A method of casting a motorcycle reference seat

Abstract

The application discloses a casting method of a motorcycle reference seat, and steps include: preparing a cold wax rib structure, preparing a reference seat wax mold, assembling a tree, preparing a shell, dewaxing, shell roasting, alloy smelting and pouring, cooling and shell removing, and cutting and post-processing. The casting method of the motorcycle reference seat adopts a precision investment casting process to replace a traditional sand core casting process, cancels a large machining allowance required by sand casting, and reduces a main visual surface wall thickness of the reference seat to 3 mm. Meanwhile, the cold wax rib combination process is used to realize accurate forming of a complex thin-wall reinforced structure, and the contribution of structure optimization to light weight is fully played. Compared with an existing sand casting product, the product weight is reduced by 15%-25% under the condition of meeting the performance requirements of extreme working conditions.

Description

Technical Field

[0001] This invention relates to the field of motorcycle reference base casting, and more particularly to a casting method for a motorcycle reference base. Background Technology

[0002] As the motorcycle industry moves towards lightweight design, reducing overall vehicle weight has become a key means of improving power, handling, and fuel economy. The reference mount in the frame system, as a core structural component connecting the frame to key components such as the engine and suspension, is of great significance for optimizing its manufacturing process.

[0003] In order to reduce the weight of the motorcycle reference seat, the existing technology has further reduced the wall thickness, resulting in a motorcycle reference seat with a main viewing surface of 3mm. However, when manufacturing this thin-walled carbon steel reference seat using traditional sand core casting or conventional investment casting processes, the following problems exist: (1) The carbon steel liquid has poor fluidity, high melting point, and fast heat loss, making it very easy to produce incomplete pouring or cold shut at the 3mm thin wall; (2) Shrinkage marks are easy to occur at the connection between the wax part surface and the rib, and the carbon steel body has a large shrinkage rate, making it very easy to produce shrinkage defects at the connection between the thin wall and the thick wall; (3) The thermal stress is large during solidification, and hot cracks are easy to occur at hot joints, making it difficult to control deformation during heat treatment of thin-walled parts. Summary of the Invention

[0004] The purpose of this invention is to propose a casting method for a motorcycle reference base, so as to solve the problem that the existing mold casting process cannot manufacture thin-walled carbon steel reference bases.

[0005] To achieve this objective, the present invention adopts the following technical solution: This invention provides a method for casting a motorcycle reference base, comprising the following steps: Preparation of cold wax rib structure: Inject medium-temperature wax material into the cavity of the rib mold, hold pressure and cool, then open the mold and remove the cold wax rib structure; Preparation of the reference base wax model: Place the cold wax rib structure into the wax model mold, close the mold, pour medium-temperature wax into the wax model mold, maintain pressure and cool, then open the mold and take out the reference base wax model; Tree assembly: Trim the base wax model and assemble multiple trimmed base wax models to form a wax model tree with a wax casting system; Shell making: The outer surface of the wax model tree is coated with slurry and reinforced with refractory sand. After drying and hardening, the shell is obtained. Dewaxing: The dried shell is placed in a dewaxing device to recover the medium-temperature wax material, creating a cavity inside the shell; Shell firing: The dewaxed shell is fired; Alloy smelting and casting: The alloy material is melted into molten steel and heated to 150-200°C above the melting point of the alloy material; the baked mold shell is placed in a sand box and the gap between the mold shell and the sand box is filled with dry sand; the molten steel is poured into the pouring cup of the mold shell. Cooling and shell removal: The outer shell is cooled fully in the sand box until the casting solidifies, forming a casting tree; then the outer shell is removed, and the casting tree with the gating system is taken out. Cutting and post-processing: The casting tree is divided to obtain the casting. The casting is then shot-blasted, ground, and heat-treated in sequence to obtain the motorcycle reference seat casting.

[0006] In the casting method of the motorcycle reference seat, in the steps of preparing the cold wax rib structure and preparing the reference seat wax model, the melting temperature range of the medium-temperature wax is 60-85℃; the medium-temperature wax, by mass, includes the following components: 45-50 parts paraffin wax, 10-15 parts microcrystalline wax, 20-30 parts resin and 1-3 parts stearic acid.

[0007] In the casting method of the motorcycle reference seat, in the steps of preparing the cold wax rib structure and preparing the reference seat wax model, the injection temperature of the medium-temperature wax material is 50-55℃, and the injection pressure is 10-15Kg / cm. 2 The injection time is 10-20 seconds.

[0008] In the casting method of the motorcycle reference base, in the shell-making step, the slurry comprises the following components by weight: 30-35 parts silica sol and 65-70 parts zircon powder, wherein the fineness of the zircon powder is 200-300 mesh; the refractory sand is mullite sand, wherein the fineness of the refractory sand is 300-400 mesh.

[0009] In the casting method of the motorcycle reference base, the dewaxing equipment in the dewaxing step is a high-pressure steam dewaxing kettle or a hot water dewaxing tank; the dewaxing temperature is 80-160℃, the dewaxing pressure is 0.2-0.7MPa, and the dewaxing time is 5-15min.

[0010] In the casting method of the motorcycle reference base, in the shell baking step, the baking temperature is 1050~1100℃ and the baking time is ≥1h.

[0011] In the casting method of the motorcycle reference seat, the pouring temperature is 1600-1650℃ during the alloy melting and pouring steps.

[0012] In the casting method of the motorcycle reference base, the wax mold includes a moving mold body, a fixed mold body, a moving mold connecting plate, a fixed mold connecting plate, and a mold movable block; the moving mold connecting plate is disposed at the top of the moving mold body, and the fixed mold connecting plate is disposed at the bottom of the fixed mold body; the fixed mold connecting plate is provided with an ejection mechanism, the movable end of which is inserted into the fixed mold body for ejecting the reference base wax mold; The moving mold body and the fixed mold body are detachably connected to form a wax mold body; the moving mold body is provided with a moving mold cavity, and the fixed mold body is provided with a fixed mold cavity. The moving mold cavity and the fixed mold cavity cooperate to form a casting cavity; the moving mold cavity and the fixed mold cavity are respectively provided with cold wax rib placement grooves; the bottom of the fixed mold cavity is provided with a first gate, a second gate and a third gate at intervals, and the inlets of the first gate, the second gate and the third gate are located on one side of the fixed mold body; The wax mold body has a wax injection port on one side and a movable block insertion port on the other side. The casting cavity is connected to the wax injection port, and the mold movable block can be detachably installed in the movable block insertion port.

[0013] In the casting method of the motorcycle reference base, the heat treatment temperature in the cutting and post-processing steps is 900-960℃.

[0014] One of the technical solutions in this invention can have the following beneficial effects: The casting method for the motorcycle reference base employs investment casting instead of traditional sand casting, eliminating the large machining allowance required for sand casting and reducing the wall thickness of the main viewing surface of the reference base to 3mm. Simultaneously, a cold wax rib assembly process achieves precise molding of the complex thin-walled reinforced structure, fully leveraging the contribution of structural optimization to lightweight design. Compared to existing sand-cast products, the product weight is reduced by 15%–25% while meeting extreme performance requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a wax mold in one embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a wax mold in one embodiment of the present invention; In the attached diagram: 1. Moving mold body; 2. Fixed mold body; 3. Moving mold connecting plate; 4. Fixed mold connecting plate; 5. Mold movable block; 6. Ejection mechanism; 7. Casting cavity; 8. Cold wax rib placement groove; 9. First gate; 10. Second gate; 11. Third gate; 12. Wax injection port. Detailed Implementation

[0016] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0018] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] This invention provides a method for casting a motorcycle reference base, comprising the following steps: Preparation of cold wax rib structure: Inject medium-temperature wax material into the cavity of the rib mold, hold pressure and cool, then open the mold and remove the cold wax rib structure; Preparation of the reference base wax model: Place the cold wax rib structure into the wax model mold, close the mold, pour medium-temperature wax into the wax model mold, maintain pressure and cool, then open the mold and take out the reference base wax model; Tree assembly: Trim the base wax model and assemble multiple trimmed base wax models to form a wax model tree with a wax casting system; Shell making: The outer surface of the wax model tree is coated with slurry and reinforced with refractory sand. After drying and hardening, the shell is obtained. Dewaxing: The dried shell is placed in a dewaxing device to recover the medium-temperature wax material, creating a cavity inside the shell; Shell firing: The dewaxed shell is fired; Alloy smelting and casting: The alloy material is melted into molten steel and heated to 150-200°C above the melting point of the alloy material; the baked mold shell is placed in a sand box and the gap between the mold shell and the sand box is filled with dry sand; the molten steel is poured into the pouring cup of the mold shell. Cooling and shell removal: The outer shell is cooled fully in the sand box until the casting solidifies, forming a casting tree; then the outer shell is removed, and the casting tree with the gating system is taken out. Cutting and post-processing: The casting tree is divided to obtain the casting. The casting is then shot-blasted, ground, and heat-treated in sequence to obtain the motorcycle reference seat casting.

[0021] In the steps of preparing the cold wax rib structure and the reference base wax model, the medium-temperature wax material is first injected separately into the rib mold to prepare the cold wax rib structure. Then, the cold wax rib structure is placed into the wax model mold, the mold is closed, and wax is injected. This allows the cold wax rib structure and the injected medium-temperature wax to melt into one piece and be demolded at the same time, forming a reference base wax model with a rib structure. This avoids the problem of difficult-to-control wax flow at the connection between the rib and the main body wall during overall wax injection, and effectively eliminates defects such as shrinkage marks and bubbles at the rib connection. At the same time, the cold wax rib structure participates in the molding as a pre-placed core during the mold closing and wax injection process, making the wax model structure at the connection between thin and thick walls more uniform, reducing shrinkage defects in this area of ​​the subsequent casting from the source.

[0022] The width and height of the cold wax rib structure are both 2.8–3.3 mm, and the cross-section of the cold wax rib structure is V-shaped. The rib structure acts as a reinforcing rib, providing additional stiffness and strength in critical stress areas, allowing the thin-walled part to meet the mechanical performance requirements under extreme conditions while reducing weight, and preventing deformation or breakage of the reference wax model. The V-shaped cross-section uses less material and is lighter while maintaining the same height and root strength, further reducing the overall weight of the reference base while achieving a thin-walled reinforced structure.

[0023] In the tree-building step, the reference base wax model is trimmed to remove parting lines and flash, ensuring a smooth surface. Subsequently, multiple trimmed reference base wax models are welded onto the wax casting system to form a wax model tree; the wax casting system includes a pouring cup, sprue, runner, and ingate. Assembling multiple trimmed reference base wax models together allows for the simultaneous casting of multiple motorcycle reference bases, improving production efficiency.

[0024] In the shell-making process, the wax model tree is first immersed in a slurry made of silica sol and zircon powder, so that its surface is evenly covered with a layer of slurry. Before the coating dries, a layer of mullite sand is immediately mixed on to increase the shell thickness and breathability. Then, the wax model tree mixed with sand is placed in a constant temperature and humidity environment to allow the silica sol to fully gel and solidify.

[0025] In the dewaxing step, the mold shell is placed in a high-pressure steam dewaxing kettle or a hot water dewaxing tank. Hot water or steam is used to melt and drain the wax, which is then recovered, creating a cavity inside the mold shell for casting.

[0026] In the shell baking step, the shell is sent into a high-temperature baking furnace for baking.

[0027] In the alloy smelting and casting process, the alloy material is selected according to the performance requirements of the motorcycle reference seat, such as strength and toughness requirements, using the corresponding carbon steel grade. Furthermore, the molten steel needs to undergo pre-furnace chemical composition analysis to ensure its quality. Before casting, the red-hot mold shell is removed from the furnace and placed in a sand box, surrounded by dry sand for support; then, the molten steel from the ladle is poured smoothly, quickly, and continuously into the mold shell's pouring cup.

[0028] The casting shell is allowed to cool fully in the sand box after pouring through a cooling and shell removal process until the casting solidifies and cools to a lower temperature. The outer shell is then broken and removed using a vibratory shell remover or by manual tapping, exposing the casting tree containing the gating system.

[0029] In the cutting and post-processing steps, individual castings are cut from the gating system using an abrasive wheel cutter or hydraulic cutter. Subsequently, high-speed steel shot is blasted onto the casting surface using a shot blasting machine to thoroughly remove residual shell material and oxide scale, and to strengthen the surface. The marks and burrs from the cut gate are then ground away to achieve the desired appearance. Finally, normalizing or annealing is performed to eliminate internal stresses generated during the casting process.

[0030] The casting method for the motorcycle reference base employs investment casting instead of traditional sand casting, eliminating the large machining allowance required for sand casting and reducing the wall thickness of the main viewing surface of the reference base to 3mm. Simultaneously, a cold wax rib assembly process achieves precise molding of the complex thin-walled reinforced structure, fully leveraging the contribution of structural optimization to lightweight design. Compared to existing sand-cast products, the product weight is reduced by 15%–25% while meeting extreme performance requirements.

[0031] Specifically, in the steps of preparing the cold wax rib structure and preparing the reference base wax mold, the melting temperature range of the medium-temperature wax is 60-85℃; the medium-temperature wax, by mass, includes the following components: 45-50 parts paraffin wax, 10-15 parts microcrystalline wax, 20-30 parts resin and 1-3 parts stearic acid.

[0032] By using the above components and introducing resin, the room temperature strength and hardness of the medium-temperature wax are significantly higher than those of the low-temperature wax, and the wax mold has sufficient strength and is not easily deformed.

[0033] Specifically, in the steps of preparing the cold wax rib structure and preparing the reference base wax mold, the injection temperature of the medium-temperature wax material is 50-55℃, and the injection pressure is 10-15 kg / cm². 2 The injection time is 10-20 seconds.

[0034] By controlling the injection temperature, injection pressure, and wax injection time as described above, the cavity can be fully filled, thus solving the problems of easy deformation and difficult filling of the motorcycle reference seat due to its thin walls.

[0035] Specifically, in the shell-making step, the slurry comprises the following components by weight: 30-35 parts silica sol and 65-70 parts zircon powder, wherein the fineness of the zircon powder is 200-300 mesh; the refractory sand is mullite sand, wherein the fineness of the refractory sand is 300-400 mesh.

[0036] Silica sol is used as a binder, while zircon powder is a refractory material. Zircon powder has high refractoriness and a low coefficient of thermal expansion, while silica sol has high bonding strength and is environmentally friendly. The surface slurry is prepared using silica sol and zircon powder; their combination results in a dense and smooth shell surface, effectively improving the surface finish of the casting. While the coating is still wet, a layer of mullite sand is immediately mixed in. Because mullite sand is finer than zircon powder, it increases the shell thickness and permeability.

[0037] Specifically, the dewaxing equipment in the dewaxing step is a high-pressure steam dewaxing kettle or a hot water dewaxing tank; the dewaxing temperature is 80-160℃, the dewaxing pressure is 0.2-0.7MPa, and the dewaxing time is 5-15min.

[0038] Specifically, in the shell firing step, the firing temperature is 1050-1100℃ and the firing time is ≥1h.

[0039] The shell firing process removes residual wax and moisture from the shell, improving its strength and permeability. Furthermore, heating the shell to a red-hot state prepares it for subsequent hot casting, preventing splashing of molten steel upon contact with the shell and ensuring its fluidity, allowing it to fill thin-walled sections.

[0040] Specifically, in the alloy melting and casting steps, the casting temperature is 1600–1650°C.

[0041] By using the above-mentioned pouring temperature, it is ensured that the molten steel can fill the entire cavity, avoiding cold shuts or insufficient pouring.

[0042] Please refer to Figure 1 and Figure 2The wax mold includes a moving mold body 1, a fixed mold body 2, a moving mold connecting plate 3, a fixed mold connecting plate 4, and a mold movable block 5; the moving mold connecting plate 3 is disposed at the top of the moving mold body 1, and the fixed mold connecting plate 4 is disposed at the bottom of the fixed mold body 2; the fixed mold connecting plate 4 is provided with an ejection mechanism 6, the movable end of which is inserted into the fixed mold body 2 for ejecting the reference seat wax mold; The moving mold body 1 and the fixed mold body 2 are detachably connected to form a wax mold body; the moving mold body 1 is provided with a moving mold cavity, and the fixed mold body 2 is provided with a fixed mold cavity. The moving mold cavity and the fixed mold cavity cooperate to form a casting cavity 7; the moving mold cavity and the fixed mold cavity are respectively provided with cold wax rib placement grooves 8; the bottom of the fixed mold cavity is provided with a first gate 9, a second gate 10 and a third gate 11 at intervals, and the entrances of the first gate 9, the second gate 10 and the third gate 11 are located on one side of the fixed mold body 2; The wax mold body has a wax injection port 12 on one side and a movable block insertion port on the other side. The casting cavity 7 is connected to the wax injection port 12, and the mold movable block 5 can be detachably installed in the movable block insertion port.

[0043] The moving mold cavity and the fixed mold cavity are respectively provided with cold wax rib placement grooves 8. When the mold is closed, the two side placement grooves cooperate to form a positioning space for the cold wax ribs, realizing precise positioning of the rib structure. This ensures that the position of the cold wax rib structure is fixed and does not shift during the mold closing and wax injection process, and guarantees the relative positional accuracy of the cold wax rib structure and the main body wall, avoiding the wax mold dimensional deviation or uneven wall thickness caused by the displacement of the cold wax rib structure.

[0044] The fixed mold connecting plate 4 is equipped with an ejection mechanism 6, the movable end of which is inserted into the fixed mold body 2. After mold opening, the reference base wax model is smoothly ejected by the ejection mechanism 6. The reference base wax model is relatively thin, and if manual demolding or hammering is used, it is very easy to cause deformation and breakage of the thin-walled parts. The ejection mechanism 6 provides uniform and controllable demolding force, ensuring the smooth surface and dimensional accuracy of the wax model, and reducing demolding defects.

[0045] The bottom of the fixed mold cavity is provided with a first gate 9, a second gate 10, and a third gate 11, all spaced apart. The inlets of the three gates are all located on one side of the fixed mold body. With the above structure, the medium-temperature wax material enters the casting cavity 7 from multiple directions simultaneously, shortening the wax material flow distance, reducing flow resistance, and enabling the wax material to fill the mold evenly. This avoids cold weld marks caused by insufficient filling at the far end or excessive temperature drop due to excessive flow at a single gate.

[0046] The base plate has a complex structure and cannot be easily formed by the direct parting surface of the moving mold and the fixed mold. The mold movable block 5, as a detachable insert, is inserted into the movable block socket before wax injection to participate in the cavity forming. Before mold opening, the mold movable block 5 is first removed, and then the moving mold body 1 and the fixed mold body 2 are separated, thereby achieving demolding of the complex structure without damaging the wax model.

[0047] Specifically, in the cutting and post-processing steps, the heat treatment temperature is 900–960°C.

[0048] By using the heat treatment temperatures described above, the microstructure can be homogenized and the grains in the motorcycle reference base can be refined, thereby enabling the motorcycle reference base to achieve the mechanical properties required by the design.

[0049] Example 1 A method for casting a motorcycle reference base includes the following steps: Preparation of cold wax rib structure: Inject medium-temperature wax material into the cavity of the rib mold, hold pressure and cool, then open the mold and remove the cold wax rib structure; Preparation of the reference base wax model: Place the cold wax rib structure into the wax model mold, close the mold, pour medium-temperature wax into the wax model mold, maintain pressure and cool, then open the mold and take out the reference base wax model; In the steps of preparing the cold wax rib structure and preparing the reference wax mold, the melting temperature range of the medium-temperature wax is 60°C; the medium-temperature wax, by weight, comprises the following components: 45 parts paraffin wax, 12 parts microcrystalline wax, 20 parts resin, and 3 parts stearic acid; the injection temperature of the medium-temperature wax is 50°C, and the injection pressure is 10 kg / cm². 2 The injection time is 10 seconds; Tree assembly: Trim the base wax model and assemble multiple trimmed base wax models to form a wax model tree with a wax casting system; Shell making: A slurry is coated on the outer surface of the wax model tree and reinforced with refractory sand. After drying and hardening, the shell is obtained; 30 parts silica sol and 70 parts zircon powder, wherein the fineness of the zircon powder is 200 mesh; the refractory sand is mullite sand, wherein the fineness of the refractory sand is 300 mesh.

[0050] Dewaxing: The dried shell is placed in a high-pressure steam dewaxing kettle. The dewaxing temperature is 80℃, the dewaxing pressure is 0.7MPa, and the dewaxing time is 15min. The medium-temperature wax material is recovered, which makes the cavity inside the shell form. Shell firing: The dewaxed shell is fired at a temperature of 1050℃ for 1 hour. Alloy smelting and casting: The alloy material is melted into molten steel and heated to 150°C above the melting point of the alloy material; the baked mold shell is placed in the sand box and the gap between the mold shell and the sand box is filled with dry sand; the molten steel is poured into the pouring cup of the mold shell; the casting temperature is 1600°C. Cooling and shell removal: The outer shell is cooled fully in the sand box until the casting solidifies, forming a casting tree; then the outer shell is removed, and the casting tree with the gating system is taken out. Cutting and post-processing: The casting tree is split to obtain the casting. The casting is then shot blasted, polished and heat-treated in sequence. The heat treatment temperature is 900℃ to obtain the motorcycle reference seat casting.

[0051] Example 2 The steps in Example 2 are basically the same as those in Example 1, except that the melting temperature range of the medium-temperature wax is 85°C; the medium-temperature wax, by weight, comprises the following components: 50 parts paraffin wax, 15 parts microcrystalline wax, 30 parts resin, and 1 part stearic acid; the injection temperature of the medium-temperature wax is 55°C, and the injection pressure is 15 kg / cm². 2 The injection time is 20 seconds; the slurry, by weight, comprises the following components: 35 parts silica sol and 65 parts zircon powder, wherein the fineness of the zircon powder is 300 mesh; the fineness of the refractory sand is 400 mesh; the dewaxing equipment is a hot water dewaxing tank; the dewaxing temperature is 160℃, the dewaxing pressure is 0.2MPa, and the dewaxing time is 5 minutes; in the alloy smelting and casting steps, the alloy material is melted into molten steel and heated to 200℃ above the melting point of the alloy material; the calcination temperature is 1100℃, and the calcination time is 1.5 hours; the casting temperature is 1650℃, and the heat treatment temperature is 960℃.

[0052] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for casting a motorcycle reference base, characterized in that, Includes the following steps: Preparation of cold wax rib structure: Inject medium-temperature wax material into the cavity of the rib mold, hold pressure and cool, then open the mold and remove the cold wax rib structure; Preparation of the reference base wax model: Place the cold wax rib structure into the wax model mold, close the mold, pour medium-temperature wax into the wax model mold, maintain pressure and cool, then open the mold and take out the reference base wax model; Tree assembly: Trim the base wax model and assemble multiple trimmed base wax models to form a wax model tree with a wax casting system; Shell making: The outer surface of the wax model tree is coated with slurry and reinforced with refractory sand. After drying and hardening, the shell is obtained. Dewaxing: The dried shell is placed in a dewaxing device to recover the medium-temperature wax material, creating a cavity inside the shell; Shell firing: The dewaxed shell is fired; Alloy smelting and casting: The alloy material is melted into molten steel and heated to 150-200°C above the melting point of the alloy material; the baked mold shell is placed in a sand box and the gap between the mold shell and the sand box is filled with dry sand; the molten steel is poured into the pouring cup of the mold shell. Cooling and shell removal: The mold shell after pouring is cooled fully in the sand box until the casting solidifies, forming a casting tree; Next, remove the outer shell and take out the casting tree with the gating system; Cutting and post-processing: The casting tree is divided to obtain the casting. The casting is then shot-blasted, ground, and heat-treated in sequence to obtain the motorcycle reference seat casting.

2. The casting method for a motorcycle reference seat according to claim 1, characterized in that, In the steps of preparing the cold wax rib structure and preparing the reference base wax mold, the melting temperature range of the medium-temperature wax is 60-85℃; the medium-temperature wax, by mass, includes the following components: 45-50 parts paraffin wax, 10-15 parts microcrystalline wax, 20-30 parts resin and 1-3 parts stearic acid.

3. The casting method for a motorcycle reference seat according to claim 1, characterized in that, In the steps of preparing the cold wax rib structure and preparing the reference base wax mold, the injection temperature of the medium-temperature wax is 50-55℃, and the injection pressure is 10-15 kg / cm². 2 The injection time is 10-20 seconds.

4. The casting method for a motorcycle reference base according to claim 1, characterized in that, In the shell-making step, the slurry comprises the following components by weight: 30-35 parts silica sol and 65-70 parts zircon powder, wherein the fineness of the zircon powder is 200-300 mesh; the refractory sand is mullite sand, wherein the fineness of the refractory sand is 300-400 mesh.

5. The casting method for a motorcycle reference seat according to claim 1, characterized in that, The dewaxing equipment in the dewaxing step is a high-pressure steam dewaxing kettle or a hot water dewaxing tank; the dewaxing temperature is 80-160℃, the dewaxing pressure is 0.2-0.7MPa, and the dewaxing time is 5-15min.

6. The casting method for a motorcycle reference seat according to claim 1, characterized in that, In the shell firing step, the firing temperature is 1050-1100℃ and the firing time is ≥1h.

7. The casting method for a motorcycle reference base according to claim 1, characterized in that, In the alloy melting and casting steps, the casting temperature is 1600-1650℃.

8. The casting method for a motorcycle reference seat according to claim 1, characterized in that, The wax mold includes a moving mold body, a fixed mold body, a moving mold connecting plate, a fixed mold connecting plate, and a mold movable block; the moving mold connecting plate is disposed at the top of the moving mold body, and the fixed mold connecting plate is disposed at the bottom of the fixed mold body; the fixed mold connecting plate is provided with an ejection mechanism, the movable end of which is inserted into the fixed mold body for ejecting the reference seat wax mold; The moving mold body and the fixed mold body are detachably connected to form a wax mold body; the moving mold body is provided with a moving mold cavity, and the fixed mold body is provided with a fixed mold cavity. The moving mold cavity and the fixed mold cavity cooperate to form a casting cavity; the moving mold cavity and the fixed mold cavity are respectively provided with cold wax rib placement grooves; the bottom of the fixed mold cavity is provided with a first gate, a second gate and a third gate at intervals, and the inlets of the first gate, the second gate and the third gate are located on one side of the fixed mold body; The wax mold body has a wax injection port on one side and a movable block insertion port on the other side. The casting cavity is connected to the wax injection port, and the mold movable block can be detachably installed in the movable block insertion port.

9. The casting method for a motorcycle reference base according to claim 1, characterized in that, In the cutting and post-processing steps, the heat treatment temperature is 900-960℃.

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