A lost foam casting device for the casting of the motor housing of a three-wheel heavy-duty motorcycle

Abstract

The present invention provides a lost foam casting device for casting a motor shell of a three-wheel heavy-duty motorcycle, which is applied to the field of lost foam casting. The device includes a mold, a guiding mechanism and an adjusting mechanism. The mold includes a lower mold body and an upper mold body. A lower mold core is arranged in the lower mold body, and the lower mold core includes a lower mold shell and a convex mold shell. An upper sand groove is arranged in the upper mold body, and an upper mold core is arranged in the upper sand groove. The upper mold core includes an upper mold shell and a concave shell mold. After the convex mold shell and the concave shell mold are aligned, a cavity matching the pattern is formed. The guiding mechanism is used to maintain the alignment accuracy between the lower mold body and the upper mold body, and the adjusting mechanism is used to adjust the distance between the lower mold shell and the upper mold shell. Through the synergistic action of the guiding mechanism, the alignment pins and the alignment grooves, the present invention realizes the high-precision alignment between the lower mold body and the upper mold body, improves the structural stability of the pattern coated with refractory coating, effectively improves the filling effect of the molten metal, thereby improving the forming quality and qualification rate of the casting, reducing the production cost, and improving the economic benefits of the enterprise.

Description

Technical Field

[0001] The present application relates to the field of lost foam casting, and in particular to a lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle. Background Art

[0002] With the rapid development of the three-wheeled heavy-duty motorcycle industry, higher requirements are placed on the quality and production efficiency of the motor housing of three-wheeled heavy-duty motorcycles. The traditional casting method has many shortcomings when producing the motor housing of three-wheeled heavy-duty motorcycles.

[0003] For example, the accuracy of the casting mold is difficult to ensure, resulting in large dimensional deviations of the motor housing, affecting the assembly and performance of the motor; during the casting process, problems with the filling and exhaust of the molten metal can easily cause defects such as pores and sand holes to appear inside the casting, reducing the product's qualification rate; and the traditional casting process has low production efficiency and is unable to meet the growing market demand.

[0004] As an advanced casting technology, lost foam casting has solved some problems of traditional casting to a certain extent. However, the existing lost foam casting device still has some defects for relatively complex castings such as the motor housing of three-wheeled heavy-duty motorcycles.

[0005] For example, the mold matching accuracy is difficult to ensure, which can easily lead to defects such as misalignment in castings; the spacing adjustment between the various parts of the mold is not flexible enough to meet the production needs of motor casings of different specifications; in addition, in the pouring preparation stage, the surface of the mold needs to be coated with refractory coating. The traditional coating method is to place the trimmed mold in a coating pool and repeatedly turn the mold over to apply the refractory coating. In this process, since the mold is usually made of foam plastic material, it has a certain buoyancy in the coating pool. The mold is subjected to uneven buoyancy and artificial turning force during the turning process, which can easily cause the mold to deform and affect the quality of the casting.

[0006] For this purpose, a lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle is proposed. Summary of the invention

[0007] The purpose of the present application is to solve the technical problem that the mold in lost foam casting is easy to deform when the refractory coating is applied, resulting in poor casting molding. Compared with the prior art, a lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle is provided, including a mold, a guide mechanism and an adjustment mechanism. The mold includes a lower mold body and an upper mold body, a lower sand groove is provided in the lower mold body, a lower mold core is provided in the lower sand groove, and the lower mold core includes a lower mold shell slidably connected in the lower sand groove, a lower mold groove is provided on the top of the lower mold shell, and a convex mold shell matching with it is detachably connected in the lower mold groove;

[0008] An upper sand groove is provided in the upper mold body, an upper mold core is provided in the upper sand groove, and the upper mold core includes an upper mold shell slidably connected in the upper sand groove, an upper mold groove is provided at the bottom of the upper mold shell, and a concave shell mold matching with the upper mold groove is detachably connected in the upper mold groove;

[0009] The male shell and the female shell mold are matched to form a cavity matching the pattern;

[0010] The guiding mechanism is used to maintain the matching accuracy between the lower mold body and the upper mold body, and the adjusting mechanism is used to adjust the distance between the lower mold shell and the upper mold shell.

[0011] Further, the two groups of guide mechanisms are symmetrically arranged on the upper and lower sides away from the lower mold body and the upper mold body, the guide mechanism includes a fixed frame, four groups of guide rods are arranged between the two groups of fixed frames, the fixed frame is provided with straight grooves corresponding to the guide rods, and the lower mold body and the upper mold body are both provided with first card slots corresponding to the guide rods;

[0012] The two sets of fixed frames are rotatably connected to the sides away from each other with guide frames, and the guide frames are provided with adjustment arc grooves for adjusting the position of the guide rods in the straight grooves. The rotation of the guide frames and the spacing adjustment between the lower mold body and the upper mold body are driven by a hydraulic mechanism.

[0013] Furthermore, two groups of symmetrically arranged mating pins are provided at the bottom of the upper mold body, and mating grooves matching with the mating pins are provided at the top of the lower mold body.

[0014] Further, the two groups of adjustment mechanisms are symmetrically arranged on the side away from the two groups of guide mechanisms, the adjustment mechanism includes an adjustment frame, the four corners of the adjustment frame are provided with third card slots corresponding to the guide rods, the adjustment frame is fixedly connected to the lower mold shell or the upper mold shell, and the two groups of adjustment frames are fixed with electromagnetic rings on the side away from each other;

[0015] A limiting door frame is fixed on the first slot of the lower mold body or the upper mold body, and a second slot matching the guide rod is provided on one side of the limiting door frame. A tensioning spring is clamped between the second slot and the third slot, and the tensioning spring is sleeved on the guide rod.

[0016] Furthermore, the magnetic poles and magnetic force of the electromagnetic ring can be changed by adjusting the direction and magnitude of the current, and the tension spring has an elastic force that drives the lower mold shell and the upper mold shell to move closer together.

[0017] Furthermore, an upper heat dissipation grille is provided on one side of the upper mold shell away from the upper mold groove, and a casting mold tube is provided inside the upper heat dissipation grille. The number of the casting mold tubes is three groups evenly divided at equal angles, and the casting mold tube is connected to the upper mold groove;

[0018] A lower heat dissipation grille is provided on one side of the lower mold shell away from the upper groove.

[0019] Furthermore, after surface finishing, the pattern is equipped with three groups of sprue tubes corresponding to the casting mold tube, and the outer diameter of the sprue tube is smaller than the inner diameter of the casting mold tube.

[0020] Furthermore, the surface of the pattern is coated with a refractory coating, the thickness of the male shell and the female shell mold are equal to the coating thickness of the refractory coating, and the radius difference between the sprue tube and the casting mold tube is equal to the coating thickness of the refractory coating;

[0021] The inner cavity after the lower groove and the upper groove are matched with the outer contour of the pattern coated with the refractory coating.

[0022] Furthermore, a sand injection interface and a negative pressure interface are provided on one side of the lower mold body and the upper mold body, and the sand injection interface and the negative pressure interface are respectively connected to the lower sand trough or the upper sand trough.

[0023] Furthermore, the inner walls of the lower sand trough, the lower molding trough, the upper sand trough and the upper molding trough are all coated with an anti-stick coating.

[0024] Compared with the prior art, the advantages of this application are:

[0025] The present invention realizes high-precision alignment of the lower mold body and the upper mold body through the coordinated action of the guiding mechanism, the alignment pins and the alignment grooves. The design of the electromagnetic ring and the tensioning spring in the adjustment mechanism allows the spacing between the lower mold shell and the upper mold shell to be flexibly and accurately adjusted according to different production requirements. The evenly distributed design of multiple groups of casting mold tubes allows the molten metal to flow into the mold cavity more evenly, effectively improving the filling effect of the molten metal, thereby improving the molding quality and the qualified rate of the casting, reducing the production cost, and improving the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the front structure of this application;

[0027] Figure 2 This is a schematic diagram of the bottom structure of this application;

[0028] Figure 3 It is a schematic diagram of the explosion structure of the lower mold core proposed in this application;

[0029] Figure 4 It is a structural schematic diagram of the lower heat dissipation grille proposed in this application;

[0030] Figure 5 It is a schematic diagram of the explosion structure of the upper mold core proposed in this application;

[0031] Figure 6 It is a schematic diagram of the structure of the upper heat dissipation grille proposed in this application;

[0032] Figure 7 It is a schematic diagram of the structure of the guide frame proposed in this application;

[0033] Figure 8 It is a schematic diagram of the exploded structure of the guide frame proposed in this application;

[0034] Fig. 9 It is a schematic diagram of the exploded structure of the regulating mechanism proposed in this application;

[0035] Fig.10 This is a schematic diagram of the state when the guide frame proposed in this application locks the guide rod;

[0036] Fig.11 This is a schematic diagram of the state of the guide frame proposed in this application when the guide rod is loosened;

[0037] Fig.12 It is a structural schematic diagram of the upper mold body proposed in this application;

[0038] Fig.13 This is a schematic diagram of the cross-sectional structure of the injection molding of this application;

[0039] Fig.14 This is a schematic diagram of the cross-sectional structure when a refractory coating is applied to the surface of a mold in this application;

[0040] Fig.15 A schematic diagram showing the comparison of the model proposed in this application before and after the refractory coating is applied;

[0041] Fig.16 This is a schematic diagram of the state of adjusting the distance between the concave shell mold and the convex shell mold in this application.

[0042] Description of the numbers in the figure:

[0043] 1. mold; 101. first card slot; 102. sand injection interface; 103. negative pressure interface; 11. lower mold body; 111. lower sand groove; 112. matching groove; 12. upper mold body; 121. upper sand groove; 122. matching pin;

[0044] 2. lower mold core; 21. lower mold shell; 211. lower mold groove; 22. lower heat dissipation grille; 23. convex mold shell;

[0045] 3. Upper mold core; 31. Upper mold shell; 311. Upper mold groove; 32. Concave shell mold; 33. Upper heat dissipation grille; 34. Casting mold tube;

[0046] 4. Position-limiting door frame; 41. Second card slot; 42. Tension spring;

[0047] 5. Guide mechanism; 51. Guide frame; 511. Adjusting arc slot; 52. Fixed frame; 53. Guide rod; 521. Straight slot;

[0048] 6. Adjustment mechanism; 61. Adjustment frame; 611. Third card slot; 62. Electromagnetic ring;

[0049] 7. Pattern; 71. Sprue pipe; 72. Refractory coating. DETAILED DESCRIPTION

[0050] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0051] Example:

[0052] The present invention provides a lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle. Figure 1 - Fig.16 The present invention comprises a mold 1 composed of a lower mold body 11 and an upper mold body 12. The lower mold body 11 and the upper mold body 12 work together to provide an accurate cavity for casting the motor housing. A lower sand groove 111 is designed in the lower mold body 11. The function of the lower sand groove 111 is to provide an installation and positioning space for the lower mold core 2.

[0053] The lower mold core 2 includes a lower mold shell 21 slidably connected in the lower sand groove 111. This sliding connection method not only ensures the stability of the lower mold shell 21, but also allows its position to be adjusted within a certain range to meet the filling requirements of molding sand of different capacities.

[0054] The top of the lower mold shell 21 is provided with a lower mold groove 211, which is a key part for forming the refractory coating 72 on the surface of the mold 7, and a matching male mold shell 23 is detachably connected therein. This detachable connection method greatly improves the versatility and flexibility of the mold, and the user can conveniently and quickly replace the male mold shell 23 according to the shape and size requirements of different models of motor shells, thereby realizing diversified production.

[0055] Correspondingly, an upper sand groove 121 is provided in the upper mold body 12, and the upper sand groove 121 provides an installation basis for the upper mold core 3. The upper mold core 3 includes an upper mold shell 31 slidably connected in the upper sand groove 121, and the bottom of the upper mold shell 31 is also provided with an upper mold groove 311, and a concave shell mold 32 matching with it is detachably connected in the upper mold groove 311.

[0056] Please refer to the Fig.13After the male mold shell 23 and the female shell mold 32 are matched, a cavity matching the pattern 7 is accurately formed. Compared with the traditional method of injecting the pattern 7, the present invention can directly inject the pattern 7 in the cavity of the two by matching the male mold shell 23 and the female shell mold 32, thereby providing an accurate spatial model for the injection molding pattern 7. At the same time, the male mold shell 23 and the female shell mold 32 are both made of thin plate stamping. Compared with the traditional injection mold's fine processing operation on the injection molding cavity, the present application only needs to process the corresponding stamping mold to stamp multiple sets of male mold shells 23 and female shell molds 32, which has low manufacturing cost and is convenient for the rapid preparation of the pattern 7. At the same time, in the process of injecting the pattern 7, the upper mold groove 311 and the lower mold groove 211 are used to provide support to prevent injection molding deformation.

[0057] In order to ensure high-precision alignment of the lower mold body 11 and the upper mold body 12 during the mold closing process, the present invention designs two sets of guide mechanisms 5 symmetrically arranged on the upper and lower sides of the lower mold body 11 and the upper mold body 12. Each set of guide mechanisms 5 includes a fixed frame 52, and four sets of guide rods 53 are evenly distributed between the two sets of fixed frames 52. These guide rods 53 play a key positioning and guiding role. The fixed frame 52 is provided with a straight groove 521 corresponding to the guide rod 53, and the lower mold body 11 and the upper mold body 12 are both provided with a first card slot 101 corresponding to the guide rod 53. Through the cooperation of the guide rod 53 and the first card slot 101, the precise alignment of the lower mold body 11 and the upper mold body 12 in the vertical direction is achieved.

[0058] Furthermore, the two sets of fixed frames 52 are both rotatably connected to the side away from each other with a guide frame 51, and the guide frame 51 is provided with an adjustment arc groove 511 for adjusting the position of the guide rod 53 in the straight groove 521. This design makes the position adjustment of the guide rod 53 more flexible and accurate. By rotating the guide frame 51 to adjust the position of the guide rod 53, the lower mold body 11 and the upper mold body 12 can be quickly disassembled, further improving the convenience of use. Specifically, the rotation of the guide frame 51 and the spacing adjustment between the lower mold body 11 and the upper mold body 12 are driven by a hydraulic mechanism.

[0059] In order to further improve the accuracy and stability of the matching of the upper mold body 12 and the lower mold body 11, two groups of symmetrically arranged matching pins 122 are provided at the bottom of the upper mold body 12, and the top of the lower mold body 11 is correspondingly provided with matching grooves 112 that match the matching pins 122. During the mold closing process, the matching pins 122 can be accurately inserted into the matching grooves 112 to form mechanical positioning, effectively preventing the mold from deflecting and shaking during the matching process, thereby greatly improving the matching accuracy.

[0060] The two groups of adjustment mechanisms 6 are symmetrically arranged on the side away from the two groups of guide mechanisms 5, and work together with the guide mechanism 5 to achieve precise adjustment of the mold spacing. The adjustment mechanism 6 includes an adjustment frame 61, and the four corners of the adjustment frame 61 are provided with third card slots 611 corresponding to the guide rod 53. Through the cooperation of the third card slots 611 and the guide rod 53, the adjustment frame 61 can slide along the guide rod 53, thereby achieving position adjustment. The adjustment frame 61 is fixedly connected to the lower mold shell 21 or the upper mold shell 31, ensuring that the movement of the adjustment frame 61 can be accurately transmitted to the mold component. An electromagnetic ring 62 is fixed on the side away from the two groups of adjustment frames 61, and the magnetic poles and magnetic force of the electromagnetic ring 62 can be accurately changed by adjusting the current direction and current size.

[0061] The first slot 101 of the lower mold body 11 or the upper mold body 12 is fixed with a limit gate frame 4, and a second slot 41 matching the guide rod 53 is provided on one side of the limit gate frame 4. A tension spring 42 is also clamped between the structure and the third slot 611, and the tension spring 42 is sleeved on the guide rod 53. The tension spring 42 has an elastic force that drives the lower mold shell 21 and the upper mold shell 31 to approach each other. In the initial state, the tension spring 42 provides a preload force to keep the mold parts in a certain relative position. When the mold spacing needs to be adjusted, the elastic force of the tension spring 42 can be balanced or overcome by changing the magnetic force size and direction of the electromagnetic ring 62, thereby realizing flexible adjustment of the spacing between the lower mold shell 21 and the upper mold shell 31.

[0062] An upper heat dissipation grille 33 is provided on one side of the upper mold shell 31 away from the upper mold groove 311. The design of the upper heat dissipation grille 33 not only helps to dissipate heat of the mold during the casting process, but also provides installation space for the pouring mold tube 34. Three groups of pouring mold tubes 34 are arranged in the upper heat dissipation grille 33 and are evenly divided at equal angles. The pouring mold tubes 34 are connected to the upper mold groove 311 to ensure that the refractory coating can smoothly flow from the pouring mold tube 34 into the mold cavity. At the same time, three groups of evenly distributed runners are formed on the outer wall of the sprue tube 71 of the mold 7. This evenly distributed design can make the molten metal flow into the mold cavity more evenly during the pouring process, avoiding the local accumulation and uneven flow of the molten metal in the mold cavity, thereby improving the quality of the casting.

[0063] A lower heat dissipation grille 22 is provided on one side of the lower mold shell 21 away from the upper mold groove 311. This structure cooperates with the design of the upper mold shell 31 to further optimize the overall structure of the mold and ensure the smooth casting process and the molding quality of the casting.

[0064] The pattern 7 is a key component of lost foam casting, and its quality and structure directly affect the quality of the casting. In the present invention, the surface of the pattern 7 is coated with a refractory coating 72. After the surface is trimmed, the pattern 7 is equipped with three groups of sprue tubes 71 corresponding to the casting mold tube 34. The outer diameter of the sprue tube 71 is smaller than the inner diameter of the casting mold tube 34. This size design ensures that the refractory coating can smoothly flow into the casting mold tube 34 and the sprue tube 71 under the action of gravity and pressure, and form a refractory coating 72 on the outer wall of the sprue tube 71.

[0065] The thickness of the male shell 23 and the female shell 32 are designed to be equal to the coating thickness of the refractory coating 72, and the radius difference between the sprue tube 71 and the casting mold tube 34 is also equal to the coating thickness of the refractory coating 72. The inner cavity after the lower groove 211 and the upper groove 311 are aligned matches the outer contour of the pattern 7 coated with the refractory coating 72.

[0066] For details, please refer to Fig.14 - Fig.15 After the surface of the mold 7 is trimmed, the male mold shell 23 on the lower mold shell 21 is removed first. At this time, the mold 7 is placed between the upper mold shell 31 and the lower mold shell 21, and refractory coating is added from the casting mold tube 34. At this time, the downward refractory coating moves down to the lower mold groove 211, and the buoyancy of the refractory coating on the mold 7 is used to move the mold 7 upward and match it with the concave shell mold 32. The lower heat dissipation grille 22 and the refractory coating stored in the lower mold groove 211 are evenly heated by an external heat source to perform a drying operation.

[0067] After the refractory coating in the lower groove 211 is dry, the upper mold shell 31 is opened, the sprue tube 71 is installed on the pattern 7, and the concave shell mold 32 in the upper mold shell 31 is removed. At this time, the upper mold shell 31 and the lower mold shell 21 are aligning, and the refractory coating is again added from the gap between the sprue tube 71 and the casting mold tube 34. Since the part of the pattern 7 in the lower groove 211 has been formed with the refractory coating 72 at this time, the refractory coating will only accumulate in the upper groove 311 after the concave shell mold 32 is removed. Therefore, the pattern 7 will not be deformed due to uneven force caused by the upward buoyancy. Similarly, an external heat source is used to uniformly heat the upper heat dissipation grille 33 and the refractory coating stored in the upper groove 311, and at the same time, the refractory coating between the sprue tube 71 and the casting mold tube 34 is also dried, and finally a complete and uniform refractory coating 72 is formed on the surface of the pattern 7.

[0068] Please refer to the Fig.12 The lower mold body 11 and the upper mold body 12 are both provided with a sand injection interface 102 and a negative pressure interface 103 on one side. These two interfaces are indispensable parts in the lost foam casting process. The sand injection interface 102 is connected to the lower sand trough 111 or the upper sand trough 121. The sand injection interface 102 can be used to quickly and evenly fill the sand trough with molding sand, providing the necessary support and molding environment for the casting process;

[0069] For details, please refer to Fig.16 After the refractory coating 72 is formed on the surface of the mold 7, the support structure is used to maintain the relative position of the mold 7 with the lower mold body 11 and the upper mold body 12 while keeping the lower mold body 11 and the upper mold body 12 aligned. At this time, the two sets of electromagnetic rings 62 are energized to generate repulsive magnetic fields, so that the upper mold shell 31 and the lower mold shell 21 are displaced away from each other and the tension spring 42 is compressed to store elastic potential energy, so that a sand filling gap appears between the lower sand groove 111, the upper sand groove 121 and the mold 7, and a proper amount of molding sand is filled into the sand filling gap through the sand injection interface 102;

[0070] At this time, the magnetic fields of the two groups of electromagnetic rings 62 are changed so that there is a magnetic attraction between the two. With the elastic potential energy released by the tensioning spring 42, the upper mold shell 31 and the lower mold shell 21 are aligned again, thereby preliminarily compacting the molding sand. Then, the high-frequency and small-amplitude magnetic field strength changes of the electromagnetic ring 62 are used to make the upper mold shell 31 move up and then press down (due to the weight of the lower mold body 11 and the molding sand, the tensioning spring 42 at the lower mold body 11 is compressed to the designed stroke. Therefore, in this process, the lower mold shell 21 no longer moves), and the molding sand in the sand filling gap is gradually compacted. Since the upper mold shell 31 and the lower mold shell 21 are respectively provided with upper mold grooves 311 and lower mold grooves 211 corresponding to the surface of the mold 7, during the compaction process, the pressure applied to the molding sand at various locations on the surface of the mold 7 is kept uniform, thereby improving the compaction and uniformity of the molding sand, providing uniform support force for the casting of the mold 7, and providing a basis for the uniformity of heat dissipation after subsequent casting.

[0071] The negative pressure interface 103 is also connected to the sand trough, and is used to connect the negative pressure system. During the casting process, after the negative pressure system is started, a certain negative pressure environment will be formed in the sand trough. The existence of the negative pressure environment can further enhance the compactness between the molding sands, improve the strength and stability of the mold, prevent the erosion of the molten metal during the pouring process from causing the molding sand to collapse, and at the same time facilitate the smooth discharge of the gas generated by the pyrolysis of the mold, reduce defects such as pores and sand holes in the casting, and improve the quality of the casting.

[0072] In order to facilitate the cleaning and maintenance of the mold and to increase the service life of the mold, the inner walls of the lower sand trough 111, the lower mold trough 211, the upper sand trough 121 and the upper mold trough 311 are coated with an anti-stick coating. The anti-stick coating can effectively prevent the molding sand and the molten metal from adhering to the inner wall of the mold. After the casting is completed, the cleaning of the mold becomes simpler and more efficient, which reduces the time and labor cost in the mold cleaning process, and also extends the service life of the mold and reduces the production cost.

[0073] The present invention realizes high-precision alignment of the lower mold body 11 and the upper mold body 12 through the synergistic effect of the guide mechanism 5, the alignment pin 122, and the alignment groove 112. The cooperation of the guide rod 53 and the first clamping groove 101 in the guide mechanism 5, as well as the design of the guide frame 51 and the adjustment arc groove 511, can accurately adjust and control the alignment position of the mold to ensure that there will be no misalignment during the mold closing process. The mechanical positioning effect of the alignment pin 122 and the alignment groove 112 further enhances the accuracy and stability of the alignment, thereby improving the dimensional accuracy and quality of the casting and reducing the scrap rate caused by inaccurate alignment.

[0074] The innovative design of the electromagnetic ring 62 and the tension spring 42 in the adjustment mechanism 6 enables the spacing between the lower mold shell 21 and the upper mold shell 31 to be flexibly and accurately adjusted according to different production requirements. By changing the magnetic force size and direction of the electromagnetic ring 62, the elastic force of the tension spring 42 can be easily balanced or overcome to achieve fine adjustment of the mold spacing. This flexible spacing adjustment function enables the device to adapt to the production of motor housings of three-wheeled load-carrying motorcycles of various specifications and sizes, improves the versatility and flexibility of the device, reduces the number of times the mold needs to be replaced due to inappropriate mold spacing, and improves production efficiency.

[0075] The uniform distribution design of multiple groups of pouring mold tubes 34 enables the molten metal to flow into the mold cavity more evenly, effectively improving the filling effect of the molten metal and reducing defects such as pores and shrinkage cavities inside the casting. The refractory coating 72 on the surface of the pattern 7 and the precise design of the relevant structural dimensions ensure that the pattern 7 can be stably vaporized and disappeared during the pouring process, and the molten metal can smoothly fill the mold cavity, thereby improving the molding quality and qualified rate of the casting, reducing production costs, and improving the economic benefits of the enterprise.

[0076] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle, comprising a mold, a guide mechanism and an adjustment mechanism, characterized in that: The mold comprises a lower mold body and an upper mold body, wherein the lower mold body is provided with a lower sand groove, wherein the lower sand groove is provided with a lower mold core, wherein the lower mold core comprises a lower mold shell slidably connected in the lower sand groove, wherein a lower mold groove is provided with a lower mold groove, wherein a male mold shell matching the lower mold groove is detachably connected therein; An upper sand groove is provided in the upper mold body, an upper mold core is provided in the upper sand groove, and the upper mold core includes an upper mold shell slidably connected in the upper sand groove, an upper mold groove is provided at the bottom of the upper mold shell, and a concave shell mold matching with the upper mold groove is detachably connected in the upper mold groove; The male shell and the female shell mold are matched to form a cavity matching the pattern; The guide mechanism is used to maintain the matching accuracy between the lower mold body and the upper mold body, and the adjustment mechanism is used to adjust the distance between the lower mold shell and the upper mold shell; The two groups of adjustment mechanisms are symmetrically arranged on the side away from the two groups of guide mechanisms, the adjustment mechanism comprises an adjustment frame, the four corners of the adjustment frame are provided with a third slot, the adjustment frame is fixedly connected to the lower mold shell or the upper mold shell, and the two groups of adjustment frames are fixed with an electromagnetic ring on the side away from each other; A limiting door frame is fixed on the lower mold body or the upper mold body, a second clamping slot is provided on one side of the limiting door frame, and a tensioning spring is clamped between the second clamping slot and the third clamping slot.

2. The lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle according to claim 1 is characterized in that: The two groups of guide mechanisms are symmetrically arranged on the upper and lower sides away from the lower mold body and the upper mold body, and the guide mechanism includes a fixed frame, four groups of guide rods are arranged between the two groups of fixed frames, and the fixed frame is provided with straight grooves corresponding to the guide rods, and the lower mold body and the upper mold body are both provided with first card slots corresponding to the guide rods; The two sets of fixed frames are rotatably connected to the sides away from each other with guide frames, and the guide frames are provided with adjustment arc grooves for adjusting the position of the guide rods in the straight grooves. The rotation of the guide frames and the spacing adjustment between the lower mold body and the upper mold body are driven by a hydraulic mechanism.

3. The lost foam casting device for casting the motor housing of a three-wheeled heavy-duty motorcycle according to claim 2 is characterized in that: The bottom of the upper mold body is provided with two groups of symmetrically arranged matching pins, and the top of the lower mold body is provided with matching grooves matched with the matching pins.

4. The lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle according to claim 2, characterized in that: The third slot corresponds to the guide rod, the position-limiting door frame is fixed on the first slot of the lower mold body or the upper mold body, the second slot matches the guide rod, and the tensioning spring is sleeved on the guide rod.

5. The lost foam casting device for casting the motor housing of a three-wheeled heavy-duty motorcycle according to claim 4, characterized in that: The magnetic poles and magnetic force of the electromagnetic ring can be changed by adjusting the direction and magnitude of the current, and the tension spring has an elastic force that drives the lower mold shell and the upper mold shell to move closer together.

6. The lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle according to claim 1, characterized in that: An upper heat dissipation grille is provided on one side of the upper mold shell away from the upper mold groove, and a casting mold tube is provided inside the upper heat dissipation grille. The number of the casting mold tubes is three groups evenly divided at equal angles, and the casting mold tube is connected to the upper mold groove; A lower heat dissipation grille is provided on one side of the lower mold shell away from the upper groove.

7. The lost foam casting device for casting the motor housing of a three-wheeled heavy-duty motorcycle according to claim 6, characterized in that: After surface finishing, the pattern is equipped with three groups of sprue pipes corresponding to the casting mold pipe, and the outer diameter of the sprue pipe is smaller than the inner diameter of the casting mold pipe.

8. The lost foam casting device for casting the motor housing of a three-wheeled heavy-duty motorcycle according to claim 7, characterized in that: The surface of the mold is coated with a refractory coating, the thickness of the male mold shell and the female mold shell are equal to the coating thickness of the refractory coating, and the radius difference between the sprue tube and the casting mold tube is equal to the coating thickness of the refractory coating; The inner cavity after the lower groove and the upper groove are matched with the outer contour of the pattern coated with the refractory coating.

9. The lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle according to claim 1, characterized in that: A sand injection interface and a negative pressure interface are provided on one side of the lower mold body and the upper mold body, and the sand injection interface and the negative pressure interface are respectively communicated with the lower sand trough or the upper sand trough.

10. The lost foam casting device for casting a motor housing of a three-wheeled heavy-duty motorcycle according to claim 1, characterized in that: The inner walls of the lower sand trough, the lower molding trough, the upper sand trough and the upper molding trough are all coated with an anti-stick coating.

Images