Flow channel sand core mold with multi-core-pulling structure

Abstract

This utility model relates to a flow channel sand core mold with a multi-core-pulling structure, including a moving mold and a fixed mold. The moving mold is equipped with a first cylinder and a second cylinder. The output end of the first cylinder is connected to a first core puller, and the output end of the second cylinder is connected to a guide slider, the lower side of which is connected to a second core puller. The second core puller is used to cooperate with the first core puller at the same horizontal level through a concave-convex structure to form the tongue of the press-shell sand core. The flow channel sand core mold is equipped with an upper insert, the outer circumference of which is used to form the inner circumferential surface of the press-shell sand core volute. A lower insert is provided at the bottom of the upper insert, which is used to form part of the lower side surface of the press-shell sand core volute. The upper insert has a first guide groove closed at both ends, which is used to guide and limit the movement of the guide slider. The lower insert has a guide channel with one open end, corresponding vertically to the first guide groove and extending in the same direction, which is used to guide the movement of the first core puller. This utility model solves the adverse effects on production caused by incomplete core pulling.

Description

Technical Field

[0001] This utility model relates to the field of sand core preparation mold technology, and in particular to a flow channel sand core mold with a multi-core pulling structure. Background Technology

[0002] For compressor housings with bypass valves, due to the parting line effect of the sand core, if the tongue position (including the bypass valve position) is difficult to demold without additional support, a movable block or core-pulling mechanism is required to ensure smooth demolding of the sand core. For more complex runner sand core structures, multiple core-pulling mechanisms are generally used. Due to the fit clearance between the core pullers, there is a risk of incomplete core pulling, increasing debugging time and scrap rate, which is approximately 40%-50%. Furthermore, due to the structure of the mold's injection port, some core-pulling cylinders need to be embedded in the mold. Since the temperature of the guide slider connected to the cylinder output end is around 230℃, the cylinder is prone to damage due to insufficient heat dissipation, increasing the replacement rate of spare parts and production costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a flow channel sand core mold with a multi-core pulling structure. The purpose is to solve the problem in existing technologies where the core pulling is not in place due to the gap between the core pullers, resulting in increased debugging time and product scrap rate by optimizing the fit structure between the core pullers.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A flow channel sand core mold with a multi-core pulling structure includes a moving mold and a fixed mold. The moving mold is equipped with a first cylinder and a second cylinder. The output end of the first cylinder is connected to a first core puller, and the output end of the second cylinder is connected to a guide slider, the lower side of which is connected to a second core puller. The second core puller is used to cooperate with the first core puller at the same horizontal height through a concave-convex structure to form the tongue of the press shell sand core.

[0006] The flow channel sand core mold is provided with an upper insert, the outer circumference of which is used to form the inner circumferential surface of the pressure shell sand core volute.

[0007] The lower insert is provided at the bottom of the upper insert, which is used to form part of the lower side of the volute of the press-shell sand core.

[0008] The upper insert has a first guide groove closed at both ends, which is used to guide and limit the movement of the guide slider; the lower insert has a guide channel with one end open, corresponding to the first guide groove and extending in the same direction, which is used to guide the movement of the first core puller.

[0009] The preferred technical solution is as follows:

[0010] The first core-pulling end has a concave surface with a groove, and the second core-pulling end has a convex surface that mates with the concave surface with a protrusion that mates with the groove.

[0011] The concave surface is provided with a first forming surface and a mating surface on both sides. The first forming surface is used to form the outer side of the tongue, and the mating surface is used to mate with the lower insert. The outer side of the convex surface is provided with a second forming surface, which is used to form the inner side of the tongue.

[0012] The moving directions of the first and second core pullers form an angle.

[0013] The moving mold is provided with two air ducts. The air inlets of the two air ducts are connected to an external cooling air source, and the air outlets are respectively connected to the two sides of the slide groove in the moving mold used for positioning and guiding the guide slider.

[0014] The first cylinder is located in the receiving cavity inside the moving mold. A cooling component is provided on the outside of the first cylinder, and a heat insulation component is provided between its inner wall and the outer wall of the first cylinder. The cooling component is an air-cooled component.

[0015] The cooling component is U-shaped and surrounds the three sides of the first cylinder; the cooling component is provided with air-cooling channels.

[0016] The moving mold is provided with a cover plate on its outer side, which encloses the first cylinder in the receiving cavity.

[0017] The moving mold is also equipped with a third cylinder, a fourth cylinder and a fifth cylinder;

[0018] The output end of the third cylinder is connected to the third core puller, and the output end of the fourth cylinder is connected to the fourth core puller. The third core puller and the fourth core puller are matched at the same horizontal height to form a forming surface for forming the outer side of the volute portion of the pressure shell sand core.

[0019] The fifth cylinder output end is connected to the fifth core puller. The fifth core puller slides along the second guide groove at the bottom of the lower insert and can cooperate with the third core puller at the same horizontal height to form a forming surface for forming the area where the pressure shell sand core volute part connects with the exhaust pipe.

[0020] The second guide groove is arranged parallel to the guide channel vertically and extends in different directions. One end of the second guide groove is open and the other end is closed, which is used to limit the stroke of the fifth core puller.

[0021] The technical solution of this utility model can achieve at least some of the following beneficial effects:

[0022] This invention improves the molding quality of the tongue area of ​​the pressure shell sand core by improving the installation structure of the second core puller and the mating surface between the second core puller and the first core puller.

[0023] This invention improves the stability of core-pulling operations through the air duct design in the moving mold and the cooling treatment of the first cylinder inside the mold. It prevents core-pulling jamming and the impact of high temperatures on production, further ensuring proper core-pulling and mold closing, and improving the stability and service life of the device. Compared with traditional runner sand core molds, damage to the core-pulling cylinder is significantly reduced during the mold maintenance cycle. This greatly saves time on cylinder replacement, increases production efficiency and capacity, and reduces production costs.

[0024] This invention achieves high-quality molding of complex press-shell sand cores through the arrangement of five cylinders and the corresponding core pulling mechanism.

[0025] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0027] Figure 2 for Figure 1 The main view after the cover plate is hidden.

[0028] Figure 3 This is a schematic diagram of the structure of this utility model embodiment with the first moving mold hidden.

[0029] Figure 4 This is a schematic diagram of the first core puller, the second core puller, and the upper and lower inserts in an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the main structure of the sand core to be formed according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the first core-pulling structure according to an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of the assembly structure of the guide slider and the second core puller according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the air duct arrangement structure in the first moving mold of this utility model embodiment.

[0034] Figure 9 This is a schematic diagram of the structure after the mold is removed in an embodiment of this utility model.

[0035] Figure 10 This is a schematic diagram of the structure of the lower insert in an embodiment of the present invention.

[0036] Figure 11This is a schematic diagram showing the positions of the pressed shell sand core, the third core puller, and the fifth core puller after molding in an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached drawings: 1. Moving mold one; 2. Moving mold two; 3. Cover plate; 4. Shot nozzle; 5. Fixed mold; 6. Cooling component; 7. First cylinder; 8. Heat insulation component; 9. Fifth cylinder; 10. Second cylinder; 11. Fourth cylinder; 12. Third cylinder; 13. Upper insert; 14. Second core pull; 15. First core pull; 16. Guide block; 17. Third core pull; 18. Fourth core pull; 19. Lower insert; 20. Press shell sand core; 21. Fifth core pull; 101. Air duct; 131. First guide groove; 141. Molding surface two; 142. Protrusion; 151. Molding surface one; 152. Groove; 153. Mating surface; 191. Guide channel; 192. Second guide groove; 201. Tongue; 1011. Air outlet. Detailed Implementation

[0038] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0039] See Figures 1 to 5 The flow channel sand core mold with multi-core pulling structure in this embodiment includes a moving mold and a fixed mold 5. The moving mold is provided with a first cylinder 7 and a second cylinder 10. The output end of the first cylinder 7 is connected to the first core pull 15. The output end of the second cylinder 10 is connected to a guide slider 16, and the lower side of the guide slider 16 is connected to a second core pull 14. The second core pull 14 is used to cooperate with the first core pull 15 at the same horizontal height through a concave-convex structure to form the tongue 201 of the pressure shell sand core 20.

[0040] The flow channel sand core mold is provided with an upper insert 13, the outer circumference of which is used to form the inner circumferential surface of the volute of the pressure shell sand core 20.

[0041] The bottom of the upper insert 13 is provided with a lower insert 19, which is used to form part of the lower side of the volute of the pressure shell sand core 20.

[0042] The upper insert 13 has a first guide groove 131 closed at both ends, which is used to guide and limit the movement of the guide slider 16; the lower insert 19 has a guide channel 191 with one end open, corresponding to the first guide groove 131 and extending in the same direction, which is used to guide the movement of the first core puller 15.

[0043] See Figure 6 , Figure 7 As a preferred embodiment, the first core puller 15 has a concave surface at its end with a groove 152 thereon, and the second core puller 14 has a convex surface at its end that mates with the concave surface with a protrusion 142 thereon that mates with the groove 152.

[0044] As a preferred embodiment, the concave surface is provided with a forming surface 151 and a mating surface 153 on both sides. The forming surface 151 is used to form the outer side of the tongue 201, and the mating surface 153 is used to mate with the lower insert 19. The outer side of the convex surface is provided with a forming surface 141, which is used to form the inner side of the tongue 201.

[0045] This embodiment utilizes a guide slider to create a second core puller with a lower height, which satisfies the movement requirements of the second core puller while preventing damage to the molding surface of the upper insert. Because the second core puller and the guide slider have different heights, and the guide slider is connected to the output end of the second cylinder (i.e., the output end of the second cylinder and the second core puller are not coaxial), the second core puller is prone to "tilting" and causing misalignment. Therefore, this embodiment uses a concave-convex fit between the first and second core pullers to prevent tilting, while also improving the precision of the fit and reducing the clearance. This allows the core puller to accurately reach the preset position under cylinder drive, improving the quality of the sand core molding.

[0046] Specifically, the moving directions of the first core puller 15 and the second core puller 14 form an angle.

[0047] Specifically, based on the structure of the sand core to be formed and the mold structure, the moving mold in this embodiment includes a moving mold 1 located on the upper side and a moving mold 2 located between the moving mold 1 and the fixed mold 5.

[0048] See Figure 8 As a preferred embodiment, the moving mold is provided with two air ducts 101. The air inlets of the two air ducts 101 are connected to an external cooling air source, and the air outlets 1011 are respectively connected to the two sides of the slide groove of the guide slider 16 used for positioning and guiding in the moving mold.

[0049] The blowing through the air duct 101 serves two purposes: firstly, it cleans the grooves of the guide slider 16 used for positioning and guiding in the moving mold, removing residual sand and preventing the second core puller 14 from jamming. Secondly, the blowing with cold air reduces the temperature of the guide slider 16 during operation, preferably from 230°C to 180°C, to prevent thermal expansion from causing the core puller to jam and fail to engage properly. It also prevents the second cylinder 10 from overheating.

[0050] Specifically, because the mounting side of the first cylinder 7 is equipped with, for example, Figure 2 To avoid interference, the first cylinder 7 in this embodiment is located in the receiving cavity inside the moving mold. A cooling component 6 is provided on the outside of the first cylinder 7, and a heat insulation component 8 is provided between its inner wall and the outer wall of the first cylinder 7. The cooling component 6 is an air-cooled component.

[0051] As a preferred embodiment, the cooling component 6 is U-shaped and surrounds the three sides of the first cylinder 7; the cooling component 6 is provided with air-cooling channels. Through the air-cooling effect of the cooling component 6, the temperature of the first cylinder 7 inside the mold can be reduced, thus reducing losses.

[0052] Specifically, a cover plate 3 is provided on the outside of the moving mold, which encloses the first cylinder 7 in the receiving cavity.

[0053] As a preferred method, see Figures 9 to 11 The moving mold is also equipped with a third cylinder 12, a fourth cylinder 11 and a fifth cylinder 9;

[0054] The output end of the third cylinder 12 is connected to the third core puller 17, and the output end of the fourth cylinder 11 is connected to the fourth core puller 18. The third core puller 17 and the fourth core puller 18 are matched at the same horizontal height to form a forming surface for forming the outer side of the volute part of the sand core 20.

[0055] The output end of the fifth cylinder 9 is connected to the fifth core puller 21. The fifth core puller 21 slides along the second guide groove 192 at the bottom of the lower insert 19, and can cooperate with the third core puller 17 at the same horizontal height to form a forming surface for molding the area where the volute part of the molding core 20 connects with the exhaust pipe. Figure 11 As shown.

[0056] like Figure 10 As shown, the second guide groove 192 is arranged parallel to the guide channel 191 vertically and extends in different directions. One end of the second guide groove 192 is open and the other end is closed, which is used to limit the stroke of the fifth core puller 21.

[0057] This embodiment improves the forming quality of the tongue area of ​​the most difficult-to-form sand core by improving the installation structure of the second core puller and the mating surface between the second and first core pullers. Furthermore, the design of the air duct in the moving mold and the cooling treatment of the first cylinder within the mold improve the stability of the core pulling operation, preventing jamming and high temperatures from affecting production, thus increasing the stability and service life of the device. Moreover, this embodiment achieves high-quality forming of complex sand cores through the cooperation of five cylinders and their corresponding core pullers.

[0058] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flow channel sand core mold with a multi-core-pulling structure, comprising a moving mold and a fixed mold (5), characterized in that, The moving mold is provided with a first cylinder (7) and a second cylinder (10). The output end of the first cylinder (7) is connected to a first core puller (15), and the output end of the second cylinder (10) is connected to a guide slider (16), and the lower side of the guide slider is connected to a second core puller (14). The second core puller (14) is used to cooperate with the first core puller (15) at the same horizontal height through a concave-convex structure to form the tongue (201) of the pressure shell sand core (20). The flow channel sand core mold is provided with an upper insert (13), the outer circumference of which is used to form the inner circumferential surface of the volute of the press shell sand core (20); The lower insert (19) is provided at the bottom of the upper insert (13), which is used to form part of the lower side of the volute of the press shell sand core (20); The upper insert (13) is provided with a first guide groove (131) closed at both ends, which is used to guide and limit the movement of the guide slider (16); the lower insert (19) is provided with a guide channel (191) with one end open, corresponding to the first guide groove (131) and extending in the same direction, which is used to guide the movement of the first core puller (15).

2. The flow channel sand core mold with a multi-loft structure according to claim 1, characterized in that, The first core puller (15) has a concave surface at its end, and a groove (152) thereon. The second core puller (14) has a convex surface at its end that mates with the concave surface, and a protrusion (142) thereon that mates with the groove (152).

3. The flow channel sand core mold with a multi-loft structure according to claim 2, characterized in that, The concave surface is provided with a first forming surface (151) and a mating surface (153) on both sides. The first forming surface (151) is used to form the outer side of the tongue (201), and the mating surface (153) is used to mate with the lower insert (19). The outer side of the convex surface is provided with a second forming surface (141), which is used to form the inner side of the tongue (201).

4. The flow channel sand core mold with a multi-lofting structure according to claim 1, characterized in that, The moving directions of the first core puller (15) and the second core puller (14) form an angle.

5. The flow channel sand core mold with multi-lofting structure according to claim 1, characterized in that, The moving mold is provided with two air ducts (101). The air inlets of the two air ducts (101) are connected to an external cooling air source, and the air outlets (1011) are respectively connected to both sides of the slide groove in the moving mold used for positioning and guiding the guide slider (16).

6. The flow channel sand core mold with multi-lofting structure according to claim 1, characterized in that, The first cylinder (7) is located in the cavity inside the moving mold. A cooling component (6) is provided on the outside of the first cylinder (7), and a heat insulation component (8) is provided between its inner wall and the outer wall of the first cylinder (7). The cooling component (6) is an air-cooled component.

7. The flow channel sand core mold with multi-lofting structure according to claim 6, characterized in that, The cooling component (6) is U-shaped and surrounds the three sides of the first cylinder (7); the cooling component (6) is provided with an air-cooling channel.

8. The flow channel sand core mold with multi-core pulling structure according to claim 6, characterized in that, The moving mold is provided with a cover plate (3) on the outside, which encloses the first cylinder (7) in the receiving cavity.

9. The flow channel sand core mold with multi-lofting structure according to claim 1, characterized in that, The moving mold is also equipped with a third cylinder (12), a fourth cylinder (11) and a fifth cylinder (9); The output end of the third cylinder (12) is connected to the third core puller (17), and the output end of the fourth cylinder (11) is connected to the fourth core puller (18). The third core puller (17) and the fourth core puller (18) are fitted at the same horizontal height to form a forming surface for forming the outer side of the volute portion of the pressure shell sand core (20). The output end of the fifth cylinder (9) is connected to the fifth core puller (21). The fifth core puller (21) slides along the second guide groove (192) at the bottom of the lower insert (19) and can cooperate with the third core puller (17) at the same horizontal height to form a forming surface for forming the area where the volute part of the pressure shell sand core (20) connects with the exhaust pipe.

10. The flow channel sand core mold with multi-lofting structure according to claim 9, characterized in that, The second guide groove (192) is arranged parallel to the guide channel (191) and extends in different directions. One end of the second guide groove (192) is open and the other end is closed, which is used to limit the stroke of the fifth core puller (21).

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