High-voltage switch aluminum casting metal mold low-pressure casting process lower mold structure and mold

Abstract

The application relates to the field of high-voltage switch casting technology, in particular to a lower mold structure and a mold under a high-voltage switch aluminum casting metal mold low-pressure casting process, which comprises a lower mold lower half and a lower mold upper half which is detachably connected with the lower mold lower half; the lower mold upper half is provided with a casting cavity, a plurality of inner gate openings and a plurality of embedded inner gate lining openings; the embedded inner gate lining openings are communicated with the casting cavity through the inner gate openings; the lower mold lower half is provided with an embedded direct gate lining opening with a heat-resistant lining in the inside and an embedded cross gate lining recess which is communicated with the embedded direct gate lining opening; the embedded cross gate lining recess is communicated with the embedded inner gate lining openings, heating parts are arranged on the two sides of the embedded cross gate lining recess and are used for heating aluminum liquid in the cross gate; the lower mold structure can realize feeding of the metal liquid, has simple structure, is convenient to operate, is low in cost, has good casting quality, has high production rate, and solves the problems of low production rate, difficult mold demolding and high casting cost in the prior art.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high-voltage switch casting, in particular to a lower mold structure of a high-voltage switch aluminum casting metal mold low-pressure casting process and a mold. BACKGROUND

[0002] With the progress of casting technology, high-voltage switch aluminum castings are largely made by using a metal mold low-pressure casting process. As a main casting process arrangement mode of the low-pressure casting process, horizontal placement of the castings is widely used in the metal mold low-pressure casting process of high-voltage switch aluminum castings, including cover plate type, flange type and cylinder type castings.

[0003] The metal mold low-pressure casting process of horizontal placement of the castings can adopt a riser to supplement the thermal joints of the upper part of the castings, and adopt an ingate to fill the mold and supplement the thermal joints of the lower part of the castings. The gating system of the metal mold low-pressure casting process of horizontal placement of the castings is usually arranged below the castings (filling from bottom to top is stable), and due to the casting process requirement, the ingates connected with the castings are usually arranged at two or more positions, the horizontal gates are arranged to connect the ingates together, and the vertical gates are arranged below the horizontal gates. In the horizontal placement process of the cover plate type and flange type castings, the flange surface of the castings is usually upward, on one hand, filling is stable, and on the other hand, the castings can be demolded by the lower castings being lifted by the top rod after pouring. Usually, the mold is divided into two parts by the top surface of the horizontal gate, and the upper part of the horizontal gate is divided into two parts by the vertical surface of the center line of the castings, so the mold is a lower-left structure. In order to be carried on the upper mold, the mold of the cover plate type, flange type and cylinder type castings can be made into an upper-lower-left structure. When the upper part of the horizontal gate cannot be divided into two parts, the mold can only adopt an upper-lower structure, and the part between the horizontal gate and the castings needs to adopt a movable block or a sand core.

[0004] A Chinese utility model patent with the authorized publication number CN207746396U discloses a metal mold low-pressure casting mold for an automobile full-aluminum thin-wall hollow rear subframe, which comprises an upper mold frame, an upper mold plate, a lower mold plate, a lower mold base and a negative pressure air extraction mechanism. A pair of rear subframe cavities of the upper mold plate and the lower mold plate are respectively provided with a general open gating system, the total cross-sectional area proportion relationship of a plurality of vertical gates, a plurality of horizontal gates and a plurality of ingates is ∑Avertical < ∑Ahorizontal < ∑Aingate, and the cross-sectional area proportion relationship of a single vertical gate, a single horizontal gate and a single ingate is Avertical > Ahorizontal > Aingate. The utility model has the advantages of reasonable mold design and high tensile strength. The cavity adopts a one-mold two-cavity layout, improves the production efficiency, reduces one lifting pipe and improves the relative yield rate. However, since the mold is an upper-lower structure, the horizontal gate is arranged around the castings at the parting surface, the circumference is long, the casting process yield rate is low, and for the thermal joints inside the edge of the castings, the thermal joints cannot be supplemented by the ingates, and need to be rapidly cooled by water cooling, which makes the local part solidify earlier, has high requirements on the water cooling effect, and the water cooling has high requirements on the mold quality and sealing, the mold is complex to make and has high cost.

[0005] A Chinese invention with publication number CN114682765A discloses an aluminum gear chamber low-pressure casting mold, which comprises a metal mold composed of an upper mold and a lower mold, a gear inner cavity sand core, an upper mold cavity of the upper mold, a lower mold cavity of the lower mold, a metal mold cavity, an upper part of the gear inner cavity sand core placed in the lower mold cavity, a casting cavity formed between the upper surface of the upper part of the gear inner cavity sand core and the surface of the upper mold cavity, two sets of pouring systems connected with the casting cavity, the pouring system comprising a straight gate, a horizontal gate, the horizontal gate comprising a horizontal horizontal gate section and a vertical horizontal gate section, one end of the vertical horizontal gate section connected with the inner end of the horizontal horizontal gate section, the other end of the vertical horizontal gate section connected with a gear feeding gate, and the gear feeding gate connected with a mold cavity for forming a gear inner cavity boss located at the middle far end of the casting cavity. The overall design of the mold conforms to the casting solidification temperature field gradient, and can prevent the casting from being retained in the lower mold, reduce deformation, and the feeding system has wide coverage and good feeding effect. However, the structure adopts double lifting pipes and two sets of pouring systems, the sand core is provided with a horizontal gate and a gear feeding gate, the horizontal gate in the sand core is prone to sand sticking, the reuse rate of the horizontal gate is low, and the casting process yield is low.

[0006] It can be seen that in the prior art, the metal mold has strong chilling effect on aluminum liquid, and for the metal mold low-pressure casting process with horizontal gates, in order to ensure the feeding capacity of the inner gate metal liquid, the size of the horizontal gate is usually large, which causes low casting process yield. Some castings have too low process yield due to the horizontal process layout of the horizontal gate, and other process layout methods are adopted. In addition, the casting process pouring system is below the casting, in order to demold the casting with the pouring system, if the mold adopts a lower left three-part mold or an upper and lower left four-part mold structure, the mold is complex and the cost is high; if the mold adopts an upper and lower mold structure, on the one hand, due to the existence of the horizontal gate, the overall pouring system is high, the demolding resistance is large, and problems such as difficulty in demolding, failure to demold or deformation caused by demolding are prone to occur; on the other hand, if a movable block is adopted, the on-site operation is troublesome, and if a sand core is adopted, the surface quality of the casting formed by the metal mold is poor, the reuse rate of the horizontal gate is low, and the cost is high. SUMMARY

[0007] In view of the low yield, demolding difficulty and high cost of the casting in the prior art metal mold low-pressure casting process with horizontal gates, the present application provides a high-voltage switch aluminum casting metal mold low-pressure casting process lower mold structure and mold.

[0008] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0009] The present application provides a high-voltage switch aluminum casting metal mold low-pressure casting process lower mold structure, which comprises a lower mold lower half and a lower mold upper half detachably connected with the lower mold lower half.

[0010] The lower mold upper half is provided with a casting cavity, a plurality of inner gate openings and a plurality of embedded inner gate lining openings; the shape of the casting cavity is consistent with the outer surface of the casting; the inner gate openings and the embedded inner gate lining openings correspond one by one, and one end of the inner gate opening is communicated with the casting cavity, and the other end is communicated with the corresponding embedded inner gate lining opening.

[0011] The lower mold lower half is provided with an embedded straight gate lining opening and an embedded cross gate lining groove; the embedded cross gate lining groove is communicated with the embedded inner gate lining opening; the embedded straight gate lining opening is communicated with the embedded cross gate lining groove; the inner side of the embedded cross gate lining groove is provided with a cross gate heat-resistant lining, and the inner side of the embedded straight gate lining opening is provided with a straight gate heat-resistant lining; the lower mold lower half on both sides of the embedded cross gate lining groove is provided with a heating part.

[0012] Further, the heating part comprises a plurality of heating holes provided on the lower mold lower half on both sides of the embedded cross gate lining groove, and the heating holes are provided with heating pipes.

[0013] Further, the outer side of the embedded cross gate lining groove on the lower mold lower half is provided with a first anti-cannon fire part in the circumferential direction.

[0014] Further, a second anti-cannon fire part is provided on the lower mold upper half corresponding to the position of the first anti-cannon fire part, and the second anti-cannon fire part is connected with the first anti-cannon fire part in a mortise and tenon structure.

[0015] Further, a filter screen mounting part is provided at the joint position of the inner gate opening lower part and the corresponding embedded inner gate lining opening, for mounting a filter screen.

[0016] Further, the inner part of the cross gate heat-resistant lining and the straight gate heat-resistant lining is coated with a heat preservation coating.

[0017] Further, a first positioning part is provided on the lower mold lower half, and a second positioning part is provided on the lower mold upper half corresponding to the position of the first positioning part.

[0018] Further, the distance from the one end of the inner gate opening close to the casting cavity to the parting surface between the lower mold upper half and the lower mold lower part is greater than 30mm, and an inner gate heat-resistant lining is provided on the inner side of the embedded inner gate lining opening.

[0019] Further, the flow area of the heat-resistant lining in the embedded cross gate lining groove is greater than or equal to 1.5 times the flow area of the inner gate heat-resistant lining in the feeding hot spot part.

[0020] The present application provides a high-voltage switch aluminum casting metal mold low-pressure casting process mold, which comprises the above-mentioned lower mold structure.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The lower mold structure of the low-pressure casting process of the high-voltage switch aluminum casting metal mold comprises a lower mold lower half and a lower mold upper half detachably connected with the lower mold lower half. By splitting the lower mold into upper and lower two parts, the structure is simple, and it is convenient to make or install a straight sprue heat-resistant lining in the straight sprue opening, to make or install a horizontal sprue heat-resistant lining in the horizontal sprue groove, and to make or install an inner runner heat-resistant lining in the inner runner opening. A casting cavity, a plurality of inner runner openings and a plurality of embedded inner runner lining opening holes are formed on the lower mold upper half. The shape of the casting cavity is consistent with the outer surface of the casting. The inner runner opening and the embedded inner runner lining opening hole correspond one-to-one, and one end of the inner runner opening is in communication with the casting cavity, and the other end is in communication with the corresponding embedded inner runner lining opening hole. The lower mold lower half is provided with an embedded straight sprue lining opening hole and an embedded horizontal sprue lining groove. The embedded horizontal sprue lining groove is in communication with the embedded inner runner lining opening hole. The embedded straight sprue lining opening hole is in communication with the embedded horizontal sprue lining groove. A horizontal sprue heat-resistant lining is arranged on the inner side of the embedded horizontal sprue lining groove, and a straight sprue heat-resistant lining is arranged on the inner side of the embedded straight sprue lining opening hole. Heating portions are arranged on the lower mold lower half on both sides of the embedded horizontal sprue lining groove. The metal mold, through the heat preservation measure and the heating portion, makes the horizontal sprue and the straight sprue still maintain the aluminum liquid state when the casting is completely solidified. When the pressure is released at the end of pouring, the aluminum liquid in the horizontal sprue, the straight sprue and part of the inner runner flows back to the low-pressure casting furnace for reuse. In this way, the weight of the casting with the pouring system is significantly reduced, the casting process yield is significantly improved, and the casting cost is reduced, thereby further improving the economy of low-pressure casting, and effectively avoiding the problem that the horizontal process arrangement process yield is too low and other process arrangement methods are forced to be used in the casting process design of the casting. Through the arrangement of the heat-resistant lining and the heating portion of the lower mold lower half, heat preservation and heating of the metal mold are realized, the aluminum liquid has strong feeding capacity, the casting quality is better, and the casting quality is further guaranteed without using a sand core structure. When pouring is completed, only the inner runner of the pouring system is solidified, and the demolding of the casting only needs to overcome the frictional resistance of the inner runner above the horizontal sprue, so the demolding resistance is small, and the problems of difficult demolding and demolding deformation of the casting basically do not occur. At the same time, since the blank casting only has an inner runner, the post-pouring riser is easy to clean, and the cleaning workload is small. Compared with three-part molds, four-part molds or upper and lower molds with movable blocks and sand core structures, the on-site operation is simple and the work efficiency is high. The lower mold structure can be applied to the production of various high-quality and high-yield castings in low-pressure casting, and has the characteristics of low cost, wide application and high economic value.

[0023] The heating part comprises a plurality of heating holes arranged on the lower half of the lower mold on both sides of the inlay horizontal gate lining groove, and the heating holes are provided with heating pipes, so that the molten aluminum in the horizontal gate can be heated and kept warm, rapid demolding can be realized, and the molten aluminum can flow back to the low-pressure casting furnace, and the structure is simple.

[0024] The second anti-cannon part is connected with the first anti-cannon part in a mortise and tenon structure, so that the molten aluminum can be prevented from overflowing during low-pressure casting, and the upper and lower parts of the lower mold can be tightly connected.

[0025] The inner gate opening lower part is provided with a filter screen mounting part at the joint position with the corresponding inlay inner gate lining opening, for mounting a filter screen, so that impurities in the molten aluminum can be filtered out, the purity of the molten aluminum is ensured, and the quality of the castings is ensured.

[0026] The heat-resistant lining is coated with a heat-insulating coating inside, so that the heat-insulating coating can ensure the feeding of the castings, ensure the quality of the castings, further protect the heat-resistant lining, and prevent the heat-resistant lining from being damaged when the inner gate is cleaned.

[0027] The first positioning part is arranged on the lower half of the lower mold, and the second positioning part is arranged on the upper half of the lower mold at a position corresponding to the first positioning part, so that the upper and lower parts of the lower mold can be quickly positioned and installed, the installation efficiency is improved, and the installation difficulty is reduced.

[0028] The flow area of the heat-resistant lining in the inlay horizontal gate lining groove is greater than 1.5 times the flow area of the heat-resistant lining in the inner gate, so that the horizontal gate can fully feed the local hot spot part through the inner gate. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a certain high-voltage switch aluminum casting of embodiment 3, wherein a is a front view of the part, and b is a back view of the part.

[0030] Figure 2 It is a high-voltage switch aluminum casting metal mold low-pressure casting process schematic diagram of embodiment 3.

[0031] Figure 3 It is a schematic diagram of the lower mold structure section of the high-voltage switch aluminum casting metal mold low-pressure casting process of embodiment 3.

[0032] Figure 4The lower mold upper half structure schematic diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 3 of the present application.

[0033] Figure 5 The lower mold upper half structure assembly schematic diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 3 of the present application.

[0034] Figure 6 The lower mold lower half structure schematic diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 3 of the present application.

[0035] Figure 7 The lower mold lower half structure assembly diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 3 of the present application.

[0036] Figure 8 The schematic diagram of the high-voltage switch aluminum casting structure of the embodiment 4 of the present application.

[0037] Figure 9 The metal mold low-pressure casting process schematic diagram of the high-voltage switch aluminum casting of the embodiment 4 of the present application.

[0038] Figure 10 The sectional view of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 4 of the present application.

[0039] Figure 11 The lower mold upper half structure schematic diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 4 of the present application.

[0040] Figure 12 The lower mold lower half structure schematic diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 4 of the present application.

[0041] Figure 13 The lower mold lower half structure assembly diagram of the lower mold structure of the metal mold low-pressure casting process of the high-voltage switch aluminum casting of the embodiment 4 of the present application.

[0042] Wherein, 1-lower mold lower half, 2-lower mold upper half, 11-inlay cross-riser inner lining groove, 12-inlay straight-riser inner lining opening, 13-first anti-cannon fire part, 14-heating hole, 15-heating pipe, 16-first positioning part, 17-inner-riser heat-resistant inner lining, 101-cross-riser heat-resistant inner lining, 102-straight-riser heat-resistant inner lining, 21-casting cavity, 22-inlay inner-riser inner lining opening, 23-second anti-cannon fire part, 24-filter screen mounting part, 25-second positioning part, 26-inner-riser opening, 3-arc-shaped top, 4-flange, 5-cylinder. DETAILED DESCRIPTION

[0043] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0044] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0045] The present application will be further described in detail below in conjunction with specific embodiments, which are an explanation of the present application rather than a limitation.

[0046] Embodiment 1

[0047] The application discloses a lower mold structure of a high-voltage switch aluminum casting metal mold low-pressure casting process, which comprises a lower mold lower half 1 and a lower mold upper half 2 detachably connected with the lower mold lower half 1.

[0048] The lower mold upper half 2 is provided with a casting cavity 21, a plurality of inner runner openings 26 and a plurality of embedded inner runner liner openings 22; the shape of the casting cavity 21 is consistent with the outer surface of the casting; the inner runner openings 26 and the embedded inner runner liner openings 22 correspond one-to-one, and one end of the inner runner opening 26 is in communication with the casting cavity 21, and the other end is in communication with the corresponding embedded inner runner liner opening 22;

[0049] The lower mold lower half 1 is provided with an inlaid sprue bushing opening hole 12 and an inlaid cross runner bushing groove 11; the inlaid cross runner bushing groove 11 is communicated with the inlaid inner runner bushing opening hole 22; the inlaid sprue bushing opening hole 12 is communicated with the inlaid cross runner bushing groove 11; a cross runner heat-resistant bushing 101 is arranged on the inner side of the inlaid cross runner bushing groove 11, and a sprue bushing heat-resistant bushing 102 is arranged on the inner side of the inlaid sprue bushing opening hole 12; the lower mold lower half 1 on both sides of the inlaid cross runner bushing groove 11 is provided with a heating part.

[0050] The metal mold, through the heat preservation measures and the heating part, makes the cross runner and the sprue runner still keep the aluminum liquid state when the casting is completely solidified, and when the pressure is released at the end of pouring, the aluminum liquid in the cross runner, the sprue runner and part of the inner runner flows back to the low-pressure casting furnace for reuse, so that the weight of the casting with the pouring system is obviously reduced, the casting process yield is obviously improved, the casting cost is reduced, and the economy of the low-pressure casting is further improved, and the problem that the horizontal process arrangement process yield is too low and other process arrangement modes are forced to be used in the casting process design of the casting can be effectively avoided. Through the setting of the heat-resistant bushing of the lower mold lower half 1 and the heating part, the heat preservation measures are taken for the metal mold, the aluminum liquid has strong feeding capacity, the casting quality is better, the sand core structure is not used, and the casting quality is further ensured. When the casting is demolded, only the friction resistance of the inner runner above the cross runner needs to be overcome, the demolding resistance is small, and the problems of difficult demolding and demolding deformation of the casting basically do not occur. Since the blank casting only has the inner runner, the post-period cleaning of the pouring riser is convenient, and the cleaning workload is small. Compared with the three-part mold, the four-part mold or the upper and lower mold with the movable block and the sand core structure, the on-site operation is simple and the work efficiency is high. The lower mold structure can be applied to the production of various high-quality and high-yield castings in low-pressure casting, and has the characteristics of low cost, wide application, and high economic value.

[0051] Example 2

[0052] The lower mold lower half 1 is provided with an inlaid sprue bushing opening hole 12 and an inlaid cross runner bushing groove 11; the inlaid cross runner bushing groove 11 is communicated with the inlaid inner runner bushing opening hole 22; the inlaid sprue bushing opening hole 12 is communicated with the inlaid cross runner bushing groove 11; a cross runner heat-resistant bushing 101 is arranged on the inner side of the inlaid cross runner bushing groove 11, and a sprue bushing heat-resistant bushing 102 is arranged on the inner side of the inlaid sprue bushing opening hole 12; the lower mold lower half 1 on both sides of the inlaid cross runner bushing groove 11 is provided with a heating part.

[0053] The lower mold upper half is provided with a casting cavity 21, a plurality of inner gate openings 26 and a plurality of embedded inner gate lining openings 22; the shape of the casting cavity 21 is consistent with the outer surface of the casting; the inner gate opening 26 corresponds to the embedded inner gate lining opening 22, and one end of the inner gate opening 26 communicates with the casting cavity 21, and the other end communicates with the corresponding embedded inner gate lining opening 22; the lower mold lower half 1 and the lower mold upper half 2 are parting along the top surface of the embedded cross runner lining groove 11; the embedded straight runner lining opening 12 communicates with the embedded cross runner lining groove 11, and the diameter of the embedded straight runner lining opening 12 is the same as the width of the embedded cross runner lining groove 11, the inner diameter of the lower opening of the embedded straight runner lining opening 12 is greater than or equal to 5mm larger than the inner diameter of the riser pipe, and less than or equal to the inner diameter of the riser pipe plus 20mm, the height of the embedded straight runner lining opening 12 is greater than or equal to 20mm, and less than or equal to 35mm; the inner side of the embedded cross runner lining groove 11 is provided with a cross runner heat-resistant lining 101, and the inner side of the embedded straight runner lining opening 12 is provided with a straight runner heat-resistant lining 102, and the inner sides of the cross runner heat-resistant lining 101 and the straight runner heat-resistant lining 102 are coated with a heat preservation coating; the wall thickness of the straight runner heat-resistant lining 102 on the inner side of the embedded straight runner lining opening 12 is greater than or equal to 5mm, and the gap between the embedded straight runner lining opening 12 is less than or equal to 1mm, and the height is less than or equal to 1mm of the embedded straight runner lining opening 12, the heat preservation coating is a high temperature resistant coating such as zinc oxide coating, and the coating thickness is less than or equal to 1mm; the heat-resistant lining inside the embedded cross runner lining groove 11 is a shell structure, the wall thickness is greater than or equal to 5mm, and the fitting gap between the embedded cross runner lining groove 11 is less than or equal to 1mm, and the heat-resistant lining is a ceramic material or a refractory material; the lower mold lower half 1 on both sides of the embedded cross runner lining groove 11 is provided with a heating part, the heating part includes a plurality of heating holes 14 provided on the lower mold lower half 1 on both sides of the embedded cross runner lining groove 11, the heating holes 14 are installed with heating pipes 15, and the length of the heating holes 14 is greater than the distance from the side of the embedded cross runner lining groove 11 away from the entrance of the heating hole 14 to the entrance of the heating hole 14. Preferably, if the inner gate height is less than or equal to 30mm, the inner gate heat-resistant lining 17 can not be needed, otherwise the inner gate heat-resistant lining 17 height is greater than or equal to 10mm, when the inner gate heat-resistant lining 17 exists, the inner side of the inner gate heat-resistant lining 17 is coated with a heat preservation layer.

[0054] The first anti-cannon part 13 is arranged on the lower half of the lower mold 1 along the circumference of the outer part of the gate heat-resistant lining 101 in the gate runner lining groove 11. The second anti-cannon part 23 is arranged on the upper half of the lower mold 2 at the position corresponding to the first anti-cannon part 13, and the second anti-cannon part 23 is connected with the first anti-cannon part 13 in a mortise and tenon structure. The width of the first anti-cannon part 13 and the second anti-cannon part 23 is greater than or equal to 10 mm, the height is greater than or equal to 10 mm, and the draft is greater than or equal to 5°. The fitting gap between the first anti-cannon part 13 and the second anti-cannon part 23 is less than 0.5 mm. The lower part of the gate opening 26 is provided with a filter screen mounting part 24 at the position connected with the gate runner lining opening 22. The distance between the filter screen mounting part 24 and the surface of the casting is 5-20 mm. The draft between the filter screen mounting part 24 and the surface of the casting is not less than 2°. If the upper half of the lower mold 2 does not have the gate runner lining opening 22, the surface below the filter screen mounting part 24 is the same as the parting surface of the upper half of the lower mold 2. If the upper half of the lower mold 2 has the gate runner lining opening 22, the gap between the gate runner lining opening 22 and the gate heat-resistant lining 17 of the upper half of the lower mold 2 is less than or equal to 1 mm. The depth of the gate runner lining opening 22 is greater than the height of the gate heat-resistant lining, and less than or equal to the height of the gate heat-resistant lining 17 plus 0.2 mm. The glass silk is wound around the outer circumference of the gate heat-resistant lining 17, so that the gate heat-resistant lining 17 can be installed in the gate runner lining opening 22 of the upper half of the lower mold 2. The first positioning part 16 is arranged on the lower half of the lower mold 1, and the second positioning part 25 is arranged on the upper half of the lower mold 2 at the position corresponding to the first positioning part 16. The second positioning part 25 is arranged on the parting surface of the upper half of the lower mold 2, and is a pair of diagonal positioning pins. The first positioning part 16 is a positioning hole matched with the positioning pin. The fitting gap between the positioning pin and the positioning hole is less than 0.5 mm.

[0055] In the assembly, the straight gate heat-resistant lining 102 coated with a thermal insulation layer is wound with glass silk and installed in the inlaid straight gate lining opening 12 of the lower half of the lower mold 1. The gate heat-resistant lining 101 coated with a thermal insulation layer is installed in the inlaid gate runner lining groove 11 of the lower half of the lower mold 1. The gate heat-resistant lining 17 coated with a thermal insulation layer is wound with glass silk and installed in the inlaid gate lining opening 22 of the upper half of the lower mold 2. The lower half of the lower mold 1 and the upper half of the lower mold 2 are closed and fixed together to complete the assembly of the lower mold.

[0056] Example 3

[0057] Referring to Figures 1 to 7 , the application provides a high-pressure switch aluminum casting metal mold low-pressure casting process lower mold structure, which is a lower mold structure of a high-pressure switch aluminum cover plate casting:

[0058] The high-voltage switch aluminum cover plate casting is horizontally placed, the flange 4 is above, the arc-shaped top 3 is below, the inner gates are arranged at the middle position of the arc-shaped top 3 and the position of the thick boss structure, a horizontal cross gate is arranged below the inner gates and connects the two inner gates, and a straight gate is arranged below the cross gate.

[0059] The lower half of the lower mold 1 is detachably connected with the upper half of the lower mold 2.

[0060] The lower half of the lower mold 1 is detachably connected with the upper half of the lower mold 2.

[0061] The mosaic cross-riser lining groove 11 communicates with the mosaic inner-riser lining hole 22; the lower mold lower half 1 and the lower mold upper half 2 are parting along the top surface of the mosaic cross-riser lining groove 11; the mosaic straight-riser lining hole 12 communicates with the mosaic cross-riser lining groove 11, and the aperture of the mosaic straight-riser lining hole 12 is the same as the width of the mosaic cross-riser lining groove 11, the inner diameter of the lower opening of the mosaic straight-riser lining hole 12 is greater than or equal to 5mm larger than the inner diameter of the riser pipe, and less than or equal to the inner diameter of the riser pipe plus 20mm, the height of the mosaic straight-riser lining hole 12 is greater than or equal to 20mm, and less than or equal to 35mm; the inner side of the mosaic cross-riser lining groove 11 is provided with a cross-riser heat-resistant lining 101, and the inner side of the mosaic straight-riser lining hole 12 is provided with a straight-riser heat-resistant lining 102, and the inside of the cross-riser heat-resistant lining 101 and the straight-riser heat-resistant lining 102 is coated with a heat preservation coating; the wall thickness of the straight-riser heat-resistant lining 102 is greater than or equal to 5mm, and the gap between the straight-riser heat-resistant lining 102 and the mosaic straight-riser lining hole 12 is less than or equal to 1mm, and the height is less than or equal to 1mm of the mosaic straight-riser lining hole 12, the heat preservation coating is a high-temperature resistant coating, such as zinc oxide coating, and the coating thickness is less than or equal to 1mm; the cross-riser heat-resistant lining 101 is a shell structure, the wall thickness is greater than or equal to 5mm, and the fitting gap between the cross-riser heat-resistant lining 101 and the mosaic cross-riser lining groove 11 is less than or equal to 1mm, and the heat-resistant lining is a ceramic material or a refractory material; the distance from the end of the inner-riser hole 26 close to the cavity 21 of the casting to the parting surface between the lower mold upper half 2 and the lower mold lower half 1 is greater than 30mm, and the inner side of the mosaic inner-riser lining hole 22 is provided with an inner-riser heat-resistant lining 17, which is coated with a zinc oxide coating inside, and the flow area of the heat-resistant lining in the mosaic cross-riser lining groove 11 is greater than or equal to 1.5 times the flow area of the inner-riser heat-resistant lining 17.

[0062] The inner side of the mosaic cross-riser lining groove 11 and the mosaic straight-riser lining hole 12 is provided with a heat-resistant lining, and the inside of the heat-resistant lining is coated with a heat preservation coating;

[0063] The first anti-cannon part 13 is circumferentially arranged on the outer side of the heat-resistant lining of the mosaic cross-riser lining groove 11 on the lower mold lower half 1; the second anti-cannon part 23 is arranged on the lower mold upper half 2 corresponding to the position of the first anti-cannon part 13, the second anti-cannon part 23 and the first anti-cannon part 13 are connected in a mortise and tenon structure, the width of the first anti-cannon part 13 and the second anti-cannon part 23 is greater than or equal to 10mm, the height is greater than or equal to 10mm, the draft is greater than or equal to 5°, and the fitting gap between the first anti-cannon part 13 and the second anti-cannon part 23 is less than 0.5mm. The inner-riser hole 26 is provided with a filter screen mounting part 24 at the joint position of the inner-riser hole 26 and the corresponding mosaic inner-riser lining hole 22, which is used for mounting the filter screen.

[0064] The filter screen mounting portion 24 is 5-20 mm away from the surface of the casting, the draft angle between the filter screen mounting portion 24 and the surface of the casting is not less than 2°, if the lower mold upper half 2 is not inlaid with the sprue bushing opening, the surface below the filter screen mounting portion 24 is the same as the parting surface of the lower mold upper half 2, and the total flow area of the filter screen mounting portion 24 should be greater than the flow area of the straight sprue bushing 17; if the lower mold upper half 2 is provided with the inlaid sprue bushing opening 22, the gap between the inlaid sprue bushing opening 22 of the lower mold upper half 2 and the inner sprue bushing 17 is not greater than 1 mm, the depth of the inlaid sprue bushing opening 22 is greater than the height of the inner sprue bushing, and is less than or equal to the height of the inner sprue bushing 17 plus 0.2 mm, the glass filaments are wound around the outer periphery of the inner sprue bushing 17, the inner sprue bushing 17 can be installed in the inlaid sprue bushing opening 22 of the lower mold upper half 2, and the parting surface of the lower mold upper half 2 is provided with diagonal positioning pins matched with the positioning holes of the lower mold lower half 1, and the gap is less than 0.5 mm. The lower mold lower half 1 is provided with a first positioning portion 16, and the lower mold upper half 2 is provided with a second positioning portion 25 at a position corresponding to the first positioning portion 16. The gap between the first positioning portion 16 and the second positioning portion 25 is less than 0.5 mm, the first positioning portion 16 and the second positioning portion are connected through pin hole cooperation, the hole diameter is greater than or equal to 20 mm, the depth is greater than or equal to 20 mm, and the draft angle is not less than 5°.

[0065] In assembly, the straight sprue bushing 102 coated with the thermal insulation layer is wound with glass filaments and is installed in the inlaid straight sprue bushing opening 12 of the lower mold lower half 1. The horizontal sprue bushing 101 coated with the thermal insulation layer is installed in the inlaid horizontal sprue bushing groove 11 of the lower mold lower half 1, and the inner sprue bushing 17 coated with the thermal insulation layer is wound with glass filaments and is installed in the inlaid inner sprue bushing opening 22 of the lower mold upper half 2. The lower mold lower half 1 and the lower mold upper half 2 are closed and fixed together, and the assembly of the lower mold is completed.

[0066] Example 4

[0067] Reference Figures 8 to 13 The present application provides a high-voltage switch aluminum casting metal mold low-pressure casting process lower mold structure, which is a lower mold structure of a high-voltage switch aluminum sleeve casting part. The part body is a cylinder 5 with flange structures at both ends. There is a circular groove on the back of each flange, and each flange has 12 straight holes. The sleeve is placed horizontally, and the two flanges of the cylinder 5 are connected to the inner sprue below, respectively. The horizontal sprue below the horizontal sprue connects the two inner sprues, and the straight sprue is arranged below the horizontal sprue. The lower mold structure comprises a lower mold lower half 1 and a lower mold upper half 2 detachably connected with the lower mold lower half 1.

[0068] The lower mold upper half 2 is provided with a casting cavity 21, a plurality of inner gate openings 26 and a plurality of embedded inner gate lining openings 22; the shape of the casting cavity 21 is consistent with the outer surface of the casting; the inner gate opening 26 corresponds to the embedded inner gate lining opening 22, and one end of the inner gate opening 26 communicates with the casting cavity 21, and the other end communicates with the corresponding embedded inner gate lining opening 22;

[0069] The lower mold lower half 1 is provided with an embedded straight gate lining opening 12 and an embedded cross gate lining groove 11; the embedded cross gate lining groove 11 communicates with the embedded inner gate lining opening 22; the lower mold lower half 1 and the lower mold upper half 2 are parted along the top surface of the embedded cross gate lining groove 11; the embedded straight gate lining opening 12 communicates with the embedded cross gate lining groove 11, and the diameter of the embedded straight gate lining opening 12 is the same as the width of the embedded cross gate lining groove 11, the inner diameter of the riser pipe is greater than or equal to 5mm, and less than or equal to the inner diameter of the riser pipe plus 20mm, the height of the embedded straight gate lining opening 12 is greater than or equal to 20mm, and less than or equal to 35mm; the inner side of the embedded cross gate lining groove 11 is provided with a cross gate heat-resistant lining 101, and the inner side of the embedded straight gate lining opening 12 is provided with a straight gate heat-resistant lining 102, the inside of the cross gate heat-resistant lining 101 and the straight gate heat-resistant lining 102 is coated with a heat preservation coating; the wall thickness of the straight gate heat-resistant lining 102 is greater than or equal to 5mm, and the gap between the straight gate heat-resistant lining 102 and the embedded straight gate lining opening 12 is less than or equal to 1mm, and the height is less than or equal to 1mm of the embedded straight gate lining opening 12, the heat preservation coating is a high-temperature resistant coating such as zinc oxide coating, and the coating thickness is less than or equal to 1mm; the cross gate heat-resistant lining 101 is a shell structure, and the wall thickness is greater than or equal to 5mm, and the fitting gap between the cross gate heat-resistant lining 101 and the embedded cross gate lining groove 11 is less than or equal to 1mm, and the heat-resistant lining is a ceramic material or a refractory material; the distance from the inner gate opening 26 close to the side of the casting cavity 21 to the embedded cross gate lining groove 11 is less than or equal to 30mm.

[0070] The inner side of the embedded cross gate lining groove 11 and the embedded straight gate lining opening 12 is provided with a heat-resistant lining, and the inside of the heat-resistant lining is coated with a heat preservation coating; the lower mold lower half 1 on both sides of the embedded cross gate lining groove 11 is provided with a heating part, the heating part includes a plurality of heating holes 14 provided on the lower mold lower half 1 on both sides of the embedded cross gate lining groove 11, and the heating holes 14 are installed with heating pipes 15; the length of the heating hole 14 is greater than the distance from the side of the embedded cross gate lining groove 11 away from the entrance of the heating hole 14 to the entrance of the heating hole 14.

[0071] The outer part of the hot runner heat-resistant lining 101 is provided with a first anti-cannon fire part 13 on the lower half of the lower mold 1 in the circumferential direction; the second anti-cannon fire part 23 is provided at the position corresponding to the first anti-cannon fire part 13 on the upper half of the lower mold 2, and the second anti-cannon fire part 23 is connected with the first anti-cannon fire part 13 in a mortise and tenon structure, the width of the first anti-cannon fire part 13 and the second anti-cannon fire part 23 is greater than or equal to 10 mm, the height is greater than or equal to 10 mm, the draft is greater than or equal to 5°, and the fitting gap between the first anti-cannon fire part 13 and the second anti-cannon fire part 23 is less than 0.5 mm. The lower part of the inner gate opening 26 is provided with a filter screen mounting part 24 at the joint position with the corresponding inlaid inner gate lining opening 22, which is used for mounting the filter screen, the distance between the filter screen mounting part 24 and the surface of the casting is 5-20 mm, the draft between the filter screen mounting part 24 and the surface of the casting is not less than 2°, if the upper half of the lower mold 2 does not have an inlaid inner gate lining opening, the surface below the filter screen mounting part 24 is the same as the parting surface of the upper half of the lower mold 2; the parting surface of the upper half of the lower mold 2 has a pair of diagonal positioning pins matched with the positioning holes of the lower half of the lower mold 1, and the gap is less than 0.5 mm. The first positioning part 16 is provided on the lower half of the lower mold 1, and the second positioning part 25 is provided at the position corresponding to the first positioning part 16 on the upper half of the lower mold 2. The fitting gap between the first positioning part 16 and the second positioning part 25 is less than 0.5 mm, the first positioning part 16 and the second positioning part are connected in a pin hole fitting mode, the hole diameter is greater than or equal to 20 mm, the depth is greater than or equal to 20 mm, and the draft is not less than 5°.

[0072] In the assembly, the straight gate heat-resistant lining 102 coated with a thermal insulation layer is wound with glass silk and is loaded into the inlaid straight gate lining opening 12 of the lower half of the lower mold 1; the transverse gate heat-resistant lining 101 coated with a thermal insulation layer is loaded into the inlaid transverse gate lining groove 11 of the lower half of the lower mold 1; the lower half of the lower mold 1 is combined with the upper half of the lower mold 2, and is fixed together, thereby completing the assembly of the lower mold.

[0073] Example 5

[0074] The application also provides a high-voltage switch aluminum casting metal mold low-pressure casting process mold, which comprises the lower mold structure in any one of examples 1 to 4. The mold has the advantages of simple structure, convenient operation, easy demolding, low cost, good casting quality, and high yield, and is an advanced technology in the field of low-pressure casting.

[0075] It should be noted that the lower mold structure provided by the application can set the shape of the casting cavity 21 and the positions of various gates according to the shape and process of the actual part, and is not limited to the shape and position of the aluminum casting part of the high-voltage switch in the examples of the application, and therefore is not limited to the low-pressure casting process of the aluminum casting of the high-voltage switch, and any part mold designed according to the design idea of the application is considered to be within the protection scope of the application.

[0076] In summary, the application provides a high-voltage switch aluminum casting metal mold low-pressure casting process lower mold structure and mold, by dividing the lower mold into two parts, and setting heating part and heat preservation part on both sides of the recess 11 in the inlaid cross-riser of the lower half, realizing feeding of the metal liquid, and the feeding capacity is strong, compared with the existing three-opening mold, four-opening mold or using the upper and lower opening mold structure of the movable block and sand core, the structure has the characteristics of simple structure, convenient operation and low cost, at the same time, only the friction force above the cross-riser needs to be overcome in the demolding process, the demolding is convenient and not easy to deform, and the metal liquid in the cross-riser can flow back to the low-pressure casting furnace for repeated use, the casting quality is good and the yield is high, further improving the economy of low-pressure casting.

[0077] The above only describes the preferred embodiments of the application, and is not intended to limit the technical solutions of the application in any way. Those skilled in the art should understand that the technical solutions can be modified and replaced in several simple ways without departing from the spirit and principles of the application, and these modifications and replacements also fall within the protection scope of the claims.

Claims

1. A structure of a lower mold for a high-voltage switch aluminum casting die low-pressure casting process, characterized by, The lower mold lower half (1) and the lower mold upper half (2) are detachably connected; The lower mold upper half (2) is provided with a casting cavity (21), a plurality of inner gate openings (26) and a plurality of embedded inner gate lining openings (22); the shape of the casting cavity (21) is consistent with the outer surface of the casting; the inner gate openings (26) and the embedded inner gate lining openings (22) correspond one by one, and one end of the inner gate opening (26) is communicated with the casting cavity (21), and the other end is communicated with the corresponding embedded inner gate lining opening (22); The lower mold lower half (1) is provided with an embedded straight gate lining opening (12) and an embedded cross gate lining groove (11); the embedded cross gate lining groove (11) is communicated with the embedded inner gate lining opening (22); the embedded straight gate lining opening (12) is communicated with the embedded cross gate lining groove (11); the inner side of the embedded cross gate lining groove (11) is provided with a cross gate heat-resistant lining (101), and the inner side of the embedded straight gate lining opening (12) is provided with a straight gate heat-resistant lining (102); the lower mold lower half (1) on both sides of the embedded cross gate lining groove (11) is provided with a heating part.

2. The high-voltage switch aluminum casting mold low-pressure casting process lower mold structure according to claim 1, characterized in that, The heating part includes a plurality of heating holes (14) provided on the lower mold lower half (1) on both sides of the embedded cross gate lining groove (11), and the heating holes (14) are installed with heating pipes (15).

3. The high voltage switch aluminum casting mold lo- pressure casting process down mold structure according to claim 1, characterized in that, The outer side of the embedded cross gate lining groove (11) on the lower mold lower half (1) is provided with a first anti-cannon part (13) in the circumferential direction.

4. The high-voltage switch aluminum casting mold low-pressure casting process lower mold structure according to claim 3, characterized in that, The lower mold upper half (2) is provided with a second anti-cannon part (23) corresponding to the position of the first anti-cannon part (13), and the second anti-cannon part (23) and the first anti-cannon part (13) are connected in a mortise and tenon structure.

5. The high pressure switch aluminum casting mold lo- pressure casting process down mold structure according to claim 1, characterized in that, The inner gate opening (26) is provided with a filter screen mounting part (24) at the position where the lower part is connected with the corresponding embedded inner gate lining opening (22), which is used for installing a filter screen.

6. The high-voltage switch aluminum casting mold low-pressure casting process down mold structure according to claim 1, characterized in that, The inner side of the cross gate heat-resistant lining (101) and the straight gate heat-resistant lining (102) is coated with a heat preservation coating.

7. The high pressure switch aluminum casting mold lo- pressure casting process down mold structure according to claim 1, characterized in that, The lower mold lower half (1) is provided with a first positioning part (16), and the lower mold upper half (2) is provided with a second positioning part (25) corresponding to the position of the first positioning part (16).

8. The high pressure switch aluminum casting mold lo- pressure casting process down mold structure according to claim 1, characterized in that, The distance from the end of the inner gate opening (26) close to the casting cavity (21) to the parting surface between the lower mold upper half (2) and the lower mold lower half (1) is greater than 30mm, and the inner side of the embedded inner gate lining opening (22) is provided with an inner gate heat-resistant lining (17).

9. The high-voltage switch aluminum casting mold low-pressure casting process down mold structure according to claim 8, characterized in that, The flow area of the heat-resistant lining in the embedded cross gate lining groove (11) is greater than 1.5 times the flow area of the inner gate heat-resistant lining (17) in the feeding hot spot part.

10. A high-voltage switch aluminum casting metal mold low-pressure casting process mold characterized by, The lower mold structure of any one of claims 1-9.

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