A sand core forming mold

Abstract

The utility model belongs to foundry mould technical field especially is related to a sand core forming mould, this mould includes lower forming mould, upper forming mould, lower forming mould and upper forming mould are opened with the first parting cavity and second parting cavity of fixed interval distribution respectively, side mould is connected by the circular cavity sliding of first arc slot and second arc slot constitution, realizes accurate positioning by driving cylinder to push side plate, heating system includes the first electric heating tube of setting in heating mould base and the second electric heating tube in upper forming mould, surrounds the cavity and is annular distribution, demoulding system realizes automatic demoulding through the control demoulding ejector pin of hydraulic drive device, reset spring ensures system reset, this mould can complete three differential mechanism shell sand core's synchronous forming one time, realizes temperature even heating through annular distribution's electric heating tube, compared with traditional single sand core forming mould, has improved production efficiency, sand core solidification quality is stable and consistent, has improved differential mechanism shell sand core's batch production capacity.

Description

Technical Field

[0001] This utility model belongs to the field of casting mold technology, and in particular relates to a sand core forming mold. Background Technology

[0002] In the manufacturing process of automotive transmission systems, the differential housing, as a key cast component, has a complex internal structure that requires the use of sand cores to form its internal cavity. Traditional sand core forming processes typically use a single sand core forming mold, which can only form one sand core at a time, resulting in low production efficiency and failing to meet the needs of mass production.

[0003] Traditional sand core molding molds also suffer from inconsistent mold temperature distribution, which affects the curing quality and dimensional accuracy of the sand cores. Furthermore, the number of sand cores that can be molded at one time is limited, requiring multiple operations to complete all the sand cores needed for a set of differential housings, thus reducing production efficiency. Utility Model Content

[0004] In view of the technical problems existing in the background art, this utility model provides a sand core forming mold.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A sand core forming mold includes a lower forming mold and an upper forming mold. The lower forming mold has several first parting cavities with fixed spacing inside, and the upper forming mold has several second parting cavities inside. Several symmetrically arranged first arc-shaped grooves are formed on both sides of the lower forming mold, and several second arc-shaped grooves corresponding to the first arc-shaped grooves are also formed on both sides of the upper forming mold. Side molds are slidably connected in the circular cavities formed by the several first arc-shaped grooves and second arc-shaped grooves. A side plate is fixedly connected to the outer end of the side mold, and a drive cylinder is fixedly connected to the outer end of the side plate. A mounting plate is fixedly connected to the outer end of the drive cylinder, and a bottom plate is fixedly connected to the bottom end of the mounting plate. The top end of the bottom plate is fixedly connected to the bottom end of the lower forming mold. The first parting cavities, the second parting cavities, and the side molds constitute a cavity for forming a sand core.

[0006] Optionally, the top of the upper forming mold is provided with a heating mold base, and the heating mold base has a plurality of symmetrically arranged first through holes, each of which is provided with a first electric heating tube. The upper forming mold has a plurality of symmetrically arranged second through holes, each of which is provided with a second electric heating tube, and the plurality of first electric heating tubes and second electric heating tubes are arranged in a ring around the cavity.

[0007] Optionally, T-slots are provided at both ends of the heating mold base, and fastening bolts are engaged in the T-slots. The heating mold base is fixedly connected to the upper forming mold through the fastening bolts.

[0008] Optionally, the top of the heating mold base is provided with several sand-shooting holes that communicate with the second parting cavity. Two symmetrically arranged guide rails are fixedly connected to the top of the heating mold base. A support rod is fixedly connected to the top of the guide rails. A first fixing plate is fixedly connected to the top of the support rod. A frame is fixedly connected to the bottom of the first fixing plate.

[0009] Optionally, a hydraulic drive device is fixedly connected to the bottom of the frame, and the top of the hydraulic drive device is provided with several hydraulic rods, the top of which is fixedly connected to the base plate.

[0010] Optionally, the top of the hydraulic drive device is fixedly connected to several positioning rods, the outer end of the hydraulic rod is slidably connected to a second fixing plate, the top of the second fixing plate is fixedly connected to a demolding ejector rod, the demolding ejector rod extends through the bottom plate to the bottom of the sand core, and the top of the second fixing plate is fixedly connected to several guide rods.

[0011] Optionally, the top of the base plate has several countersunk holes corresponding to the guide rods. The guide rods are slidably connected to the inner walls of the countersunk holes, and a return spring is slidably connected to the outer wall of the guide rods. The top of the return spring abuts against the bottom of the base plate, and the bottom of the return spring abuts against the second fixing plate.

[0012] This utility model has the following advantages and beneficial effects: This invention achieves the function of molding three sand cores at once by setting multiple parting cavities and side molds. Compared with the traditional single sand core molding method, it improves production efficiency. By setting annularly distributed electric heating tubes in the heating mold base and the upper molding mold, it ensures uniform temperature distribution of the mold and improves the curing quality of the sand cores. The arc-shaped groove sliding positioning mechanism of the side mold ensures the molding accuracy and consistency of multiple sand cores. The hydraulically driven demolding system realizes automatic demolding of the sand cores, reduces manual operation, and improves the degree of production automation. This device can complete the batch production of differential housing sand cores. Compared with the traditional single molding method, it avoids the problems of low production efficiency and uneven temperature distribution, improves production efficiency and product quality, and has good economic benefits and practical value. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of the sand core forming mold of this utility model; Figure 2 This is a partial view of the sand core forming mold of this utility model. Figure 1 ; Figure 3 This is a structural diagram of the upper forming mold of this utility model; Figure 4 This is a partial view of the sand core forming mold of this utility model. Figure 2 ; Figure 5 This is a structural diagram of the side mold of this utility model; Figure 6 This is a structural diagram of the lower molding die of this utility model; Figure 7 This is a partial view of the sand core forming mold of this utility model. Figure 3 ; Figure 8 This is a front view of the sand core forming mold of this utility model; Figure 9 This utility model Figure 8 AA section view in the middle; Figure 10 This utility model Figure 8 BB section view in the middle; Figure 11 This is a diagram showing the demolding state of the sand core of this utility model.

[0014] Reference numerals: 1. Lower forming mold; 2. Upper forming mold; 3. First parting cavity; 4. Second parting cavity; 5. First arc groove; 6. Second arc groove; 7. Side mold; 8. Side plate; 9. Drive cylinder; 10. Mounting plate; 11. Base plate; 12. Heating mold base; 1201. First through hole; 1202. First electric heating tube; 13. Second through hole; 1301. Second electric heating tube; 14. T-slot; 15. Fastening bolt; 16. Sand injection hole; 17. Guide rail; 18. Support rod; 19. First fixing plate; 20. Frame; 21. Hydraulic drive device; 22. Hydraulic rod; 23. Positioning rod; 24. Second fixing plate; 25. Ejector pin; 26. Guide rod; 27. Countersunk hole; 28. Return spring. Detailed Implementation

[0015] 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 some embodiments of this utility model, but not all embodiments.

[0016] 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.

[0017] Example like Figure 1 - Figure 6 As shown, a sand core forming mold forms a basic forming space through the cooperation of upper and lower forming molds. The side mold 7 slides and is positioned under the guidance of the arc groove, and together with the parting cavity, it forms a complete three-cavity forming system, realizing the function of forming three differential housing sand cores at one time.

[0018] The lower forming mold 1 serves as the basic structure of the mold, and its interior has several first parting cavities 3 with fixed spacing, providing forming space for the lower half of the three sand cores. The upper forming mold 2 has several second parting cavities 4, which correspond to the first parting cavities 3, ensuring accurate closure of the upper and lower cavities. The three sand cores can be formed synchronously in a single operation. The lower forming mold 1 has several symmetrically arranged first arc-shaped grooves 5 on both sides, and the upper forming mold 2 also has several second arc-shaped grooves 6 on both sides corresponding to the first arc-shaped grooves 5. The circular cavity formed by the first arc-shaped grooves 5 and the second arc-shaped grooves 6 provides a stable trajectory for the precise sliding of the side mold 7. The side mold 7 slides within the circular cavity, and the force is transmitted through the side plate 8 fixedly connected to the outer end of the side mold 7. The guiding design of the arc-shaped grooves ensures the smoothness of the movement and the positioning accuracy of the side mold 7.

[0019] A drive cylinder 9 is fixedly connected to the outer end of the side plate 8. The drive cylinder 9 provides precise power control for the sliding of the side mold 7. A mounting plate 10 is fixedly connected to the outer end of the drive cylinder 9. A base plate 11 is fixedly connected to the bottom end of the mounting plate 10. The top end of the base plate 11 is fixedly connected to the bottom end of the lower forming mold 1. The three-way cooperation of the first parting cavity 3, the second parting cavity 4 and the side mold 7 constitutes a complete three-cavity forming system, realizing the simultaneous forming of multiple sand cores.

[0020] like Figure 1 - Figure 4 As shown, the top of the upper forming mold 2 is provided with a heating mold base 12. The heating mold base 12 adopts a split design, which facilitates the installation and maintenance of the heating system. Several symmetrically arranged first through holes 1201 are opened in the heating mold base 12, and each of the several first through holes 1201 is provided with a first electric heating tube 1202. Several symmetrically arranged second through holes 13 are opened in the lower forming mold 1, and each of the several second through holes 13 is provided with a second electric heating tube 1301. The first electric heating tube 1202 and the second electric heating tube 1301 are arranged in a ring around the cavity, forming a layered heating structure, which ensures the uniform transfer of heat to the cavity. This ring heating method eliminates the problem of excessive temperature gradient caused by traditional single-point heating, so that all parts of the sand core are heated evenly and the curing quality is consistent.

[0021] Both ends of the heating mold base 12 are provided with T-slots 14, and fastening bolts 15 are engaged in the T-slots 14. The heating mold base 12 is fixedly connected to the upper forming mold 2 by the fastening bolts 15, realizing the function of quick assembly and disassembly.

[0022] The top of the heating mold base 12 is provided with several sand-shooting holes 16 that communicate with the second parting cavity 4. The sand-shooting holes 16 communicate with the second parting cavity 4. The top of the heating mold base 12 is fixedly connected to two symmetrically arranged guide rails 17. The guide rails 17 provide guidance and support for the sand-shooting mechanism. When shooting sand, the sand-shooting mechanism slides along the guide rails 17 to a predetermined position and aligns with the sand-shooting holes 16 before shooting sand. The top of the guide rails 17 is fixedly connected to a support rod 18. The top of the support rod 18 is fixedly connected to a first fixing plate 19. The bottom of the first fixing plate 19 is fixedly connected to a frame 20, which constitutes the load-bearing frame of the entire device.

[0023] like Figure 1 and Figure 7 - Figure 11 As shown, a hydraulic drive device 21 is fixedly connected to the bottom of the frame 20. The hydraulic drive device 21 realizes the opening and closing action of the mold through precise control. Several hydraulic rods 22 are provided at the top of the hydraulic drive device 21. The top of the hydraulic rods 22 is fixedly connected to the base plate 11 to ensure the stable closing of the mold during the high-pressure sand shooting process.

[0024] A plurality of positioning rods 23 are fixedly connected to the top end of the hydraulic drive device 21. A second fixing plate 24 is slidably connected to the outer end of the hydraulic rod 22. A demolding ejector rod 25 is fixedly connected to the top end of the second fixing plate 24. The demolding ejector rod 25 extends through the bottom plate 11 to the bottom end of the sand core. During demolding, the demolding ejector rod 25 can push the sand core out a certain distance to complete the demolding. A plurality of guide rods 26 are fixedly connected to the top end of the second fixing plate 24. A plurality of countersunk holes 27 corresponding to the guide rods 26 are opened at the top end of the bottom plate 11. The guide rod 26 is slidably connected to the inner wall of the countersunk hole 27, providing a guide for the demolding ejector rod 25 and preventing skewing during demolding. The countersunk hole 27 provides movement space for the guide rod 26. The outer end of the guide rod 26 is slidably connected to a return spring 28. The top of the return spring 28 abuts against the bottom end of the base plate 11, and the bottom of the return spring 28 abuts against the second fixed plate 24. After demolding, the return spring 28 pushes the base plate 11 to move downward, and the base plate 11 drives the demolding ejector rod 25 back to the initial position for the next sand core forming.

[0025] like Figure 1 - Figure 11As shown, during the sand core molding process, the hydraulic drive device 21 drives the hydraulic rod 22 to push the lower molding mold 1 to close with the stationary upper molding mold 2. At the same time, the drive cylinder 9 is controlled to push the side plates 8 on both sides to close in the middle. The side plates 8 drive the side mold 7 to slide into the circular cavity formed by the first arc groove 5 and the second arc groove 6. After closing, it forms three independent molding spaces together with the first parting cavity 3 and the second parting cavity 4. Then, several first electric heating tubes 1202 and second electric heating tubes 1301 are controlled to uniformly heat the mold temperature to the required process temperature. At the same time, the sand shooting mechanism slides along the guide rail 17 to the predetermined position, aligns with the sand shooting hole 16, and performs sand shooting. The sand material fills the three cavities at the same time through the sand shooting hole 16 and is rapidly solidified and formed under the action of the uniform temperature field provided by the first electric heating tube 1202 and the second electric heating tube 1301.

[0026] After molding is completed, the drive cylinder 9 reverses its movement to retract the side mold 7. The hydraulic drive device 21 drives the hydraulic rod 22 to move downward. The hydraulic rod 22 drives the lower molding mold 1, the side mold 7, and the base plate 11 to move downward together. At this time, the molded sand core separates from the upper molding mold 2 under the action of gravity or the action of the upper demolding rod. The sand core stays in the lower molding mold 1 and moves downward with the lower molding mold 1 to the preset position. After the second fixing plate 24 descends, it abuts against the positioning rod 23. After the second fixing plate 24 abuts against the positioning rod 23, the hydraulic rod 22 continues to drive the lower molding mold 1 to move downward. Mold 1, side mold 7, and base plate 11 move downwards together, while the second fixed plate 24 remains stationary, allowing the guide rod 26 to slide upwards within the countersunk hole 27. The return spring 28 is compressed, and the ejector pin 25 simultaneously ejects the three sand cores from the lower forming mold 1, completing the demolding process. When the next sand core forming is performed, the hydraulic drive device 21 drives the hydraulic rod 22 to push the lower forming mold 1 upwards, allowing the return spring 28 to reset and further pushing the second fixed plate 24 downwards. The guide rod 26 slides back to its original position within the countersunk hole 27, and the second fixed plate 24 drives the ejector pin 25 back to its initial position.

[0027] The entire molding process achieves simultaneous production of three sand cores, uniform heating, and automatic demolding. Compared with traditional single sand core molding, it improves production efficiency and provides effective technical support for the mass production of differential housings.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sand core forming mold, characterized in that, The device includes a lower forming mold (1) and an upper forming mold (2). The lower forming mold (1) has several first parting cavities (3) with fixed spacing inside. The upper forming mold (2) has several second parting cavities (4). The lower forming mold (1) has several symmetrically arranged first arc-shaped grooves (5) on both sides. The upper forming mold (2) has several second arc-shaped grooves (6) corresponding to the first arc-shaped grooves (5) on both sides. The several first arc-shaped grooves (5) and second arc-shaped grooves (6) constitute a [missing information]. A side mold (7) is slidably connected inside the circular cavity. A side plate (8) is fixedly connected to the outer end of the side mold (7). A driving cylinder (9) is fixedly connected to the outer end of the side plate (8). An mounting plate (10) is fixedly connected to the outer end of the driving cylinder (9). A bottom plate (11) is fixedly connected to the bottom end of the mounting plate (10). The top end of the bottom plate (11) is fixedly connected to the bottom end of the lower forming mold (1). The first parting cavity (3), the second parting cavity (4), and the side mold (7) constitute a cavity for forming a sand core.

2. The sand core forming mold according to claim 1, characterized in that: The upper forming mold (2) is provided with a heating mold base (12) at its top. The heating mold base (12) has a plurality of symmetrically arranged first through holes (1201) and a first electric heating tube (1202) in each of the plurality of first through holes (1201). The lower forming mold (1) has a plurality of symmetrically arranged second through holes (13) and a second electric heating tube (1301) in each of the plurality of second through holes (13). The plurality of first electric heating tubes (1202) and second electric heating tubes (1301) are arranged in a ring around the cavity.

3. The sand core forming mold according to claim 2, characterized in that: Both ends of the heating mold base (12) are provided with T-slots (14), and fastening bolts (15) are engaged in the T-slots (14). The heating mold base (12) is fixedly connected to the upper forming mold (2) by the fastening bolts (15).

4. A sand core forming mold according to claim 2, characterized in that: The top of the heating mold base (12) is provided with several sand-shooting holes (16) that communicate with the second parting cavity (4). The top of the heating mold base (12) is fixedly connected with two symmetrically arranged guide rails (17). The top of the guide rails (17) is fixedly connected with a support rod (18). The top of the support rod (18) is fixedly connected with a first fixing plate (19). The bottom of the first fixing plate (19) is fixedly connected with a frame (20).

5. A sand core forming mold according to claim 4, characterized in that: The bottom end of the frame (20) is fixedly connected to a hydraulic drive device (21), and the top end of the hydraulic drive device (21) is provided with a plurality of hydraulic rods (22), the top end of the hydraulic rods (22) being fixedly connected to the base plate (11).

6. A sand core forming mold according to claim 5, characterized in that: The top end of the hydraulic drive device (21) is fixedly connected with several positioning rods (23), the outer end of the hydraulic rod (22) is slidably connected with a second fixing plate (24), the top end of the second fixing plate (24) is fixedly connected with a demolding ejector rod (25), the demolding ejector rod (25) extends through the bottom plate (11) to the bottom end of the sand core, and the top end of the second fixing plate (24) is fixedly connected with several guide rods (26).

7. A sand core forming mold according to claim 6, characterized in that: The top of the base plate (11) is provided with a plurality of countersunk holes (27) corresponding to the guide rod (26). The guide rod (26) is slidably connected to the inner wall of the countersunk hole (27). A return spring (28) is slidably connected to the outer wall of the guide rod (26). The top of the return spring (28) abuts against the bottom end of the base plate (11), and the bottom of the return spring (28) abuts against the second fixing plate (24).

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