Lightweight aluminum alloy die-casting die

Abstract

The invention relates to the technical field of die-casting dies, in particular to a lightweight aluminum alloy die-casting die which comprises a cavity die, an extrusion die, an edge cutting assembly and an abutting assembly. The cavity die is located below the extrusion die, the extrusion die is matched with the cavity die, the edge cutting assembly is located at the edge of the bottom face of the extrusion die, and the abutting assembly is located at the edge of the top face of the cavity die; when the extrusion die and the cavity die are subjected to extrusion forming, the edge cutting assembly descends along with the extrusion die until the edge cutting assembly makes contact with the abutting assembly, and edge cutting, stripping and shaping are completed. Along with further descending of the extrusion die, the edge cutting assembly can further disassemble and separate the cut edge materials, the edge cutting assembly is matched with further downward pressing of the extrusion die, the edges of the die castings can be corrected and shaped, and it is ensured that the edges of the cut die castings are consistent in thickness and full in thickness.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting dies, and in particular to a lightweight aluminum alloy die-casting die. Background Art

[0002] Die casting molds are tools for casting metal parts, usually tools used to complete the die casting process on a dedicated die forging machine. The basic process of die casting is: the molten metal is first cast into the mold cavity at a low or high speed. The mold has a movable cavity surface, which is pressurized and forged as the molten metal cools, eliminating the shrinkage defects of the blank and making the internal structure of the blank reach the broken grains of the forged state.

[0003] During the die casting process, as the extrusion die descends, the aluminum alloy in the molten state is compressed and deformed. Flash is produced when the aluminum alloy is compressed and deformed. The usual treatment method is to manually shear with tools such as shears, but this can only be done after the die casting has cooled down. It is not only time-consuming, but also the quality of the workpiece is unstable due to manual operation. Summary of the invention

[0004] The present invention aims at the deficiencies in the prior art and provides the following technical solutions:

[0005] Lightweight aluminum alloy die-casting mold, including: cavity mold, extrusion mold, trimming assembly and resistance assembly;

[0006] The cavity mold is located below the extrusion mold, and the extrusion mold is adapted to the cavity mold, the trimming assembly is located at the bottom edge of the extrusion mold, and the abutment assembly is located at the top edge of the cavity mold;

[0007] When the extrusion die and the cavity die are extruding and forming, the trimming component descends with the extrusion die until it contacts the abutment component, thereby completing trimming, stripping and shaping.

[0008] As an improvement of the above technical solution, the trimming assembly at least comprises: a first abutment ring and an annular cutter;

[0009] An annular cavity is provided inside the abutment ring, a notch connected to the cavity is provided at a location corresponding to the cavity on the bottom surface of the abutment ring, the top end of the annular cutter is located in the cavity and slidably cooperates with the cavity, and the bottom end of the annular cutter extends out of the notch.

[0010] As an improvement of the above technical solution, a plurality of cutting knives are evenly distributed in a ring shape on the circumferential outer wall of the annular cutter, the top end of the cutting knives is located in cavity one, and the bottom end of the cutting knives extends out of the slot and is flush with the bottom surface of the annular cutter.

[0011] As an improvement of the above technical solution, the trimming assembly further includes: a stripping slider and a reset rod;

[0012] A plurality of cavities 2 are evenly opened on the circumferential outer wall of the abutment ring 1, the top of the cavity 1 is connected with the cavity 2, the stripping slider is slidably arranged in the cavity 2, and is connected with the inner wall of the cavity 2 through the reset rod.

[0013] As an improvement of the above technical solution, the top surface of the second cavity is provided with a slide rail, and the stripping slide block is slidably connected with the second cavity via the slide rail;

[0014] One end of the reset pull rod is fixed to the inner wall of the second cavity corresponding to the opening, and the other end extends into the stripping slider to be fixed thereto, and the reset pull rod extending into the stripping slider is clearance-matched with the stripping slider.

[0015] As an improvement of the above technical solution, the bottom surface of the stripping slider is an inclined surface, the top of the annular cutter corresponding to the stripping slider slides in cooperation with the bottom surface of the stripping slider, and the bottom end of the stripping slider extending out of cavity 2 is higher than the bottom surface of the annular cutter.

[0016] As an improvement of the above technical solution, the abutment assembly at least includes: a second abutment ring and a top plate;

[0017] The top surface of the second abutment ring is provided with an annularly structured air avoidance groove corresponding to the notch position, and a plurality of reset push rods are evenly distributed in the air avoidance groove. The top plate is arranged at the opening of the air avoidance groove, and the bottom surface is connected to the reset push rod. In normal state, the top surface of the top plate is flush with the top surface of the second abutment ring.

[0018] As an improvement of the above technical solution, when the extrusion die and the cavity die are extruded into place, the bottom surface of the annular cutter contacts the top surface of the top plate, and the bottom end of the annular cutter extends into the air avoidance groove.

[0019] Beneficial effects of the present invention:

[0020] As the die-casting proceeds, flash will appear on the die-casting, that is, part of the aluminum alloy overflows from between the trimming assembly and the abutment assembly, thus forming irregular "skirts" at the edge of the die-casting. These "skirts" are cut off by the trimming assembly when the extrusion die and the cavity die are closed, and as the extrusion die is further lowered, the trimming assembly can also disassemble and release the cut edge material, and the trimming assembly can also correct and shape the edge of the die-casting in conjunction with the further downward pressure of the extrusion die to ensure that the thickness of the edge of the die-casting being trimmed is consistent and the edge thickness is full.

[0021] When the annular cutter moves downward with the extrusion die and gradually acts on the flash, the annular cutter is forced to retract into cavity 1, which causes the top of the annular cutter to be squeezed with the bottom surface of the stripping slider, so that the stripping slider can be ejected.

[0022] When the stripper slide is pushed out, the bottom end gradually extends out of cavity 2 until the bottom end acts on the flash. When the force of the stripper slide on the flash and the force of the annular cutter on the stripper slide reach a balance, as the annular cutter further cuts the flash, the stripper slide can also push the flash out of the mold.

[0023] When the annular cutter completely cuts off the flash, the reset rod pulls the stripping slider back into cavity two. At this time, the stripping slider acts on the annular cutter, causing the annular cutter to be pushed out of cavity one, thus completing the reset of the annular cutter so that the flash can be cut during the next mold closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the mold closing state of a lightweight aluminum alloy die-casting mold;

[0025] Figure 2 This is a three-dimensional diagram of the lightweight aluminum alloy die-casting mold after assembly;

[0026] Figure 3 It is a bottom view of the trimming component in the lightweight aluminum alloy die-casting mold;

[0027] Figure 4 A three-dimensional diagram of the trimming components in a lightweight aluminum alloy die-casting mold;

[0028] Figure 5 This is a structural diagram of the connection between cavity one and cavity two in a lightweight aluminum alloy die-casting mold;

[0029] Figure 6 This is a diagram showing the matching relationship between the annular cutter and the stripping slider in a lightweight aluminum alloy die-casting mold;

[0030] Figure 7 A top view of the interference components in a lightweight aluminum alloy die-casting mold;

[0031] Figure 8 This is a diagram of the internal structure of the second resistance ring in the lightweight aluminum alloy die-casting mold.

[0032] : 100, cavity mold; 200, extrusion mold; 300, trimming assembly; 310, resistance ring one; 311, cavity one; 312, notch; 313, cavity two; 314, slide rail; 320, annular cutter; 330, cutting knife; 340, stripping slider; 350, reset rod; 400, resistance assembly; 410, resistance ring two; 420, top plate; 411, air avoidance groove; 412, reset push rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] In the existing die-casting process, as the extrusion die descends, the aluminum alloy in the molten state is compressed and deformed. Flash is generated when the aluminum alloy is compressed and deformed. The usual treatment method is to manually shear with tools such as shears, but this can only be done after the die-casting has cooled down. It is not only time-consuming, but also the quality of the workpiece is unstable due to manual operation.

[0035] See attached Figure 1-8 As shown, Figure 1 This is a schematic diagram of the mold closing state of a lightweight aluminum alloy die-casting mold; Figure 2 This is a three-dimensional diagram of the lightweight aluminum alloy die-casting mold after assembly; Figure 3 It is a bottom view of the trimming component in the lightweight aluminum alloy die-casting mold; Figure 4 A three-dimensional diagram of the trimming components in a lightweight aluminum alloy die-casting mold; Figure 5 This is a structural diagram of the connection between cavity one and cavity two in a lightweight aluminum alloy die-casting mold; Figure 6 This is a diagram showing the matching relationship between the annular cutter and the stripping slider in a lightweight aluminum alloy die-casting mold; Figure 7 A top view of the interference components in a lightweight aluminum alloy die-casting mold; Figure 8 This is a diagram of the internal structure of the second resistance ring in the lightweight aluminum alloy die-casting mold.

[0036] In order to solve the above technical problems, a lightweight aluminum alloy die-casting mold is provided, including: a cavity mold 100, an extrusion mold 200, a trimming assembly 300 and an abutment assembly 400.

[0037] Among them, the cavity mold 100 is located below the extrusion mold 200. During die-casting, the cavity mold 100 and the extrusion mold 200 must be preheated first. When the set temperature is reached, the molten aluminum alloy is introduced into the cavity mold 100. Then the extrusion mold 200 descends to die-cast the aluminum alloy in the molten state in the cavity mold 100, and then the die-casting is obtained after cooling and demolding.

[0038] In order to realize the preheating and cooling of the cavity mold 100 and the extrusion mold 200, in actual production, the cavity mold 100 and the extrusion mold 200 are provided with a preheating cavity and a cooling cavity. For example, the preheating cavity adopts an electric heating method, by arranging electric heating wires, and preheating is performed by electric heat conversion; the cooling cavity adopts a water cooling method, and cavities are pre-opened on the cavity mold 100 and the extrusion mold 200. When the die-casting is finalized, cooling of the die-casting can be achieved by passing cooling circulating water. The above-mentioned means are commonly used technologies in mold production and processing, and how to preheat the cavity mold 100 and the extrusion mold 200, and how to cool the die-casting are not the technical solutions claimed for protection in this application, so the specific implementation methods are not repeated in this solution.

[0039] The cavity mold 100 is located below the extrusion mold 200 , and the extrusion mold 200 is adapted to the cavity mold 100 . The trimming assembly 300 is located at the bottom edge of the extrusion mold 200 , and the abutment assembly 400 is located at the top edge of the cavity mold 100 .

[0040] When the extrusion die 200 and the cavity die 100 are extruded, the trimming assembly 300 descends along with the extrusion die 200 until it contacts the abutment assembly 400, thereby completing trimming, stripping and shaping.

[0041] As the die casting proceeds, the die casting has flash, that is, part of the aluminum alloy overflows from between the trimming assembly 300 and the abutment assembly 400, thereby forming irregular "skirts" at the edge of the die casting. These "skirts" are cut off by the trimming assembly 300 when the extrusion die 200 and the cavity die 100 are closed, and as the extrusion die 200 is further lowered, the trimming assembly 300 can also disassemble and release the cut edge material, and the trimming assembly 300 cooperates with the further downward pressure of the extrusion die 200 to correct and shape the edge of the die casting to ensure that the thickness of the trimmed die casting edge is consistent and the edge thickness is full (the edge of the die casting is sharper after conventional trimming, which poses a higher risk for subsequent processing).

[0042] In order to further understand the technical solution, a specific implementation of the trimming assembly 300 is provided. The trimming assembly 300 moves up and down following the extrusion die 200, and completes the flash trimming of the die casting during the die casting process following the extrusion die 200.

[0043] See attached Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, the trimming assembly 300 includes: a resistance ring 310 and an annular cutter 320.

[0044] Among them, an annular cavity 311 is opened inside the resistance ring 310, and a slot 312 connected to the cavity 311 is opened at the bottom of the resistance ring 310 corresponding to the cavity 311. The top of the annular cutter 320 is located in the cavity 311 and slidably cooperates with the cavity 311, and the bottom end of the annular cutter 320 extends out of the slot 312.

[0045] Preferably, the abutment ring 310 is connected to the extrusion die 200 in a detachable fixed manner, so that different trimming assemblies 300 can be switched when producing die-castings of different specifications.

[0046] The cavity 1 311 is provided inside the interference ring 1 310, and the virtual center of the cavity 1 311 is consistent with the virtual center of the interference ring 1 310. Preferably, the cross section of the annular cutter 320 is T-shaped, the upper part of the annular cutter 320 is located in the cavity 1 311, and the lower part extends out of the notch 312. The connection position between the cavity 1 311 and the notch 312 forms a step surface, so that the upper part of the annular cutter 320 cannot escape from the cavity 1 311.

[0047] The end surface of the annular cutter 320 extending out of the notch 312 is a cutting edge for cutting off flash.

[0048] Furthermore, in order to facilitate the removal of the flash from the mold after cutting, the annular cutter 320 is further optimized.

[0049] See attached Figure 3 and Figure 4 Specifically, a plurality of cutting knives 330 are evenly distributed in a ring shape on the circumferential outer wall of the annular cutter 320 , the top of the cutting knives 330 is located in the cavity 1 311 , and the bottom of the cutting knives 330 extends out of the notch 312 and is flush with the bottom surface of the annular cutter 320 .

[0050] Preferably, the cutter 330 is arranged perpendicular to the circumferential outer wall of the annular cutter 320, and the height is half of the height of the annular cutter 320. Preferably, the number of the cutter 330 is 6. When the annular cutter 320 cuts off the flash, the flash may form a ring shape, and the flash cannot be removed from the die casting or the mold. After the cutter 330 is arranged, while the annular cutter 320 cuts off the flash, the cutter 330 also divides the flash, so that the flash is divided into several sections for falling. Preferably, the bottom end of the cutter 330 is consistent with the blade of the annular cutter 320, that is, the cutting depth of the annular cutter 320 and the cutter 330 is consistent, so as to ensure that the flash can be divided into multiple sections by the cutter 330.

[0051] In order to ensure that the flash trimmed by the annular cutter 320 can be pushed out of the mold, the trimming assembly 300 is further optimized.

[0052] See attached Figure 4 , Figure 5and Figure 6 As shown, in one embodiment, the trimming assembly 300 further includes: a stripping slider 340 and a reset pull rod 350 .

[0053] Among them, a plurality of cavities 313 are evenly opened on the circumferential outer wall of the resistance ring 1 310 , the top of cavity 1 311 is connected to cavity 2 313 , the stripping slider 340 is slidably set in cavity 2 313 , and is connected to the inner wall of cavity 2 313 through a reset pull rod 350 .

[0054] Specifically, the second cavity 313 is used to place the stripping slider 340, and the top surface of the stripping slider 340 slides with the inner top wall of the second cavity 313. Preferably, the top surface of the second cavity 313 has a slide rail 314, and the stripping slider 340 is slidably connected with the second cavity 313 through the slide rail 314.

[0055] Preferably, one end of the reset rod 350 is fixed to the inner wall of the corresponding opening of cavity 2 313, and the other end extends into the stripping slider 340 and is fixed thereto, and the reset rod 350 extending into the stripping slider 340 is gap-matched with the stripping slider 340.

[0056] Furthermore, in order to realize the linkage between the annular cutter 320 and the stripping slider 340, the bottom surface of the stripping slider 340 is set as an inclined surface. The top of the annular cutter 320 corresponding to the stripping slider 340 is slidably matched with the bottom surface of the stripping slider 340, and the bottom end position of the stripping slider 340 extending out of the cavity 2 313 is higher than the bottom surface of the annular cutter 320.

[0057] When the annular cutter 320 moves downward with the extrusion die 200 and gradually acts on the flash, the annular cutter 320 is forced to retract into the cavity 1 311, which causes the top of the annular cutter 320 to be squeezed with the bottom surface of the stripping slider 340, so that the stripping slider 340 can be ejected.

[0058] When the stripper slider 340 is pushed out, the bottom end gradually extends out of the second cavity 313 until the bottom end acts on the flash. When the force of the stripper slider 340 on the flash and the force of the annular cutter 320 on the stripper slider 340 reach a balance, as the annular cutter 320 further cuts the flash, the stripper slider 340 can also push the flash out of the mold.

[0059] When the annular cutter 320 completely cuts off the flash, the reset rod 350 pulls the stripping slider 340 back into cavity 2 313. At this time, the stripping slider 340 acts on the annular cutter 320, so that the annular cutter 320 is pushed out of cavity 1 311, thereby completing the reset of the annular cutter 320 so that the flash can be cut during the next mold closing.

[0060] After the truncation of the flash edge is completed, the annular cutter 320 is reset under the action of the reset pull rod 350, that is, the reset pull rod 350 extends out of the cavity 1 311. This will cause the ejected annular cutter 320 to directly act on the abutment ring 2 410, which will cause the two to collide and be damaged.

[0061] Therefore, in one embodiment, a specific embodiment of the resistance assembly 400 is provided. The resistance assembly 400 provides an escape space when the reset pull rod 350 is reset, and when the extrusion die 200 is further extruded, the molding cavity forms a nearly closed structure, so that the edge of the die casting is fuller and the molding quality is better.

[0062] See attached Figure 7 and Figure 8 As shown, in this embodiment, the resistance assembly 400 includes: a resistance ring 410 and a top plate 420.

[0063] Among them, the top surface of the resistance ring 410 is provided with an annular structured air avoidance groove 411 corresponding to the position of the notch 312, and a plurality of reset push rods 412 are evenly distributed in the air avoidance groove 411. The top plate 420 is arranged at the opening of the air avoidance groove 411, and the bottom surface is connected to the reset push rod 412. In normal state, the top surface of the top plate 420 is flush with the top surface of the resistance ring 410.

[0064] Specifically, the second abutment ring 410 is connected to the cavity mold 100 in a detachable fixed manner, so that when producing die-castings of different specifications, the second abutment ring 410 matched with the trimming assembly 300 can be replaced.

[0065] The avoidance groove 411 on the top surface of the second abutment ring 410 corresponds to the position of the notch 312, ensuring that the second abutment ring 410 can extend into the avoidance groove 411 when it is reset. In order to avoid the opening of the avoidance groove 411 being blocked by the molten aluminum alloy flowing into it, and to avoid the flash being cut off, the flash at this position is not easily subjected to force.

[0066] Therefore, a top plate 420 is provided at the opening of the air-avoiding groove 411 . In normal state, the top plate 420 is flush with the top surface of the second abutment ring 410 , thus ensuring that the flash edge can be stably cut by the annular cutter 320 .

[0067] When the annular cutter 320 is reset, the bottom end of the annular cutter 320 pushes open the top plate 420 and extends into the air-avoiding groove 411 .

[0068] Preferably, the clearance groove 411 and the top plate 420 are clearance matched, so that the top plate 420 can move up and down in the clearance groove 411. At the same time, the clearance groove 411 and the annular cutter 320 are also clearance matched to ensure that the annular cutter 320 can extend into the clearance groove 411.

[0069] Furthermore, when a cutting knife 330 is arranged outside the circumference of the annular cutter 320, the air avoidance groove 411 is also provided with a groove cooperating with the cutting knife 330, and the structure of the top plate 420 is also improved accordingly to ensure that the cutting knife 330 can also extend into the air avoidance groove 411.

[0070] In this way, when the extrusion die 200 and the cavity die 100 are squeezed into place, the bottom surface of the annular cutter 320 contacts the top surface of the top plate 420, and the bottom end of the annular cutter 320 extends into the air avoidance groove 411, making the molding cavity temporarily become a closed space, thereby improving the efficiency of die casting.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them.

Claims

1. Lightweight aluminum alloy die-casting mold, characterized in that: include: A cavity mold (100), an extrusion mold (200), a trimming assembly (300) and an abutment assembly (400); The cavity mold (100) is located below the extrusion mold (200), and the extrusion mold (200) is adapted to the cavity mold (100), the trimming assembly (300) is located at the bottom edge of the extrusion mold (200), and the abutment assembly (400) is located at the top edge of the cavity mold (100); When the extrusion die (200) and the cavity die (100) are extruding and molding, the trimming component (300) descends along with the extrusion die (200) until it contacts the abutment component (400), thereby completing trimming, stripping, and shaping.

2. The lightweight aluminum alloy die-casting mold according to claim 1, characterized in that: The trimming assembly (300) comprises at least: a first abutment ring (310) and an annular cutter (320); An annular cavity (311) is provided inside the abutment ring (310), and a notch (312) communicating with the cavity (311) is provided on the bottom surface of the abutment ring (310), corresponding to the cavity (311). The top end of the annular cutter (320) is located in the cavity (311) and is slidably matched with the cavity (311), and the bottom end of the annular cutter (320) extends out of the notch (312).

3. The lightweight aluminum alloy die-casting mold according to claim 2, characterized in that: A plurality of cutting knives (330) are evenly distributed in a ring shape on the circumferential outer wall of the annular cutter (320); the top ends of the cutting knives (330) are located in cavity 1 (311); the bottom ends of the cutting knives (330) extend out of the notch (312) and are flush with the bottom surface of the annular cutter (320).

4. The lightweight aluminum alloy die-casting mold according to claim 2, characterized in that: The trimming assembly (300) further comprises: a stripping slider (340) and a reset pull rod (350); A plurality of cavities (313) are evenly arranged on the circumferential outer wall of the abutment ring (310); the top end of the cavity (311) is connected to the cavity (313); the stripping slider (340) is slidably disposed in the cavity (313) and is connected to the inner wall of the cavity (313) via the reset rod (350).

5. The lightweight aluminum alloy die-casting mold according to claim 4, characterized in that: The top surface of the second cavity (313) is provided with a slide rail (314), and the stripping slide block (340) is slidably connected to the second cavity (313) via the slide rail (314); One end of the reset pull rod (350) is fixed to the inner wall of the corresponding opening of cavity 2 (313), and the other end extends into the stripping slider (340) and is fixed thereto, and the reset pull rod (350) extending into the stripping slider (340) is clearance-matched with the stripping slider (340).

6. The lightweight aluminum alloy die-casting mold according to claim 4, characterized in that: The bottom surface of the stripping slider (340) is an inclined surface, and the top of the annular cutter (320) corresponding to the stripping slider (340) is slidably matched with the bottom surface of the stripping slider (340), and the bottom end of the stripping slider (340) extending out of cavity 2 (313) is higher than the bottom surface of the annular cutter (320).

7. The lightweight aluminum alloy die-casting mold according to claim 2, characterized in that: The abutment assembly (400) at least comprises: a second abutment ring (410) and a top plate (420); The top surface of the second abutment ring (410) is provided with an annularly structured air avoidance groove (411) corresponding to the position of the notch (312), a plurality of reset push rods (412) are evenly distributed in the air avoidance groove (411), the top plate (420) is arranged at the opening of the air avoidance groove (411), and the bottom surface is connected to the reset push rods (412), and in a normal state, the top surface of the top plate (420) is flush with the top surface of the second abutment ring (410).

8. The lightweight aluminum alloy die-casting mold according to claim 7, characterized in that: When the extrusion die (200) and the cavity die (100) are squeezed into place, the bottom surface of the annular cutter (320) contacts the top surface of the top plate (420), and the bottom end of the annular cutter (320) extends into the air avoidance groove (411).

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