Multi-layer ultrathin cooling fin sand core mold and casting device thereof

Abstract

The invention relates to the technical field of cooling fin casting, and discloses a multi-layer ultrathin cooling fin sand core mold and a casting device thereof, and the multi-layer ultrathin cooling fin sand core mold comprises a movable mold, a static mold, a blade core, a core pulling mechanism, a sand shooting mechanism, a driving mechanism, a heating mechanism, an ejector pin plate and a plurality of ejector pins. The mode that multiple layers of blades are fixedly stacked to form the blade core is adopted, the sand core is integrally formed in cooperation with the movable mold and the static mold, the precision of the sand core is improved, and the problem that the overall precision of the sand core cannot meet the precision requirement of an aero-engine due to stacking errors caused by stacking of multiple sand core pieces is solved. After the sand core is solidified, the blade core is firstly pulled away from the sand core through the core pulling mechanism, then the movable mold and the static mold are opened, the sand core is ejected out through the ejector pin, and the problem that the sand core cannot be completely separated from the mold is solved.

Description

Technical Field

[0001] The invention relates to the technical field of heat sink casting, and in particular to a multi-layer ultra-thin heat sink sand core mold and a casting device thereof. Background Art

[0002] In order to evenly dissipate heat from the cylinder head, air-cooled piston aircraft engines have several heat sinks of different shapes and numbers arranged on the outer surface of the cylinder head according to the heat load distribution of the cylinder. The heat sink fins are ultra-thin and have small gaps, so they cannot be formed using metal molds. Therefore, the heat sink area of ​​the casting needs to be formed using sand cores.

[0003] The sand core is the part of the casting mold that corresponds to the heat sink fins, and high casting accuracy is required. At present, for the manufacture of sand cores for aviation cylinder head heat sinks, the conventional method is to separately manufacture single-layer sand chips, and then stack multiple sand chips to form a sand core. However, due to the large number of blade layers, in addition to the normal casting error, there is also a stacking error caused by the stacking of multiple sand cores. The addition of the two errors cannot meet the accuracy requirements of high-precision heat sinks, and the production efficiency is low, the sand core is easy to break, and the product defect rate is high. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to propose a multi-layer ultra-thin heat sink sand core mold casting device and casting system, in which the sand core is integrally formed, thereby improving production efficiency, increasing the yield rate of heat sinks prepared by the sand core, saving production costs, and at the same time improving the accuracy of the sand core to meet the air-cooled heat dissipation performance requirements of the aircraft engine cylinder head.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A multi-layer ultra-thin heat sink sand core mold casting device, comprising a movable mold, a static mold, a blade core, a core pulling mechanism, a sand shooting mechanism, a driving mechanism, a heating mechanism, an ejector plate and a plurality of ejectors;

[0007] The movable mold and the static mold are arranged opposite to each other along the Y direction, and a closed cavity is formed when the movable mold and the static mold are closed. A sand inlet hole is provided at the connection between the movable mold and the static mold, and the sand inlet hole is communicated with the cavity. The static mold is provided with a core-pulling hole, and the movable mold and the static mold are respectively provided with a plurality of ejector holes penetrating along the Y direction;

[0008] One end of the ejector pin is inserted into the ejector pin hole, and the other end of the ejector pin is connected to the ejector pin plate;

[0009] The blade core is arranged in the mold cavity, the blade core comprises a plurality of blades and a combination mechanism, the blade is provided with a thin sheet portion, the plurality of thin sheet portions are located in the same side direction of the plurality of blades, the blade surfaces of the plurality of blades are arranged closely, and the combination mechanism is used to press the plurality of blades; the blade core is connected to the movable end of the core pulling mechanism;

[0010] The core pulling mechanism is disposed through the static mold, and the movable end of the core pulling mechanism can be reciprocated and disposed in the core pulling hole. The reciprocating movement of the movable end of the core pulling mechanism is used to drive the blade core to move downward to achieve separation or move upward for forming;

[0011] The sand shooting mechanism is provided with a sand shooting hole, the sand shooting hole is arranged opposite to the sand inlet hole, and the sand shooting mechanism is used to supply coated sand;

[0012] The driving mechanism is used to drive the movable mold to move closer to or away from the static mold along the Y direction;

[0013] The heating mechanism is used to heat the movable mold, the static mold and the blade core.

[0014] Preferably, the core pulling mechanism comprises a core pulling cylinder, a core pulling guide block, a core pulling block, a core pulling slider and a connecting block, the blade core is installed with the core pulling block, the core pulling block is provided with a limit shaft, the core pulling slider is provided with a slide groove matching the limit shaft, the limit shaft is passed through the slide groove, the limit shaft can reciprocate along the slide groove, the core pulling slider can be reciprocatingly slidably installed on the core pulling block, the slide groove is parallel to the blade surface of the blade, and the slide groove forms an angle a with the driving direction of the core pulling cylinder, and the core pulling guide block is fixed to the The static mold, the core pulling guide block is located at both ends of the core pulling slider and the core pulling block, the guiding direction of the core pulling guide block to the core pulling slider is parallel to the driving and retracting direction of the core pulling cylinder, the guiding direction of the core pulling guide block to the core pulling block is perpendicular to the driving and retracting direction of the core pulling cylinder, the core pulling guide block is used to limit the moving direction of the core pulling slider and the core pulling block, the connecting block connects the core pulling slider and the driving end of the core pulling cylinder, and the core pulling cylinder is used to drive the core pulling slider to move linearly along the driving direction of the core pulling cylinder.

[0015] Preferably, the angle a formed by the slide groove and the driving direction of the core-pulling cylinder is in the range of 10° to 30°, and the height of the slide groove in the vertical direction changes by 10 mm.

[0016] Preferably, the blade surface of the blade is provided with an exhaust groove, the exhaust grooves of adjacent blades are arranged opposite to each other, the exhaust groove is arranged through along the Y direction, and a shallowing portion is provided at one end of the exhaust groove connected to the thin sheet portion.

[0017] Preferably, the width of the exhaust groove is 10 mm, the spacing between adjacent exhaust grooves is 5 mm, the depth of the exhaust groove is 0.5 mm, and the depth of the shallower portion is 0.1 mm.

[0018] Preferably, the heating mechanism is a heating rod, and the movable mold, the static mold and the blade core are respectively provided with heating channels, and the heating channels are used to install the heating rod.

[0019] Preferably, it further comprises an upper mold foot and a lower mold foot, wherein the upper mold foot connects the movable mold and the driving mechanism, and the lower mold foot connects the static mold and an external fixing mechanism.

[0020] Preferably, the ejector plate comprises an upper ejector plate and a lower ejector plate, the upper ejector plate and the lower ejector plate are arranged opposite to each other along the Y direction, and the movable mold and the static mold are arranged between the upper ejector plate and the lower ejector plate.

[0021] Preferably, the blade has 33 layers, the thickness of the thin sheet portion is not greater than 1.5 mm, the spacing between the thin sheet portions is not greater than 1.8 mm, the depth of the thin sheet portion is not greater than 33 mm, and the draft angle of the thin sheet portion is 0.2°.

[0022] A sand core mold is cast by the multi-layer ultra-thin heat sink sand core mold casting device described in claims 1-9.

[0023] The technical solution provided by the present invention may include the following beneficial effects:

[0024] The method of fixedly stacking multiple layers of blades is adopted, and the sand core is formed in one piece by the dynamic mold and the static mold to improve the accuracy of the sand core and solve the problem that the stacking error caused by the stacking of multiple sand chips causes the overall accuracy of the sand core to fail to meet the accuracy requirements of aircraft engines.

[0025] The blade core is first pulled out of the sand core through the core pulling mechanism, and then the movable mold and the static mold are opened, and the ejector pin ejects the sand core, solving the problem that the sand core cannot be completely separated from the mold.

[0026] By setting an inclined chute and a fixed core-pulling guide block, when the core-pulling cylinder drives the core-pulling slider to move horizontally, the core-pulling slider drives the limiting shaft, the core-pulling block and the blade core to move vertically as a whole through the upper chute. Through the inclined chute, the vertical movement of the blade core is converted into the horizontal movement of the core-pulling slider. The driving direction of the core-pulling cylinder is set horizontally, which solves the problems of small movable distance of the blade core, limited core-pulling direction, and difficult installation of the core-pulling mechanism, and effectively reduces the volume of the casting device.

[0027] When the angle a is less than 10°, the horizontal movement distance of the core pulling slider is too long, which is not conducive to the installation of the core pulling mechanism. When the angle a is greater than 30°, the blade core is pulled out too fast, which can easily cause the sand core to break. Use a suitable angle to change the direction and slow down the driving movement of the core pulling cylinder, and pull the blade core downward 10 mm as a whole to ensure that the blade core is smoothly and steadily pulled out of the sand core, solving the problem of not being able to smoothly pull out the blade core.

[0028] During the process of filling coated sand, the gas between the thin blades can be discharged through the exhaust grooves between the blades to ensure good sand core molding. The exhaust grooves have a larger gap to facilitate rapid exhaust, and a shallower part with a smaller depth is set to reduce the gap between the exhaust groove and one end of the cavity to prevent the coated sand from leaking out of the exhaust grooves.

[0029] The size of the blade core sheet is the same as the fin part of the heat sink corresponding to the sand core. The maximum thickness of the heat sink fin is 1.5mm, the spacing is 1.8mm, the deepest is 33mm, the draft angle is 0.2°, and one heat sink has 33 layers of fins. When multi-layer sand chips are conventionally stacked, the manufacturing error of each layer of sand chips is about 0.1mm, and the overall cumulative error exceeds 3mm. By using sand core integrated molding, the overall error can be controlled within 0.3mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of a casting device according to an embodiment of the present invention.

[0031] Figure 2 The figure is a schematic diagram of the connection positions of the static mold, the core pulling mechanism and the blade core according to an embodiment of the present invention.

[0032] Figure 3 A top view of a static mold according to an embodiment of the present invention.

[0033] Figure 4 A bottom view of a movable mold according to an embodiment of the present invention.

[0034] Figure 5 The figure is a schematic diagram of the three-dimensional structure of a movable mold according to an embodiment of the present invention.

[0035] Figure 6 It is a schematic diagram of the three-dimensional structure of a sand core mold according to an embodiment of the present invention.

[0036] Figure 7 The figure is a schematic structural diagram of a blade according to an embodiment of the present invention.

[0037] Figure 8 It is a schematic diagram of the three-dimensional structure of a blade core according to an embodiment of the present invention.

[0038] Fig. 9It is a schematic diagram of the three-dimensional structure of the blade core in another direction of an embodiment of the present invention.

[0039] Fig.10 It is a cross-sectional view of a core pulling mechanism and a blade core according to an embodiment of the present invention.

[0040] Among them: movable mold 1, static mold 2, blade core 3, blade 31, thin sheet part 32, exhaust groove 33, shallow part 34, positioning hole 35, core pulling mechanism 4, core pulling cylinder 41, core pulling guide block 42, core pulling block 43, limit shaft 431, slide groove 44, core pulling slider 45, connecting block 46, sand shooting mechanism 5, ejector plate 6, several ejectors 7, sand core 8, cavity 100, sand feeding hole 101, core pulling hole 102, ejector hole 103, heating channel 104, angle a. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0043] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0046] A multi-layer ultra-thin heat sink sand core mold casting device, comprising a movable mold 1, a static mold 2, a blade core 3, a core pulling mechanism 4, a sand shooting mechanism 5, a driving mechanism, a heating mechanism, an ejector plate 6 and a plurality of ejectors 7;

[0047] The movable mold 1 and the static mold 2 are arranged opposite to each other along the Y direction. When the movable mold 1 and the static mold 2 are closed, a closed cavity 100 is formed. A sand inlet hole 101 is provided at the connection between the movable mold 1 and the static mold 2. The sand inlet hole 101 is communicated with the cavity 100. The static mold 2 is provided with a core-pulling hole 102. The movable mold 1 and the static mold 2 are respectively provided with a plurality of ejector holes 103 penetrating along the Y direction.

[0048] One end of the ejector pin 7 is inserted into the ejector hole 103, and the other end of the ejector pin 7 is connected to the ejector plate 6;

[0049] The blade core 3 is arranged in the mold cavity 100, and the blade core 3 includes a plurality of blades 31 and a combination mechanism. The blade 31 is provided with a thin sheet portion 32, and the plurality of thin sheet portions 32 are located in the same side direction of the plurality of blades 31. The blade surfaces of the plurality of blades 31 are closely arranged, and the combination mechanism is used to press the plurality of blades 31; the blade core 3 is connected to the movable end of the core pulling mechanism 4;

[0050] The core pulling mechanism 4 is disposed through the static mold 2, and the movable end of the core pulling mechanism 4 can be reciprocated and arranged in the core pulling hole 102, and the reciprocating movement of the movable end of the core pulling mechanism 4 is used to drive the blade core 3 to move downward to achieve separation or move upward for forming;

[0051] The sand shooting mechanism 5 is provided with a sand shooting hole 51, and the sand shooting hole 51 is arranged opposite to the sand inlet hole 101, and the sand shooting mechanism 5 is used to supply coated sand;

[0052] The driving mechanism is used to drive the movable mold 1 to move closer to or away from the static mold 2 along the Y direction;

[0053] The heating mechanism is used to heat the movable mold 1 , the static mold 2 and the blade core 3 .

[0054] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, when casting the sand core 8, the core pulling mechanism 4 is inserted into the static mold 2, the blade core 3 is fixed to the movable end of the core pulling mechanism 4, the driving mechanism drives the movable mold 1 downward along the Y direction to approach the static mold 2 and close to the mold to form a cavity 100, and the coated sand is injected into the cavity 100 from the sand inlet through the sand shooting mechanism 5, and the coated sand fills the cavity 100 space formed by the combination of the movable mold 1, the static mold 2 and the blade core 3. The heating mechanism heats the movable mold 1, the static mold 2 and the blade core 3, so that the coated sand in the cavity is heated and solidified to form a sand core 8. When opening the mold, the core pulling mechanism 4 first moves the blade core 3 downward to extract the sand core 8, and then the driving mechanism drives the movable mold 1 to move upward to leave the static mold 2. During this period, the upper ejector plate 6 does not move, and the ejector 7 supports the sand core 8 to leave the movable mold 1, and then the upper ejector plate 6 moves upward to leave the sand core 8, and then the lower ejector plate 6 drives its upper ejector 7 to move upward to lift the sand core 8 out of the static mold 2, and the sand core 8 is manually taken away for the next step of processing. The gaps between the plurality of thin-sheet portions 32 are used to form blades of the sand core 8 .

[0055] like Figure 7 and Figure 8 As shown, in a specific embodiment, the combination mechanism is a matching screw and nut, and a plurality of corresponding positioning holes 35 are respectively provided in the middle of a plurality of blades 31. The screw passes through the positioning holes 35 of the multi-layer blades 31, and the multi-layer blades 31 are locked by nuts to form the blade core 3. The multi-layer blades 31 are fixedly stacked in a manner, and the sand core 8 is integrally formed with the dynamic mold 1 and the static mold 2 to improve the accuracy of the sand core 8, and solve the problem that the stacking error caused by the stacking of multiple sand chips causes the overall accuracy of the sand core 8 to fail to meet the accuracy requirements of the aircraft engine.

[0056] Since the blades 31 of the sand core 8 are ultra-thin, the vibration during mold opening can easily cause the sand core 8 to break. After the sand core 8 solidifies, the blade core 3 is first pulled out of the sand core 8 through the core pulling mechanism 4, and then the movable mold 1 and the static mold 2 are opened, and the ejector pin 7 ejects the sand core 8, solving the problem that the sand core 8 cannot be completely separated from the mold.

[0057] Preferably, the core pulling mechanism 4 includes a core pulling cylinder 41, a core pulling guide block 42, a core pulling block 43, a core pulling slider 45 and a connecting block 46, the blade core 3 is installed with the core pulling block 43, the core pulling block 43 is provided with a limiting shaft 431, the core pulling slider 45 is provided with a slide groove 44 matching the limiting shaft 431, the limiting shaft 431 is penetrated by the slide groove 44, the limiting shaft 431 can reciprocate along the slide groove 44, the core pulling slider 45 can be reciprocatingly installed on the core pulling block 43, the slide groove 44 is parallel to the blade surface of the blade 31, and the slide groove 44 forms an angle a with the driving direction of the core pulling cylinder 41, the core pulling guide Block 42 is fixed to the static mold 2, and the core pulling guide block 42 is located at both ends of the core pulling slider 45 and the core pulling block 43. The guiding direction of the core pulling guide block 42 to the core pulling slider 45 is parallel to the driving and retracting direction of the core pulling cylinder 41, and the guiding direction of the core pulling guide block 42 to the core pulling block 43 is perpendicular to the driving and retracting direction of the core pulling cylinder 41. The core pulling guide block 42 is used to limit the moving direction of the core pulling slider 45 and the core pulling block 3, and the connecting block 46 connects the core pulling slider 45 and the driving end of the core pulling cylinder 41, and the core pulling cylinder 41 is used to drive the core pulling slider 45 to move linearly along the driving direction of the core pulling cylinder 41.

[0058] like Figure 1 and Fig.10 As shown, in order to maintain overall stability, the static mold 2 is set close to the ground through the mold foot, and the blade core 3 needs to be pulled downward. The equipment installation space below the blade core 3 is small. By setting an inclined slide 44 and a fixed core-pulling guide block 42, when the core-pulling cylinder 41 drives the core-pulling slider 45 to move horizontally, the core-pulling slider 45 drives the limiting shaft 431, the core-pulling block 43 and the blade core 3 to move vertically as a whole through the upper slide 44. Through the inclined slide 44, the vertical movement of the blade core 3 is converted into the horizontal movement of the core-pulling slider 45, and the driving direction of the core-pulling cylinder 41 is set horizontally, which solves the problems of the small movable distance of the blade core 3, the limited core-pulling direction, and the difficulty in installing the core-pulling mechanism 4, and effectively reduces the volume of the casting device.

[0059] In a specific embodiment, a horizontal axial square through hole is provided in the middle of the core pulling guide block 42, and the core pulling slider 42 is inserted into the square through hole and is restricted to horizontal movement only along the axial direction of the square through hole, while the core pulling block 43 is limited by the core pulling guide blocks 42 at both ends and can only move in a vertical direction perpendicular to the axial direction of the through hole. This structure is adopted in conjunction with the inclined slide groove 44 to realize the change of transmission direction.

[0060] Preferably, the angle a formed by the slide groove 44 and the driving direction of the core-pulling cylinder 41 is in the range of 10° to 30°, and the height of the slide groove 44 in the vertical direction varies by 10 mm.

[0061] When the angle a is less than 10°, the horizontal movement distance of the core pulling slider 45 is too long, which is not conducive to the installation of the core pulling mechanism 4. When the angle a is greater than 30°, the blade core 3 is pulled out too fast, which can easily cause the sand core 8 to break. By adopting a suitable angle, the driving movement of the core pulling cylinder 41 is changed and slowed down, and the blade core 3 is pulled downward by 10 mm as a whole, ensuring that the blade core 3 is smoothly and steadily pulled out of the sand core 8, thereby solving the problem of not being able to smoothly pull out the blade core 3.

[0062] Preferably, the blade surface of the blade 31 is provided with an exhaust groove 33 , the exhaust grooves 33 of adjacent blades 31 are arranged opposite to each other, the exhaust groove 33 is arranged through along the Y direction, and a shallowing portion 34 is provided at one end of the exhaust groove 33 connected to the thin sheet portion 32 .

[0063] Preferably, the width of the exhaust groove 33 is 10 mm, the interval between adjacent exhaust grooves 33 is 5 mm, the depth of the exhaust groove 33 is 0.5 mm, and the depth of the shallow portion 34 is 0.1 mm.

[0064] like Figure 7 and Fig. 9 As shown, during the filling process of the coated sand, the gas between the thin sheet parts 32 of the blades 31 can be discharged through the exhaust grooves 33 between the blades 31, ensuring that the sand core 8 is well formed. The exhaust grooves have a larger gap to facilitate rapid exhaust, and a shallower part 34 with a smaller depth is provided to reduce the gap between the exhaust groove and one end of the cavity 100, thereby preventing the coated sand from leaking out of the exhaust grooves 33.

[0065] Preferably, the heating mechanism is a heating rod, and the movable mold 1, the static mold 2 and the blade core 3 are respectively provided with heating channels 104, and the heating channels 104 are used to install the heating rod.

[0066] In a specific embodiment, a heating channel 104 is provided through the movable mold 1, the static mold 2 and the blade core 3 along the same horizontal direction. The heating rod is detachably installed in the heating channel 104. After the coated sand fills the cavity 100, the heating rod is energized to generate heat, thereby heating the coated sand and solidifying the coated sand to form a sand core 8.

[0067] Preferably, it further comprises an upper mold foot and a lower mold foot, wherein the upper mold foot connects the movable mold 1 and the driving mechanism, and the lower mold foot connects the static mold 2 and an external fixing mechanism.

[0068] Use the upper die foot and the lower die foot to reserve enough space for the installation of the core pulling mechanism 4 and the movement of the ejector plate 6.

[0069] Preferably, the ejector plate 6 includes an upper ejector plate 6 and a lower ejector plate 6 , the upper ejector plate 6 and the lower ejector plate 6 are arranged opposite to each other along the Y direction, and the movable mold 1 and the static mold 2 are arranged between the upper ejector plate 6 and the lower ejector plate 6 .

[0070] In a specific embodiment, the upper ejector plate 6 is disposed above the movable mold 1, and the lower ejector plate 6 is disposed below the static mold 2, so as to facilitate ejecting the sand core 8 from the upper and lower sides to separate from the mold.

[0071] Preferably, the blade 31 has 33 layers, the thickness of the thin sheet portion 32 is not greater than 1.5 mm, the spacing between the thin sheet portions 32 is not greater than 1.8 mm, the depth of the thin sheet portion 32 is not greater than 33 mm, and the draft angle of the thin sheet portion 32 is 0.2°.

[0072] The size of the thin sheet portion 32 of the blade core 3 is the same as the fin portion of the heat sink corresponding to the sand core 8. The maximum thickness of the fin of the heat sink is 1.5mm, the spacing is 1.8mm, the deepest is 33mm, the draft angle is 0.2°, and one heat sink has 33 layers of fins. When conventionally manufactured by stacking 8 layers of sand cores, the manufacturing error of each layer of 8 sand cores is about 0.1mm, and the overall cumulative error exceeds 3mm. By using the sand core 8 as an integral molding, the overall error can be controlled within 0.3mm.

[0073] A sand core mold is cast by the multi-layer ultra-thin heat sink sand core mold casting device described in claims 1-9.

[0074] In one embodiment, after the sand core mold 8 is formed, the maximum width of the grooves corresponding to the heat sink fins on the sand core mold 8 is 1.5 mm, the spacing is 1.8 mm, the deepest is 33 mm, the draft angle is 0.2°, and a sand core mold 8 is provided with grooves corresponding to 33 layers of fins.

[0075] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0076] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-layer ultra-thin heat sink sand core mold casting device, characterized in that: It includes a movable mold, a static mold, a blade core, a core pulling mechanism, a sand shooting mechanism, a driving mechanism, a heating mechanism, an ejector plate and a plurality of ejectors; The movable mold and the static mold are arranged opposite to each other along the Y direction, and a closed cavity is formed when the movable mold and the static mold are closed. A sand inlet hole is provided at the connection between the movable mold and the static mold, and the sand inlet hole is communicated with the cavity. The static mold is provided with a core-pulling hole, and the movable mold and the static mold are respectively provided with a plurality of ejector holes penetrating along the Y direction; One end of the ejector pin is inserted into the ejector pin hole, and the other end of the ejector pin is connected to the ejector pin plate; The blade core is arranged in the mold cavity, the blade core comprises a plurality of blades and a combination mechanism, the blade is provided with a thin sheet portion, the plurality of thin sheet portions are located in the same side direction of the plurality of blades, the blade surfaces of the plurality of blades are arranged closely, and the combination mechanism is used to press the plurality of blades; the blade core is connected to the movable end of the core pulling mechanism; The core pulling mechanism is disposed through the static mold, and the movable end of the core pulling mechanism can be reciprocated and disposed in the core pulling hole. The reciprocating movement of the movable end of the core pulling mechanism is used to drive the blade core to move downward to achieve separation or move upward for forming; The sand shooting mechanism is provided with a sand shooting hole, the sand shooting hole is arranged opposite to the sand inlet hole, and the sand shooting mechanism is used to supply coated sand; The driving mechanism is used to drive the movable mold to move closer to or away from the static mold along the Y direction; The heating mechanism is used to heat the movable mold, the static mold and the blade core.

2. A multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: The core pulling mechanism includes a core pulling cylinder, a core pulling guide block, a core pulling block, a core pulling slider and a connecting block. The blade core is installed with the core pulling block, the core pulling block is provided with a limit shaft, the core pulling slider is provided with a slide groove matching the limit shaft, the limit shaft is passed through the slide groove, the limit shaft can move back and forth along the slide groove, the core pulling slider can be reciprocatingly installed on the core pulling block, the slide groove is parallel to the blade surface of the blade, and the slide groove forms an angle a with the driving direction of the core pulling cylinder, the core pulling guide block is fixed to the static The core pulling guide block is located at both ends of the core pulling slider and the core pulling block, the guiding direction of the core pulling guide block to the core pulling slider is parallel to the driving and retracting direction of the core pulling cylinder, the guiding direction of the core pulling guide block to the core pulling block is perpendicular to the driving and retracting direction of the core pulling cylinder, the core pulling guide block is used to limit the moving direction of the core pulling slider and the core pulling block, the connecting block connects the core pulling slider and the driving end of the core pulling cylinder, and the core pulling cylinder is used to drive the core pulling slider to move linearly along the driving direction of the core pulling cylinder.

3. A multi-layer ultra-thin heat sink sand core mold casting device according to claim 2, characterized in that: The range of the angle a formed by the slide groove and the driving direction of the core-pulling cylinder is 10° to 30°, and the height of the slide groove in the vertical direction changes by 10 mm.

4. A multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: The blade surface of the blade is provided with an exhaust groove, the exhaust grooves of adjacent blades are arranged opposite to each other, the exhaust groove is arranged to penetrate along the Y direction, and a shallowing portion is provided at one end of the exhaust groove connected to the thin sheet portion.

5. A multi-layer ultra-thin heat sink sand core mold casting device according to claim 4, characterized in that: The width of the exhaust groove is 10 mm, the interval between adjacent exhaust grooves is 5 mm, the depth of the exhaust groove is 0.5 mm, and the depth of the shallower part is 0.1 mm.

6. The multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: The heating mechanism is a heating rod, and the movable mold, the static mold and the blade core are respectively provided with heating channels, and the heating channels are used to install the heating rod.

7. The multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: It also includes an upper mold foot and a lower mold foot, wherein the upper mold foot is connected to the movable mold and the driving mechanism, and the lower mold foot is connected to the static mold and an external fixing mechanism.

8. The multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: The ejector plate comprises an upper ejector plate and a lower ejector plate, the upper ejector plate and the lower ejector plate are arranged opposite to each other along the Y direction, and the movable mold and the static mold are arranged between the upper ejector plate and the lower ejector plate.

9. The multi-layer ultra-thin heat sink sand core mold casting device according to claim 1, characterized in that: The blade has 33 layers, the thickness of the thin sheet portion is no more than 1.5 mm, the spacing between the thin sheet portions is no more than 1.8 mm, the depth of the thin sheet portion is no more than 33 mm, and the draft angle of the thin sheet portion is 0.2°.

10. A sand core mold, characterized in that: Cast by the multi-layer ultra-thin heat sink sand core mold casting device described in claims 1-9.

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