A fan motor housing for a vehicle is cast in a mold

Abstract

This invention provides a casting mold structure for an automotive fan motor housing, relating to the field of casting mold technology. It includes a lower mold plate, an upper mold plate, and a fixed mold plate. A cavity for molding the main body is formed between the upper and lower mold plates. The fixed mold plate has a sprue. The upper mold plate has connecting holes and mounting grooves. Multiple sliding rods with their ends located within the connecting holes are slidably connected within the mounting groove. A protrusion for molding a through-groove is connected to the inner wall of the upper molding groove, with one sliding rod corresponding to the position of the protrusion. A cutter for cutting off the sprue head is slidably connected to the upper mold plate. As the cutter moves towards the sprue head, a transmission mechanism causes all sliding rods to move synchronously away from the connecting holes. This application achieves simultaneous cutting of the end face gate and the molding side wall positioning recess within the mold, reducing production costs and effectively improving the phase alignment accuracy of the positioning recess and the through-groove.

Description

Technical Field

[0001] This invention relates to casting molds, and more particularly, to a casting mold structure for an automotive fan motor housing. Background Technology

[0002] Currently, in-mold automatic gate removal technology is widely used in injection molding and die casting. For example, Chinese utility model patent CN207643613U discloses a device for automatic in-mold gate removal, which includes an A-plate, a front mold core, and a rear mold core stacked on top of each other, with the front and rear mold cores together forming a product cavity. This device uses a motor installed in a receiving groove in the A-plate to drive a cam and connecting rod, which in turn moves a cutter within a through-hole up and down, thereby directly cutting off the gate directly opposite the cavity inside the mold.

[0003] However, in production such as Figure 1 and Figure 2 The automotive fan motor housing 40 shown includes a main body and a support column 41 located at the center of the main body. The end face of the support column 41 typically serves as the injection gate for die casting. Furthermore, for subsequent assembly and positioning requirements, four circumferentially distributed positioning recesses 43 need to be formed on the outer circumferential sidewall of the support column 41. Specifically, for the phase assembly requirements of the product, the position of one of the positioning recesses 43 must be aligned with the through groove 42 on the main body of the housing; that is, the positioning recess 43 must precisely fall on the centerline of the through groove 42.

[0004] Using the existing technology described in the aforementioned patent, the cutter can only perform a single vertical downward cut-off of the end face gate, and cannot simultaneously complete the forming of the four recessed holes on the side wall of the support column within the confined mold space. Therefore, traditional production processes often require first cutting off the end face gate within the mold, and then, after the product is demolded, additional secondary machining equipment and workers are needed to perform drilling and milling on the side wall of the support column. This not only significantly increases production costs, but also introduces substantial errors due to the secondary clamping and positioning. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a casting mold structure for automotive fan motor housings, which solves the technical problem that existing molds cannot simultaneously cut off the end material head and form the side positioning hole in the mold when producing automotive motor housings with circumferential side holes, resulting in high secondary machining costs and low assembly phase alignment accuracy after demolding.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a casting mold structure for an automotive fan motor housing, comprising a lower mold plate, an upper mold plate, and a fixed mold plate. The lower mold plate has a lower forming groove on the side facing the upper mold plate, and the upper mold plate has an upper forming groove on the side facing the lower mold plate. When the upper mold plate and the lower mold plate are pressed together, a cavity for forming the main body is formed between the upper and lower forming grooves. The fixed mold plate is located on the side of the upper mold plate away from the lower mold plate, and a glue inlet is provided on the fixed mold plate. The upper mold plate has a connecting hole for forming a support column, and one end of the connecting hole communicates with the glue inlet. The other end of the connecting hole is connected to the cavity. A protrusion for forming a through groove is connected to the inner wall of the upper forming groove. A cutter for cutting off the material head is slidably connected to the side of the upper template facing away from the lower template. An installation groove communicating with the connecting hole is opened on the upper template. Multiple sliding rods with their ends located in the connecting hole and used for forming positioning recesses are slidably connected in the installation groove. The multiple sliding rods are distributed circumferentially along the axis of the connecting hole, and the position of one of the sliding rods corresponds to the position of the protrusion. During the process of the cutter moving towards the material head, all the sliding rods move synchronously away from the connecting hole through the transmission mechanism.

[0007] To achieve the above technical solution, a mounting groove is opened on the upper template, and multiple sliding rods distributed circumferentially along the axis of the connecting hole are slidably connected. The position of one of the sliding rods corresponds to the position of the protrusion in the forming through groove. During the movement of the cutter towards the material head, a transmission mechanism causes all the sliding rods to move synchronously away from the connecting hole. After casting, the linear displacement of the downward movement of the cutter is used as the power source to radially pull the sliding rods, which can simultaneously complete the cutting of the material head and the forming of the positioning recess on the side wall of the support column inside the mold. This reduces the secondary machining process after product demolding and lowers production costs. At the same time, since both the sliding rods and the protrusion are on the upper template, the cumulative tolerance caused by secondary clamping is reduced, which helps to improve the assembly alignment accuracy between the positioning recess and the through groove.

[0008] In a preferred embodiment of the present invention, the transmission mechanism includes a guide groove, a guide rod, a rotating disk, and a connecting assembly. The guide groove is formed on the cutter, the rotating disk is rotatably connected to the upper template, and a connecting hole is formed at the center of the rotating disk. The connecting hole is located inside the connecting hole. The guide rod is fixed to the rotating disk and slidably connected to the guide groove. When the cutter moves towards the material head, the inner wall of the guide groove abuts against the guide rod to drive the rotating disk to rotate. When the rotating disk rotates, it drives all the sliding rods to move away from the connecting hole through the connecting assembly.

[0009] To achieve the above technical solution, when the cutter cuts the material head, the inner wall of the guide groove on its sidewall applies a lateral thrust to the guide rod, forcing the rotating disk to rotate circumferentially on the upper mold plate. Subsequently, the rotational motion is distributed to each slide rod through the connecting assembly. This transformation of a single vertical downward motion into multi-directional radial motion in the horizontal plane is beneficial for achieving stable and reliable power conversion in a confined mold space.

[0010] In a preferred embodiment of the present invention, the connecting component includes a vortex groove and a slider. The vortex groove is formed on the rotating disk, and the slider is connected to the slide rod and slidably connected in the vortex groove.

[0011] To achieve the above technical solution, when the rotating disk rotates, the inner wall of the vortex groove, which has involute trajectory characteristics, slides and compresses the slider, thereby smoothly driving each slide rod to translate radially outward along the connecting hole. The vortex groove structure provides uniform driving torque, reducing the risk of slide rods getting stuck in the mounting groove.

[0012] In a preferred embodiment of the present invention, the guide groove includes an avoidance section and a drive section that are interconnected. The length direction of the avoidance section is parallel to the displacement direction of the cutter, and the length direction of the drive section is set at an angle to the length direction of the avoidance section.

[0013] To achieve the above technical solution, during the initial stroke when the cutter just contacts and cuts off the material head, the guide rod is in the avoidance section, the rotary disk does not rotate, and the slide rod remains stationary to provide support force for the support column in the forming process, reducing the probability of deformation of the support column caused by shear stress; after the material head is cut off, the guide rod enters the drive section and begins to drive the slide rod to pull the core back, which is beneficial to improving the cutting quality.

[0014] As a preferred embodiment of the present invention, the end of the slide bar facing the connecting hole is provided with a conical forming head, which is used to form a positioning recess in the side wall of the support column.

[0015] To achieve the above technical solution, when the slide bar moves away from the connecting hole to perform core pulling, the conical structure provides a reasonable demolding slope for the demolding action, so that the forming head can quickly disengage from the inner wall of the positioning concave hole after a small displacement, effectively reducing the sliding friction during the core pulling process and reducing the risk of the inner wall of the product side hole being scratched.

[0016] As a preferred embodiment of the present invention, the slide rod includes a tube body and a valve needle slidably connected to the tube body. The conical forming head is disposed on the valve needle. A vent hole is provided on the tube body. The opening of the vent hole is located at one end of the tube body near the connecting hole. When the tube body moves away from the connecting hole, the valve needle moves away from the connecting hole through a linkage structure so that the vent hole communicates with the connecting hole. An air inlet channel for communicating with the vent hole is provided in the upper template.

[0017] To achieve the above technical solution, during casting, the front end of the valve needle closely adheres to and seals the vent hole on the tube body, reducing the risk of molten material entering the vent hole. During the core-pulling action, the tube body moves away from the connecting hole, and the linkage structure causes the internal valve needle to move outward synchronously with a larger displacement, thereby creating a displacement difference between the valve needle and the tube body, exposing the vent hole and connecting it to the connecting hole. This allows the gas in the air intake channel to be promptly introduced into the positioning recess to break the demolding negative pressure and improve the smoothness of demolding.

[0018] As a preferred embodiment of the present invention, the linkage structure includes a first rack, a second rack, and a gear. A placement groove is provided on the tube body, and the gear is rotatably connected to the placement groove. The first rack is fixed to the upper template, and the second rack is fixed to the outer wall of the valve needle. The gear meshes with both the first rack and the second rack.

[0019] To achieve the above technical solution, when the tube body is pulled outward by the transmission mechanism, the gear rolls and rotates on the first rack. The rotating gear synchronously drives the second rack, causing the valve needle to retract outward at a speed and displacement greater than that of the tube body, thus quickly opening the vent.

[0020] In a preferred embodiment of the present invention, the fixed template has a receiving groove on the side facing the upper template, and the cutter is slidably connected in the receiving groove.

[0021] To achieve the above technical solution, the cutter can be stored in the receiving groove when it resets upwards. The receiving groove provides sufficient concealed space for the cutter's up-and-down reciprocating motion, ensuring the flatness of the upper and lower templates when they are closed with the fixed template, and reducing the possibility of interference from external parts.

[0022] In a preferred embodiment of the present invention, a positioning block is connected to the side of the upper template facing the fixed template, a guide plate is connected to the side wall of the cutter, the guide plate is slidably connected to the positioning block, and the positioning block is located in the receiving groove.

[0023] To achieve the above technical solution, when the cutter presses down and drives the rotating disk to rotate, the guide plate always slides along the positioning block. The positioning block provides stable lateral rigid support for the cutter, effectively counteracting the lateral thrust force experienced by the cutter when it moves the rotating disk, and reducing the risk of the cutter bending, deflecting, or deforming.

[0024] In a preferred embodiment of the present invention, a guide post is connected to the side of the lower forming groove facing the upper template, the guide post is inserted into the connecting hole, and there is a gap between the guide post and the inner wall of the connecting hole.

[0025] To achieve the above technical solution, when the upper and lower mold plates are closed, the guide column passes through the connecting hole and forms a preset gap. This gap is used to form the hollow tubular structure of the support column. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the housing of a vehicle fan motor. Figure 2 This is a structural diagram of the housing of an automotive fan motor, mainly showing the location of the through slot; Figure 3 This is the front view of the template below; Figure 4 This is a 3D model of the template below; Figure 5 This is the front view of the template above; Figure 6 This is a 3D representation of the template above; Figure 7 To show the exploded view between the upper template and the fixed template; Figure 8 To illustrate the structure of the template; Figure 9 This is an exploded view of the template above, mainly showing the position of the guide rods; Figure 10 This is an exploded view of the template above, mainly showing the position of the rotating disk; Figure 11 for Figure 10 Enlarged view of point A; Figure 12 To illustrate the structure of the slide bar; Figure 13 To illustrate the structural diagram of the tube; Figure 14 This is a structural diagram to illustrate the valve needle.

[0027] Reference numerals: 1. Fixed template; 2. Upper template; 3. Lower template; 4. Lower forming groove; 5. Upper forming groove; 7. Connecting hole; 8. Glue inlet; 9. Protrusion; 10. Guide post; 11. Receiving groove; 12. Cutting blade; 13. Hydraulic cylinder; 14. Positioning block; 15. Guide plate; 16. Mounting groove; 17. Air intake channel; 18. Transmission mechanism; 19. Guide groove; 20. Clearance section; 21. Drive section; 22. Guide rod; 23. Rotary disk; 26. Connecting assembly; 27. Vortex groove; 28. Slider; 29. ​​Slide rod; 30. Tube body; 31. Placement groove; 32. Vent hole; 33. Valve needle; 34. Conical forming head; 35. Linkage structure; 36. First rack; 37. Second rack; 38. Gear; 39. Pin; 40. Car fan motor housing; 41. Support column; 42. Through groove; 43. Positioning recess; 44. Material head. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered.

[0029] A casting mold structure for an automotive fan motor housing includes a fixed mold plate 1, an upper mold plate 2, and a lower mold plate 3. The lower mold plate 3 has a lower forming groove 4 on the side facing the upper mold plate 2, and the upper mold plate 2 has an upper forming groove 5 on the side facing the lower mold plate 3. When the upper mold plate 2 and the lower mold plate 3 are pressed together to close the mold, the upper forming groove 5 and the lower forming groove 4 together form a cavity for molding the automotive fan motor housing 40.

[0030] To form the support column 41 at the center of the main body of the casing, a connecting hole 7 for forming the support column 41 is provided on the upper template 2. One end of the connecting hole 7 communicates with the cavity, while the other end of the connecting hole 7 communicates with the inlet 8 on the fixed template 1. During die casting, molten metal is injected from the inlet 8 and fills the cavity through the connecting hole 7.

[0031] A protrusion 9 for forming a through slot 42 for forming the housing 40 of an automotive fan motor is fixedly connected to the inner wall of the upper forming groove 5. In order to form the hollow tubular structure inside the support column 41, a guide column 10 is fixedly connected to the side of the lower forming groove 4 facing the upper template 2. The guide column 10 passes into the connecting hole 7 when the mold is closed, and a preset gap is left between the outer wall of the guide column 10 and the inner wall of the connecting hole 7. This gap is the wall thickness forming space of the support column 41.

[0032] To directly cut off the material head 44 at the inlet 8 inside the mold, the fixed mold plate 1 has a receiving groove 11 on the side facing the upper mold plate 2. A cutter 12 for cutting off the material head 44 is slidably connected to the side of the upper mold plate 2 facing away from the lower mold plate 3. The cutter 12 is initially housed in the receiving groove 11 of the fixed mold plate 1. The cutter 12 is driven by a hydraulic cylinder 13, which is fixed to the side wall of the upper mold plate 2.

[0033] A positioning block 14 is fixedly connected to the side of the upper template 2 facing the fixed template 1 by bolts. The positioning block 14 is located in the receiving groove 11 of the fixed template 1. At the same time, a guide plate 15 is fixedly connected to the side wall of the cutter 12. The guide plate 15 is slidably connected to the side wall of the positioning block 14.

[0034] The upper template 2 has a mounting groove 16 that communicates with the connecting hole 7. Four slide rods 29, each with its end located within the connecting hole 7, are slidably connected within the mounting groove 16. These four slide rods 29 are circumferentially and equidistantly distributed along the axis of the connecting hole 7. The position of one of the slide rods 29 corresponds to the position of the protrusion 9 on the inner wall of the upper forming groove 5 on the same radial reference line, thus ensuring that the positioning recess 43 is aligned with the through groove 42.

[0035] As the cutter 12 moves toward the material head 44, the transmission mechanism 18 causes all the slide rods 29 to move synchronously away from the connecting hole 7. The transmission mechanism 18 includes a guide groove 19, a guide rod 22, a rotating disk 23, and a connecting assembly 26. The rotating disk 23 is rotatably connected to the upper template 2 via bearings. A connecting hole is formed in the center of the rotating disk 23, and the connecting hole 7 on the upper template 2 is located inside and coaxially aligned with this connecting hole. The guide groove 19 is formed on the side wall of the cutter 12. One end of the guide rod 22 is fixed to an eccentric position on the upper surface of the rotating disk 23, while the other end is slidably connected to the guide groove 19.

[0036] The guide groove 19 includes a smooth, interconnected clearance section 20 and a drive section 21. The clearance section 20 is located below the drive section 21, and the length direction of the clearance section 20 is parallel to the vertical displacement direction of the cutter 12. The length direction of the drive section 21 is set at an angle to the length direction of the clearance section 20.

[0037] During the initial stroke of the cutter 12 as it begins to contact and cut off the material head 44, the guide rod 22 slides within the avoidance section 20. At this time, the rotating disk 23 does not rotate, and the sliding rod 29 remains stationary, thus providing physical support to the forming support column 41 from the outside and preventing deformation of the support column 41 due to cutting shearing force. After the material head 44 is completely cut off, the cutter 12 continues to descend, and the guide rod 22 smoothly enters the drive section 21. The inner wall of the drive section 21 abuts and presses against the side of the guide rod 22, thereby forcing the rotating disk 23 to rotate circumferentially on the upper template 2.

[0038] When the rotating disk 23 rotates circumferentially, the torque is converted into linear displacement of the slide rod 29 via the connecting assembly 26. The connecting assembly 26 includes a vortex groove 27 and a slider 28. The vortex groove 27 is formed with an involute trajectory on the side of the rotating disk 23 facing the slide rod 29. A slider 28 is fixedly connected to the side wall of each slide rod 29, and the slider 28 is slidably engaged in the vortex groove 27. When the rotating disk 23 rotates, the inner wall of the vortex groove 27, with its involute characteristics, gently actuates the slider 28, thereby driving the corresponding slide rod 29 to translate away from the connecting hole 7 within the mounting groove 16, completing the lateral core-pulling action. The cross-section of the vortex groove 27 is T-shaped.

[0039] The slide bar 29 is provided with a conical forming head 34 at one end facing the connecting hole 7. The conical forming head 34 is used to form the required positioning recess 43 on the side wall of the support column 41. The conical design provides sufficient demolding draft angle for demolding.

[0040] The slide bar 29 is assembled from two parts: a tube body 30 and a valve needle 33 that is slidably connected inside the tube body 30. A conical forming head 34 is integrally formed at the end of the valve needle 33. A vent hole 32 is provided on the side wall of the tube body 30, and the opening of the vent hole 32 is located at the end of the tube body 30 near the connecting hole 7.

[0041] When the tube body 30 moves away from the connection hole 7, the internal linkage structure 35 causes the valve needle 33 to move further away from the connection hole 7, thereby causing the front end of the valve needle 33 to retract, exposing the vent hole 32 and connecting it with the connection hole 7; at the same time, the upper template 2 has an air intake channel 17 for connecting with the external air source and the vent hole 32.

[0042] The linkage structure 35 includes a first rack 36, a second rack 37, and a gear 38. A placement groove 31 is provided on the tube body 30, and the gear 38 is rotatably connected to the placement groove 31 via a pin 39; the first rack 36 is fixed to the inner wall of the mounting groove 16; the second rack 37 is fixed to the outer wall of the valve needle 33, and the teeth of the gear 38 mesh with both the first rack 36 and the second rack 37.

[0043] When the vortex groove 27 moves the tube body 30 outward, the gear 38 inside the tube body 30, due to its meshing with the stationary first rack 36, will rotate while moving. This rotating gear 38 synchronously drives the meshing second rack 37, causing the valve needle 33 to retract outward relative to the tube body 30 at twice the relative speed, instantly opening the blocked vent hole 32. The gas in the air intake channel 17 is then quickly introduced into the positioning recess 43 through the vent hole 32, breaking the demolding negative pressure.

[0044] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A casting mold structure for a vehicle fan motor housing, comprising a lower mold plate (3), an upper mold plate (2), and a fixed mold plate (1), wherein the lower mold plate (3) has a lower forming groove (4) on the side facing the upper mold plate (2), and the upper mold plate (2) has an upper forming groove (5) on the side facing the lower mold plate (3), wherein when the upper mold plate (2) and the lower mold plate (3) are pressed together, a cavity for forming the main body is formed between the upper forming groove (5) and the lower forming groove (4), the fixed mold plate (1) is located on the side of the upper mold plate (2) away from the lower mold plate (3), the fixed mold plate (1) has a glue inlet (8), and the upper mold plate (2) has a connecting hole (7) for forming a support column (41), one end of the connecting hole (7) is connected to the glue inlet (8), and the other end of the connecting hole (7) is connected to the cavity, characterized in that: The inner wall of the upper forming groove (5) is connected to a protrusion (9) for forming a through groove (42). The upper template (2) is slidably connected to a cutter (12) for cutting off the material head (44) on the side opposite to the lower template (3). The upper template (2) is provided with an installation groove (16) communicating with the connecting hole (7). Multiple slide rods (29) with their ends located in the connecting hole (7) and used for forming positioning recesses (43) are slidably connected in the installation groove (16). The multiple slide rods (29) are distributed circumferentially along the axis of the connecting hole (7). The position of one slide rod (29) corresponds to the position of the protrusion (9). During the process of the cutter (12) moving towards the material head (44), all slide rods (29) are moved synchronously away from the connecting hole (7) through the transmission mechanism (18).

2. The casting mold structure for a vehicle fan motor housing according to claim 1, characterized in that: The transmission mechanism (18) includes a guide groove (19), a guide rod (22), a rotating disk (23), and a connecting assembly (26). The guide groove (19) is opened on the cutter (12). The rotating disk (23) is rotatably connected to the upper template (2). A connecting hole is opened in the center of the rotating disk (23). The connecting hole (7) is located inside the connecting hole. The guide rod (22) is fixed on the rotating disk (23) and slidably connected in the guide groove (19). When the cutter (12) moves towards the material head (44), the inner wall of the guide groove (19) abuts against the guide rod (22) to drive the rotating disk (23) to rotate. When the rotating disk (23) rotates, it drives all the sliding rods (29) to move away from the connecting hole (7) through the connecting assembly (26).

3. The casting mold structure for a vehicle fan motor housing according to claim 2, characterized in that: The connecting component (26) includes a vortex groove (27) and a slider (28). The vortex groove (27) is formed on the rotating disk (23), and the slider (28) is connected to the slide rod (29) and slidably connected in the vortex groove (27).

4. The casting mold structure for a vehicle fan motor housing according to claim 2 or 3, characterized in that: The guide groove (19) includes a clearance section (20) and a drive section (21) that are connected to each other. The length direction of the clearance section (20) is parallel to the displacement direction of the cutter (12), and the length direction of the drive section (21) is set at an angle to the length direction of the clearance section (20).

5. The casting mold structure for a vehicle fan motor housing according to claim 1, characterized in that: The slide bar (29) has a conical forming head (34) at one end facing the connecting hole (7), and the conical forming head (34) is used to form a positioning recess (43) on the side wall of the support column (41).

6. The casting mold structure for a vehicle fan motor housing according to claim 5, characterized in that: The slide bar (29) includes a tube (30) and a valve needle (33) slidably connected inside the tube (30). The conical forming head (34) is disposed on the valve needle (33). A vent hole (32) is provided on the tube (30). The opening of the vent hole (32) is located at one end of the tube (30) near the connecting hole (7). When the tube (30) moves away from the connecting hole (7), the valve needle (33) moves away from the connecting hole (7) through the linkage structure (35) so that the vent hole (32) communicates with the connecting hole (7). An air inlet channel (17) for communicating with the vent hole (32) is provided in the upper template (2).

7. The casting mold structure for a vehicle fan motor housing according to claim 6, characterized in that: The linkage structure (35) includes a first rack (36), a second rack (37) and a gear (38). A placement groove (31) is provided on the tube body (30). The gear (38) is rotatably connected in the placement groove (31). The first rack (36) is fixed on the upper template (2). The second rack (37) is fixed on the outer wall of the valve needle (33). The gear (38) meshes with both the first rack (36) and the second rack (37).

8. The casting mold structure for a vehicle fan motor housing according to claim 1, characterized in that: The fixed template (1) has a receiving groove (11) on the side facing the upper template (2), and the cutter (12) is slidably connected in the receiving groove (11).

9. The casting mold structure for a vehicle fan motor housing according to claim 8, characterized in that: The upper template (2) is connected to a positioning block (14) on the side facing the fixed template (1), and a guide plate (15) is connected to the side wall of the cutter (12). The guide plate (15) is slidably connected to the positioning block (14), and the positioning block (14) is located in the receiving groove (11).

10. The casting mold structure for a vehicle fan motor housing according to claim 1, characterized in that: The lower forming groove (4) is connected to a guide post (10) on the side facing the upper template (2). The guide post (10) is inserted into the connecting hole (7), and there is a gap between the guide post (10) and the inner wall of the connecting hole (7).

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