Die-casting core with exhaust structure and rotor die-casting mold

Abstract

The disclosure provides a die-casting mold core with an exhaust structure, which comprises a front end mold core, a middle sleeve mold core, a rear end mold core and a core shaft. The front end mold core, the middle sleeve mold core and the rear end mold core are sequentially sleeved on the core shaft and surround to form a cavity. An exhaust hole is arranged on the core shaft and penetrates along the axial direction of the core shaft. A pouring gate and a first exhaust passage are arranged on the front end mold core and are communicated with the cavity. A second exhaust passage is formed between the front end mold core and the core shaft. The cavity is communicated with the exhaust hole through the first exhaust passage and the second exhaust passage. In this way, the exhaust passage composed of the first exhaust passage, the second exhaust passage and the exhaust hole is designed near the pouring gate, which effectively reduces the number of air holes in the rotor, especially significantly reduces the number of air holes in the front end aluminum ring (i.e. the feeding end) of the rotor, thereby greatly improving the quality of the rotor and improving the yield of the product.

Description

Technical Field

[0001] This disclosure relates to the field of rotor die casting technology, and in particular to a die casting core with an exhaust structure and a rotor die casting mold. Background Technology

[0002] In the die-casting production of rotors (e.g., cast aluminum rotors for motors), the die-casting medium is injected into the cavity at a certain pressure along the gate. The flow path of the die-casting medium in the cavity is from the front end of the cavity (the end closest to the gate), through the middle of the cavity, and then from the middle of the cavity into the rear end of the cavity (the end away from the gate). Then, the die-casting medium sequentially fills the rear end, the middle of the cavity, and the front end of the cavity until the entire cavity is filled. During the process of the die-casting medium filling the cavity, the air in the cavity needs to be discharged to avoid the air being compressed and mixed into the die-casting medium, forming a large number of pores, which would affect the quality of the rotor. Therefore, existing die-casting mold cores are usually designed with venting channels to discharge the air in the internal cavity and reduce the number of pores in the rotor, thereby improving the quality of the rotor. However, existing die-casting mold cores do not incorporate the airflow direction within the cavity into their exhaust structure design, resulting in poor exhaust performance, limited improvement in rotor quality, and impact on rotor yield. Summary of the Invention

[0003] This disclosure provides a die-casting mold core with a venting structure to at least solve the aforementioned problems in the prior art.

[0004] To achieve the above objectives, this disclosure provides the following technical solution: a die-casting mold core with a venting structure, comprising a front mold core, a middle mold core, a rear mold core, and a mandrel. The front mold core, the middle mold core, and the rear mold core are sequentially fitted onto the mandrel and surround to form a cavity. A venting hole is provided on the mandrel, and the venting hole is arranged through the mandrel along its axial direction. A gate and a first venting channel communicating with the cavity are provided on the front mold core. A second venting channel is formed between the front mold core and the mandrel. The cavity is connected to the venting hole through the first venting channel and the second venting channel.

[0005] In one embodiment, the front mold core includes: The first front mold core is sleeved on the mandrel, and the side of the first front mold core facing the middle mold core has a forming groove, and the gate is located on the bottom wall of the forming groove. The second front-end mold core is fitted onto the mandrel and housed within the forming groove. The second front-end mold core abuts against the bottom wall of the first front-end mold core and together with the first front-end mold core forms a cavity at the front end. This cavity at the front end is used for forming the rotor's front end. A first venting channel is formed between the second front mold core and the first front mold core, and a second venting channel is formed between the second front mold core and the mandrel. The first venting channel is connected to the cavity and the second venting channel.

[0006] In one embodiment, the first venting channel is disposed on the side of the second front mold core facing the bottom wall of the forming groove, and the first venting channel extends radially along the mandrel; or, The first venting channel is located on the bottom wall of the first front mold core facing the second front mold core, and extends radially along the mandrel; or, A portion of the first venting channel is located on the side of the second front mold core facing the bottom wall of the forming groove, and another portion of the first venting channel is located on the side of the bottom wall of the first front mold core facing the second front mold core, and the first venting channel extends in the radial direction of the mandrel.

[0007] In one embodiment, the second venting channel is disposed on the inner wall of the first front mold core, and the second venting channel extends in a direction parallel to the center line of the mandrel; or, The second venting channel is located on the outer wall of the mandrel, and extends in a direction parallel to the centerline of the mandrel; or, A portion of the second venting channel is located on the inner wall of the first front mold core, and another portion is located on the outer wall of the mandrel, with the second venting channel extending in a direction parallel to the centerline of the mandrel.

[0008] In one embodiment, the front mold core is further provided with a slag discharge cavity, which is connected to the first exhaust channel; The slag discharge chamber is configured on the second front mold core; or, the slag discharge chamber is configured on the first front mold core; or, a portion of the slag discharge chamber is configured on the second front mold core, and the other portion of the slag discharge chamber is configured on the first front mold core.

[0009] In one embodiment, the inner diameter of the second front mold core is larger than the shaft diameter of the mandrel, and the difference between the inner diameter of the second front mold core and the shaft diameter of the mandrel is 0.01mm-0.05mm.

[0010] In one embodiment, the die-casting mold core with a venting structure further includes an anti-detachment component, which is mounted on the mandrel and used to press against the second front mold core to prevent the second front mold core and the rotor from detaching from the mandrel.

[0011] In one embodiment, the anti-detachment component includes a threaded post, an elastomer, and a steel ball; the mandrel is provided with a through hole and a threaded hole arranged opposite to each other, both of which are connected to the vent hole; one end of the threaded post is threaded to the threaded hole, and the other end of the threaded post extends into the vent hole and is connected to one end of the elastomer, and the other end of the elastomer extends into the through hole and is connected to the steel ball; part of the steel ball is located in the through hole, and the other part protrudes out of the through hole and abuts against the second front end mold core to prevent the second front end mold core and the rotor from detaching from the mandrel.

[0012] This disclosure also provides a rotor die-casting mold, including the above-described die-casting mold core with a venting structure; The injection unit is inserted into the gate to inject the die casting medium into the gate; An ejector assembly is connected to the injection unit and is used to eject the injection unit.

[0013] In one embodiment, there are multiple gates, which are circumferentially spaced about the center line of the front mold core. The injection component is used to connect to external injection equipment. The rotor die-casting mold has casting channels that are connected to each gate. The injection component is connected to each gate through the casting channels.

[0014] In one possible implementation, the ejection component includes: The guide seat is located on the side of the front mold core away from the rear mold core, and is spaced apart from the front mold core along the axis of the mandrel. The connector has one end connected to the injection unit; The movable block is connected to the other end of the connector and is slidably connected to the guide seat along the axial direction of the spindle; The inclined slider is slidably connected to the guide seat in a direction perpendicular to the axis of the spindle, and the inclined surface of the inclined slider can slidably abut against the movable block; The driving component is connected to the inclined slider and is used to drive the inclined slider to move in a direction perpendicular to the axis of the spindle.

[0015] In the aforementioned die-casting mold core with a venting structure, firstly, the die-casting medium is injected into the cavity at a certain pressure along the gate. The flow path of the die-casting medium within the cavity is from the front end (the end closest to the gate), through the middle of the cavity, and then from the middle of the cavity into the rear end (the end away from the gate). Then, the die-casting medium sequentially fills the rear end, the middle of the cavity, and the front end of the cavity until the entire cavity is filled. During the filling process, the airflow direction inside the cavity is from the rear end to the middle of the cavity, and then from the middle of the cavity into the front end of the cavity, flowing towards the... The air at the front end flows sequentially along the first exhaust channel and the second exhaust channel to the exhaust hole on the mandrel, and is discharged from the exhaust hole, thereby effectively reducing the number of air holes in the rear end, middle and front end of the rotor, especially the number of air holes at the front end of the rotor is significantly reduced; thus, by designing the exhaust channel composed of the first exhaust channel, the second exhaust channel and the exhaust hole to be located near the gate, the number of air holes in the rotor is effectively reduced, especially the number of air holes in the front aluminum ring of the rotor (i.e. the feed end) is significantly reduced, thereby greatly improving the quality of the rotor and increasing the yield of the product.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 A schematic diagram of the rotor cast aluminum section in an embodiment of this disclosure is shown; Figure 2 A schematic diagram of the structure of a die-casting mold core with an venting structure is shown in an embodiment of this disclosure; Figure 3 It shows Figure 2 A schematic diagram of the cross-sectional structure of a die-casting mold core with a venting structure along the III-III direction; Figure 4 It shows Figure 2 An exploded view of the die-casting mold core with a venting structure. Figure 5 It shows Figure 4 A schematic diagram of the structure of the first front-end mold core; Figure 6 It shows Figure 4 Schematic diagram of the central spindle and anti-detachment components; Figure 7 It shows Figure 4 Exploded structural diagram of the central rotor, mandrel, second front end mold core and anti-detachment component; Figure 8 It shows Figure 4 Schematic diagram of the middle rotor; Figure 9 A schematic diagram of the rotor die-casting mold in an embodiment of this disclosure is shown; Figure 10 It shows Figure 7 Exploded view of the central rotor die-casting mold; Figure 11 It shows Figure 8 A schematic diagram of the structure of the injection unit and the material cake.

[0019] Explanation of the numbers in the diagram: 10. Die-casting mold core with venting structure; 11. Front mold core; 111. First front mold core; 112. Second front mold core; 113. Gate; 114. First venting channel; 115. Second venting channel; 116. Slag discharge chamber; 12. Middle sleeve mold core; 13. Rear mold core; 14. Mandrel; 141. Vent hole; 15. Anti-detachment component; 151. Threaded column; 152. Elastomer; 153. Steel ball; 20. Injection component; 21. Injection body; 22. Injection plug; 30. Ejection assembly; 31. Guide seat; 32. Connector; 33. Movable block; 34. Inclined slider; 35. Drive component; 40. Housing; 50. Rotor; 51. Rotor aluminum casting part; 52. Rotor core; 60. Material cake. Detailed Implementation

[0020] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0021] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this disclosure can be achieved, and this is not limited herein.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] The embodiments described above in this application will be described in detail below with reference to the accompanying drawings.

[0024] Please refer to the following: Figure 1 and Figure 2 This application provides a die-casting core 10 with a venting structure for die-casting a rotor. The die-casting core 10 with a venting structure includes a front core 11, a middle core 12, a rear core 13, and a mandrel 14. The front core 11, the middle core 12, and the rear core 13 are sequentially fitted onto the mandrel 14 and form a cavity for forming the aluminum casting part 51 of the rotor. (See reference...) Figure 3The mandrel 14 has an exhaust hole 141 that extends through the mandrel 14 along its axial direction. The front mold core 11 has a gate 113 that connects to the cavity and a first exhaust channel 114. A second exhaust channel 115 is formed between the front mold core 11 and the mandrel 14. The cavity is connected to the exhaust hole 141 through the first exhaust channel 114 and the second exhaust channel 115. The die casting medium enters the cavity through the gate 113 to fill the cavity and form the rotor cast aluminum part 51.

[0025] In the aforementioned die-casting mold core 10 with a venting structure, firstly, the die-casting medium is injected into the cavity at a certain pressure along the gate 113. The flow path of the die-casting medium in the cavity is from the front end of the cavity (the end closest to the gate 113), through the middle of the cavity, and then from the middle of the cavity into the rear end of the cavity (the end away from the gate 113). Then, the die-casting medium sequentially fills the rear end, the middle of the cavity, and the front end of the cavity until the entire cavity is filled. During the filling process, the airflow direction inside the cavity is from the rear end of the cavity to the middle of the cavity, and then from the middle of the cavity into the front end of the cavity. The air flowing to the front end of the cavity sequentially flows along the first venting channel 114 and... The second channel flows into the vent hole 141 on the mandrel 14 and is discharged from the vent hole 141, thereby effectively reducing the number of pores in the rear, middle and front ends of the rotor cast aluminum part 51, especially the number of pores at the front end of the rotor cast aluminum part 51 is significantly reduced; thus, by designing the vent channel composed of the first vent channel 114, the second vent channel 115 and the vent hole 141 to be located near the gate 113, the number of pores in the rotor cast aluminum part 51 is effectively reduced, especially the number of pores in the front aluminum ring (i.e., the feed end) of the rotor cast aluminum part 51 is significantly reduced, thereby greatly improving the quality of the rotor cast aluminum part 51 and increasing the product yield.

[0026] For example, the die-casting medium can be molten aluminum, and the rotor aluminum casting part 51 can be the rotor aluminum casting part 51 of an electric motor. It should be noted that the rotor 50 of the electric motor includes the rotor aluminum casting part 51 and the rotor core 52.

[0027] Please refer to the following: Figure 3 and Figure 4In some embodiments, the front end mold core 11 includes a first front end mold core 111 and a second front end mold core 112. The first front end mold core 111 is sleeved on the mandrel 14, and a molding groove is opened on the side of the first front end mold core 111 facing the middle mold core 12. The gate 113 is provided on the bottom wall of the molding groove. The second front end mold core 112 is sleeved on the mandrel 14 and housed in the molding groove. The second front end mold core 112 abuts against the bottom wall of the first front end mold core 111 and surrounds the first front end mold core 111 to form a front end with a cavity. The front end of the cavity is used for molding the front end of the rotor aluminum casting part 51. A first venting channel 114 is formed between the second front end mold core 112 and the first front end mold core 111, and a second venting channel 115 is formed between the second front end mold core 112 and the mandrel 14. The first venting channel 114 is connected to the cavity and the second venting channel 115.

[0028] Thus, by designing the first front mold core 111 and the second front mold core 112 as separate structures, and setting the first exhaust channel 114 between the first front mold core 111 and the second front mold core 112, the first exhaust channel 114 can be machined on the side of the first front mold core 111 facing the second front mold core 112 or on the side of the second front mold core 112 facing the first front mold core 111. This allows the first exhaust channel 114 to have a larger machining space, which is beneficial for machining a first exhaust channel 114 with a smaller cross-sectional area. At the same time, after die casting, the first front mold core 111 and the second front mold core 112 can be separated to facilitate the removal of aluminum dross from the first exhaust channel 114, and the operation is convenient and quick.

[0029] Similarly, when machining the second exhaust channel 115, the first front end mold core 111 and the mandrel 14 are separate structures, so that the first front end mold core 111 and the mandrel 14 can be separated and the second exhaust channel 115 can be machined on the first front end mold core 111 or the second front end mold core 112. This allows for a larger machining space between the second exhaust channels 115, which is beneficial for machining the second exhaust channel 115 with a smaller cross-sectional area. At the same time, after die casting, the first front end mold core 111 and the mandrel 14 can be separated to clean out the aluminum slag in the second exhaust channel 115, and the operation is convenient and quick.

[0030] Understandably, when the cross-sectional dimensions of the first exhaust channel 114 and the second exhaust channel 115 are too large, aluminum fly ash can easily clog the air passages, making them very difficult to clean and posing a safety hazard. Therefore, the cross-sectional areas of the first exhaust channel 114 and the second exhaust channel 115 are usually designed to be very small. Moreover, if the front mold core 11 is designed as an integral structure, the first exhaust channel 114 and the second exhaust channel 115 need to be machined by drilling. If a smaller diameter drill bit is used to machine the first exhaust channel 114, the drill bit will be damaged during machining. When a larger diameter drill bit is used to machine the first exhaust channel 114, the cross-sectional area of ​​the machined first exhaust channel 114 is too large to meet the machining requirements.

[0031] Furthermore, the first exhaust channel 114 is disposed on the side of the second front mold core 112 facing the bottom wall of the forming groove, and the first exhaust channel 114 extends in the radial direction of the mandrel 14. Thus, the first exhaust channel 114 can be directly machined on the bottom wall of the second front mold core 112 facing the forming groove by a milling cutter, which is simple, convenient and quick to operate.

[0032] Furthermore, the first exhaust channel 114 is disposed on the bottom wall of the first front mold core 111 facing the second front mold core 112, and the first exhaust channel 114 extends in the radial direction of the mandrel 14. At this time, the exhaust channel can be directly machined on the bottom wall of the side of the first front mold core 111 facing the second front mold core 112 by a milling cutter, which is simple, convenient and quick to operate.

[0033] Furthermore, a portion of the first venting channel 114 is disposed on the side of the second front end mold core 112 facing the bottom wall of the forming groove, and another portion of the first venting channel 114 is disposed on the side of the bottom wall of the first front end mold core 111 facing the second front end mold core 112. The first venting channel 114 extends in the radial direction of the mandrel 14. Thus, a portion of the first venting channel 114 can be machined on the bottom wall of the second front end mold core 112 facing the forming groove by a milling cutter, and the other portion of the first venting channel 114 can be machined on the bottom wall of the first front end mold core 111.

[0034] Furthermore, the second venting channel 115 is disposed on the inner wall of the first front end mold core 111, and the second venting channel 115 extends in a direction parallel to the center line of the mandrel 14. Thus, the second venting channel 115 can be directly machined on the inner wall of the first front end mold core 111 by a milling cutter, which is simple, convenient and quick to operate.

[0035] Furthermore, the second exhaust channel 115 is provided on the outer wall of the mandrel 14, and the second exhaust channel 115 extends in a direction parallel to the center line of the mandrel 14. In this way, the second exhaust channel 115 can be directly machined on the outer wall of the mandrel 14 by a milling cutter, which is simple, convenient and quick to operate.

[0036] Furthermore, a portion of the second venting channel 115 is disposed on the inner wall of the second front mold core 112, and a portion of the second venting channel 115 is disposed on the outer wall of the mandrel 14, and the second venting channel 115 extends in a direction parallel to the center line of the mandrel 14; thus, a portion of the second venting channel 115 can be machined on the inner wall of the first front mold core 111 by a milling cutter, and then the other portion of the second venting channel 115 can be machined on the outer wall of the mandrel 14 by a milling cutter.

[0037] In this embodiment, the cross-sectional shape of the first exhaust channel 114 is not limited. For example, the cross-sectional shape of the first exhaust channel 114 can be rectangular, circular, semi-circular or arc-shaped.

[0038] In this embodiment, the cross-sectional shape of the second exhaust channel 115 is not limited. For example, the second exhaust channel 115 can be a rectangular, circular, semi-circular or arc-shaped structure.

[0039] In this embodiment, there are multiple first exhaust channels 114. The multiple first exhaust channels 114 are arranged circumferentially with the center line of the second front mold core 112 as the axis. Preferably, the first exhaust channels 114 are arranged circumferentially evenly with the center line of the second front mold core 112 as the axis, so as to facilitate uniform exhaust and increase the exhaust volume.

[0040] In this embodiment, there are multiple second exhaust channels 115, which are circumferentially spaced around the center line of the spindle 14. Preferably, the second exhaust channels 115 are evenly arranged circumferentially around the center line of the spindle 14 to facilitate uniform exhaust and improve exhaust volume.

[0041] Please see Figure 5 In some embodiments, the front mold core 11 is also provided with a slag discharge cavity 116, which is connected to the first exhaust channel 114. In this way, after the die casting medium fills the front end of the cavity, the aluminum slag flows into the slag discharge cavity 116 along the first exhaust channel 114 to facilitate slag discharge, thereby further improving the quality of the rotor aluminum casting part 51.

[0042] Furthermore, the slag discharge cavity 116 is configured on the second front end mold core 112 so that the slag discharge cavity 116 can be machined on the second front end mold core 112, making the machining of the slag discharge cavity 116 more convenient. Furthermore, the slag discharge cavity 116 is configured on the first front end mold core 111 so that the slag discharge cavity 116 can be machined on the first front end mold core 111, making the machining of the slag discharge cavity 116 more convenient. Furthermore, a portion of the slag discharge cavity 116 is disposed on the second front end mold core 112, and another portion of the slag discharge cavity 116 is disposed on the first front end mold core 111, so that a portion of the slag discharge cavity 116 can be processed on the second front end mold core 112, and the other portion of the slag discharge cavity 116 can be processed on the first front end mold core 111, making the processing of the slag discharge cavity 116 more convenient.

[0043] In some embodiments, the inner diameter of the second front mold core 112 is greater than the shaft diameter of the mandrel 14, and the difference between the inner diameter of the second front mold core 112 and the shaft diameter of the mandrel 14 is 0.01mm-0.05mm. That is, the difference between the inner diameter of the second front mold core 112 and the shaft diameter of the mandrel 14 satisfies the formula: N1-N2=N. Wherein, the inner diameter of the second front mold core 112 is N1, the shaft diameter of the mandrel 14 is N2, and the difference between the inner diameter of the second front mold core 112 and the shaft diameter of the mandrel 14 is N. Preferably, the difference between the inner diameter of the second front mold core 112 and the shaft diameter of the mandrel 14 is 0.02mm and 0.03mm, respectively.

[0044] Thus, when the difference between the inner diameter of the second front-end mold core 112 and the shaft diameter of the mandrel 14 is less than 0.01mm, due to machining errors, it is difficult for the second front-end mold core 112 to be fitted onto the mandrel 14. When the difference between the inner diameter of the second front-end mold core 112 and the shaft diameter of the mandrel 14 is greater than 0.05mm, the second front-end mold core 112, under the pushing and fixing of the anti-detachment component 15, suffers from severe eccentricity, causing the dimensions of the rotor cast aluminum part 51 to exceed the tolerance standard. When the difference between the inner diameter and the shaft diameter of the mandrel 14 is 0.01mm-0.05mm, it can be ensured that the second front mold core 112 can be smoothly fitted onto the mandrel 14. At the same time, it can also ensure that the eccentricity of the second front mold core 112 is within the allowable error range. For example, when the rotor aluminum casting part 52, the mandrel and the second front mold core are placed into the cavity together, after the mold is closed, the second front mold core and the first front mold core are flat, and the maximum concentricity offset between the two is 0.05mm, which will not affect the initial dynamic balance of the rotor.

[0045] Please see Figure 6 In some embodiments, the die-casting core 10 with a venting structure further includes an anti-detachment component 15, which is mounted on the mandrel 14 and used to press against the second front end core 112 to prevent the second front end core 112 and the rotor cast aluminum part 51 from detaching from the mandrel 14.

[0046] Please see Figure 7 and Figure 8During the production process, the rotor core 52 is first heated to a preset temperature (e.g., 150°C), and then the heated rotor core 52 is inserted into the mandrel and pre-assembled with the second front mold core 112 and other mold core components. During handling, the robot grips or clamps the rotor core 52, and the anti-detachment component at the front end of the mandrel 14 can lock and fix the second front mold core 112 with the rotor core 52 and the mandrel 14 to form a solid mold core assembly to prevent the mandrel 14 and the second front mold core 112 from falling off during handling. Then, the solid mold core assembly is placed into the mold cavity, and after the mold is closed, aluminum liquid is injected. After the aluminum liquid cools, it forms the rotor cast aluminum part 51, which is combined with the rotor core 52 to form the rotor 50.

[0047] refer to Figure 6 In some optional embodiments, the anti-detachment component 15 includes a threaded post 151, an elastomer 152, and a steel ball 153. The mandrel 14 is provided with a through hole and a threaded hole arranged opposite to each other, both communicating with the vent hole. One end of the threaded post 151 is threaded into the threaded hole, and the other end of the threaded post 151 extends into the vent hole 141 and connects to one end of the elastomer 152. The other end of the elastomer 152 extends into the through hole and connects to the steel ball 153. A portion of the steel ball 153 is located within the through hole, and another portion of the steel ball 153 protrudes from the through hole and abuts against the second front-end mold core 112 to prevent the second front-end mold core and the rotor from detaching from the mandrel 14. Exemplarily, the elastomer 152 can be a spring or a rubber post.

[0048] Thus, the threaded column 151 presses against the elastic body 152 until the elastic body 152 undergoes elastic deformation, causing the elastic body 152 to drive the steel ball 153 to press against the inner wall of the second front mold core 112 with a certain pressure, thereby fixing the second front mold core 112 to the mandrel 14, thereby improving the firmness of the second front mold core 112, and the anti-detachment component 15 has a simple structure and is easy to operate.

[0049] In some alternative embodiments, the anti-detachment component includes an elastic column. The first end of the elastic column has a spherical head, and a connecting hole is provided on the shaft wall of the mandrel, communicating with the vent hole. The second end of the elastic column passes through the connecting hole and the vent hole and is fixedly connected to the inner wall of the mandrel. A portion of the spherical head at the first end of the elastic column is located within the connecting hole, while another portion protrudes from the connecting hole. Exemplarily, the elastic column is a cylindrical structure made of an elastic material and possessing axial elastic deformation capability.

[0050] It should be noted that the structures of the anti-detachment components listed above are merely examples, and this application does not limit the specific structure of the anti-detachment components.

[0051] The working principle of the die-casting mold core 10 with the above-mentioned venting structure is roughly as follows: First, the die casting medium is injected into the cavity along the gate 113 at a certain pressure. The flow path of the die casting medium in the cavity is from the front end of the cavity (the end closest to the gate 113), through the middle of the cavity, and then from the middle of the cavity into the rear end of the cavity (the end away from the gate 113). Then, the die-casting medium sequentially fills the rear end, middle and front end of the cavity, and fills the entire cavity. The die-casting medium continues to fill, so that the aluminum slag enters the slag discharge chamber 116 along the first exhaust channel 114 and forms a slag bag, thereby achieving slag discharge and ensuring the forming quality of the rotor aluminum casting part 51. Finally, during the process of filling the mold cavity with the die-casting medium, the airflow direction inside the mold cavity is from the rear end of the mold cavity to the middle of the mold cavity, and from the middle of the mold cavity to the front end of the mold cavity. The air flowing to the front end of the mold cavity flows sequentially along the first exhaust channel 114 and the second channel to the exhaust hole 141 on the mandrel 14, and is discharged from the exhaust hole 141. After the die-casting medium fills the mold cavity, it will enter the slag bag along the first exhaust channel 114, and the air that is not discharged in time in the mold cavity will mix into the slag bag to form bubbles, thereby reducing the bubble content in the rotor cast aluminum part 51 formed in the mold cavity. This effectively reduces the number of pores in the rear end, middle and front end of the rotor cast aluminum part 51, especially significantly reducing the number of pores in the front end of the rotor cast aluminum part 51, thereby improving the quality and yield of the rotor cast aluminum part 51.

[0052] Please refer to the following: Figure 9 and Figure 10 This application also provides a rotor die-casting mold, which includes the aforementioned die-casting mold core 10 with a venting structure, a liquid injection component 20, and an ejector assembly 30. The liquid injection component 20 is inserted into the gate 113 to inject the die-casting medium into the gate 113. The ejector assembly 30 is connected to the liquid injection component 20 and is used to eject the liquid injection component 20. Specifically, the liquid injection component 20 is a mold material tube.

[0053] Furthermore, the rotor die-casting mold also includes a housing 40, and the die-casting core 10 with a venting structure is disposed within the housing 40.

[0054] Please see Figure 10In some embodiments, the ejection assembly 30 includes a guide seat 31, a connector 32, a movable block 33, a slanted slider 34, and a drive member 35. The guide seat 31 is located on the side of the front mold core 11 away from the rear mold core 13 and is spaced apart from the front mold core 11 along the axial direction of the mandrel 14. One end of the connector 32 is connected to the injection component 20, and the movable block 33 is connected to the other end of the connector 32 and is slidably connected to the guide seat 31 along the axial direction of the mandrel 14. The slanted slider 34 is slidably connected to the guide seat 31 in a direction perpendicular to the axis of the mandrel 14, and the inclined surface of the slanted slider 34 slidably abuts against the movable block 33. The drive member 35 is connected to the slanted slider 34 and is used to drive the slanted slider 34 to move in a direction perpendicular to the axis of the mandrel 14. For example, the drive member 35 can be a telescopic cylinder or a telescopic hydraulic cylinder.

[0055] Thus, the inclined slider 34 is driven by the drive component 35 to move in a direction perpendicular to the axis of the mandrel 14. The inclined slider 34 pushes against the movable block 33 through the inclined surface, causing the movable block 33 to move along the axis of the mandrel 14, thereby loosening the adhesion structure between the injection part 20 and the gate 113 formed by the die casting medium. At the same time as the injection part 20 is separated from the gate 113, the slab formed by the die casting medium adhering between the injection part 20 and the gate can be simultaneously pushed off the mold, reducing demolding resistance, achieving labor-saving demolding, and effectively improving the disassembly efficiency of the injection part 20 and the slab.

[0056] It is understandable that the blister is formed by the casting medium in the casting channel between the injection unit 20 and the gate 113.

[0057] In some optional embodiments, the mold has its own pouring channel and no liquid injection plug structure; there are multiple gates 113, which are circumferentially spaced around the center line of the front mold core 11; the liquid injection component 20 is used to connect to external liquid injection equipment, and the rotor die casting mold has pouring channels that are respectively connected to each gate 113, and the liquid injection component 20 is connected to each gate 113 through the pouring channels.

[0058] In this way, by directly forming a casting channel connected to each gate 113 on the rotor die-casting mold, the liquid injection component can be directly supplied to multiple gates 113 through the casting channel, without the need for additional intermediate connecting parts such as injection plugs and injection branch pipes. This simplifies the injection structure, reduces the number of mold parts, and lowers the difficulty of processing and assembly. At the same time, the aluminum liquid transportation path is more direct and smooth, which helps to improve the stability of feeding, ensures synchronous and uniform feeding of multiple gates 113, and improves the quality and production efficiency of rotor die-casting.

[0059] In some specific embodiments, the rotor die-casting mold includes a casting male mold and a casting female mold. Each gate is located on the casting male mold. A first casting groove is provided on the side of the casting male mold facing the casting female mold, and a second casting groove is provided on the side of the casting female mold facing the casting male mold. The first casting groove and the second casting groove form a casting channel, which is connected to each gate 113 and the injection component.

[0060] Thus, the casting channel is designed to be formed by the first casting groove of the male mold and the second casting groove of the female mold, which is simple to process and has high forming accuracy. There is no need to drill deep holes inside the mold, reducing processing difficulty and cost. When the mold is closed, the first casting groove and the second casting groove automatically close to form a complete flow channel. After the mold is opened, the casting channel is open, which makes it easy to clean the residual aluminum material and impurities in the flow channel and facilitates maintenance. The casting channel is stably connected to each gate 113 and the liquid injection component, which can ensure smooth aluminum liquid transportation and uniform feeding of multiple gates, thereby improving the quality of rotor die casting and production stability.

[0061] In some alternative embodiments, an injection plug structure is adopted; the number of gates 113 is multiple, and the multiple gates 113 are circumferentially spaced about the center line of the front mold core 11. The injection component 20 includes an injection body 21 and multiple injection plugs. The injection body 21 is used to connect to an external injection device. The multiple injection plugs are circumferentially spaced about the center line of the injection body 21, and each injection plug is connected to the injection body 21 and used to insert into a corresponding gate 113. For example, the gate 113 is a point gate.

[0062] In this way, the injection component 20 injects liquid into the cavity through multiple gates 113, making the filling of the cavity more uniform and the filling efficiency higher, so as to improve the molding quality and molding efficiency of the rotor aluminum casting part 51. In addition, the use of independently set injection plugs to form a plug-in sealed feeding structure with gates 113 can achieve precise sealing at gates 113 during injection, preventing aluminum liquid from overflowing or flying aluminum from entering the mold during high-pressure die casting, reducing mold maintenance costs and improving maintenance efficiency.

[0063] It should be noted that the above-mentioned mold has two implementation methods: one with its own pouring channel and the other with a liquid injection plug for pouring. The applicant may choose one according to actual needs, and both of the above technical solutions are within the protection scope of this application.

[0064] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A die-casting mold core with a venting structure, comprising a front mold core, a middle mold core, a rear mold core, and a mandrel, wherein the front mold core, the middle mold core, and the rear mold core are sequentially sleeved on the mandrel and surround to form a cavity, characterized in that, The mandrel is provided with an exhaust hole, which is arranged to pass through the mandrel along its axial direction; The front mold core is provided with a gate and a first venting channel that are connected to the cavity. A second venting channel is formed between the front mold core and the mandrel. The cavity is connected to the venting hole through the first venting channel and the second venting channel.

2. The die-casting mold core with venting structure according to claim 1, characterized in that, The front-end mold core includes: A first front mold core is sleeved on the mandrel, and a forming groove is formed on the side of the first front mold core facing the middle mold core, and the gate is located on the bottom wall of the forming groove. The second front-end mold core is sleeved on the mandrel and housed within the forming groove. The second front-end mold core abuts against the bottom wall of the first front-end mold core and together with the first front-end mold core forms a front end with a cavity. The front end of the cavity is used for forming the rotor front end; wherein... The first exhaust channel is formed between the second front mold core and the first front mold core, and the second exhaust channel is formed between the second front mold core and the mandrel. The first exhaust channel is connected to the cavity and the second exhaust channel.

3. The die-casting mold core with venting structure according to claim 2, characterized in that, The first venting channel is located on the side of the second front mold core facing the bottom wall of the forming groove, and the first venting channel extends radially along the mandrel; or, The first venting channel is disposed on the bottom wall of the first front end mold core facing the second front end mold core, and the first venting channel extends radially along the mandrel; or, A portion of the first venting channel is disposed on the side of the second front end mold core facing the bottom wall of the forming groove, and another portion of the first venting channel is disposed on the side of the bottom wall of the first front end mold core facing the second front end mold core, and the first venting channel extends in the radial direction of the mandrel.

4. The die-casting mold core with venting structure according to claim 2, characterized in that, The second venting channel is disposed on the inner wall of the first front mold core, and the second venting channel extends in a direction parallel to the center line of the mandrel; or, The second exhaust channel is disposed on the outer wall of the mandrel, and the second exhaust channel extends in a direction parallel to the center line of the mandrel; or, A portion of the second venting channel is disposed on the inner wall of the first front end mold core, a portion of the second venting channel is disposed on the outer wall of the mandrel, and the second venting channel extends in a direction parallel to the center line of the mandrel.

5. The die-casting mold core with a venting structure according to claim 2, characterized in that, The front mold core is also equipped with a slag discharge cavity, which is connected to the first exhaust channel; The slag discharge cavity is configured on the second front end mold core; Alternatively, the slag discharge cavity is configured on the first front end mold core; Alternatively, a portion of the slag discharge cavity may be disposed on the second front-end mold core, and the other portion of the slag discharge cavity may be disposed on the first front-end mold core.

6. The die-casting mold core with a venting structure according to claim 2, characterized in that, The inner diameter of the second front-end mold core is larger than the shaft diameter of the mandrel, and the difference between the inner diameter of the second front-end mold core and the shaft diameter of the mandrel is 0.01mm-0.05mm.

7. The die-casting mold core with venting structure according to claim 6, characterized in that, The die-casting mold core with a venting structure also includes an anti-detachment component, which is installed on the mandrel and used to press against the second front mold core to prevent the second front mold core and the rotor from detaching from the mandrel.

8. The die-casting mold core with a venting structure according to claim 7, characterized in that, The anti-detachment component includes a threaded post, an elastomer, and a steel ball; The mandrel is provided with a through hole and a threaded hole arranged opposite to each other, and both the through hole and the threaded hole are connected to the vent hole. One end of the threaded post is threaded to the threaded hole, and the other end of the threaded post extends into the vent hole and is connected to one end of the elastic body. The other end of the elastic body extends into the through hole and is connected to the steel ball. One part of the steel ball is located inside the through hole, and the other part protrudes from the through hole and abuts against the second front end mold core to prevent the second front end mold core and the rotor from detaching from the mandrel.

9. A rotor die-casting mold, characterized in that, include: Die-casting mold core with venting structure as described in any one of claims 1-8; The injection component is used to insert into the gate for injecting the die casting medium into the gate; An ejector assembly is connected to the injection unit, and the ejector assembly is used to eject the injection unit.

10. The rotor die-casting mold according to claim 9, characterized in that, The number of gates is multiple, and the multiple gates are arranged circumferentially with the center line of the front mold core as the axis. The injection component is used to connect to an external injection device. The rotor die-casting mold has casting channels that are respectively connected to each of the gates. The injection component is connected to each of the gates through the casting channels.

11. The rotor die-casting mold according to claim 10, characterized in that, The ejection component includes: A guide seat is provided on the side of the front mold core away from the rear mold core, and is spaced apart from the front mold core along the axial direction of the mandrel. A connector, one end of which is connected to the injection device; The movable block is connected to the other end of the connector and is slidably connected to the guide seat along the axial direction of the spindle; An inclined slider is slidably connected to the guide seat in a direction perpendicular to the axis of the spindle, and the inclined surface of the inclined slider slidably abuts against the movable block; A driving component is connected to the inclined slider and is used to drive the inclined slider to move in a direction perpendicular to the axis of the spindle.

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