlight more concentrated, need emphasis to cool, avoid cooling rear distortion.Adopt the offering question facing cooling pipe during straight hole tubulose cooling means equally, be difficult to arrange straight hole cooling water channel in the outstanding local of mold cavity, sometimes can only be arranged to the cooling duct of fountain type, be difficult to ensure cooling effectiveness; When adopting built-in bend pipe runner cooling means, the elbow curvature degree that local given prominence to by mould is comparatively large, and manufacture difficulty is large, and owing to not supporting easily distortion when casting moulds is concrete.The stratiform follow-cooling passageway of mould provided by the invention can be fitted the outstanding position of mould, ensures the cooling effect at emphasis cooling position.
Labyrinth cooling layer 3 is launched, is the labyrinth shape structure shown in Fig. 3, comprises labyrinth type partition wall 4 and runner 5.Adopt 3D printing technique directly labyrinth type partition wall 4 region can be fabricated to entity, vacant region forms runner 5 automatically.
Fig. 3 is simple labyrinth cooling layer schematic diagram, only has an entrance and an outlet, and in the cooling layer of labyrinth, cooling medium is only along a flow path.In this schematic diagram, the flow distance of cooling medium is long, if product is oversize, the flow path of cooling medium may be caused long, the coolant temperature difference of entrance and exit is excessive, cooling effect is uneven, so this simple labyrinth cooling layer is suitable for, product size is little, the mould of simple shape.
The basis of the labyrinth cooling layer shown in Fig. 3 is improved and obtains the second labyrinth cooling layer, as shown in Figure 4, adopt the pattern of multiple coolant flow channel parallel connection.Have multiple coolant flow channel in this schematic diagram, each cooling water channel length is shorter, and cooling medium can play cooling effect rapidly, improve cooling effectiveness, paralleling model makes mould, and cooling effect is even everywhere, is suitable for the mould needing cooling rapidly, or the mould that product is easily out of shape because inhomogeneous cooling is even.
Can adopt the third labyrinth cooling layer as shown in Figure 5 for larger-size complicated die, this cooling structure has multiple cooling medium entrance and exit, and the inner multiple series connection runner of cooling layer and runner in parallel combine.This labyrinth cooling layer is applicable to larger-size mould, or the mould that internal structure is more complicated, and cooling effectiveness is high, and part performance is good, and die life is long.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the content disclosed in this embodiment and accompanying drawing.The equivalence completed under not departing from spirit disclosed in this invention so every or amendment, all fall into the scope of protection of the invention.
Claims (4)
1. a mould labyrinth conformal cooling method, it is characterized in that, the method is or/and the position of whose surfaces arranges voided layer at the inner close die cavity of mold, and make voided layer closely parallel with described surface, the labyrinth path for filling cooling medium is provided with in voided layer, to increase the contact area of cooling medium and mould, and make the flow regime of cooling medium in the partition wall gap of labyrinth path for turbulent flow, to strengthen the convection current of cooling medium inside; Distance between described voided layer and die cavity is 4 ~ 6 times of voided layer thickness, and described labyrinth path is the runner in parallel of multiple port, or is any combination of series connection runner and runner in parallel;
Described labyrinth path is manufactured by 3D printing technique, produces labyrinth type partition wall in voided layer, and vacant region forms described labyrinth path automatically.
2. a die cooling structure, it is characterized in that, the inner close die cavity of mold is or/and the position of whose surfaces is provided with voided layer, this voided layer is closely parallel with described surface, the labyrinth path for filling cooling medium is provided with in it, this labyrinth path adopts 3D printing technique to produce labyrinth type partition wall in described voided layer, and vacant region is formed automatically; Distance between described voided layer and die cavity is 4 ~ 6 times of voided layer thickness;
Described labyrinth path is the runner in parallel of multiple port, or is any combination of series connection runner and runner in parallel.
3. die cooling structure according to claim 2, is characterized in that, the cross section forming the single runner of labyrinth path is arbitrary shape.
4. the die cooling structure according to Claims 2 or 3, it is characterized in that, the position of labyrinth cooling layer is arranged according to the heat dissipation capacity change at product position: at product wall thickness heat energy-saving position greatly, cooling layer is near die cavity, at the position that heat dissipation capacity is little, cooling layer, suitably away from die cavity, realizes continuous transition at the position changed to thin-walled by heavy wall, makes the heat radiation of this position mold cavity surface even.
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| CN201310559377.6A CN103587005B (en) | 2013-11-12 | 2013-11-12 | A kind of mould labyrinth conformal cooling method and structure thereof |
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| CN101670627A (en) * | 2009-07-20 | 2010-03-17 | 黑龙江科技学院 | Mould structure with conformal cooling pipe |
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