Worm gear die-casting forming die and working method thereof

Abstract

The invention particularly relates to a worm gear die-casting forming die which comprises an upper die mechanism, a lower die mechanism, a driving mechanism and a demolding mechanism. The lower die mechanism comprises at least three core die assemblies which are evenly distributed in the circumferential direction and can move in the radial direction. In the mold closing stage, the driving mechanism drives all the core mold assemblies to synchronously contract towards the radial direction of the central shaft, so that the working surfaces of all the core mold assemblies jointly form a complete worm wheel cavity; after a worm gear cavity is formed by the core mold assembly, the upper mold mechanism is downwards pressed with the lower mold mechanism, so that a metal melt injected into the worm gear cavity is solidified and formed under pressure; in the mold opening stage, the driving mechanism drives all the core mold assemblies to synchronously expand outwards in the radial direction, and wrapping on the formed worm wheel is relieved; and after the core mold assembly completes radial expansion, the demolding mechanism ejects out the formed worm gear in the axial direction to achieve demolding. According to the worm gear die-casting forming die and the working method thereof, worm gear parts are produced through the die-casting technology, one-time forming is achieved, and the production efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting dies, and in particular to a worm gear die-casting die and a working method thereof. Background Art

[0002] Aluminum alloy worm gears are usually produced by machining or sand casting. The disadvantages of using machining to produce worm gear parts are long production cycles, high costs, and high technical requirements for workers; if sand casting is used to produce worm gear parts, the disadvantages are long mold opening cycles and difficulty in ensuring manufacturing accuracy.

[0003] In industrial production, such as agricultural machinery and mining machinery, where the requirements for worm gear manufacturing precision are not too high, we can use die-casting technology to produce worm gear parts. If the requirements for manufacturing precision and mechanical properties are very high, die-casting technology can also be used. As long as the worm gear blank is machined, the requirements can be met.

[0004] Therefore, it is urgent to design a worm gear die-casting mold to produce worm gear parts. Summary of the Invention

[0005] The purpose of the present invention is to provide a worm gear die-casting mold and a working method thereof, which can produce worm gear parts through a die-casting process, form them in one step, have high production efficiency, and avoid casting defects such as slag inclusions, pores, shrinkage, and shrinkage holes in castings produced by traditional manufacturing processes.

[0006] In order to solve the above technical problems, the present invention provides a worm gear die-casting mold, comprising:

[0007] An upper mold mechanism, a lower mold mechanism, a driving mechanism and a demoulding mechanism; the lower mold mechanism includes at least three radially movable core mold assemblies uniformly distributed along the circumferential direction; in the mold closing stage, the driving mechanism drives all the core mold assemblies to synchronously contract radially toward the central axis, so that the working surfaces of each core mold assembly together form a complete worm gear cavity; after the core mold assemblies form the worm gear cavity, the upper mold mechanism presses downward with the lower mold mechanism, so that the metal melt injected into the worm gear cavity solidifies and forms under pressure; in the mold opening stage, the driving mechanism drives all the core mold assemblies to synchronously expand radially outward to release the covering of the formed worm gear; after the core mold assembly completes radial expansion, the demoulding mechanism ejects the formed worm gear axially to achieve demoulding. Since the liquid or semi-solid metal is formed under static pressure, the worm gear component has very few pores, the macroscopic and microscopic segregation is significantly reduced, the grain refinement is enhanced, and the internal stress of the worm gear component is eliminated to a certain extent. At the same time, the microstructure of the worm gear component is stable and the dimensional accuracy and consistency of the parts are significantly higher than those of sand casting.

[0008] Furthermore, the upper mold mechanism includes: a C-shaped bracket, a first hydraulic cylinder, an upper mold base, a punch, and a tapered hole locking sleeve; the first hydraulic cylinder is fixed to the top of the C-shaped bracket; the punch passes through the upper mold base and is fixedly connected to the upper surface of the tapered hole locking sleeve; the other end of the punch is fixedly connected to the piston rod of the first hydraulic cylinder; when the core mold assembly forms a worm gear cavity, the first hydraulic cylinder is suitable for driving the tapered hole locking sleeve to move downward to tighten the worm gear cavity, so that the metal melt injected into the worm gear cavity is solidified and formed under pressure.

[0009] Furthermore, a slider is provided at the bottom of the core mold assembly; the lower mold mechanism further includes a lower mold base; the lower mold base is provided with a plurality of guide grooves; the sliders of each core mold assembly converge along the corresponding guide grooves to form a worm gear cavity. The guide grooves serve to guide the movement of the core mold assembly.

[0010] Furthermore, the lower mold mechanism also includes: a guide assembly corresponding to each core mold assembly, and a circular support seat fixed to the C-shaped support; a guide hole is provided on the side of the core mold assembly away from the worm gear cavity; the guide assembly includes: a guide rod, a guide seat, and a connecting plate fixedly connected in sequence; the connecting plate is fixedly connected to the inner side of the circular support seat; the guide rods are inserted into the corresponding guide holes to allow the core mold assembly to radially contract or expand along the guide rods. By providing the guide assembly, the core mold assembly can be moved radially along the guide rods, ensuring that the movement does not cause position deviation, thereby improving the quality of the worm gear molding.

[0011] Furthermore, the lower mold mechanism also includes: a plurality of support rods arranged circumferentially and staggered with the core mold assembly; a tray fixedly mounted on the bottom of the lower mold base; one end of each support rod fixed to the bottom of the tray; and the other end of each support rod fixed to the inner side of the annular support base. The plurality of support rods can provide support for the tray and the lower mold base.

[0012] Furthermore, the drive mechanism includes: a cylinder support disposed within a circular support seat, drive hydraulic cylinders symmetrically distributed on both sides of the cylinder support, a sliding seat fixedly connected to the output shaft of the drive hydraulic cylinder, and a sliding sleeve fixed to the upper surface of the sliding seat; the sliding sleeve is provided with a plurality of tie rods; one end of each tie rod is rotatably connected to the sliding sleeve; the other end of each tie rod is riveted to the connection hole of the core mold assembly; the bottom of the tray is fixedly connected to the cylinder support via a guide sleeve; the sliding sleeve is slidably connected to the guide sleeve; during the mold closing phase, the drive hydraulic cylinder drives the sliding sleeve downward, causing the tie rods to contract in an umbrella shape, driving the corresponding core mold assembly to synchronously contract radially toward the central axis along the guide rod, so that the working surfaces of each core mold assembly jointly form a complete worm gear cavity; during the mold opening phase, the drive hydraulic cylinder drives the sliding sleeve upward, causing the tie rods to expand in an umbrella shape, driving the corresponding core mold assembly to synchronously expand radially outward along the guide rod, thereby releasing the covering of the formed worm gear. By providing a drive mechanism, the worm gear cavity is automatically formed, thereby improving production efficiency.

[0013] Furthermore, the demolding mechanism includes: a sliding shaft disposed within a guide sleeve, a push rod seat fixedly connected to the sliding shaft, and a second hydraulic cylinder; the output shaft of the second hydraulic cylinder is fixedly connected to the sliding shaft; the push rod seat is slidably connected to the guide sleeve; three groups of push rods are circumferentially disposed on the push rod seat; one end of each push rod is fixedly connected to the push rod seat; the other end of each push rod passes through the tray and the lower mold base in sequence, and the end of the push rod is flush with the inner surface of the lower mold base; when the core mold assembly completes radial expansion, the second hydraulic cylinder is adapted to drive the sliding shaft upward so that each push rod axially ejects the molded worm gear to achieve demolding. Automatic demolding is achieved through the demolding mechanism, solving the problem of manual demolding.

[0014] Furthermore, cooling water pipes and heating pipes are provided in the tapered hole locking sleeve and the tray. The heating pipes are used to preheat the tapered hole locking sleeve and the lower die base in advance to avoid cracking of the casting caused by excessive temperature differences. The cooling water pipes are provided to cool the tapered hole locking sleeve and the lower die base in time, and subsequent demolding is performed after cooling to a certain temperature.

[0015] Furthermore, four guide pillars are provided around the upper die base; both ends of the guide pillars are respectively threadedly connected to the upper die base and the tapered hole locking sleeve; and a spring is provided around the outer sleeve of the guide pillars.

[0016] On the other hand, the present invention further provides a working method of a worm gear die-casting mold, comprising: the working method is suitable for preparing a worm gear component using the worm gear die-casting mold.

[0017] Beneficial effects of the present invention:

[0018] 1. Through die casting, it can be formed in one step, which improves the production efficiency of worm gear parts;

[0019] 2. Since the liquid or semi-solid metal is formed under static pressure, the worm gear has very few pores, the macro- and micro-segregation is significantly reduced, the grain refinement is enhanced, and the internal stress of the worm gear is eliminated to a certain extent. At the same time, the microstructure of the worm gear is stable and the dimensional accuracy and consistency of the parts are significantly higher than those of sand casting. The formed worm gear has the advantages of low density, high specific strength, strong corrosion resistance, and good mechanical properties.

[0020] 3. Automatic demoulding is achieved by combining the driving mechanism and the demoulding mechanism. Compared with manual demoulding, the production efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 It is a structural schematic diagram of the worm gear die-casting mold of the present invention;

[0023] Figure 2 It is a partial schematic diagram of the upper die mechanism of the worm gear die-casting die of the present invention;

[0024] Figure 3 Schematic diagram of the cooperation between the lower die base and the core die assembly of the worm gear die-casting mold of the present invention;

[0025] Figure 4 Schematic diagram of the upper die removal mechanism of the worm gear die-casting die of the present invention;

[0026] Figure 5 is a top view of the worm gear die-casting mold of the present invention;

[0027] Figure 6 It is a partial schematic diagram of the worm gear die-casting mold of the present invention;

[0028] Figure 7 This is a front view of the worm gear die-casting mold of the present invention;

[0029] Figure 8 It is a schematic diagram of the driving mechanism and demoulding mechanism of the worm gear die-casting mold of the present invention.

[0030] In the picture:

[0031] Upper die mechanism 1, C-shaped bracket 11, first hydraulic cylinder 12, upper die base 13, punch 14, tapered hole locking sleeve 15, guide column 16, lower die mechanism 2, core die assembly 21, slider 211, guide hole 212, connecting hole 213, tooth surface 214, lower die base 22, guide groove 221, guide assembly 23, guide rod 231, guide seat 232, connecting plate 233, annular bracket seat 24, tray 25, support rod 26, driving mechanism 3, cylinder bracket 31, driving hydraulic cylinder 32, sliding seat 33, sliding sleeve 34, pull rod 35, guide sleeve 36, demoulding mechanism 4, sliding shaft 41, push rod seat 42, second hydraulic cylinder 43, push rod 44. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0033] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be broadly understood, for example, to mean fixed, removable, or integral; mechanically or electrically connected; directly or indirectly through an intermediary; or internally connected between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example 1

[0035] Figure 1 It is a structural schematic diagram of the worm gear die-casting mold of the present invention;

[0036] like Figure 1As shown, this embodiment provides a worm gear die-casting mold, including: an upper mold mechanism 1, a lower mold mechanism 2, a driving mechanism 3 and a demolding mechanism 4; the lower mold mechanism 2 includes at least three radially movable core mold assemblies 21 evenly distributed along the circumferential direction; in the mold closing stage, the driving mechanism 3 drives all the core mold assemblies 21 to synchronously shrink radially toward the central axis, so that the working surfaces of each core mold assembly 21 together constitute a complete worm gear cavity; after the core mold assembly 21 forms the worm gear cavity, the upper mold mechanism 1 is pressed downward with the lower mold mechanism 2, so that the metal melt injected into the worm gear cavity is solidified and formed under pressure; in the mold opening stage, the driving mechanism 3 drives all the core mold assemblies 21 to synchronously expand radially outward to release the covering of the molded worm gear; when the core mold assembly 21 completes radial expansion, the demolding mechanism 4 ejects the molded worm gear axially to achieve demolding.

[0037] Specifically, the drive mechanism 3 drives all core mold assemblies 21 to synchronously contract radially toward the central axis, so that the working surfaces of each core mold assembly 21 together form a complete worm gear cavity. Subsequently, the upper mold mechanism 1 is pressed downwardly with the lower mold mechanism 2, so that the metal melt injected into the worm gear cavity solidifies and forms under pressure. The drive mechanism 3 drives all core mold assemblies 21 to synchronously expand radially outward to release the covering of the molded worm gear. Finally, the demolding mechanism 4 ejects the molded worm gear axially to achieve demolding. Since the liquid or semi-solid metal is molded under static pressure, the worm gear component has very few pores, the macroscopic and microscopic segregation is significantly reduced, the grain refinement is enhanced, and the internal stress of the worm gear component is eliminated to a certain extent. At the same time, the microstructure of the worm gear component is stable and the dimensional accuracy and consistency of the part are significantly higher than those of sand casting.

[0038] Figure 2 It is a partial schematic diagram of the upper die mechanism of the worm gear die-casting die of the present invention;

[0039] like Figure 2 As shown, the upper mold mechanism 1 includes: a C-shaped bracket 11, a first hydraulic cylinder 12, an upper mold base 13, a punch 14, and a tapered hole locking sleeve 15; the first hydraulic cylinder 12 is fixed to the top of the C-shaped bracket 11; the punch 14 passes through the upper mold base 13 and is fixedly connected to the upper surface of the tapered hole locking sleeve 15; the other end of the punch 14 is fixedly connected to the piston rod of the first hydraulic cylinder 12; when the core mold assembly 21 forms a worm gear cavity, the first hydraulic cylinder 12 is suitable for driving the tapered hole locking sleeve 15 to move downward to tighten the worm gear cavity, so that the metal melt injected into the worm gear cavity is solidified and formed under pressure.

[0040] Among them, the bottom of the tapered hole locking sleeve 15 is provided with a tapered surface adapted to the worm gear profile; when the liquid or semi-solid metal is placed in the worm gear cavity, the first hydraulic cylinder 12 drives the tapered hole locking sleeve 15 to move downward, fastening the worm gear cavity, and after solidification, a formed worm gear component can be obtained.

[0041] Figure 3Schematic diagram of the cooperation between the lower die base and the core die assembly of the worm gear die-casting mold of the present invention;

[0042] like Figure 3 As shown, the bottom of the core mold assembly 21 is provided with a slider 211; the lower mold mechanism 2 also includes a lower mold base 22; the lower mold base 22 is provided with a plurality of guide grooves 221; the sliders 211 of each core mold assembly 21 converge along the corresponding guide grooves 221 to form a worm gear cavity. The tooth-shaped surfaces 214 at the front ends of each core mold assembly 21 converge to form the tooth surfaces of the worm gear component, thereby forming the worm gear component in one step.

[0043] Figure 4 Schematic diagram of the upper die removal mechanism of the worm gear die-casting die of the present invention;

[0044] Figure 5 is a top view of the worm gear die-casting mold of the present invention;

[0045] Figure 6 It is a partial schematic diagram of the worm gear die-casting mold of the present invention;

[0046] Figure 7 This is a front view of the worm gear die-casting mold of the present invention;

[0047] like Figures 4 to 7 As shown, the lower mold mechanism 2 also includes: a guide assembly 23 corresponding to each core mold assembly 21, and a circular bracket seat 24 fixed on the C-shaped bracket 11; a guide hole 212 is provided on the side of the core mold assembly 21 away from the worm gear cavity; the guide assembly 23 includes: a guide rod 231, a guide seat 232, and a connecting plate 233 fixedly connected in sequence; the connecting plate 233 is fixedly connected to the inner side of the circular bracket seat 24; the guide rod 231 is inserted into the corresponding guide hole 212 to allow the core mold assembly 21 to radially contract or expand along the guide rod 231. By providing the guide assembly 23, the core mold assembly 21 is allowed to move radially along the guide rod 231, ensuring that there will be no position deviation during movement, thereby improving the quality of worm gear molding.

[0048] Optionally, the lower mold mechanism 2 further includes: a plurality of support rods 26 arranged circumferentially and staggered with the core mold assembly 21; a tray 25 fixedly mounted on the bottom of the lower mold base 22; one end of the support rod 26 fixed to the bottom of the tray 25; and the other end of the support rod 26 fixed to the inner side of the annular support base 24. The provision of the plurality of support rods 26 can provide support for the tray 25 and the lower mold base 22.

[0049] Figure 8 Schematic diagram of the drive mechanism and demoulding mechanism of the worm gear die-casting mold of the present invention

[0050] like Figure 8As shown, the driving mechanism 3 includes: a cylinder bracket 31 arranged in the annular bracket seat 24, a driving hydraulic cylinder 32 symmetrically distributed on both sides of the cylinder bracket 31, a sliding seat 33 fixedly connected to the output shaft of the driving hydraulic cylinder 32, and a sliding sleeve 34 fixed to the upper surface of the sliding seat 33; a plurality of pull rods 35 are provided on the sliding sleeve 34; one end of the pull rod 35 is rotatably connected to the sliding sleeve 34; the other end of the pull rod 35 is riveted to the connecting hole 213 of the core mold assembly 21; the bottom of the tray 25 is fixedly connected to the cylinder bracket 31 through a guide sleeve 36 The sliding sleeve 34 is slidably connected to the guide sleeve 36. During the mold closing stage, the hydraulic cylinder 32 is driven to drive the sliding sleeve 34 downward, causing the pull rod 35 to contract in an umbrella shape, driving the corresponding core mold assembly 21 to synchronously contract radially toward the central axis along the guide rod 231, so that the working surfaces of each core mold assembly 21 together form a complete worm gear cavity. During the mold opening stage, the hydraulic cylinder 32 is driven to drive the sliding sleeve 34 upward, causing the pull rod 35 to expand in an umbrella shape, driving the corresponding core mold assembly 21 to synchronously expand radially outward along the guide rod 231, thereby releasing the covering of the formed worm gear. By providing the drive mechanism 3, the worm gear cavity can be automatically formed, thereby improving production efficiency.

[0051] Optionally, the demolding mechanism 4 includes: a sliding shaft 41 arranged in the guide sleeve 36, a push rod seat 42 fixedly connected to the sliding shaft 41, and a second hydraulic cylinder 43; the output shaft of the second hydraulic cylinder 43 is fixedly connected to the sliding shaft 41; the push rod seat 42 is slidably connected to the guide sleeve 36; three groups of push rods 44 are circumferentially arranged on the push rod seat 42; one end of the push rod 44 is fixedly connected to the push rod seat 42; the other end of the push rod 44 passes through the tray 25 and the lower mold base 22 in sequence, and the end of the push rod 44 is flush with the inner surface of the lower mold base 22; when the core mold assembly 21 completes radial expansion, the second hydraulic cylinder 43 is suitable for driving the sliding shaft 41 to move upward, so that each push rod 44 axially ejects the molding worm gear to achieve demolding. After the worm gear is formed, the hydraulic cylinder 32 is driven to drive the sliding sleeve 34 to move upward, and the pull rod 35 drives the corresponding core mold assembly 21 to expand radially outward along the guide rod 231 to release the covering of the molded worm gear. Then the second hydraulic cylinder 43 drives the sliding shaft 41 to move upward, so that each push rod 44 lifts the solidified worm gear to complete the demolding.

[0052] In this embodiment, cooling water pipes and heating pipes are installed in the tapered locking sleeve 15 and the tray 25. The heating pipes are used to preheat the tapered locking sleeve 15 and the lower die base 22 in advance to prevent cracking of the casting caused by excessive temperature differences. The cooling water pipes are used to cool the tapered locking sleeve 15 and the lower die base 22 in a timely manner, and subsequent demolding is performed after cooling to a certain temperature.

[0053] In this embodiment, four guide posts 16 are circumferentially arranged on the upper die base 13. The ends of the guide posts 16 are threadedly connected to the upper die base 13 and the tapered locking sleeve 15, respectively. A spring is provided on the outer sleeve of the guide posts 16. The spring acts as a shock absorber and prevents damage to the tapered locking sleeve 15.

[0054] Example 2

[0055] This embodiment 2 provides a working method of a worm gear die-casting mold, including: the working method is suitable for using the worm gear die-casting mold of embodiment 1 to prepare a worm gear component.

[0056] Specifically, according to the number of worm gear teeth, a core mold assembly 21 with the same number of worm gear teeth is processed. In this embodiment, the number of worm gear teeth is thirty, and thirty core mold assemblies 21 are provided. When the two driving hydraulic cylinders 32 and the second hydraulic cylinder 43 are in place, the thirty pull rods 35 make the thirty core mold assemblies 21 in the starting position. At this time, the thirty core mold assemblies 21 form a worm gear cavity. Then, the tapered hole locking sleeve 15 and the lower mold base 22 are heated by a heating tube, and the circulation volume of the cooling water pipe is appropriately adjusted to heat the temperature to the required value. Then, a release coating is applied to the lower mold base 22, and the molten aluminum alloy (weighed and smelted) is poured into the worm gear cavity. The first hydraulic cylinder 12 is suitable for driving the tapered hole locking sleeve 15 moves downward, when the tapered hole locking sleeve 15 locks the thirty core mold assemblies 21, the four springs are compressed, and the upper mold mechanism 1 applies static pressure to the molten metal, maintains the pressure for a certain period of time, and then the first hydraulic cylinder 12 moves upward, the pressure application process ends, the tapered hole locking sleeve 15 disengages from the conical surface formed by the thirty core mold assemblies 21, and the two driving hydraulic cylinders 32 drive the sliding sleeve 34 to move upward, and the sliding sleeve 34 drives the thirty pull rods 35 to open in an umbrella shape, and the thirty core mold assemblies 21 expand radially outward synchronously along the guide rod 231, loosening the worm gear component, and the second hydraulic cylinder 43 drives the sliding shaft 41 to move upward, so that the three push rods 44 lift the solidified worm gear component, and the demolding can be completed.

[0057] The hydraulic cylinder 32 is driven to drive the sliding sleeve 34 to move downward, the three push rods 44 return to their original positions, and the thirty pull rods 35 shrink in an umbrella shape, driving the corresponding core mold assemblies 21 to shrink radially toward the center axis along the guide rod 231 synchronously, so that the working surfaces of each core mold assembly 21 together constitute a complete worm gear cavity, completing the mold closing action, thereby completing the production of the next worm gear.

[0058] In summary, the worm gear die-casting mold and its working method of the present invention can be formed in one time through die-casting, thereby improving the production efficiency of worm gear parts; liquid or semi-solid metal is placed in the worm gear cavity, and then the worm gear cavity is engaged by the upper mold mechanism 1 to obtain the worm gear part. Since the liquid or semi-solid metal is formed under static pressure, the worm gear part has very few pores, the macro- and micro-segregation is significantly reduced, the grain refinement is enhanced, and the stress in the worm gear part is eliminated to a certain extent. At the same time, the microstructure of the worm gear part is stable and the dimensional accuracy and consistency of the parts are significantly higher than those of sand casting; automatic demolding is achieved by combining the driving mechanism 3 and the demolding mechanism 4. Compared with manual demolding, the production efficiency is greatly improved.

[0059] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A worm gear die-casting mold, characterized in that: include: An upper mold mechanism (1), a lower mold mechanism (2), a driving mechanism (3) and a demoulding mechanism (4); The lower mold mechanism (2) comprises at least three radially movable core mold assemblies (21) uniformly distributed along the circumferential direction; During the mold closing stage, the driving mechanism (3) drives all the core mold assemblies (21) to synchronously contract radially toward the central axis, so that the working surfaces of the core mold assemblies (21) together form a complete worm gear cavity; After the core mold assembly (21) forms the worm gear cavity, the upper mold mechanism (1) is pressed downwardly with the lower mold mechanism (2), so that the metal melt injected into the worm gear cavity is solidified under pressure; During the mold opening stage, the driving mechanism (3) drives all core mold components (21) to synchronously expand radially outward to release the covering of the molded worm gear; When the core mold assembly (21) completes radial expansion, the demoulding mechanism (4) ejects the molded worm gear in the axial direction to achieve demoulding.

2. The worm gear die-casting mold according to claim 1, characterized in that: The upper die mechanism (1) comprises: a C-shaped bracket (11), a first hydraulic cylinder (12), an upper die base (13), a punch (14), and a tapered hole locking sleeve (15); The first hydraulic cylinder (12) is fixed on the top of the C-shaped bracket (11); The punch (14) passes through the upper die base (13) and is fixedly connected to the upper surface of the tapered hole locking sleeve (15); The other end of the punch (14) is fixedly connected to the piston rod of the first hydraulic cylinder (12); After the core mold assembly (21) forms the worm gear cavity, the first hydraulic cylinder (12) is adapted to drive the tapered hole locking sleeve (15) to move downward to fasten the worm gear cavity, so that the metal melt injected into the worm gear cavity is solidified under pressure.

3. The worm gear die-casting mold according to claim 2, characterized in that: A slider (211) is provided at the bottom of the core mold assembly (21); The lower die mechanism (2) further includes a lower die base (22); The lower die base (22) is provided with a plurality of guide grooves (221); The sliders (211) of each core mold assembly (21) are assembled along the corresponding guide grooves (221) to form a worm gear cavity.

4. The worm gear die-casting mold according to claim 3, characterized in that: The lower mold mechanism (2) further comprises: a guide assembly (23) corresponding to each core mold assembly (21), and a circular ring-shaped support seat (24) fixed on the C-shaped support (11); A guide hole (212) is provided on a side of the core mold assembly (21) away from the worm gear cavity; The guide assembly (23) comprises: a guide rod (231), a guide seat (232), and a connecting plate (233) which are fixedly connected in sequence; The connecting plate (233) is fixedly connected to the inner side of the annular bracket seat (24); The guide rod (231) is inserted into the corresponding guide hole (212) so that the core mold assembly (21) can be radially contracted or expanded along the guide rod (231).

5. The worm gear die-casting mold according to claim 4, characterized in that: The lower mold mechanism (2) further comprises: a plurality of supporting rods (26) arranged circumferentially staggered with the core mold assembly (21); A tray (25) is fixedly provided at the bottom of the lower die base (22); One end of the support rod (26) is fixed to the bottom of the tray (25); The other end of the supporting rod (26) is fixed on the inner side of the annular support seat (24).

6. The worm gear die-casting mold according to claim 5, characterized in that: The driving mechanism (3) comprises: a cylinder support (31) arranged in a circular support seat (24), a driving hydraulic cylinder (32) symmetrically distributed on both sides of the cylinder support (31), a sliding seat (33) fixedly connected to the output shaft of the driving hydraulic cylinder (32), and a sliding sleeve (34) fixed on the upper surface of the sliding seat (33); The sliding sleeve (34) is provided with a plurality of pull rods (35); One end of the pull rod (35) is rotatably connected to the sliding sleeve (34); The other end of the pull rod (35) is riveted to the connecting hole (213) of the core mold assembly (21); The bottom of the tray (25) is fixedly connected to the cylinder bracket (31) via a guide sleeve (36); The sliding sleeve (34) is slidably connected to the guide sleeve (36); During the mold closing stage, the driving hydraulic cylinder (32) drives the sliding sleeve (34) to move downward, and the pull rod (35) contracts in an umbrella shape, driving the corresponding core mold assembly (21) to synchronously contract radially toward the central axis along the guide rod (231), so that the working surfaces of each core mold assembly (21) together form a complete worm gear cavity; During the mold opening stage, the driving hydraulic cylinder (32) drives the sliding sleeve (34) to move upward, and the pull rod (35) opens in an umbrella shape, driving the corresponding core mold assembly (21) to expand radially outward along the guide rod (231) synchronously, thereby releasing the covering of the molded worm gear.

7. The worm gear die-casting mold according to claim 6, characterized in that: The demoulding mechanism (4) comprises: a sliding shaft (41) arranged in a guide sleeve (36), a push rod seat (42) fixedly connected to the sliding shaft (41), and a second hydraulic cylinder (43); The output shaft of the second hydraulic cylinder (43) is fixedly connected to the sliding shaft (41); The push rod seat (42) is slidably connected to the guide sleeve (36); Three groups of push rods (44) are arranged circumferentially on the push rod seat (42); One end of the push rod (44) is fixedly connected to the push rod seat (42); The other end of the push rod (44) passes through the tray (25) and the lower die base (22) in sequence, and the end of the push rod (44) is flush with the inner surface of the lower die base (22); When the core mold assembly (21) completes radial expansion, the second hydraulic cylinder (43) is suitable for driving the sliding shaft (41) to move upward, so that each ejector rod (44) ejects the molded worm gear axially to achieve demoulding.

8. The worm gear die-casting mold according to claim 5, characterized in that: The tapered hole locking sleeve (15) and the tray (25) are both provided with cooling water pipes and heating pipes.

9. The worm gear die-casting mold according to claim 2, characterized in that: The upper die seat (13) is circumferentially provided with four guide pillars (16); The two ends of the guide column (16) are respectively threadedly connected to the upper die base (13) and the tapered hole locking sleeve (15); The outer sleeve of the guide post (16) is provided with a spring.

10. A method for operating a worm gear die-casting mold, characterized in that: The working method is suitable for preparing a worm gear component using the worm gear die-casting mold according to any one of claims 1 to 9.

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