CN117816939A - Core pulling structure and core pulling method of extrusion core - Google Patents
Core pulling structure and core pulling method of extrusion core Download PDFInfo
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- CN117816939A CN117816939A CN202311709458.XA CN202311709458A CN117816939A CN 117816939 A CN117816939 A CN 117816939A CN 202311709458 A CN202311709458 A CN 202311709458A CN 117816939 A CN117816939 A CN 117816939A
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- 238000001125 extrusion Methods 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000498 cooling water Substances 0.000 claims abstract description 58
- 239000012778 molding material Substances 0.000 claims abstract description 49
- 239000000110 cooling liquid Substances 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 26
- 238000009413 insulation Methods 0.000 claims description 5
- 239000002937 thermal insulation foam Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 description 11
- 230000006378 damage Effects 0.000 description 10
- 239000002826 coolant Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- -1 at this moment Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a core pulling structure and a core pulling method of an extrusion core, which belong to the field of mould application and comprise a pressing plate, wherein a fixed core is arranged at the lower side of the pressing plate, the rod body of an extrusion cylinder is connected with the extrusion core, the extrusion core penetrates through the inside of the fixed core, a cooling water channel is arranged in the extrusion core, the core pulling structure further comprises a controller for controlling the extrusion core to extend and retract, and cooling liquid with fixed temperature can be introduced into the extrusion core through the arrangement of the cooling water channel in the extrusion core, so that the cooling speed of a molding material at the extrusion core is controlled, the extrusion core can retract in advance when the molding material is just solidified, and the problems that in the prior art, the product structure is damaged in the core pulling process of the extrusion core, and the roughness is poor are solved.
Description
Technical Field
The invention relates to the field of die application, in particular to a core pulling structure and a core pulling method of an extrusion core.
Background
In the casting process of a relatively complex workpiece, in order to facilitate mold opening, a plurality of cores are usually arranged on a mold, during mold opening, core pulling action is performed first, and then the mold is opened, so that the workpiece and the mold are prevented from interfering during mold opening, and the core pulling action is completed.
In the process of introducing molding materials into the mold, a special core, namely an extrusion core, is generally adopted to improve the strength of part of the structure (such as a deep hole), and the extrusion core is different from a common core in that the common core is directly arranged on the mold, and the molding materials are filled around the common core when the molding materials are introduced. The extrusion core is in a contracted state when being arranged on the die, after the molding material is introduced, the contracted part stretches out again to extrude the filled molding material, the local compactness of the extruded molding material can be improved, and the local strength of the molded product is further improved.
However, in the actual production process, there are some problems with the core pulling of the extrusion core: due to the high compactness of the surrounding materials of the extrusion core, a certain degree of adhesion can be generated between the surrounding materials and the extrusion core in the cooling process, so that the structure roughness of the extrusion core is poor after the core is pulled, and the condition that the product structure is damaged in the core pulling process can possibly occur.
For example, "a core pulling and pressing mechanism of a die casting die", disclosed in chinese patent literature, has an issue number CN104550831B, and includes a pressing hydraulic cylinder fixed to one end of a slider, the pressing hydraulic cylinder being connected with a pressing piston rod; the extrusion core connecting rod penetrates through the sliding block, and one end of the extrusion core connecting rod is connected with the extrusion piston rod; an extrusion core, one end of which is connected to the other end of the extrusion core connecting rod; the extrusion core sleeve is sleeved outside the extrusion core, and the extrusion core sleeve is fixed at the other end of the sliding block. However, the disadvantage of this patent is that the degree of compaction of the material around the extruded core is high during the core pulling process, resulting in poor structural roughness at the extruded core after the core is pulled, and there is a possibility that the core pulling process damages the structure of the product.
Disclosure of Invention
The invention provides a core pulling structure and a core pulling method of an extrusion core, which aims to solve the problems that in the prior art, the core pulling process possibly damages the structure of a product and the roughness after core pulling is poor when the core is pulled by the extrusion core, and can avoid the condition that the structure of the product is damaged in the core pulling process under the condition that the material at the extrusion core is compact, and simultaneously ensure that the roughness of the product after core pulling is better.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention discloses a core pulling structure of an extrusion core, which comprises a pressing plate, wherein a fixed core is arranged on the lower side of the pressing plate, the rod body of an extrusion cylinder is connected with the extrusion core, the extrusion core penetrates through the inside of the fixed core, a cooling water channel is arranged in the extrusion core, and the core pulling structure further comprises a controller for controlling the extrusion core to extend and retract.
In this application, through set up the cooling water passageway in the extrusion core, can be to letting in fixed temperature's coolant liquid in the extrusion core, thereby control the cooling rate of the molding material of extrusion core department, and then make the molding material of extrusion core department begin to solidify in a relatively fixed time after the cooling begins, the cooperation timer, make the extrusion core can just solidify the time retracting in advance when accomplishing at molding material, at this moment, molding material has been finalized, simultaneously, because be in higher temperature, the material rigidity is still relatively poor, consequently the withdrawal of extrusion core can not lead to the destruction of product structure.
Preferably, the cooling water channel comprises a heat exchange part at the lower end of the cooling water channel, and the heat exchange part carries out partial cooling on the product from bottom to top in sequence in the process of retracting the extrusion core. Through this scheme for the outside molding material of extrusion core can carry out step by step cooling, if the outside structure of extrusion core is whole to solidify and withdraws from the extrusion core after accomplishing, can receive great resistance when then the extrusion core withdraws from, easily cause the destruction to the fashioned structure of molding material, and in this application, extrusion core outside, the one section of molding material's below solidifies earlier, solidifies back extrusion core and upwards moves a section distance, at this moment, the extrusion core only receives the resistance of solidifying partial molding material, is difficult to cause the destruction to molding material, simultaneously, because only withdrawn a section distance, the material of the unset part of upside can not flow into the extrusion core and withdraw from in the cavity that forms.
Preferably, the cooling water channel further comprises a heat-insulated part, and a heat-insulating cavity is arranged between the heat-insulated part and the outer wall of the extrusion core. The heat insulation cavity enables the solidification speed of the molding material to be relatively low at the part of the extrusion core outside the heat exchange part, so that the resistance to the extrusion core is low in the step-by-step withdrawal process.
Preferably, the heat insulation cavity is filled with heat insulation foam bars.
Preferably, the cooling water channel further comprises a cooling water inlet section and a cooling water return section, and the heat exchange part and the heat-insulated part are both positioned between the cooling water inlet section and the cooling water return section.
Preferably, the cooling water backflow section is coated outside the cooling water inlet section, and a backflow channel is formed between the inner side of the cooling water backflow section and the outer side of the cooling water inlet section. Through this structure for when the extrusion core is in the state of stretching out, be indirect heat transfer between the shaping material of coolant liquid access section and the outside of fixed core, and then make the coolant liquid that gets into in the heat exchange portion receive the influence of the outside shaping material of fixed core's high temperature less, can also keep lower temperature when reaching the heat exchange portion, and when the extrusion core is in the state of retracting, heat exchange has not been carried out in heat exchange portion department, and the coolant liquid in the cooling water backward flow section can also keep lower problem, so also can have fine cooling effect to the outside shaping material of fixed core, thereby improve the holistic cooling efficiency of product.
Preferably, the pressing plate is connected with a mounting seat, and a driving device connected with the extrusion core is mounted on the mounting seat.
Preferably, the driving device comprises a push rod, a T-shaped groove is formed in the push rod, and a T-shaped mounting head matched with the T-shaped groove is arranged at the upper end of the extrusion core.
Therefore, the invention has the following beneficial effects: (1) Under the condition that materials at the extrusion core are compact, the condition that the product structure is damaged in the core pulling process is avoided, and meanwhile, the roughness of the product after core pulling is better; (2) In the extrusion core withdrawing process, the extrusion core can be cooled step by step, and the possibility of structural damage is reduced by reducing the contact area between the solidified material and the extrusion core; (3) The molding material outside the fixed core can be cooled, and the overall cooling efficiency of the product is improved.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present invention when applied in a mold.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a stationary core and an extrusion core in accordance with a second embodiment of the present invention.
In the figure: the core pulling structure 2 of the die 1 is characterized in that the pressing plate 3 is used for fixing the core 4, extruding the cooling water channel 6 of the core 5, the installation seat 7 of the driving device 8, the push rod 9, the T type groove 10 and T type installation head 11, the cooling water inlet section 12, the heat exchange section 13 and the cooling water return section 15 of the heat insulation part 14 are used for heat insulation of the foam rod 16.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
1-2, a core pulling structure 2 of an extrusion core 5 is installed in a mold 1 for casting, and comprises a pressing plate 3, wherein a fixed core 4 is installed at the lower side of the pressing plate 3, an extrusion core 5 is connected to a rod body of an extrusion cylinder, a bushing is installed at the inner side of the fixed core 4, the extrusion core 5 penetrates through the inside of the fixed core 4, and the fixed core 4 and the extrusion core 5 can axially and relatively slide. The extrusion core 5 is internally provided with a cooling water channel 6, and the core pulling structure 2 further comprises a controller for controlling the extrusion core 5 to extend and retract. The pressing plate 3 is connected with a mounting seat 7, and a driving device 8 connected with the extrusion core 5 is mounted on the mounting seat 7. The driving device 8 is a servo electric cylinder and comprises a push rod 9, a T-shaped groove 10 is formed in the push rod 9, and a T-shaped mounting head 11 matched with the T-shaped groove 10 is arranged at the upper end of the extrusion core 5.
Through set up cooling water passageway 6 in extrusion core 5, can let in fixed temperature's coolant liquid in extrusion core 5 to control the cooling rate of the shaping material of extrusion core 5 department, and then make the shaping material of extrusion core 5 department begin to solidify in a relatively fixed time after the cooling begins, the cooperation timer makes extrusion core 5 can retract in advance when shaping material just solidifies is accomplished, at this moment, shaping material has been finalized the design, simultaneously, because be in higher temperature, rigidity is still relatively poor, consequently the withdrawal of extrusion core 5 can not lead to the destruction of product structure. By the servo cylinder, the movement of the squeeze core 5 can be made more flexible, thereby realizing a process of withdrawing the squeeze core 5 in time-series steps.
A core pulling method of an extrusion core 5, comprising the steps of:
(1) keeping the extrusion core 5 in a contracted state relative to the fixed core 4, combining all the cores with the die 1, closing the dies, and then introducing molding materials into the die 1;
(2) after the molding material is introduced, the extrusion core 5 is controlled to extend relative to the fixed core 4 by the driving device 8, so that the material around the extrusion core 5 is compacted;
(3) introducing cooling liquid into the cooling water channel 6, and performing heat exchange between the cooling liquid and the molding material to enable the molding material to be solidified locally in advance;
(4) after a certain time of cooling liquid is introduced, the extrusion core 5 is controlled to retract by the controller;
(5) after the extrusion core 5 is completely retracted, continuously introducing cooling liquid to further cool the external material of the fixed core 4;
(6) after the product is completely cooled, the pressing plate 3, the fixed core 4 and the extrusion core 5 are withdrawn from the die 1, and then the die is opened.
The setting time of the surrounding molding material is also different due to the different shapes of the extrusion core 5, and the time for controlling the withdrawal of the extrusion core 5 is determined according to an experiment, wherein the experiment method is that the time required for the surrounding molding material to reach the setting temperature after the cooling water is introduced is measured, and the time is added with a surplus value of 20-60 seconds as the interval time between the two actions of introducing the cooling liquid and controlling the withdrawal of the extrusion core 5.
In the second embodiment, as shown in fig. 3-4, a core pulling structure 2 of an extrusion core 5 is installed in a mold 1 for casting, and comprises a pressing plate 3, a fixed core 4 is installed at the lower side of the pressing plate 3, an extrusion core 5 is connected to a rod body of an extrusion cylinder, a bushing is installed at the inner side of the fixed core 4, the extrusion core 5 penetrates through the inside of the fixed core 4, and the fixed core 4 and the extrusion core 5 can axially slide relatively. The extrusion core 5 is internally provided with a cooling water channel 6, and the core pulling structure 2 further comprises a controller for controlling the extrusion core 5 to extend and retract. The pressing plate 3 is connected with a mounting seat 7, and a driving device 8 connected with the extrusion core 5 is mounted on the mounting seat 7. The driving device 8 is a servo electric cylinder and comprises a push rod 9, a T-shaped groove 10 is formed in the push rod 9, and a T-shaped mounting head 11 matched with the T-shaped groove 10 is arranged at the upper end of the extrusion core 5.
Through set up cooling water passageway 6 in extrusion core 5, can let in fixed temperature's coolant liquid in extrusion core 5 to control the cooling rate of the shaping material of extrusion core 5 department, and then make the shaping material of extrusion core 5 department begin to solidify in a relatively fixed time after the cooling begins, the cooperation timer makes extrusion core 5 can retract in advance when shaping material just solidifies is accomplished, at this moment, shaping material has been finalized the design, simultaneously, because be in higher temperature, rigidity is still relatively poor, consequently the withdrawal of extrusion core 5 can not lead to the destruction of product structure. By the servo cylinder, the movement of the squeeze core 5 can be made more flexible, thereby realizing a process of withdrawing the squeeze core 5 in time-series steps.
The cooling water channel 6 comprises a heat exchange part 13 positioned at the lower end of the cooling water channel, and the heat exchange part 13 carries out partial cooling on products in sequence from bottom to top in the process of retracting the extrusion core 5; the cooling water channel 6 further comprises a heat-insulated part 14, and a heat-insulating cavity is arranged between the heat-insulated part 14 and the outer wall of the extrusion core 5; the insulating cavity is filled with insulating foam rods 16. The cooling water channel 6 further comprises a cooling water inlet section 12 and a cooling water reflux section 15, and the heat exchange part 13 and the heat-insulated part 14 are positioned between the cooling water inlet section 12 and the cooling water reflux section 15; the cooling water backflow section 15 is coated outside the cooling water inlet section 12, and a backflow channel is formed between the inner side of the cooling water backflow section 15 and the outer side of the cooling water inlet section 12. In the cooling water channel 6, each part is arranged in sequence according to the flowing sequence of the cooling liquid: the cooling water is introduced into the cooling water inlet section 12, the heat exchange section 13, the heat-insulated section 14, and the cooling water return section 15.
Through this scheme for the outside molding material of extrusion core 5 can carry out step by step cooling, if the outside structure of extrusion core 5 is whole to solidify and is withdrawn extrusion core 5 after accomplishing, then can receive great resistance when extrusion core 5 withdraws from, easily lead to the fact the destruction to molding material fashioned structure, and in this application, extrusion core 5 is outside, the one section of molding material's below solidifies earlier, the one section distance of upwards removal of extrusion core 5 after solidifying, at this moment, extrusion core 5 only receives the resistance of solidifying partial molding material, be difficult to cause the destruction to molding material, simultaneously, because only withdrawn one section distance, the material of the unset part of upside can not flow into extrusion core 5 and withdraw from in the cavity that forms. The heat-insulating chamber makes the solidification speed of the molding material relatively slow at the extrusion core 5 at the portion other than the heat exchanging portion 13, thereby ensuring less resistance during the stepwise withdrawal of the extrusion core 5. When the extrusion core 5 is in an extended state, indirect heat exchange is performed between the cooling liquid inlet section and the molding material outside the fixed core 4, so that the cooling liquid entering the heat exchange part 13 is less influenced by the high temperature of the molding material outside the fixed core 4, the temperature can be kept low when reaching the heat exchange part 13, and when the extrusion core 5 is in a retracted state, the heat exchange is not performed at the heat exchange part 13, the cooling liquid in the cooling water backflow section 15 can be kept low, and the molding material outside the fixed core 4 can be cooled well, so that the overall cooling efficiency of the product is improved.
A method of cooling an extrusion core 5 comprising the steps of:
(1) keeping the extrusion core 5 in a contracted state relative to the fixed core 4, combining all the cores with the die 1, closing the dies, and then introducing molding materials into the die 1;
(2) after the molding material is introduced, the extrusion core 5 is controlled to extend relative to the fixed core 4 by the driving device 8, so that the material around the extrusion core 5 is compacted;
(3) introducing cooling liquid into the cooling water channel 6, and performing heat exchange between the cooling liquid and the molding material to enable the molding material to be solidified locally in advance;
(4) after a certain time of cooling liquid is introduced, the extrusion core 5 is controlled to retract by the controller;
(5) after the extrusion core 5 is completely retracted, continuously introducing cooling liquid to further cool the external material of the fixed core 4;
(6) after the product is completely cooled, the pressing plate 3, the fixed core 4 and the extrusion core 5 are withdrawn from the die 1, and then the die is opened.
Wherein, in the step (3), the cooling liquid is heat-exchanged only with the molding material at the heat exchanging portion 13, but hardly heat-exchanged with the molding material at the heat-insulated portion 14, thereby causing the partial solidification of the molding material at the heat exchanging portion 13 in advance.
In the step (4), the extrusion core 5 is retracted intermittently, the single retraction distance of the extrusion core 5 is equal to the thickness of the heat exchange part 13, after the single retraction of the extrusion core 5, the cooling liquid in the heat exchange part 13 exchanges heat with the non-solidified molding material again, the original solidified molding material is shaped and prevented from entering the cavity, the solidification time of the surrounding molding material is different due to the different shapes of the extrusion core 5, and the interval time for controlling each retraction of the extrusion core 5 is determined according to experiments.
In step (5), the continuously introduced cooling liquid does not exchange heat at the heat exchange portion 13, and directly exchanges heat with the molding material outside the fixed core 4 in the cooling water backflow section 15, thereby improving the cooling efficiency of the entire mold 1.
Claims (10)
1. The utility model provides a structure of loosing core of extrusion core, its characterized in that includes the clamp plate, fixed core is installed to the downside of clamp plate, be connected with the extrusion core on the body of rod of extrusion jar, the extrusion core passes inside fixed core, be equipped with the cooling water passageway in the extrusion core, the structure of loosing core still includes the controller that control extrusion core stretches out and retracts.
2. The core pulling structure of an extrusion core according to claim 1, wherein the cooling water channel comprises a heat exchange part at the lower end thereof, and the heat exchange part performs partial cooling on the product from bottom to top in sequence during retraction of the extrusion core.
3. The core pulling structure of an extrusion core according to claim 2, wherein the cooling water channel further comprises a heat-insulated part, and a heat-insulating cavity is arranged between the heat-insulated part and the outer wall of the extrusion core.
4. A core pulling structure of an extrusion core according to claim 3, wherein the heat insulation cavity is filled with heat insulation foam bars.
5. A core pulling structure of an extrusion core according to claim 3, wherein the cooling water passage further comprises a cooling water inlet section and a cooling water return section, and the heat exchanging portion and the heat-insulated portion are both located between the cooling water inlet section and the cooling water return section.
6. The core pulling structure of an extrusion core as set forth in claim 5, wherein said cooling water return section is covered outside the cooling water inlet section, and a return passage is formed between the inside of the cooling water return section and the outside of the cooling water inlet section.
7. The core pulling structure of an extrusion core according to any one of claims 1 to 6, wherein a mounting base is connected to the pressing plate, and a driving device connected to the extrusion core is mounted on the mounting base.
8. The core pulling structure of claim 7, wherein the driving device comprises a push rod, a T-shaped groove is formed in the push rod, and a T-shaped mounting head matched with the T-shaped groove is arranged at the upper end of the extrusion core.
9. A core pulling method of an extrusion core, which is completed by using the core pulling structure as defined in claim 1, comprising the steps of:
(1) keeping the extrusion core in a contracted state relative to the fixed core, combining all the cores with the mold, closing the mold, and then introducing molding materials into the mold;
(2) after the molding material is introduced, the extrusion core is controlled to extend out relative to the fixed core by the driving device, so that the material around the extrusion core is compacted;
(3) introducing cooling liquid into the cooling water channel, and performing heat exchange between the cooling liquid and the molding material to enable the molding material to be solidified locally in advance;
(4) after cooling liquid is introduced for a certain time, the extrusion core is controlled to retract by the controller;
(5) after the extrusion core is completely retracted, continuously introducing cooling liquid to further cool the external material of the fixed core;
(6) and after the product is completely cooled, the pressing plate, the fixed mold core and the extrusion mold core are withdrawn from the mold, and then the mold is opened.
10. The method of core pulling for an extrusion core as defined in claim 9, wherein in the step (4), the extrusion core is intermittently withdrawn stepwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311709458.XA CN117816939A (en) | 2023-12-12 | 2023-12-12 | Core pulling structure and core pulling method of extrusion core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311709458.XA CN117816939A (en) | 2023-12-12 | 2023-12-12 | Core pulling structure and core pulling method of extrusion core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117816939A true CN117816939A (en) | 2024-04-05 |
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ID=90505211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311709458.XA Pending CN117816939A (en) | 2023-12-12 | 2023-12-12 | Core pulling structure and core pulling method of extrusion core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117816939A (en) |
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2023
- 2023-12-12 CN CN202311709458.XA patent/CN117816939A/en active Pending
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