A die-casting mold for the flywheel housing of a truck engine

Abstract

The present invention discloses a die-casting mold for a flywheel housing of a truck engine, which comprises a fixed mold and a movable mold arranged above the fixed mold. A plurality of side molds driven by a sliding mechanism are arranged between the fixed mold and the movable mold. The sliding mechanism is installed on the fixed mold, and the sliding mechanism drives the corresponding side mold to slide and cooperate with the fixed mold. The fixed mold, the movable mold and each side mold are closed to form a product cavity. It is characterized in that: a pouring port is arranged above the geometric center of the product cavity on the movable mold, and the pouring port penetrates through the movable mold until it is communicated with the central position of the product cavity. A local pressurization area is arranged on the product cavity, and a pressurization mechanism for increasing the pressure in the local pressurization area is arranged on the fixed mold or the side mold. The present invention provides a die-casting mold for a flywheel housing of a truck engine, which can process the flywheel housing by die-casting, improve the production efficiency, and have good local strength of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting molds, and specifically to a die-casting mold for a flywheel housing of a truck engine. Background Art

[0002] The flywheel housing is an important part among heavy truck parts. With the continuous development of vehicle technology, especially the development of electric vehicles, how to improve production efficiency and reduce the production cost of the flywheel housing while ensuring the structural strength of the product during the production process is an issue to be considered at the present stage.

[0003] The flywheels and flywheel housings of commercial vehicle diesel engines are mainly cast. The original process is backward, the casting pollution is serious, and a lot of manpower and material resources are consumed. The coated sand process is mostly used, and even some products use manual molding. The production efficiency is very low, the product material and size are not easy to control, and the processing scrap rate is high. All these greatly increase the production cost. For example, when using the domestic advanced clay sand horizontal static pressure line to produce the flywheel housing of a diesel engine, although it has the characteristics of stable product material, small precision deviation of size, high production efficiency, and low scrap rate, this production method is only applicable to small-batch products. When the product demand is large and the structure is relatively complex, the production capacity requirements of the product cannot be met during the production process, and at the same time, it will cause serious environmental pollution. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems in the related technologies to some extent: to provide a die-casting mold for a flywheel housing of a truck engine, which can process the flywheel housing by die-casting, so as to improve the production efficiency and the local strength of the product is good.

[0005] To this end, an object of the present invention is to provide a die-casting mold for a flywheel housing of a truck engine, which includes a fixed mold, a moving mold arranged above the fixed mold. A plurality of side molds driven by a sliding mechanism are arranged between the fixed mold and the moving mold. The sliding mechanism is installed on the fixed mold. The sliding mechanism drives the corresponding side mold to slide and cooperate with the fixed mold. The fixed mold, the moving mold and each side mold are closed to form a product cavity. It is characterized in that: a pouring port is arranged above the geometric center of the product cavity on the moving mold. The pouring port penetrates through the moving mold until it is communicated with the central position of the product cavity. A local pressurization area is arranged on the product cavity. A pressurization mechanism for increasing the pressure in the local pressurization area is arranged on the fixed mold or the side mold. Since there is a neutral section at the central position of the flywheel housing and the wall thickness around the central position is uniform, setting the feeding position of the runner at the central position of the product cavity can make the feeding efficiency high. In addition, the pressurization mechanism can perform pressurization treatment on the key stress positions on some products, so that the local strength of the product can be high after local pressurization.

[0006] According to an example of the present invention, the pressurizing mechanism includes a pressing head, a connecting rod, and a driver. A piston hole communicating with the local pressurizing area is provided in the side die. The outer wall of the pressing head is in close contact with the inner wall of the piston hole and is slidably matched with the piston hole along the axial direction, so that the front end of the pressing head extends into the local pressurizing area or returns to the piston hole. One end of the connecting rod is connected to the pressing head, and the other end extends outside the side die and is connected to the driver. The driver is configured to drive the connecting rod to reciprocate along the axial direction. The driver drives the pressing head to extend into the local pressurizing area in the product cavity through the connecting rod. Thus, when the molten metal liquid fills the product cavity, pressurization is achieved by the squeezing of the pressing head, so that the strength of the product in this local pressurizing area is higher.

[0007] According to an example of the present invention, the pressurizing mechanism includes a pressing head, a screw rod, and a motor. A piston hole communicating with the local pressurizing area is provided in the side die. The outer wall of the pressing head is in close contact with the inner wall of the piston hole and is slidably matched with the piston hole along the axial direction, so that the front end of the pressing head extends into the local pressurizing area or returns to the piston hole. One end of the screw rod is in threaded transmission with the threaded hole in the pressing head, and the other end extends outside the side die and is in transmission connection with the output shaft of the motor. The motor drives the screw rod to rotate, so that the pressing head extends into the local pressurizing area along the axial direction or returns and retracts through the forward and reverse rotation of the screw rod. Thus, after the molten metal liquid fills the local pressurizing area, pressurization can be achieved through the pressing head.

[0008] According to an example of the present invention, it further includes a controller for opening and closing the pressurizing mechanism. The controller is electrically connected to the pressurizing mechanism. A timing module is integrated in the controller, and the controller receives the time signal of the timing module to control the start and stop of the pressurizing mechanism. Through the timing module, according to the process requirements, when the molten metal liquid fills the product cavity and is in the best semi-solidified state, the controller automatically realizes the pressurization of the local pressurizing area by the pressurizing mechanism, and finally the local pressurizing effect is good.

[0009] According to an example of the present invention, a pressure sensor for detecting the force exerted by the pressing head on the connecting rod is provided between the pressing head and the connecting rod. Through the pressure sensor, the reaction force received by the pressing head when it extends into the local pressurizing area can be detected. Thus, the pressure condition in this local pressurizing area can be fed back in real time, and then the stroke of the pressing head in the pressurizing mechanism can be adjusted according to the pressure feedback data, and finally the pressurizing effect reaches the best.

[0010] According to an example of the present invention, the fixed mold and the movable mold are closed to form an overflow channel communicating with the product cavity. The setting of the overflow channel enables the first-entering part during the injection of the molten metal liquid to overflow into the overflow channel, thereby avoiding product defects caused by the first-entering metal liquid remaining in the product cavity after cooling. In addition, the first-entering metal liquid can bring the impurity particles remaining in the product cavity into the overflow channel together, achieving a self-cleaning effect, and ultimately making the quality of the die-cast product good.

[0011] According to an example of the present invention, the overflow channel includes a front-section channel, a middle-section channel, and a rear-section channel that are sequentially connected. The front-section channel communicates with the product cavity, and the rear port of the middle-section channel connected to the rear-section channel is higher than the front port of the middle-section channel connected to the front-section channel in the vertical direction. Having a middle-section channel that rises upward in the overflow channel enables the bubbles in the metal liquid to quickly rise into the rear-section channel in the middle-section channel, thereby avoiding the bubbles in the overflow channel from flowing back into the product cavity after the metal liquid stands still. In addition, due to the height difference of the middle-section channel, the front-section channel can maintain a certain pressure value even when the rear-section channel is directly connected to the external atmospheric pressure, so that the metal liquid in the product cavity can be statically solidified under a pressure state higher than the external atmospheric pressure, improving the product strength.

[0012] According to an example of the present invention, the rear-section channel of the overflow channel communicates with an exhaust channel, and the exhaust channel is formed by the mating of two sub-modules, and the two sub-modules are respectively connected to the fixed mold and the movable mold.

[0013] According to an example of the present invention, the exhaust channel includes a wave section and an exhaust end. The rear-section channel, the wave section, and the exhaust end are sequentially connected. The wave section is arranged to move reciprocally in the vertical direction and form a wave-shaped structure while extending outward in the horizontal direction. By providing a wave section extending in the horizontal direction at one end in the exhaust channel, the inertia of the molten metal liquid can be reduced when it quickly overflows into the exhaust channel, so that the solidified metal liquid is continuous in the exhaust channel and the overflow channel. In addition, the wave section can make the metal liquid thin and long in the exhaust channel, which is conducive to the rapid cooling of the metal liquid in the wave section. Since the metal liquid in the wave section is quickly cooled and solidified and cooperates with the wave structure of the wave section, a good sealing effect can be formed. At this time, when the pressurizing mechanism pressurizes the local pressurized area in the product cavity, the metal liquid in the wave section has already solidified and sealed the wave section, so that the pressurizing effect of the pressurizing mechanism is good.

[0014] According to an example of the present invention, the connection between the front-section channel and the middle-section channel of the overflow channel has a deep pit groove that is recessed downward in the vertical direction.

[0015] The above technical solution has the following advantages or beneficial effects: First, compared with the casting process of the prior art, the flywheel housing is processed by die casting, which has high production efficiency and is suitable for mass production. At the same time, the injection port of the die-casting mold is located at the center position corresponding to the product cavity on the moving mold. This design can make the molten metal fill the product cavity more efficiently, and the quality of the die-cast product is good. Second, a pressurizing mechanism is set on the mold, so that the local pressurizing area in the product cavity can be locally pressurized through the pressurizing mechanism. Therefore, after the molten metal fills the entire product cavity, it can be locally pressurized by the pressurizing mechanism when it is in a semi-solid state, thereby making the local strength of the final product better. Finally, through the design of the overflow channel and the exhaust channel, the product defects are less and the yield is high.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an axonometric view of the die-casting mold of the flywheel housing of the truck engine of the present invention.

[0018] Figure 2 is a top view of the die-casting mold of the flywheel housing of the truck engine of the present invention.

[0019] Figure 3 is Figure 2 a schematic cross-sectional view in the direction of "A-A" in

[0020] Figure 4 is a schematic structural view of the present invention with the moving mold omitted.

[0021] Figure 5 is Figure 4 a top view of

[0022] Figure 6 is Figure 5 an axonometric schematic view after partial section along the line L-L in

[0023] Figure 7 is Figure 6 a partially enlarged schematic view of the "B" area in

[0024] Figure 8 is a schematic internal structure view of the exhaust channel in the present invention.

[0025] Among them, 1. Fixed mold; 2. Movable mold; 3. Sliding mechanism; 4. Side mold; 5. Product cavity; 6. Injection port; 7. Local pressure boosting area; 8. Pressure boosting mechanism; 9. Extrusion head; 10. Screw; 11. Motor; 12. Piston hole; 13. Overflow channel; 13.1. Front section flow channel; 13.2. Middle section flow channel; 13.3. Rear section flow channel; 13.4. Deep pit groove; 14. Exhaust passage; 14.1. Wave section; 14.2. Exhaust tail end; 15. Upper ejector rod; 16. Lower ejector rod; 17. Upper guide hole; 18. Lower guide hole. Detailed implementation mode

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] The die-casting mold of a truck engine flywheel housing according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0028] Embodiment 1

[0029] The present invention provides a die-casting mold for a truck engine flywheel housing. As shown in the figure, it includes a fixed mold 1, a movable mold 2 arranged above the fixed mold 1. A side mold 4 is arranged between the fixed mold 1 and the movable mold 2. The fixed mold 1, the movable mold 2 and each side mold 4 are closed to form a product cavity 5. Each side mold is driven by its corresponding sliding mechanism 3, and each sliding mechanism 3 is respectively installed on the fixed mold 1. The sliding mechanism 3 drives the corresponding side mold 4 to slide and cooperate with the fixed mold 1, so that during the mold closing process, each side mold can enclose each other to form the side wall of the product cavity and jointly enclose with the fixed mold 1 below and the movable mold 2 above to form a complete product cavity 5. It is characterized in that: an injection port 6 is arranged above the geometric center of the product cavity 5 on the movable mold 2. The injection port 6 penetrates the movable mold 2 from top to bottom until it communicates with the central position of the product cavity 5. Of course, since the product cavity 5 in this embodiment is a flywheel housing and there is a neutral area at its central position, a sub-gate can be arranged in this neutral area. The above injection port 6 extends from top to bottom to form a main gate. After the main gate extends to the central position, it extends into the product cavity 5 through each sub-gate communicating with the main gate. A local pressure boosting area 7 is arranged on the product cavity 5. This local pressure boosting area 7 can be set artificially according to the needs of the product. It can be the area where the product is stressed or impacted more during actual use and has a greater demand for strength. Therefore, during the design of the die-casting mold in this embodiment, a local pressure boosting area 7 can be set in the corresponding area of the product cavity 5, such as Figure 5As shown in the figure, in this embodiment, there are 2 local pressurization areas 7 provided in the product cavity 5, and a pressurization mechanism 8 for increasing the pressure in the local pressurization areas 7 is provided on the fixed mold 1 or the side mold 4.

[0030] Embodiment 2

[0031] As a preference for the pressurization mechanism 8 in the above basic embodiment, the pressurization mechanism 8 in this embodiment includes an extrusion head 9, a connecting rod and a driver. There is a piston hole 12 communicating with the local pressurization area 7 in the side mold 4. The outer wall of the extrusion head 9 is closely attached to the inner wall of the piston hole 12 and is in axial sliding fit with the piston hole 12, so that the front end of the extrusion head 9 extends into the local pressurization area 7 or resets into the piston hole 12. One end of the connecting rod is connected to the extrusion head 9, and the other end extends axially outside the side mold 4 and is connected to the driver. The driver is arranged to drive the connecting rod to move axially back and forth. Specifically, the driver is a crank-slider mechanism driven by a motor. The motor drives the crank to rotate, and the crank drives the slider to move back and forth. Thus, the other end of the connecting rod is connected to the slider. Or the driver is a telescopic cylinder or a telescopic hydraulic cylinder. The piston rod of the telescopic cylinder or the telescopic hydraulic cylinder is fixed to the connecting rod, thereby driving the connecting rod to make an axial reciprocating motion.

[0032] Preferably, a pressure sensor for detecting the force exerted by the extrusion head 9 on the connecting rod is provided between the extrusion head 9 and the connecting rod. That is, the extrusion head 9, the pressure sensor and the connecting rod are connected in sequence. The pressure exerted on the extrusion head 9 by the product cavity 5 is transmitted to the pressure sensor. Through the pressure sensor, the pressure information in the local pressurization area 7 can be obtained in real time. Thus, it is beneficial to adjust the position of the extrusion head 9 at any time, and finally the pressure in the local pressurization area 7 can always be maintained at the set pressure. Since the volume of the molten metal will shrink during the process of cooling and solidifying, the pressure in the local pressurization area 7 will continue to decrease, and the decreasing process is relatively fluctuating. In this embodiment, by detecting the change of the pressure in the local pressurization area 7 in real time, a relatively stable pressure can be always maintained in the local pressurization area 7, so that the strength of the product in this local pressurization area is good after final solidification.

[0033] Embodiment 3

[0034] As a preference for the pressurization mechanism 8 in the above basic embodiment, as Figure 5-7As shown in the figure, the pressure boosting mechanism 8 in this embodiment includes an extrusion head 9, a screw 10, and a motor 11. There is a piston hole 12 in the side mold 4 that communicates with the local pressure boosting area 7. The outer wall of the extrusion head 9 is in close contact with the inner wall of the piston hole 12 and is slidably engaged with the piston hole 12 along the axial direction, so that the front end of the extrusion head 9 extends into the local pressure boosting area 7 or resets into the piston hole 12. The rear end of the extrusion head has a threaded hole, one end of the screw 10 extends into the threaded hole of the extrusion head and is in threaded transmission with the threaded hole. The other end of the screw 10 extends along the axial direction of the piston hole 12 to the outside of the side mold 4 and is in transmission connection with the output shaft of the motor 11. Thus, the forward and reverse rotation of the output shaft of the motor 11 drives the forward and reverse rotation of the screw 10. Finally, the screw 10 makes the extrusion head 9 extend into or retract from the piston hole 12 through the threaded transmission of the threaded hole.

[0035] Embodiment 4

[0036] On the basis of the above embodiments, this embodiment further includes a controller for controlling the pressure boosting mechanism 8. The controller (not shown in the figure) is electrically connected to the pressure boosting mechanism 8. A timing module (not shown in the figure) is integrated in the controller. The controller receives the time signal of the timing module to control the start and stop of the pressure boosting mechanism 8. When the product cavity 5 is filled with molten metal, it needs to be static for a period of time. When the metal liquid in the product cavity 5 is in a semi-solidified state, local pressure boosting is achieved through the pressure boosting mechanism 8. Only in this way can the best local pressure boosting effect be achieved. And manually controlling this time is not only inconvenient but also there is a risk of missing the time. Therefore, under the automatic control of the controller and the timing module in this embodiment, the pressure boosting mechanism can automatically complete the local pressure boosting work according to the time required by the process. Specifically, after the molten metal fills the entire product cavity 5, the timing module starts timing. When the time of the timing module reaches the set time, the timing module sends out a time signal. The controller receives this time signal and sends a control instruction to the pressure boosting mechanism. The pressure boosting mechanism boosts the local pressure boosting area 7 according to the control instruction.

[0037] Embodiment 5

[0038] In die-cast products, air bubbles and cracks are the main product defects. The causes of the above product defects are not only directly related to process parameters such as runner design, feeding flow rate, and temperature of the molten metal, but also related to the fact that the part of the molten metal that first enters the runner is rapidly cooled and then remains in the product cavity. When pouring the molten metal into the injection port, the temperature of the molten metal that first enters the runner drops rapidly when it contacts the relatively cold runner and the product cavity, while the subsequent molten metal is still in a molten state. After the two are statically solidified in the product cavity, the above product defects will occur. Therefore, the improvement of this embodiment lies in: the fixed mold 1 and the movable mold 2 are closed to form an overflow channel 13 communicating with the product cavity 5. In this embodiment, the molten metal that first enters the runner and the product cavity 5 will be squeezed into the overflow channel 13, thus well avoiding the problem of product defects caused by the first-entering molten metal remaining in the product cavity 5.

[0039] Specifically, as Figure 5 shown, the projections of the injection port 6 and the runner on the horizontal plane are located at the central position of the projection of the product cavity 5 on the same horizontal plane. The overflow channel 13 is located on the outer side of the product cavity 5 along the horizontal direction away from the runner, and one end of the overflow channel 13 communicates with the outside of the product cavity.

[0040] Embodiment Six

[0041] As Figure 6 and Figure 7As shown, the overflow channel 13 includes a front-section channel 13.1, a middle-section channel 13.2, and a rear-section channel 13.3 that are connected in sequence. The front-section channel 13.1 is connected to the product cavity 5. The rear port where the middle-section channel 13.2 is connected to the rear-section channel 13.3 is higher than the front port where the middle-section channel 13.2 is connected to the front-section channel 13.1 in the vertical direction. That is, the rear-section channel 13.3 is higher than the front-section channel 13.1 in the vertical direction. Thus, when the molten metal flows from the front-section channel 13.1 into the middle-section channel 13.2, the air contained in the molten metal will quickly enter the middle-section channel 13.2 and the rear-section channel 13.3, and it will not return to the front-section channel 13.1 or even the product cavity 5 after the molten metal stands still. The middle-section channel 13.2 plays an effect of preventing the bubbles from running back. In addition, the position of the front-section channel 13.3 is relatively low. Therefore, when the middle-section channel 13.2 and the rear-section channel 13.3 are both filled with molten metal, the pressure in the front-section channel 13.3 is greater than that in the rear-section channel 13.3 under the action of gravity, thereby achieving a certain degree of pressure-holding effect. In addition, the molten metal in the middle-section channel 13.2 can form a good seal. Since the overflow channel 13 is a long and narrow channel, the molten metal in the overflow channel 13 can cool and solidify faster. At this time, the molten metal in the middle-section channel 13.2 can form a good seal after solidification. When the molten metal in the product cavity 5 is still in a molten state, the middle-section channel 13.2 can play a sealing role. At this time, even when the pressure in the product cavity 5 continues to increase to achieve a good die-casting effect, the molten metal will not leak from the overflow channel 13 due to the increase in pressure.

[0042] Preferably, at the connection between the front-section channel 13.1 and the middle-section channel 13.2 of the overflow channel 13, there is a deep pit groove 13.4 that is recessed downward in the vertical direction.

[0043] Embodiment Seven

[0044] On the basis of the above Embodiment Six, the further improvement of this embodiment lies in that: the rear-section channel 13.3 of the overflow channel 13 is connected to the exhaust channel 14. The exhaust channel 14 is formed by the alignment of two sub-modules, and the two sub-modules are respectively connected to the fixed mold 1 and the movable mold 2. The exhaust channel 14, the overflow channel 13, and the product cavity 5 are connected in sequence. Thus, when the molten metal is poured from the injection port 6 into the runner and then poured into the product cavity 5 through the runner, the air in the product cavity 5 can be discharged through the overflow channel 13 and the exhaust channel 14. Thus, due to the rapid filling of the molten metal in the product cavity 5, and since the exhaust channel 14 is formed by the alignment of two sub-modules, during the mold-opening process of the movable mold 2 and the fixed mold 1, the two sub-modules can be opened synchronously, which is beneficial for the slag in the exhaust channel to be ejected together with the product during mold opening.

[0045] Preferably, as Figure 7As shown, the exhaust passage 14 includes a first sub-module 14.3 and a second sub-module 14.4. The first sub-module 14.3 is fixed to the moving mold 2, and the second sub-module 14.4 is fixed to the stationary mold 1. When the moving mold 2 and the stationary mold 1 are in the closed mold state, the first sub-module 14.3 and the second sub-module 14.4 are closed to form a wave segment 14.1 and an exhaust tail end 14.2. The rear flow passage 13.3, the wave segment 14.1, and the exhaust tail end 14.2 are connected in sequence. The wave segment 14.1 is arranged to move reciprocally in the vertical direction and outward in the horizontal direction to form a wave-shaped structure. For die-casting molds, being able to fill the entire product cavity 5 with molten metal as quickly as possible is an important factor determining the quality of the final die-cast product. Therefore, the molten metal will be injected into the product cavity at a certain flow rate quickly. Since the overflow passage and the exhaust passage are slit structures, when the molten metal in the product cavity 5 enters the overflow passage 13, the molten metal will be further accelerated because it enters from a large space into a small space of the slit. At this time, the molten metal is likely to shoot out from the exhaust passage 14, which not only poses safety hazards and waste of molten metal, but also a large flow rate will cause a large number of bubbles. For this reason, in this embodiment, after the exhaust passage is set as the wave segment 14.1, the length of the extended exhaust passage is reduced, and the probability of the molten metal shooting out is reduced. Moreover, the molten metal can be decelerated in the wave segment 14.1, playing a role in reducing the speed and limiting the flow. In addition, since the wave segment 14.1 of the exhaust passage is an elongated slit structure, the molten metal can be cooled and solidified faster in the wave segment 14.1. The solidified molten metal in a wave shape can well fill the wave segment 14.1, which has better sealing performance compared with a smooth passage. When the molten metal in the wave segment 14.1 cools from the molten state to the solidified or semi-solidified state, the molten metal in the product cavity is still in the molten state. At this time, since the exhaust passage 14 has been well sealed, the product cavity 5 can be pressurized to a higher pressure, which is beneficial to improving the product quality. Or during the process of the pressurizing mechanism pressurizing the local pressurized area 7 in the product cavity 5, the sealing of the exhaust passage 14 can also make the local pressurized area 7 have a better pressure holding effect, and finally make the local pressurizing effect good.

[0046] Embodiment VIII

[0047] Based on the above-mentioned seventh embodiment, there will be surplus material on the outer side of the product after die-casting. This surplus material is formed after the molten metal in the overflow channel and the exhaust channel solidifies. Especially for the exhaust channel, which extends horizontally for a relatively long distance, the surplus material generated by this exhaust channel will apply a downward moment to the side wall of the product under its own gravity. When the gravity of the surplus material is large and the length is long, the increase of this moment will cause a risk of bending deformation on the side wall of the product. Especially for the thin-walled or hole-structured areas on the side wall of the product, the moment applied by the surplus material to the product will cause complete deformation of the product during mold opening. Therefore, the improvement of this embodiment lies in setting a material-breaking mechanism at the position of each exhaust channel 14 in the mold. This material-breaking mechanism truncates the surplus material in the exhaust channel 14 or forms a breaking groove before the moving mold 2 and the fixed mold 1 are opened. Thus, when the ejecting mechanism ejects the product from the product cavity 5 after mold opening, the excess surplus material can be well separated from the product, thereby ensuring that there is less surplus material left on the product and effectively avoiding the risk of bending deformation of the product side wall caused by the overlong and overweight surplus material. Specifically, the material-breaking mechanism includes an upper ejector rod 15 and a lower ejector rod 16. An upper guiding hole 17 is provided in the first sub-module 14.3 of the exhaust channel. The upper ejector rod 15 is slidably fitted in the upper guiding hole 17. A lower guiding hole 18 is provided in the second sub-module 14.4. The lower ejector rod 16 is slidably fitted in the lower guiding hole 18. An upper driver for driving the upper ejector rod 15 to move up and down in the vertical direction is provided on the moving mold 2, and a lower driver for driving the lower ejector rod 16 to move up and down in the vertical direction is provided on the fixed mold 1. The two drivers can be hydraulic cylinders. The piston rods of the hydraulic cylinders drive the corresponding upper ejector rod 15 and lower ejector rod 16 to move up and down in the vertical direction through connecting rods. The upper ejector rod 15 and the lower ejector rod 16 are coaxial. Before the molten metal in the molten state flows into the exhaust channel 14, a gap equal to the width of the exhaust channel is left between the lower end surface of the upper ejector rod 15 and the upper end surface of the upper ejector rod 16, so that the molten metal can flow smoothly in the exhaust channel. When the molten metal in the exhaust channel solidifies, the two hydraulic cylinders respectively drive the upper ejector rod 15 and the lower ejector rod 16 to move synchronously, thereby cutting off the solidified molten metal in the exhaust channel 14 along the positions of the upper ejector rod 15 and the lower ejector rod 16.

[0048] Preferably, one of the two drivers is a hydraulic cylinder and the other is a return spring. The hydraulic cylinder drives the corresponding upper ejector rod 15 to move downward or drives the lower ejector rod 16 to move upward, thereby overcoming the return spring to complete the cutting of the surplus material in the exhaust channel.

[0049] Furthermore, the apertures of the two guiding holes are the same, or the aperture of the lower guiding hole 18 is larger than the aperture of the upper guiding hole 17. The upper ejector rod 15 moves downward until the front end of the upper ejector rod 15 extends into the lower guiding hole 18, so that the solidified surplus material in the exhaust channel 14 breaks under the shearing force of the upper ejector rod 15.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0051] For those skilled in the art, various changes and modifications will undoubtedly be obvious after reading the above description. Therefore, the appended claims should be regarded as covering all changes and modifications that embrace the true spirit and scope of the present invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to still fall within the spirit and scope of the present invention.

Claims

1. A die-casting mold for a flywheel housing of a truck engine, which comprises a fixed mold (1), a moving mold (2) arranged above the fixed mold (1), a plurality of side molds (4) driven by a sliding mechanism (3) are arranged between the fixed mold (1) and the moving mold (2), the sliding mechanism (3) is installed on the fixed mold (1), the sliding mechanism (3) drives the corresponding side mold (4) to be slidably matched with the fixed mold (1), the fixed mold (1), the moving mold (2) and each side mold (4) are closed to form a product cavity (5), and it is characterized in that: A pouring port (6) is provided above the geometric center of the product cavity (5) on the moving mold (2). The pouring port (6) penetrates through the moving mold (2) until it communicates with the central position of the product cavity (5). A local pressurizing area (7) is provided on the product cavity (5), and a pressurizing mechanism (8) for increasing the pressure in the local pressurizing area (7) is provided on the fixed mold (1) or the side mold (4). The fixed mold (1) and the moving mold (2) are closed to form an overflow channel (13) communicating with the product cavity (5). The overflow channel (13) includes a front section flow channel (13.1), a middle section flow channel (13.2), and a rear section flow channel (13.3) that are sequentially connected. The front section flow channel (13.1) communicates with the product cavity (5), and the rear port where the middle section flow channel (13.2) is connected to the rear section flow channel (13.3) is higher than the front port where the middle section flow channel (13.2) is connected to the front section flow channel (13.1) in the vertical direction. The rear section flow channel (13.3) of the overflow channel (13) communicates with an exhaust channel (14). The exhaust channel (14) is formed by the mating of two sub-modules, and the two sub-modules are respectively connected to the fixed mold (1) and the moving mold (2). The die-casting mold further includes a blanking mechanism. The blanking mechanism includes an upper ejector rod (15) and a lower ejector rod (16). An upper guiding hole (17) is provided in the first sub-module (14.3) of the exhaust channel. The upper ejector rod (15) is slidably fitted in the upper guiding hole (17). A lower guiding hole (18) is provided in the second sub-module (14.4) of the exhaust channel. The lower ejector rod (16) is slidably fitted in the lower guiding hole (18). An upper driver for driving the upper ejector rod (15) to move up and down in the vertical direction is provided on the moving mold (2), and a lower driver for driving the lower ejector rod (16) to move up and down in the vertical direction is provided on the fixed mold (1). The upper ejector rod (15) and the lower ejector rod (16) are coaxial.

2. The die-casting mold for the flywheel housing of a truck engine according to claim 1, wherein: The pressurizing mechanism (8) includes a pressing head (9), a connecting rod, and a driver. A piston hole (12) communicating with the local pressurizing area (7) is provided in the side mold (4). The outer wall of the pressing head (9) is in close contact with the inner wall of the piston hole (12) and is slidably fitted with the piston hole (12) along the axial direction, so that the front end of the pressing head (9) extends into the local pressurizing area (7) or returns to the piston hole (12). One end of the connecting rod is connected to the pressing head (9), and the other end extends outside the side mold (4) and is connected to the driver. The driver is arranged to drive the connecting rod to reciprocate axially.

3. The die-casting mold for the flywheel housing of a truck engine according to claim 1, characterized in that: The pressurizing mechanism (8) includes an extrusion head (9), a screw rod (10), and a motor (11). A piston hole (12) communicating with the local pressurizing area (7) is provided in the side die (4). The outer wall of the extrusion head (9) is in close contact with the inner wall of the piston hole (12) and is slidably engaged with the piston hole (12) along the axial direction, so that the front end of the extrusion head (9) extends into the local pressurizing area (7) or returns to the piston hole (12). One end of the screw rod (10) is in threaded transmission with a threaded hole in the extrusion head (9), and the other end extends outside the side die (4) and is in transmission connection with the output shaft of the motor (11).

4. The die-casting mold for the flywheel housing of a truck engine according to any one of claims 1-3, characterized in that: It further includes a controller for opening and closing the pressurizing mechanism (8). The controller is electrically connected to the pressurizing mechanism (8). A timing module is integrated in the controller, and the controller receives the time signal of the timing module to control the start and stop of the pressurizing mechanism (8).

5. The die-casting mold for the flywheel housing of a truck engine according to claim 2, wherein: A pressure sensor for detecting the force exerted by the extrusion head (9) on the connecting rod is provided between the extrusion head (9) and the connecting rod.

6. The die-casting mold for the flywheel housing of a truck engine according to claim 1, characterized in that: The exhaust passage (14) includes a first sub-module (14.3) and a second sub-module (14.4). The first sub-module (14.3) is fixed to the moving die (2), and the second sub-module (14.4) is fixed to the stationary die (1). When the moving die (2) and the stationary die (1) are in the closed die state, the first sub-module (14.3) and the second sub-module (14.4) are closed to form a wave segment (14.1) and an exhaust tail end (14.2). The rear section flow channel (13.3), the wave segment (14.1), and the exhaust tail end (14.2) are connected in sequence. The wave segment (14.1) is arranged to move reciprocally along the horizontal direction outward and along the vertical direction to form a wave-shaped structure.

7. The die-casting mold for the flywheel housing of a truck engine according to claim 1, characterized in that: A deep pit groove (13.4) recessed downward in the vertical direction is provided at the connection between the front section flow channel (13.1) and the middle section flow channel (13.2) of the overflow channel (13).

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