Heat treatment device and heat treatment method for aluminum alloy die-cast parts

Abstract

The present invention relates to the technical field of sand mold machining. Disclosed are a heat treatment device and heat treatment method for aluminum alloy die-cast parts. The heat treatment device comprises a frame, with at least two sand boxes placed on a workbench thereof, and further comprises: a pressing plate arranged corresponding to discharging boxes and capable of moving in the vertical direction of the frame; a compacting assembly arranged on the pressing plate and used for leveling and compacting sand molds; and a transmission assembly arranged on the pressing plate and used for driving the compacting assembly to move on the pressing plate. When sand materials are poured into the discharging boxes, the transmission assembly is driven, so that the transmission assembly moves the compacting assembly to level and compact the sand molds. According to the heat treatment device for aluminum alloy die-cast parts provided by the present invention, the compacting assembly is driven by the transmission assembly to move in box bodies, so that the compacting assembly levels the sand materials in the sand boxes, achieving leveling and compacting of the sand materials in the box bodies while feeding.

Description

A heat treatment device and heat treatment method for aluminum alloy die castings Technical Field

[0001] The present invention relates to the technical field of sand mold processing, and in particular to a heat treatment device and a heat treatment method for aluminum alloy die castings. Background Art

[0002] Sand casting is commonly used in the casting of mountain bike wheel hubs. In the invention patent application, entitled "A Sand Mold Processing Device for Hollow Castings," with publication number CN106623813A and publication date May 10, 2017, the invention discloses a sand box, an upper mold, a lower mold, a first cylinder for controlling the upper mold's elevation, a second cylinder for controlling the lower mold's opening and closing, a sand mold transfer plate, a third cylinder for controlling the sand mold transfer plate's rotation, and a fourth cylinder for controlling the sand mold transfer plate's extension and retraction. The sand box includes a sand inlet pipe vertically positioned in the center, compressed air inlets on the side walls, and a sand inlet port connected to the sand inlet pipe at the top. The first cylinder is secured to the top of the sand box via a door-shaped bracket, and a support rod and connecting plate are used to control the upper mold's elevation. When the upper and lower molds are closed, a sand mold cavity is formed. The fourth cylinder is secured to the guide rod of the third cylinder. The invention not only enables automated sand mold processing and improves the compactness of the sand mold, but also ensures the integrity of the sand mold structure and enhances transfer efficiency.

[0003] In the prior art including the above-mentioned patent, generally, casting sand is poured into the sand mold, and then the sand mold is compacted using a jack. However, after compaction, the sand surface of the sand mold in the sand box will inevitably be lower than the height of the sand box, and it is necessary to pour sand into the sand box again and compact it. This reciprocating operation makes the steps in the sand mold making process more cumbersome.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a heat treatment device and a heat treatment method for aluminum alloy die castings to solve the above-mentioned deficiencies in the prior art.

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

[0007] A heat treatment device for aluminum alloy die castings, comprising a frame, a workbench of the frame having at least two flasks placed thereon, and further comprising: a lower pressing plate, which is arranged corresponding to the discharge box and moves on the vertical square box of the frame;

[0008] Compacting assembly: It is set on the lower platen and is used to level and compact the sand mold;

[0009] Transmission assembly: It is set on the lower pressing plate and is used to drive the compaction assembly to move on the lower pressing plate;

[0010] When the sand material is poured into the discharge box, the transmission component is driven, so that the transmission component drives the compacting component to level and compact the sand mold.

[0011] Preferably, a feed port is separately provided on the lower pressure plate at a position corresponding to each sand box.

[0012] Preferably, the compacting assembly includes a plurality of pressing plates slidably connected to the lower pressing plate, with two pressing plates being arranged as a group.

[0013] Preferably, the transmission assembly includes a first transmission unit and a second transmission unit, the first transmission unit is connected to the second transmission unit, and the first transmission unit is used to drive each group of pressing plates to slide on the lower pressing plate.

[0014] Preferably, the first transmission unit includes a plurality of gears rotatably connected to the lower pressure plate and a plurality of racks slidably connected to the lower pressure plate, each of the gears is respectively engaged with two racks, and each rack is fixedly connected to a pressing plate.

[0015] Preferably, a one-way transmission member is coaxially arranged on each of the gears, and the one-way transmission member includes a transmission shaft coaxially arranged with the gear, and a plurality of wedge blocks are slidably connected to the transmission shaft in the radial direction, and each wedge block is connected to the transmission shaft by a second spring, and a ratchet groove adapted to each wedge block is provided on the end face of the gear.

[0016] Preferably, the second transmission unit includes a spreading platform slidably connected to each feed port position and a transmission shaft coaxially arranged with the bulking platform, and each spreading platform is connected to its corresponding feed port via a third spring.

[0017] Preferably, a sleeve is coaxially fixedly connected to the transmission shaft, a plurality of connecting pins are fixedly connected around the inner wall of the sleeve, a connecting shaft is coaxially fixedly connected to the spreading table, and a wave groove is opened around the outer periphery of the connecting shaft to match the connecting pins.

[0018] Preferably, each of the racks is connected to the lower pressure plate via a first spring.

[0019] A heat treatment method for aluminum alloy die castings, which is processed using the above-mentioned heat treatment device for die castings, comprises the following specific steps:

[0020] S1. Making a mold, wherein the mold is made of non-magnetic material and placing the mold in a sand box;

[0021] S2. Mixing 100 parts by weight of metal sand and 2 to 4 parts by weight of a phosphate binder to obtain molding sand;

[0022] S3, using the heat treatment device for the aluminum alloy die casting to fill the box with molding sand to form a casting mold;

[0023] S4, setting gate, riser, and closing the box;

[0024] S5. Pour molten aluminum alloy into the sand mold through the gate, and wait for the mold liquid to cool and form;

[0025] S6. Remove the sand box, crush the sand mold and take out the mold.

[0026] In the above technical solution, the present invention provides a heat treatment device for aluminum alloy die-castings, which drives the compaction component to move in the box through the transmission component, so that the compaction component levels the sand in the sand box, thereby achieving leveling and compacting of the sand in the box while feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] FIG1 is a schematic diagram of the overall structure of a heat treatment apparatus for aluminum alloy die castings provided in an embodiment of the present invention;

[0029] FIG2 is a schematic structural diagram of a male mold provided in an embodiment of the present invention;

[0030] FIG3 is a schematic diagram of the installation structure of a gear provided in an embodiment of the present invention;

[0031] FIG4 is an enlarged schematic diagram of the structure at point B in FIG3 provided by an embodiment of the present invention;

[0032] FIG5 is a schematic diagram of the installation structure of the spreading table provided in an embodiment of the present invention;

[0033] FIG6 is an enlarged schematic diagram of the structure at point A in FIG4 according to an embodiment of the present invention;

[0034] FIG7 is a schematic diagram of the installation structure of the connecting pin provided in an embodiment of the present invention;

[0035] FIG8 is a schematic structural diagram of a wave trough provided in an embodiment of the present invention;

[0036] FIG9 is a schematic structural diagram of a gear provided in an embodiment of the present invention.

[0037] Explanation of the accompanying drawings: 1. Frame; 1.1. Discharge box; 1.2. Punch; 1.20. Sand box; 1.3. Lower pressure plate; 1.30. Feed port; 1.300. Slide; 1.301. First spring; 1.303. Circular groove; 1.31. Solenoid valve; 1.32. Rack; 1.320. Pressing plate; 1.322. Slider; 1.33. Gear; 1.330. Ratchet groove; 1.332. Connecting column; 1.34. Transmission shaft; 1.340. Mounting groove; 1.341. Second spring; 1.342. Wedge block; 1.343. Sleeve; 1.3430. Connecting pin; 1.35. Spreading table; 1.350. Third spring; 1.351. Connecting shaft; 1.3510. Wave groove; 1.4. Bellows. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] 1-9 , the present invention provides a heat treatment device for aluminum alloy die castings, comprising a frame 1, at least two flasks 1.20 placed on a workbench of the frame 1, and further comprising: a lower pressing plate 1.3: which is arranged corresponding to the discharge box 1.1 and moves on the vertical square box of the frame 1;

[0040] Compacting assembly: It is set on the lower pressing plate 1.3 and is used to level and compact the sand mold;

[0041] Transmission assembly: It is arranged on the lower pressing plate 1.3 and is used to drive the compaction assembly to move on the lower pressing plate 1.3;

[0042] When the sand material is poured into the discharge box 1.1, the transmission component is driven, so that the transmission component drives the compacting component to level and compact the sand mold.

[0043] Specifically, as shown in Figure 1, at least two discharge boxes 1.1 are fixedly installed on the top of the frame 1, and the discharge boxes 1.1 are connected to the feed ports 1.30 on the lower pressure plate 1.3 through a bellows 1.4, so that the lower pressure plate 1.3 can move in the vertical direction of the frame 1. A feed port 1.30 is separately provided at the position corresponding to each sand box 1.20 on the lower pressure plate 1.3, and a solenoid valve 1.31 is provided between each discharge port and the bellows 1.4. The opening and closing of each discharge port is controlled by the solenoid valve 1.31, and the lower pressure plate 1.3 and the frame 1 are connected by a hydraulic rod, which is a hydraulic The pressure rod drives the lower pressure plate 1.3 to move in the vertical direction of the frame 1. In this embodiment, the hydraulic rod and the solenoid valves 1.31 are controlled by PLC. The solenoid valves 1.31 can be opened or closed at the same time through PLC control. A weighing sensor is embedded in the work surface of the frame 1. The model of the weighing sensor can be selected according to the installation and manufacturing conditions on site. A sensor is provided on the work surface of the frame 1 to detect the quality of the sand material in the sand box 1.20. When the weight of the sand material in the sand box 1.20 reaches the preset weight, the PLC controls the solenoid valves 1.31 to close.

[0044] As shown in Figures 1 and 2, at least two sand boxes 1.20 are placed on the workbench of the frame 1. The upper and lower ends of each sand box 1.20 are connected through, and a punch 1.2 is provided at the bottom of the sand box 1.20. Sand is injected into the sand box 1.20 and then the sand is compacted and leveled to form a mold cavity at the position of the punch 1.2. Then, gates are opened on the two sand boxes 1.20 and the mold is combined for pouring.

[0045] Compacting assembly: It is arranged on the lower pressing plate 1.3. The compacting assembly slides in each sand box 1.20 or applies a downward force during the sliding process or generates vibration during the movement to level and compact the sand.

[0046] Transmission assembly: It is arranged on the lower pressure plate 1.3 and is used to drive the compaction assembly to move on the lower pressure plate 1.3; the transmission assembly converts the upper linear motion in the vertical direction into linear motion in the horizontal direction. In the prior art, the mechanisms that can convert the linear motion in the vertical direction into circular motion include gear 1.33 rack 1.32 transmission mechanism, crank rocker mechanism or other mechanisms that can convert the linear motion in the vertical direction into circular motion. The transmission assembly drives the transmission assembly to move in the middle and lower parts of the material when the material falls in during the opening of each solenoid valve 1.31, and then the transmission assembly drives the compaction assembly to slide in the sand box 1.20 or exert a downward force during the sliding process or generate vibration during the movement to achieve leveling and compacting of the sand.

[0047] During use, after the user assembles the sand box 1.20 and the punch 1.2, they are placed at the corresponding position of the lower pressure plate 1.3. At this time, the hydraulic rod drives the lower pressure plate 1.3 to move downward until the lower pressure plate 1.3 moves to the position flush with the sand box 1.20 or extends into the sand box 1.20. At this time, the solenoid valves 1.31 are opened, so that the sand in the storage box falls into the sand box 1.20, and the transmission assembly is driven to move under the action of the gravity of the sand, so that the transmission assembly drives the compaction assembly to slide in the sand box 1.20 or applies a downward force during the sliding process or generates vibration during the movement to achieve leveling and compacting of the sand.

[0048] 3-4 , in another embodiment of the present invention, the compacting assembly includes a plurality of pressing plates 1.320 slidably connected to the lower pressing plate 1.3, with two pressing plates 1.320 forming a group.

[0049] Each rack 1.32 is connected to the lower pressure plate 1.3 via a first spring 1.301.

[0050] Specifically, a slide groove 1.300 is provided on both opposite sides of the bottom end of the lower pressure plate 1.3, and a first spring 1.301 is fixedly connected in each slide groove 1.300, and a rack 1.32 is slidably connected in each slide groove 1.300. The bottom end of each rack 1.32 is fixedly connected with a slider 1.322 adapted to the slide groove 1.300, and the other end of each first spring 1.301 is fixedly installed on the corresponding slider 1.322. A pressing plate 1.320 is fixedly connected to each rack 1.32, and the sand in the sand box 1.20 is compacted and leveled by sliding each pressing plate 1.320 in the box body.

[0051] 3-6 , in another embodiment of the present invention, the transmission assembly includes a first transmission unit and a second transmission unit, the first transmission unit is connected to the second transmission unit, and the first transmission unit is used to drive each group of pressing plates 1.320 to slide on the lower pressing plate 1.3.

[0052] Among them, the first transmission unit includes a plurality of gears 1.33 rotatably connected to the lower pressure plate 1.3 and a plurality of racks 1.32 slidably connected to the lower pressure plate 1.3, each gear 1.33 is respectively engaged with two racks 1.32, and each rack 1.32 is fixedly connected to a pressing plate 1.320.

[0053] A one-way transmission member is coaxially arranged on each gear 1.33, and the one-way transmission member includes a transmission shaft 1.34 arranged coaxially with the gear 1.33. A plurality of wedge blocks 1.342 are slidably connected to the transmission shaft 1.34 in the radial direction. Each wedge block 1.342 is connected to the transmission shaft 1.34 by a second spring 1.341. A ratchet groove 1.330 adapted to each wedge block 1.342 is formed on the end face of the gear 1.33.

[0054] The second transmission unit includes a spreading table 1.35 slidably connected to each feed port 1.30 and a transmission shaft 1.34 coaxially arranged with the material spreading table. Each spreading table 1.35 is connected to its corresponding feed port 1.30 via a third spring 1.350.

[0055] A sleeve 1.343 is coaxially fixedly connected to the transmission shaft 1.34, and a plurality of connecting pins 1.3430 are fixedly connected around the inner wall of the sleeve 1.343. A connecting shaft 1.351 is coaxially fixedly connected to the spreading platform 1.35, and a wave groove 1.3510 is opened around the outer circumference of the connecting shaft 1.351 to match the connecting pins 1.3430.

[0056] Specifically, as shown in Figure 6, each feed port 1.30 of the lower pressure plate 1.3 is coaxially connected to a gear 1.33, and a plurality of connecting columns 1.332 are fixedly connected around one end face of each gear 1.33. The lower pressure plate 1.3 is provided with a circular groove 1.303 adapted to the connecting column 1.332 at the position of each discharge port, so that each gear 1.33 is coaxially arranged with each discharge port, and a rack 1.32 is engaged on both opposite sides of each gear 1.33.

[0057] The lower pressure plate 1.3 is located inside each discharge port and is fixedly connected to a hollow frame, and a spreading platform 1.35 is coaxially slidably connected inside the hollow frame. The spreading platform 1.35 is a conical structure, and a plurality of arc-shaped partitions are fixedly connected around the circumference of the spreading platform 1.35. As shown in Figure 8, the spreading platform 1.35 is fixedly connected to a boss at one end away from the connecting shaft 1.351, and the circumference of the boss has a key. A through hole is provided at the axial center position of each gear 1.33, and the inner diameter of each through hole is larger than the circumference of any end face of the conical table. The spreading platform 1.35 and the hollow frame are connected by a third spring 1.350, and a keyway is provided on the hollow frame to match the key on the circumference of the boss, so that the spreading platform 1.35 can move in the vertical direction without rotating. As shown in Figure 7, the bottom end of the spreading platform 1.35 is coaxially fixedly connected to a connecting shaft 1.351, and the outer circumference of the connecting shaft 1.351 A plurality of wave grooves 1.3510 are provided around the gear shaft 1.34, and a transmission shaft 1.34 is coaxially sleeved on the spreading platform 1.35. The transmission shaft 1.34 has a sleeve 1.343 that is compatible with the connecting shaft 1.351. A plurality of connecting pins 1.3430 are fixedly connected around the inner wall of the sleeve 1.343. Each connecting pin 1.3430 is arranged in a one-to-one correspondence in the wave groove 1.3510. A plurality of mounting grooves 1.340 are provided in the radial direction of the transmission shaft 1.34. A second spring 1.341 is fixedly connected in each mounting groove 1.340, and a wedge block 1.342 that is compatible with it is slidably connected to the inner side of each mounting groove 1.340. The other end of each second spring 1.341 is fixedly mounted on the corresponding wedge block 1.342. A ratchet groove 1.330 is provided on the end face of the gear 1.33, and each wedge block 1.342 is located in the corresponding ratchet groove 1.330.

[0058] During use, after the user assembles the sand box 1.20 and the punch 1.2, they are placed at the corresponding position of the lower pressure plate 1.3. At this time, the hydraulic rod drives the lower pressure plate 1.3 to move downward until the lower pressure plate 1.3 moves to the position flush with the sand box 1.20 or extends into the sand box 1.20. At this time, each solenoid valve 1.31 opens, so that the sand in the storage box falls into the sand box 1.20, and the spreading platform 1.35 is driven downward by the gravity of the sand, thereby compressing the third spring 1.350 during the downward movement of the spreading platform 1.35, so that The wave groove 1.3510 on the connecting shaft 1.351 of the spreading platform 1.35 interacts with the connecting pin 1.3430 in the sleeve 1.343. After the third spring 1.350 is compressed to the maximum deformation, it has a reset process. Therefore, during the reciprocating movement of the spreading platform 1.35, the discharge ports are in an open and closed state and drive the transmission shaft 1.34 to move, and then the transmission shaft 1.34 and the gear 1.33 drive the gear 1.33 to rotate, so that each gear 1.33 drives the racks 1.32 meshing with it to move, so that each rack 1 .32 compresses the first spring 1.301 during the movement process, thereby causing each rack 1.32 to drive the pressing plate 1.320 to level and compact the sand mold. When each first spring 1.301 is compressed to the maximum deformation, the weighing sensor detects that the weight in the sand box 1.20 reaches a preset gradient. For example, the mass in the sand box 1.20 increases by 5KG (the value can be measured based on the time when the first spring 1.301 is compressed to the maximum deformation). That is, when the mass in the sand box 1.20 increases by the preset value, the first spring 1.301 is compressed to the maximum deformation. When measuring, each solenoid valve is in a closed state and the connecting shaft 1.351 is in a stationary state, so that the first spring 1.301 is compressed to the maximum deformation. At this time, the first spring 1.301 drives each rack 1.32 to reset, and then the gear 1.33 is reversed, so that each wedge block 1.342 interacts with the ratchet groove 1.330, extends into the installation inner compression spring, and then realizes leveling and compacting the sand mold. When the first spring 1.301 returns to its original length, the solenoid valve is opened, and this reciprocating cycle is repeated until the sand in the sand box is filled.

[0059] A heat treatment method for aluminum alloy die castings, which is processed using the above-mentioned heat treatment device for die castings, comprises the following specific steps:

[0060] S1. Make a mold, which is made of non-magnetic material and place it in a sand box 1.20;

[0061] S2. Mixing 100 parts by weight of metal sand and 2 to 4 parts by weight of a phosphate binder to obtain molding sand;

[0062] S3, using the heat treatment device for the aluminum alloy die casting to fill the box with molding sand to form a casting mold;

[0063] S4, setting gate, riser, and closing the box;

[0064] S5. Pour molten aluminum alloy into the sand mold through the gate, and wait for the mold liquid to cool and form;

[0065] S6. Remove the sand box 1.20, crush the sand mold, and take out the mold.

[0066] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A heat treatment device for aluminum alloy die castings, comprising a frame (1), at least two flasks (1.20) being placed on a workbench of the frame (1), characterized in that: Also includes: Lower pressing plate (1.3): it is arranged corresponding to the material discharge box (1.1), and the lower pressing plate (1.3) moves on the vertical square box of the frame (1); Compacting assembly: It is arranged on the lower pressing plate (1.3) and is used to level and compact the sand mold; Transmission assembly: it is arranged on the lower pressing plate (1.3) and is used to drive the compaction assembly to move on the lower pressing plate (1.3); When the sand material is poured into the discharge box (1.1), the transmission component is driven, so that the transmission component drives the compaction component to level and compact the sand mold.

2. The heat treatment device for aluminum alloy die casting according to claim 1, characterized in that: A feed port (1.30) is separately arranged on the lower pressure plate (1.3) at a position corresponding to each sand box (1.20).

3. The heat treatment device for aluminum alloy die casting according to claim 2, characterized in that: The compacting assembly comprises a plurality of pressing plates (1.320) slidably connected to the lower pressing plate (1.3), wherein two pressing plates (1.320) are arranged as a group.

4. The heat treatment device for aluminum alloy die casting according to claim 3, characterized in that: The transmission assembly comprises a first transmission unit and a second transmission unit, the first transmission unit being connected to the second transmission unit, and the first transmission unit being used to drive each group of pressing plates (1.320) to slide on the lower pressing plate (1.3).

5. The heat treatment device for aluminum alloy die casting according to claim 3, characterized in that: The first transmission unit comprises a plurality of gears (1.33) rotatably connected to the lower pressing plate (1.3) and a plurality of racks (1.32) slidably connected to the lower pressing plate (1.3); each of the gears (1.33) is respectively meshed with two racks (1.32), and each rack (1.32) is respectively fixedly connected to a pressing plate (1.320).

6. The heat treatment device for aluminum alloy die casting according to claim 5, characterized in that: A one-way transmission member is coaxially arranged on each of the gears (1.33), and the one-way transmission member comprises a transmission shaft (1.34) coaxially arranged with the gear (1.33). A plurality of wedge blocks (1.342) are slidably connected to the transmission shaft (1.34) in a radial direction, and each wedge block (1.342) is connected to the transmission shaft (1.34) via a second spring (1.341). A ratchet groove (1.330) adapted to each wedge block (1.342) is provided on the end surface of the gear (1.33).

7. The heat treatment device for aluminum alloy die casting according to claim 6, characterized in that: The second transmission unit comprises a material spreading table (1.35) slidably connected at the position of each feed port (1.30) and a transmission shaft (1.34) coaxially arranged with the material spreading table, and each material spreading table (1.35) is connected to the corresponding feed port (1.30) via a third spring (1.350).

8. The heat treatment device for aluminum alloy die casting according to claim 7, characterized in that: A sleeve (1.343) is coaxially fixedly connected to the transmission shaft (1.34), a plurality of connecting pins (1.3430) are fixedly connected around the inner wall of the sleeve (1.343), a connecting shaft (1.351) is coaxially fixedly connected to the spreading platform (1.35), and a wave groove (1.3510) matching the connecting pins (1.3430) is formed around the outer circumference of the connecting shaft (1.351).

9. The heat treatment device for aluminum alloy die casting according to claim 5, characterized in that: Each of the racks (1.32) is connected to the lower pressing plate (1.3) via a first spring (1.301).

10. A method for heat treatment of aluminum alloy die castings, which is processed by using a heat treatment device for aluminum alloy die castings according to any one of claims 1 to 9, characterized in that: The method comprises the following specific steps: S1. Making a mold, wherein the mold is made of a non-magnetic material, and placing the mold in a sand box (1.20); S2, mixing 100 parts by weight of metal sand and 2 to 4 parts by weight of phosphate binder to obtain molding sand; S3, using the heat treatment device for the aluminum alloy die casting to fill the molding sand into a full box to form a casting mold; S4, setting gates, risers, and closing the box; S5, injecting molten aluminum alloy into the sand mold through the gate, and waiting for the mold liquid to cool and form; S6. Remove the sand box (1.20), crush the sand mold and take out the mold.

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