Preheated die casting mold for motor housing

Abstract

The present invention discloses a preheating die-casting mold for a motor housing, and relates to the technical field of motor manufacturing, including a frame and a lower die seat and an upper die seat installed in the frame, and also includes a preheating component, which is elastically installed between the lower die seat and the upper die seat, and a mold core that runs through the preheating component is installed at the bottom of the upper die seat, and a mold cavity and an annular heat storage cavity located at the periphery of the mold cavity are provided on the lower die seat, and the two are connected, and an annular opening and closing part and a lifting mechanism are movably embedded in the annular heat storage cavity, and the top of the annular opening and closing part is cushioned on the bottom of the mold cavity, and the connection between the mold cavity and the annular heat storage cavity is blocked. The present invention can preheat the mold core of the upper die seat in advance during the pressing process of the upper die seat by setting a preheating component elastically connected between the lower die seat and the upper die seat, and at the same time, a part of the heat enters the mold cavity and the annular heat storage cavity outside the mold cavity, and the lower die seat is fully preheated, thereby improving the comprehensiveness of the preheating, and at the same time, the airflow in the annular heat storage cavity can be recycled.

Description

Technical Field

[0001] The invention relates to the technical field of motor manufacturing, in particular to a preheating die-casting mold for a motor housing. Background Art

[0002] In cold chamber die casting, the cold chamber refers to the mold cavity. The temperature of die casting will directly affect the molding state of the product. If the mold temperature is too low, the cooling time of the molten metal will be greatly shortened, resulting in poor product molding. The mold needs to be preheated.

[0003] The patent publication number of the existing patent application is: CN206578272U, and the publication date is October 24, 2017. The name of the patent is "A preheating device for a die-casting mold". The patent includes a burner, and the burner includes at least three branch pipes. The right ends of the at least three branch pipes are connected through a main pipe. An air intake connector is connected to the right side of the main pipe. The air intake connector includes a natural gas connector and a compressed air connector. The natural gas connector is connected to the compressed air connector and forms a Y shape. A number of mounting holes are evenly arranged on both sides of the branch pipe, and burner heads are embedded in the several mounting holes. The several burner heads are connected to the inside of the branch pipe. The technical solution is simple and reasonable in structure, easy to use, and has a good preheating effect.

[0004] The above application has shortcomings. The burner has a simple structure and cannot be directly adapted to the die-casting mold when in use. The mold is generally preheated by hand. The degree of preheating each time cannot be guaranteed, and the upper and lower mold bases cannot be fully preheated, which affects the molding quality of the workpiece. The heat flow generated during combustion cannot be fully utilized, and the heat is easily lost and wasted. If the burner is embedded in the mold to heat it, the heat cannot be quickly discharged after the preheating is completed, which affects the cooling time of the workpiece. Summary of the invention

[0005] The object of the present invention is to provide a preheating die-casting mold for a motor housing to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The preheating die-casting mold for a motor housing comprises a frame and a lower die base and an upper die base installed in the frame, and also comprises a preheating component, which is elastically installed between the lower die base and the upper die base, and a mold core penetrating the preheating component is installed at the bottom of the upper die base, and a mold cavity and an annular heat storage cavity located at the periphery of the mold cavity are provided on the lower die base, and the two are connected, and an annular opening and closing part and a lifting mechanism are movably embedded in the annular heat storage cavity, and the top of the lifting mechanism is cushioned on the bottom of the mold cavity, and the connection between the mold cavity and the annular heat storage cavity is blocked. When the upper die base moves up, the lifting mechanism is first lifted, and then the annular opening and closing part is driven down, and the annular opening and closing part is forced to close, so that the airflow in the annular heat storage cavity is pressed into the mold cavity.

[0008] Preferably, the preheating assembly includes a heat-conducting pad, in which a gas pipeline is laid, and a plurality of flame nozzles connected to the gas pipeline are distributed in an annular array on the bottom surface of the heat-conducting pad. The flame nozzles are located above the annular heat storage chamber, and the nozzles of the flame nozzles face the mold core.

[0009] Preferably, a plurality of top springs are installed at the bottom of the thermally conductive pad, a receiving groove is provided on the top surface of the lower mold base, the bottom end of the top spring abuts against the receiving groove, and the top end abuts against the bottom surface of the thermally conductive pad.

[0010] Preferably, a shift block for opening and closing the gas pipeline is elastically hinged on the top of the thermally conductive pad.

[0011] Preferably, the annular opening and closing part includes a piston ring located in the annular heat storage chamber, the piston ring having a plurality of through holes vertically passing through the piston ring, a sealing ring being rotatably connected to the bottom of the piston ring, a through groove corresponding to the through hole being provided on the sealing ring, push-pull rods being rotatably connected to both sides of the bottom of the piston ring, an adjusting gear being fixedly connected to the top of the push-pull rod, the bottom of which is transmission-connected to the upper mold base, and an arc-shaped rack meshing with the adjusting gear being provided on the inner wall of the through groove.

[0012] Preferably, transmission gears are rotatably installed on both sides of the frame, and upper and lower racks respectively meshing with both sides of the transmission gears are slidably installed on the side walls of the frame, the upper rack is fixedly connected to the upper mold base, and a push rod is fixedly connected to the bottom of the lower rack, the bottom end of the push-pull rod passes through the push rod and is fixedly connected to a sliding claw sleeve, and the bottom of the push rod is fixedly connected to a claw ring that abuts and cooperates with the sliding claw sleeve.

[0013] Preferably, the push-pull rod outer sleeve is provided with a return spring, and the return spring is located in the annular heat storage chamber.

[0014] Preferably, the lifting mechanism includes a lifting frame plugged into the bottom of the frame, a pushing plate is installed on the top of the lifting frame inside the mold cavity, and a lifting bracket matching the lifting frame is slidably installed on the back of the upper mold base. When the upper mold base rises, the lifting frame is lifted by the lifting bracket.

[0015] Preferably, a baffle ring is fixedly connected to the bottom of the thermally conductive pad, and the baffle ring is located above the annular heat storage cavity.

[0016] Preferably, a plurality of air guide grooves are provided on the outer peripheral surface of the push plate, and a sealing protrusion matching the air guide grooves is fixed on the inner wall of the mold cavity.

[0017] In the above technical scheme, by providing a preheating component elastically connected between the lower mold base and the upper mold base, the mold core of the upper mold base can be preheated in advance during the pressing process of the upper mold base, and at the same time, part of the heat enters the mold cavity and the annular heat storage cavity outside the mold cavity. The annular heat storage cavity can collect part of the heat outside the mold cavity, allowing the lower mold base to fully absorb the heat and fully preheat the lower mold base, thereby improving the comprehensiveness of the preheating. At the same time, the airflow in the annular heat storage cavity can be recycled and utilized. During demolding, the lifting mechanism lifts the shell, and after a gap is generated between the bottom of the shell and the mold cavity, the airflow in the annular heat storage cavity is pressed into the mold cavity. Under the pressure change, the shell can be demolded more quickly, and the heat in the annular heat storage cavity will be quickly discharged, thereby improving the efficiency of shell cooling and molding.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0019] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the preheating die-casting mold for the motor housing of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of a frame in a preheating die-casting mold for a motor housing of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a preheating component in a preheating die-casting mold for a motor housing according to the present invention;

[0024] Figure 4 It is a structural schematic diagram of a lower die seat in a preheating die-casting die for a motor housing of the present invention;

[0025] Figure 5It is a cross-sectional view of a lower die seat in a preheating die-casting die for a motor housing of the present invention;

[0026] Figure 6 It is a structural schematic diagram of an annular opening and closing member in a preheating die-casting mold for a motor housing according to the present invention;

[0027] Figure 7 It is a transmission schematic diagram of the upper die seat and the annular opening and closing member in the preheating die-casting die for the motor housing of the present invention;

[0028] Figure 8 This is an enlarged view of point A of the preheating die-casting mold for the motor housing of the present invention.

[0029] Description of reference numerals:

[0030] 1. Frame; 101. Limiting guide column; 102. Sleeve; 2. Lower die base; 201. Cavity; 202. Annular heat storage cavity; 203. Accommodation groove; 204. Sealing protrusion; 205. Conveying channel; 3. Upper die base; 301. Core; 303. Lifting bracket; 304. Hydraulic push rod; 4. Preheating assembly; 401. Heat-conducting pad; 402. Gas pipeline; 403. Flame-spraying nozzle; 404. Dial block; 405. Top spring; 406. Retaining ring; 5. Annular opening and closing part; 501. Piston ring; 502. Through hole; 503. Sealing ring; 504. Through groove; 505. Push-pull rod; 506. Adjusting gear; 507. Arc-shaped rack; 508. Sliding claw sleeve; 509. Reset spring; 6. Lifting mechanism; 601. Lifting frame; 602. Pushing plate; 604. Air guide groove; 7. Transmission gear; 701. Upper rack; 702. Lower rack; 703. Push rod; 704. Claw ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] See also Figure 1-8The preheating die-casting mold for a motor housing provided by an embodiment of the present invention comprises a frame 1 and a lower die base 2 and an upper die base 3 installed in the frame 1, and also comprises a preheating component 4, which is elastically installed between the lower die base 2 and the upper die base 3, and a mold core 301 penetrating the preheating component 4 is installed at the bottom of the upper die base 3, and a mold cavity 201 and an annular heat storage cavity 202 located at the periphery of the mold cavity 201 are provided on the lower die base 2, and the two are connected, and an annular opening and closing piece 5 and a lifting mechanism 6 are movably embedded in the annular heat storage cavity 202, and the top of the annular opening and closing piece 5 is cushioned on the bottom of the mold cavity 201, and the connection between the mold cavity 201 and the annular heat storage cavity 202 is blocked. When the upper die base 3 moves up, the lifting mechanism 6 is first lifted, and then the annular opening and closing piece 5 is driven to descend, and the annular opening and closing piece 5 is forced to close, so that the airflow in the annular heat storage cavity 202 is pressed into the mold cavity 201.

[0033] Specifically, the lower die base 2 is fixed in the frame 1, and a plurality of limit guide pillars 101 are installed on the top of the upper die base 3 and the frame 1. The upper die base 3 is slidably installed in the frame 1, and a plug hole for the limit guide pillars 101 to pass through is vertically opened on the upper die base 3. A hydraulic push rod 304 is installed on the top of the upper die base 3. When the hydraulic push rod 304 is controlled to lift the upper die base 3, the limit guide pillars 101 can prevent the upper die base 3 from deflecting. At the same time, when the upper die base 3 is pressed against the lower die base 2, the mold core 301 on the upper die base 3 will The mold core 301 is gradually passed through the preheating assembly 4, so that the preheating assembly 4 can preheat the mold core 301 before the mold is closed, and then the upper mold base 3 presses down the entire preheating assembly 4. When the preheating assembly 4 drops to a corresponding height, the lower mold base 2 is then preheated to heat the mold cavity 201 and the annular heat storage cavity 202 outside the mold cavity 201. When the mold core 301 on the upper mold base 3 is pressed into the mold cavity 201 in the lower mold base 2, the annular heat storage cavity 202 can collect the previous hot air flow to avoid The preheating temperature of the front lower die seat 2 is suddenly reduced, thereby improving the comprehensiveness and stability of preheating and ensuring the quality of the shell after die-casting. The annular heat storage chamber 202 and the mold cavity 201 are connected through the conveying channel 205 therebetween, but the lifting mechanism 6 will block one end of the conveying channel 205 from the inside of the mold cavity 201 in the initial state, thereby preventing the air flow from entering the mold cavity 201 during the die-casting process, and also preventing the molten metal from flowing into the annular heat storage chamber 202. After the die-casting of the shell is completed, the upper die seat 3 moves up, and the lifting mechanism 6 lifts up the shell formed in the mold cavity 201. At this time, the originally blocked conveying channel 205 is opened, and the upward movement of the upper die seat 3 drives the annular opening and closing member 5 to descend and close, so that its role in the annular heat storage chamber 202 is transformed into a piston, and the annular opening and closing member 5 is used to press the gas in the annular heat storage chamber 202 into the mold cavity 201, so that the annular heat storage chamber 202 can not only store heat, but also cooperate with the annular opening and closing member 5 to improve the efficiency of demolding.

[0034] Compared with the prior art, the embodiment of the present invention can preheat the core 301 of the upper mold base 3 in advance during the downward pressing process of the upper mold base 3 by setting a preheating component 4 elastically connected between the lower mold base 2 and the upper mold base 3. At the same time, part of the heat enters the mold cavity 201 and the annular heat storage cavity 202 outside the mold cavity 201. The annular heat storage cavity 202 can collect part of the heat outside the mold cavity 201, allowing the lower mold base 2 to fully absorb the heat and fully preheat the lower mold base 2, thereby improving the comprehensiveness of the preheating. At the same time, the airflow in the annular heat storage cavity 202 can be recycled. During demolding, the lifting mechanism 6 lifts up the shell, and after a gap is generated between the bottom of the shell and the mold cavity 201, the airflow in the annular heat storage cavity 202 is pressed into the mold cavity 201. Under the pressure change, the shell can be demolded more quickly, and the heat in the annular heat storage cavity 202 will be quickly discharged, thereby improving the efficiency of shell cooling and molding.

[0035] In a further embodiment of the present invention, the preheating component 4 includes a heat-conducting pad 401, the heat-conducting pad 401 is located between the upper mold base 3 and the lower mold base 2, the limiting guide column 101 passes through the heat-conducting pad 401, a gas pipeline 402 is laid in the heat-conducting pad 401, the gas pipeline 402 is used to transmit combustible gas, and a plurality of flame nozzles 403 connected to the gas pipeline 402 are distributed in an annular array on the bottom surface of the heat-conducting pad 401, the flame nozzle 403 is located above the annular heat storage chamber 202, and the nozzle of the flame nozzle 403 is facing the mold core 301. Specifically, when the gas pipeline 402 is opened, the plurality of nozzles start to spray the flame nozzle 403 toward the mold core 301. Fire is used to preheat the mold core 301 from all directions, and as the upper mold base 3 rises and falls, the mold core 301 is heated more comprehensively. When the position of the thermal pad 401 is forced to drop, the hot air flow generated by the heating will also enter the mold cavity 201 and the annular heat storage cavity 202 in the lower mold base 2. When the upper mold squeezes the thermal pad 401 and the thermal pad 401 is about to contact the lower mold base 2, the flame nozzle 403 has also entered the annular heat storage cavity 202, and the preheating treatment of the lower mold base 2 is completed in the annular heat storage cavity 202. The annular heat storage cavity 202 surrounds the periphery of the mold cavity 201, which can ensure that the lower mold base 2 is fully preheated and improve the efficiency of workpiece forming.

[0036] In a further embodiment of the present invention, a plurality of top springs 405 are installed at the bottom of the thermal pad 401, and each top spring 405 is respectively matched and sleeved outside the limiting guide column 101, and a receiving groove 203 is opened on the top surface of the lower mold base 2. The bottom end of the top spring 405 abuts against the receiving groove 203, and the top end abuts against the bottom surface of the thermal pad 401. Specifically, when the upper mold base 3 moves up and does not contact the thermal pad 401, the top spring 405 will lift up the thermal pad 401 to prevent the thermal pad 401 from always resting on the lower mold under gravity. On the seat 2, when the upper die seat 3 is fully lifted, there is also room for movement between it and the thermal pad 401 to prevent the thermal pad 401 from always being in contact with the upper and lower molds during the preheating process, and to prevent cracks from occurring when the upper and lower molds are preheated. When the upper die seat 3 is pressed down to make the two sides of the thermal pad 401 fit with the upper die seat 3 and the lower die seat 2 respectively, the compressed top spring 405 is completely hidden in the accommodating groove 203, ensuring that the upper die seat 3 and the lower die seat 2 can fully die-cast the metal material.

[0037] In a further embodiment of the present invention, a shift block 404 for opening and closing the gas pipeline 402 is symmetrically elastically hinged on the top of the thermal pad 401. Specifically, when the shift block 404 is flipped and lifted, the gas pipeline 402 is in an open state, and when the shift block 404 is flipped and hidden in the thermal pad 401, the gas pipeline 402 is closed. The shift block 404 is hidden in the thermal pad 401 only after being squeezed by the upper die base 3, that is, when the upper die base 3 presses down on the thermal pad 401 so that the thermal pad 401 is about to contact the top surface of the lower die base 2, the shift block 404 will completely flip into the thermal pad 401, and close the gas pipeline 402 just before die casting. Because preheating treatment is no longer required during the die casting process, timely closing the gas pipeline 402 can reduce costs and save energy.

[0038] In a further embodiment of the present invention, a push switch is installed on the top of the frame 1 to abut against the upper die seat 3, and a valve connected to the push switch is installed on the gas pipeline 402. Specifically, when the upper die seat 3 is fully lifted, the push switch will be squeezed to close the gas pipeline 402, making it convenient to take out the die-cast workpiece.

[0039] In a further embodiment of the present invention, the annular opening and closing member 5 includes a piston ring 501 located in the annular heat storage chamber 202, the piston ring 501 contacts the inner wall of the annular heat storage chamber 202, a plurality of through holes 502 are vertically penetrated on the piston ring 501, a sealing ring 503 is rotatably connected to the bottom of the piston ring 501, the sealing ring 503 is connected to the piston ring 501 through a torsion spring (not shown in the figure), and a through groove 503 corresponding to the through hole 502 is opened on the sealing ring 503 04, both sides of the bottom of the piston ring 501 are rotatably connected with push-pull rods 505, the top of the push-pull rod 505 is fixedly connected with an adjusting gear 506, the bottom is transmission-connected with the upper die seat 3, the inner wall of the through groove 504 is provided with an arc-shaped rack 507 meshing with the adjusting gear 506, specifically, when the through groove 504 on the sealing ring 503 and the through hole 502 on the piston ring 501 correspond one by one, the cavity mouth of the annular heat storage cavity 202 is in an open state, and the preheating component 4 preheats the product The generated hot air flow will enter the annular heat storage chamber 202 along the through hole 502 to complete the preheating of the lower mold base 2. When the upper mold base 3 moves up, it will pull down the push-pull rod 505 and drive the push-pull rod 505 to rotate. The adjusting gear 506 on the push-pull rod 505 drives the sealing ring 503 to rotate at the bottom of the piston ring 501 until the through hole 502 on the piston ring 501 is covered by the sealing ring 503 to achieve closing. At this time, the piston ring 501 and the sealing ring 503 form a When the piston is forced to descend, the gas stored in the annular heat storage chamber 202 is pressed into the mold cavity 201. The annular opening and closing member 5 can be opened to allow the annular heat storage chamber 202 to be filled with hot air flow, thereby improving the mold preheating effect, and can be closed to allow the gas in the annular heat storage chamber 202 to be pressed into the mold cavity 201, thereby accelerating the demoulding efficiency. When the upper mold base 3 moves downward, it rotates and resets under the action of the torsion spring, and reopens the through hole 502 to allow the hot air flow to smoothly enter the annular heat storage chamber 202.

[0040] In a further embodiment of the present invention, transmission gears 7 are rotatably installed on both sides of the frame 1, and upper racks 701 and lower racks 702 respectively meshing with the two sides of the transmission gear 7 are slidably installed on the side walls of the frame 1. The upper rack 701 is fixedly connected to the upper die base 3, and the bottom of the lower rack 702 is fixedly connected to a push rod 703. The bottom end of the push-pull rod 505 passes through the push rod 703 and is fixedly connected to a sliding claw sleeve 508. The bottom of the push rod 703 is fixedly connected to a claw ring 704 that abuts against the sliding claw sleeve 508. Specifically, the upper die base 3 rises and falls with the upper racks 701 on both sides. When the upper rack 701 moves up, the lower rack 702 is lowered by driving the transmission gear 7 to rotate, forcing the lower rack 702 to move up. The push rod 703 is pressed down, allowing the claw ring 704 to gradually press against the staggered sliding claw sleeve 508. In the process of gradually pressing against each other, since the claw ring 704 itself is fixed on the push rod 703 and will not rotate, the sliding claw sleeve 508 will be forced to passively rotate to adapt to the sliding claw sleeve 508, thereby driving the push-pull rod 505 to rotate, and the adjusting gear 506 on the push-pull rod 505 drives the arc rack 507 to drive the entire sealing ring 503 to rotate, so that the sealing ring 503 blocks the through holes 502 on the piston ring 501. After the push rod 703 presses down the push-pull rod 505, the gas in the annular heat storage chamber 202 can be discharged into the mold cavity 201 under the extrusion of the piston ring 501 and the sealing ring 503.

[0041] In a further embodiment of the present invention, a return spring 509 is provided on the outer sleeve of the push-pull rod 505, and the return spring 509 is located in the annular heat storage chamber 202, one end of the return spring 509 is against the top of the push-pull rod 505, and the other end is against the bottom of the annular heat storage chamber 202. Specifically, when the upper mold base 3 descends and drives the push rod 703 to move upward, the claw ring 704 on the push rod 703 releases the sliding claw sleeve 508. At this time, the push-pull rod 505 is no longer limited by the claw ring 704 on the push rod 703. When the sealing ring 503 rotates and resets to open the through hole 502, the push-pull rod 505 is synchronously driven to rotate, so that the sliding claw sleeve 508 and the abutting claws on the claw ring 704 are offset again, and the piston ring 501 and the sealing ring 503 are lifted again under the action of the return spring 509, so as to realize repeated extrusion and discharge of the gas in the annular heat storage chamber 202 during continuous die casting.

[0042] In a further embodiment of the present invention, the lifting mechanism 6 includes a lifting frame 601 plugged into the bottom of the frame 1, and the bottom of the frame 1 is fixedly connected with a sleeve 102 for plugging the lifting frame 601. A push plate 602 is installed on the top of the lifting frame 601 inside the mold cavity 201. The thickness of the push plate 602 is greater than the diameter of the conveying channel 205. When the push plate 602 is located at the bottom of the mold cavity 201, it is sufficient to block the conveying channel 205. A lifting bracket 303 cooperating with the lifting frame 601 is slidably installed on the back of the upper mold base 3, and a slider is fixedly connected to the top of the lifting bracket 303. A sliding groove matching the slider is vertically opened on the back of the upper mold base 3. When the slider of the upper mold base 3 rises and presses against the bottom of the sliding groove, the lifting frame 601 is lifted by the lifting bracket 303. Specifically, when the upper mold base 3 moves up, the lifting bracket 303 first lifts the motor housing die-cast in the mold cavity 201 with the lifting frame 601, and then drives the support rod 703 to let the claw ring 704 press down the sliding claw sleeve 508 on the push-pull rod 505. While the lifting mechanism 6 lifts the workpiece, the annular opening and closing part 5 is used to squeeze the gas in the annular heat storage cavity 202 into the mold cavity 201, and the pressure is used to make the workpiece easier to demold.

[0043] In a further embodiment of the present invention, a baffle ring 406 is fixedly connected to the bottom of the thermal pad 401, and the baffle ring 406 is located above the annular heat storage chamber 202. The bottom of the baffle ring 406 is inserted into the annular heat storage chamber 202, and the outer wall of the baffle ring 406 is in contact with the inner wall of the annular heat storage chamber 202. Specifically, multiple flame nozzles 403 are surrounded by the baffle ring 406, so that when preheating the core 301, heat loss and waste are avoided to the greatest extent, and the hot air flow is surrounded, so that more heat is accumulated in the annular heat storage chamber 202 on the lower mold base 2.

[0044] In a further embodiment of the present invention, a plurality of air guide grooves 604 are provided on the outer peripheral surface of the push plate 602, and a sealing protrusion 204 matching the air guide grooves 604 is fixed on the inner wall of the mold cavity 201. Specifically, when the push plate 602 is located at the bottom of the mold cavity 201, each sealing protrusion 204 is respectively inserted into the plurality of air guide grooves 604 outside the push plate 602, and when the push plate 602 is lifted, the sealing protrusion 204 leaves the air guide groove 604. At this time, the air flow pressed from the annular heat storage cavity 202 will blow along the air guide grooves 604 toward the formed shell, so that the shell can be cooled in advance.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A preheating die-casting mold for a motor housing, comprising a frame (1) and a lower die base (2) and an upper die base (3) installed in the frame (1), characterized in that: Also includes: A preheating component (4) is elastically mounted between a lower die base (2) and an upper die base (3); a die core (301) penetrating the preheating component (4) is mounted at the bottom of the upper die base (3); a die cavity (201) and an annular heat storage cavity (202) located outside the die cavity (201) are provided on the lower die base (2); the two are connected, and an annular opening and closing member (5) is movably embedded in the annular heat storage cavity (202); A lifting mechanism (6), the top of which is cushioned on the bottom of the mold cavity (201) and blocks the connection between the mold cavity (201) and the annular heat storage cavity (202); When the upper mold base (3) moves upward, the lifting mechanism (6) is first lifted, and then the annular opening and closing member (5) is driven down, and the annular opening and closing member (5) is forced to close, so that the airflow in the annular heat storage cavity (202) is pressed into the mold cavity (201).

2. The preheating die-casting mold for a motor housing according to claim 1, characterized in that: The preheating assembly (4) comprises a heat-conducting pad (401), a gas pipeline (402) is laid inside the heat-conducting pad (401), and a plurality of flame spray nozzles (403) connected to the gas pipeline (402) are distributed in an annular array on the bottom surface of the heat-conducting pad (401), the flame spray nozzles (403) are located above the annular heat storage chamber (202), and the nozzles of the flame spray nozzles (403) face the mold core (301).

3. The preheating die-casting mold for a motor housing according to claim 2, characterized in that: A plurality of top springs (405) are installed at the bottom of the thermally conductive pad (401), a receiving groove (203) is provided on the top surface of the lower mold base (2), the bottom end of the top spring (405) abuts against the receiving groove (203), and the top end abuts against the bottom surface of the thermally conductive pad (401).

4. The preheating die-casting mold for a motor housing according to claim 2, characterized in that: A shifting block (404) for opening and closing the gas transmission pipeline (402) is elastically hinged on the top of the heat-conducting pad (401).

5. The preheating die-casting mold for a motor housing according to claim 1, characterized in that: The annular opening and closing member (5) comprises a piston ring (501) located in the annular heat storage chamber (202), the piston ring (501) having a plurality of through holes (502) vertically extending therethrough, a sealing ring (503) being rotatably connected to the bottom of the piston ring (501), a through groove (504) corresponding to the through hole (502) being provided on the sealing ring (503), push-pull rods (505) being rotatably connected to both sides of the bottom of the piston ring (501), an adjusting gear (506) being fixedly connected to the top of the push-pull rod (505), and a transmission connection being made with the upper die seat (3) at the bottom, and an arc-shaped rack (507) meshing with the adjusting gear (506) being provided on the inner wall of the through groove (504).

6. The preheating die-casting mold for a motor housing according to claim 5, characterized in that: Transmission gears (7) are rotatably mounted on both sides of the frame (1); an upper rack (701) and a lower rack (702) respectively meshing with the two sides of the transmission gear (7) are slidably mounted on the side walls of the frame (1); the upper rack (701) is fixedly connected to the upper die base (3); a support rod (703) is fixedly connected to the bottom of the lower rack (702); the bottom end of the push-pull rod (505) passes through the support rod (703) and is fixedly connected to a sliding claw sleeve (508); and a claw ring (704) that abuts against the sliding claw sleeve (508) is fixedly connected to the bottom of the support rod (703).

7. The preheating die-casting mold for a motor housing according to claim 6, characterized in that: The outer sleeve of the push-pull rod (505) is provided with a return spring (509), and the return spring (509) is located in the annular heat storage chamber (202).

8. The preheating die-casting mold for a motor housing according to claim 1, characterized in that: The lifting mechanism (6) comprises a lifting frame (601) plugged into the bottom of the frame (1); a material pushing plate (602) is installed on the top of the lifting frame (601) inside the mold cavity (201); a lifting bracket (303) matching the lifting frame (601) is slidably installed on the back of the upper mold base (3); when the upper mold base (3) rises, the lifting frame (601) is lifted by the lifting bracket (303).

9. The preheating die-casting mold for a motor housing according to claim 2, characterized in that: A baffle ring (406) is fixedly connected to the bottom of the heat-conducting pad (401), and the baffle ring (406) is located above the annular heat storage cavity (202).

10. The preheating die-casting mold for a motor housing according to claim 8, characterized in that: The outer peripheral surface of the push plate (602) is provided with a plurality of air guide grooves (604), and the inner wall of the mold cavity (201) is fixed with a sealing protrusion (204) matching the air guide grooves (604).

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