Metal mold with self-locking structure

Abstract

The utility model discloses a metal mold of self -locking structure of closing mould, relate to left and right half mould closing mould technical field. Including bottom die, left half mould and right half mould, bottom die both sides upper surface is provided with the guide pressing plate seat, and the guide pressing plate seat is installed with the guide pressing plate, and the lower surface of left half mould and right half mould is provided with the guide slider in the corresponding position, and the guide slider is matched with the guide pressing plate, and when closing mould, the guide slider inserts the inside of guide pressing plate, the parting surface of left half mould is equipped with horizontal boss and vertical convex strip, and the parting surface of right half mould is equipped with the horizontal recess of cooperation with horizontal boss in the corresponding position and the vertical clamping slot of cooperation with vertical convex strip. The whole mould does not need to rely on external compression iron or hydraulic locking device, and can complete stable closure only by relying on self structure and equipment clamping force, simplifies the operation procedure, reduces the demand of manual intervention, the structure design is reasonable, and the cooperation of parts is close, can adapt to the casting equipment of only having left and right mold opening mechanism, and the transformation cost is low, and the maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of left and right half mold closing, specifically relating to a metal mold with a self-locking closing structure. Background Technology

[0002] In the casting production of aluminum alloy parts, metal molds are widely used in mass production scenarios as reusable forming tools. A typical metal mold consists of three parts: a left half, a right half, and a bottom mold. Parting and closing are achieved through a horizontal opening and closing mechanism. Positioning pins or guide grooves are typically used between molds to ensure mold closing accuracy; some structures also incorporate wear-resistant sliders and guide components to reduce assembly friction and extend service life. These molds primarily rely on the clamping force provided by the casting equipment to maintain their closed state, and during the pouring process, mechanical locking devices or external pressure plates prevent them from lifting.

[0003] However, in casting equipment equipped only with left and right mold opening mechanisms but lacking upper mold clamping functions, the mold is prone to "half-mold lifting" during pouring due to the impact force of molten metal and solidification expansion force, leading to defects such as burrs and dimensional deviations in the casting. Simultaneously, the parting surface between the left and right mold halves lacks an effective self-locking structure, making it prone to misalignment or separation under lateral pressure, affecting sealing and product consistency. Existing technologies generally suppress mold lifting by manually adding pressure irons or auxiliary locking devices, but this method is cumbersome, results in uneven force distribution, and is difficult to adapt to the needs of continuous production. Furthermore, the lack of a composite interlocking structure at the parting surface, relying solely on planar contact or simple locating pins for limitation, cannot effectively resist expansion forces, hindering the stable production of high-precision castings. Summary of the Invention

[0004] The purpose of this utility model is to overcome the problem that in existing casting equipment with only left and right mold opening mechanisms and no upper clamping device, the metal mold is prone to "half-mold lifting" and "left and right parting surfaces separating" during the pouring process due to the impact force of molten metal and solidification expansion force, resulting in defects such as large gaps and dimensional deviations in the castings, which affects the product qualification rate. The present invention provides a metal mold with a self-locking mold closing structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a metal mold with a self-locking mold closing structure, including a bottom mold, a left half mold and a right half mold; guide pressure plate seats are provided on the upper surfaces of both sides of the bottom mold, and guide pressure plates are installed on the guide pressure plate seats; Guide sliders are provided at corresponding positions on the lower surfaces of the left and right half molds. The guide sliders are matched with the guide pressure plates. When the mold is closed, the guide sliders are inserted into the guide pressure plates. The left half mold parting surface is provided with a horizontal boss and a vertical protrusion, and the right half mold parting surface is provided with a horizontal groove that mates with the horizontal boss and a vertical slot that mates with the vertical protrusion.

[0006] A further improvement of this utility model is that the guide pressure plate seat and the bottom mold are integrally cast structures.

[0007] A further improvement of this utility model is that guide slider seats are provided on the lower surfaces of both the left and right half molds, and guide sliders are provided on the guide slider seats by means of bolt connection.

[0008] A further improvement of this utility model is that the bottom mold is provided with a first bottom mold slider, a second bottom mold slider, and a bottom mold guide slider; the first bottom mold slider and the second bottom mold slider are located on both sides of the bottom mold guide slider.

[0009] A further improvement of this utility model is that a bottom mold positioning platform is provided at the center of the upper surface of the bottom mold, and the bottom mold guide slider is located on the horizontal plane on both sides of the bottom mold positioning platform and is arranged symmetrically along the transverse direction of the bottom mold.

[0010] A further improvement of this utility model is that a half-mold guide block matching the bottom guide slider is installed at the middle position of the bottom of the left half-mold and the right half-mold.

[0011] A further improvement of this utility model is that the guide plate is made of high-chromium cast iron or hard alloy.

[0012] A further improvement of this utility model is that the bottom mold is made of QT500-7 ductile iron.

[0013] A further improvement of this utility model is that the left half mold is made of QT500-7 ductile iron; the right half mold is made of QT500-7 ductile iron.

[0014] A further improvement of this utility model is that the clearance between the guide slider and the guide pressure plate is 0.05~0.2mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a metal mold with a self-locking mold closing structure. By setting clamping assemblies consisting of guide pressure plate seats and guide pressure plates on both sides of the bottom mold, and setting guide sliders at corresponding positions on the lower surfaces of the left and right half molds, the guide sliders insert into the guide pressure plates during mold closing. Utilizing the existing left and right clamping forces of the equipment, vertical self-locking is achieved, effectively preventing the "half mold lifting" phenomenon caused by mold expansion during casting. Simultaneously, a fitting structure of horizontal bosses and horizontal grooves, and vertical protrusions and vertical slots is respectively set on the parting surfaces of the left and right half molds, forming horizontal and vertical... The rigid self-locking mechanism in all directions significantly enhances the sealing performance of the parting surface, preventing lateral overflow of molten metal and eliminating defects such as flash and misalignment in castings. The entire mold does not rely on external pressure irons or hydraulic locking devices; it can achieve stable closure solely through its own structure and the clamping force of the equipment, simplifying the operation process and reducing the need for manual intervention. The structure is rationally designed with tight fit between components, making it compatible with existing casting equipment that only has left and right mold opening mechanisms. It has low modification costs and is easy to maintain. In actual production, it has been verified that the flash thickness of castings can be controlled within 0.5mm, and the dimensional tolerances meet the CT8 grade requirements in GB / T 6414-2022. It has good engineering application prospects and promotion value.

[0016] Furthermore, the bottom mold guide slider and the half mold guide block work together, combined with the bottom mold positioning table's limiting function, to improve mold closing accuracy. Attached Figure Description

[0017] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components of the present invention.

[0018] Figure 1 This is a front view schematic diagram of the left half mold and the bottom mold fitting together; Figure 2 This is a schematic diagram of the rear view structure of the half mold and the bottom mold in conjunction; Figure 3 This is a schematic diagram of the front view of the bottom mold structure; Figure 4 A schematic diagram of the left and right half-model structures viewed from below. Figure 5 This is a frontal view of the structure where the right half mold and the bottom mold fit together.

[0019] The components are: 1. Left half mold; 2. Horizontal boss; 3. Guide pressure plate; 4. Guide pressure plate seat; 5. First bottom mold slider; 6. Bottom mold; 7. Bottom mold guide slider; 8. Second bottom mold slider; 9. Guide slider seat; 10. Guide slider; 11. Right half mold; 12. Vertical protrusion; 13. Half mold guide block; 14. Bottom mold positioning platform; 15. Slider; 16. Vertical slot; 17. Horizontal groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: like Figures 1 to 5 As shown, this utility model provides a metal mold with a self-locking mold closing structure. It eliminates the need to modify existing casting equipment that only has left and right mold opening mechanisms. Functional upgrades can be achieved simply by optimizing the mold's own structure, enabling autonomous prevention of left and right mold lifting, double self-locking of the parting surface, preventing separation of the left and right molds, and ensuring the dimensional accuracy of the castings. This metal mold with a self-locking mold closing structure includes a bottom mold 6, a left half mold 1, and a right half mold 11. Guide pressure plate seats 4 are provided on the upper surfaces of both sides of the bottom mold 6, and guide pressure plates 3 are installed on the guide pressure plate seats 4. Guide sliders 10 are provided at corresponding positions on the lower surfaces of the left half mold 1 and the right half mold 11. The guide sliders 10 match the guide pressure plates 3, and when the mold closes, the guide sliders 10 are inserted into the guide pressure plates 3. The parting surface of the left half mold 1 has a horizontal boss 2 and a vertical protrusion 12. The parting surface of the right half mold 11 has a horizontal groove 17 that cooperates with the horizontal boss 2 and a vertical slot 16 that cooperates with the vertical protrusion 12.

[0027] The mold is integrally cast from QT500-7 ductile iron, possessing excellent mechanical strength and resistance to thermal fatigue. The bottom mold 6 is formed using a vertical sand casting process. The guide plate seat 4 is integrally formed on both upper surfaces of the bottom mold 6 during the casting stage, and its installation plane flatness is ensured to be ≤0.05 mm through machining. The guide plate 3 is made of high-chromium cast iron, and after quenching and tempering, its surface hardness reaches HRC48~52. It is fixed to the guide plate seat 4 with bolts for easy disassembly and replacement. The left half mold 1 and right half mold 11 have guide sliders 10 on their bottom outer sides. These sliders have a T-shaped cross-section and form an interference fit with the inner cavity of the guide plate 3, with a clearance controlled at 0.08 mm. During mold closing, the left half mold 1 and right half mold 11 move downwards vertically, causing the guide sliders 10 to fully embed into the guide plate 3. Under the clamping force of the equipment, vertical clamping is achieved, preventing lifting.

[0028] In some embodiments, the guide plate seat 4 and the bottom mold 6 are integrally cast structures. The guide plate seat 4, as part of the bottom mold 6, is integrally cast with the bottom mold during the mold manufacturing stage. The material is QT500-7 ductile iron, and it is cast as a single unit to avoid residual stress and connection defects caused by subsequent welding or assembly.

[0029] In some embodiments, guide slider seats 9 are provided on the lower surfaces of both the left half mold 1 and the right half mold 11. Guide sliders 10 are provided on the guide slider seats 9 by means of bolt connection, which realizes the detachable installation of guide sliders 10 and facilitates replacement after wear.

[0030] In some embodiments, the bottom mold 6 is provided with a first bottom mold slider 5, a second bottom mold slider 8, and a bottom mold guide slider 7; the first bottom mold slider 5 and the second bottom mold slider 8 are located on both sides of the bottom mold guide slider 7. The first bottom mold slider 5 and the second bottom mold slider 8 are respectively installed on the planes near the edges at both ends of the bottom mold 6, for contacting the corresponding slider surfaces at the bottom of the left half mold 1 and the right half mold 11, forming a wear-resistant pair; the bottom mold guide slider 7 is located in the middle area of ​​the bottom mold 6, for guiding the half molds into longitudinal position.

[0031] In some embodiments, a bottom mold positioning platform 14 is provided at the center of the upper surface of the bottom mold 6, and bottom mold guide sliders 7 are located on the horizontal planes on both sides of the bottom mold positioning platform 14, arranged symmetrically along the transverse direction of the bottom mold 6. The bottom mold positioning platform 14 controls the mold closing termination position to prevent overpressure damage to the cavity; the bottom mold guide sliders 7 are arranged independently on both sides, which retains the guiding function and avoids the space occupation of the positioning platform, achieving structural coordination and coexistence.

[0032] In some embodiments, a half-mold guide block 13 matching the bottom guide slider 7 is installed at the middle position of the bottom of the left half-mold 1 and the right half-mold 11. This is used to achieve longitudinal centering and precise positioning during the mold closing process, which improves the mold closing alignment accuracy, reduces human intervention, effectively avoids defects such as aluminum leakage and casting defects caused by incorrect molds, and improves product consistency and production efficiency.

[0033] In some embodiments, the guide plate 3 is made of high-chromium cast iron or hard alloy, which extends the service life of the guide plate 3, reduces the frequency of replacement, ensures smooth insertion, and improves the overall operational reliability of the mold.

[0034] In some embodiments, the left half mold 1, the right half mold 11, and the bottom mold 6 are all made of QT500-7 ductile iron, which has excellent comprehensive mechanical properties, can reduce demolding resistance, and reduce casting scratches and surface defects.

[0035] In some embodiments, the clearance between the guide slider 10 and the guide pressure plate 3 is 0.05~0.2mm to ensure smooth insertion and reliable locking.

[0036] How to use: When installing the metal mold with the self-locking mold-closing structure, firstly, the wear-resistant guide pressure plate 3 on the side of the bottom mold 6 is removed from the guide pressure plate seat 4 to provide space for the assembly of the left half mold 1 and the right half mold 11 with the bottom mold 6; then, the left half mold 1 and the right half mold 11 are aligned with the two sides of the bottom mold 6 respectively, and lowered smoothly in the vertical direction so that the guide slider 10 at the bottom can be smoothly inserted into the corresponding area on the bottom mold 6, and the initial positioning of the left half mold 1, the right half mold 11 and the bottom mold 6 is completed; then, the removed wear-resistant guide pressure plate 3 is reinstalled on the guide pressure plate seat 4 and tightened with bolts to form a complete clamping assembly; finally, the assembled mold is hoisted into the casting equipment, and the clamping force is applied by the left and right mold opening mechanism of the equipment to achieve stable closure between the various parts of the mold. During the mold closing process, the parting surfaces of the left half mold 1 and the right half mold 11 gradually fit together. The horizontal boss 2 is embedded in the horizontal groove 17, and the vertical protrusion 12 is inserted into the vertical slot 16, forming a double mechanical lock. At the same time, the guide slider 10 is precisely embedded in the inner cavity of the wear-resistant guide pressure plate 3 during the downward phase of mold closing. With the help of the equipment clamping force, it is converted into a vertical pressing action, which effectively prevents the mold lifting phenomenon caused by the impact of molten metal and solidification expansion during pouring. The entire system does not require the use of external pressure irons or hydraulic locking devices. It can achieve reliable closure by relying solely on the structure of the mold itself. It is easy to operate, highly safe, and has good repeatability. Actual production verification shows that the thickness of the flash of the casting is controlled within 0.5 mm, and the dimensional tolerance meets the CT8 grade requirements in GB / T 6414-2022. It is suitable for the continuous production of large batches and high-precision aluminum alloy castings.

[0037] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed utility model subject matter.

[0038] The above content provides a further detailed description of this utility model. It should not be considered that the specific embodiments of this utility model are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the scope of protection of this utility model as defined by the submitted claims.

Claims

1. A metal mold with a self-locking closing structure, characterized in that, It includes a bottom mold (6), a left half mold (1) and a right half mold (11); the bottom mold (6) has guide pressure plate seats (4) on both sides of its upper surface, and guide pressure plates (3) are installed on the guide pressure plate seats (4); Guide sliders (10) are provided at corresponding positions on the lower surfaces of the left half mold (1) and the right half mold (11). The guide sliders (10) are matched with the guide pressure plate (3). When the mold is closed, the guide sliders (10) are inserted into the guide pressure plate (3). The parting surface of the left half mold (1) is provided with a horizontal boss (2) and a vertical protrusion (12), and the parting surface of the right half mold (11) is provided with a horizontal groove (17) that cooperates with the horizontal boss (2) and a vertical slot (16) that cooperates with the vertical protrusion (12).

2. The metal mold with a self-locking clamping structure according to claim 1, characterized in that, The guide plate seat (4) and the bottom mold (6) are integrally cast structures.

3. The metal mold with a self-locking clamping structure according to claim 1, characterized in that, The lower surfaces of the left half mold (1) and the right half mold (11) are provided with guide slider seats (9), and guide sliders (10) are provided on the guide slider seats (9) by means of bolt connection.

4. A metal mold with a self-locking clamping structure according to claim 1, characterized in that, The bottom mold (6) is provided with a first bottom mold slider (5), a second bottom mold slider (8) and a bottom mold guide slider (7); the first bottom mold slider (5) and the second bottom mold slider (8) are located on both sides of the bottom mold guide slider (7).

5. A metal mold with a self-locking closing structure according to claim 4, characterized in that, A bottom mold positioning platform (14) is provided at the center of the upper surface of the bottom mold (6), and the bottom mold guide slider (7) is located on the horizontal plane on both sides of the bottom mold positioning platform (14) and is arranged symmetrically along the bottom mold (6).

6. A metal mold with a self-locking clamping structure according to claim 5, characterized in that, The left half mold (1) and the right half mold (11) are equipped with half mold guide blocks (13) that match the bottom mold guide slider (7) at the middle position of the bottom.

7. A metal mold with a self-locking clamping structure according to claim 1, characterized in that, The guide plate (3) is made of high-chromium cast iron or hard alloy.

8. A metal mold with a self-locking closing structure according to claim 1, characterized in that, The bottom mold (6) is made of QT500-7 ductile iron.

9. A metal mold with a self-locking clamping structure according to claim 1, characterized in that, The left half mold (1) is made of QT500-7 ductile iron; the right half mold (11) is made of QT500-7 ductile iron.

10. A metal mold with a self-locking clamping structure according to claim 1, characterized in that, The clearance between the guide slider (10) and the guide pressure plate (3) is 0.05~0.2mm.

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