Method for reducing weight of wax mould of pouring system for investment casting of large complex casting
By setting wax discharge ports and air inlets in the wax mold in the casting system, the wax mold with an internal cavity is solved, and the wax mold with large weight and cracks during splicing in investment casting of large and complex castings is achieved, and the effect of weight reduction and splicing stability is achieved.
Patent Information
- Application Number
- CN202510210941.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-05-23
AI Technical Summary
During the investment casting process of large and complex castings, the wax mold in the solid casting system is relatively large, resulting in crack problems easily occur when splicing with the wax mold in the casting.
By using the casting system wax mold mold, the upper and lower symmetric wax outlets and air inlets are installed, the wax liquid is injected and a solidified layer is formed. Then the mold is turned over and the wax outlets and air inlets are opened, the solidified layer is removed and the uncured wax liquid is discharged to form a wax mold with an internal cavity.
The weight of the wax mold in the casting system is effectively reduced, from the original 4KG to 2.5Kg, and the weight is reduced by 62.5%. At the same time, the crack problem during the splicing of the wax mold and the casting wax mold is solved.
Smart Images
Figure CN120023294A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a method for reducing the weight of a wax mold of a pouring system for investment casting of a large and complex casting, and belongs to the technical field of investment casting. Background Art
[0002] When large and complex castings are cast, shrinkage is mainly fed by the riser under the action of gravity. In order to ensure that the internal quality of the casting meets the requirements and does not have defects such as looseness and shrinkage holes caused by insufficient shrinkage, the shrinkage feed riser is usually larger, which makes it easier to make a solid wax mold of the gating system (such as Figure 1 The weight of the wax mold is relatively large, and when the solid pouring system wax mold is spliced with the casting wax mold, cracks are easily pressed out at the bonding position with the casting wax mold. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a method for reducing the weight of a wax mold of a pouring system for investment casting of large and complex castings.
[0004] The present invention is achieved through the following technical solutions.
[0005] The invention provides a method for reducing the weight of a gating system wax mold for investment casting of a large complex casting, comprising: using a gating system wax mold mold to produce a gating system wax mold with a cavity inside.
[0006] The method comprises the step 1 of installing a wax mold of a casting system with a wax discharge port and an air inlet symmetrically arranged up and down.
[0007] The step also includes the second step of injecting wax liquid into the molding space between the upper mold body and the lower mold body to complete the filling; after the filling is completed, it is maintained for 1min to 3min, and the wax forms a solidified layer with a thickness of about 10mm inside the wax mold of the casting system.
[0008] It also includes step three, turning the casting system wax mold 90 degrees, opening the wax discharge port and the air inlet at the same time, using tools to remove the solidified layer of the wax mold at the corresponding positions of the wax discharge port and the air inlet at the bottom, and the air inlet at the top is connected to the atmosphere for gas replenishment to discharge the molten and unsolidified wax liquid inside the casting system wax mold.
[0009] It also includes step 4, after the wax liquid is discharged, the upper mold body and the lower mold body are opened, and the casting system wax mold with a cavity formed inside is taken out for subsequent cooling. After the cooling is completed, the wax discharge port and the air inlet are sealed with repair wax.
[0010] The pouring system wax mold comprises an upper mold body and a lower mold body. A wax discharge port and an air inlet are symmetrically arranged on the lower mold body. The upper mold body and the lower mold body are in close contact and fit and can be detached.
[0011] The upper mold body and the lower mold body are provided with grooves to form a molding space for molding the wax mold of the pouring system; the molding space is communicated with the wax discharge port and the air inlet.
[0012] The wax discharge port and the air inlet are both through holes with a diameter of 10 mm.
[0013] The beneficial effects of the present invention are: a pouring system wax mold with a wax discharge port and an air inlet is used to produce a pouring system wax mold with a cavity formed inside, so that the weight of the pouring system wax mold is reduced from the original weight of 4KG to 2.5Kg, and the weight is reduced by 62.5%. When the pouring system wax mold is spliced with the casting wax mold, the problem of cracks being pressed out at the bonding portion between the solid pouring system wax mold and the casting wax mold is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional schematic diagram of an existing solid casting system wax mold;
[0015] Figure 2 It is a cross-sectional schematic diagram of a wax mold of a gating system of the present invention placed vertically;
[0016] Figure 3 It is a cross-sectional schematic diagram of a wax mold of a gating system of the present invention, which is placed flat and filled with wax liquid;
[0017] Figure 4 It is a cross-sectional schematic diagram of the wax liquid being discharged when the wax pattern mold of the pouring system of the present invention opens the wax discharge port and the air inlet;
[0018] Figure 5 It is a cross-sectional schematic diagram of a hollow casting system wax mold made by the present invention;
[0019] In the figure: 1-wax mold of the pouring system; 11-upper mold body; 12-lower mold body; 13-wax discharge port; 14-air inlet; 2-wax mold of the pouring system; 21-cavity. DETAILED DESCRIPTION
[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.
[0021] like Figures 2 to 5 shown.
[0022] A method for reducing the weight of a wax mold of a gating system for investment casting of a large complex casting of the present invention comprises the following steps:
[0023] Step 1: A wax discharge port 13 and an air inlet 14 are symmetrically arranged on the wax mold 1 of the pouring system. Figure 2 As shown; the wax discharge port 13 and the air inlet 14 are both through holes with a diameter of 10 mm.
[0024] Step 2: inject wax liquid into the molding space between the upper mold body 11 and the lower mold body 12 to complete the filling. Figure 3 As shown; after the filling is completed, it is maintained for 1min to 3min. Due to the chilling effect of the heat exchange between the casting system wax mold 1 and the outside world, the wax forms a solidified layer with a thickness of about 10mm inside the casting system wax mold 1, ensuring that the strength of the casting system wax mold meets the requirements of the wax mold assembly tree.
[0025] Step 3: Flip the gating system wax mold 1 by 90°. Figure 4 As shown, the wax discharge port 13 and the air inlet 14 are opened at the same time, and tools are used to remove the solidified layer of the wax model at the corresponding positions of the wax discharge port 13 and the air inlet 14 below. During this process, the air inlet 14 is located at the top and connected to the atmosphere for gas replenishment to avoid the formation of negative pressure inside and cause the wax model to collapse, so that the unsolidified wax liquid in the molten state inside the wax model 2 of the casting system can be discharged.
[0026] Step four, after the wax liquid is discharged, the upper mold body 11 and the lower mold body 12 are opened, the casting system wax mold 2 is taken out, and subsequent cooling is performed according to the prescribed cooling method. After cooling is completed, the wax discharge port 13 and the air inlet 14 are sealed with repair wax, and the tree assembly operation can be performed. At this time, a cavity 21 is formed inside the casting system wax mold 2, thereby reducing the weight of the casting system wax mold 2.
[0027] The casting system wax mold mold 1 includes: an upper mold body 11 and a lower mold body 12, a wax discharge port 13 and an air inlet 14 are symmetrically arranged on the lower mold body 12, and the upper mold body 11 and the lower mold body 12 are in close contact and fit and can be detached; the upper mold body 11 and the lower mold body 12 are provided with grooves to form a molding space for molding the casting system wax mold; the molding space is connected with the wax discharge port 13 and the air inlet 14.
[0028] The present application uses a pouring system wax mold 1 provided with a wax discharge port 13 and an air inlet 14 to produce a pouring system wax mold 2 with a cavity 21 formed inside, so that the weight of the pouring system wax mold 2 is reduced from the original weight of 4KG to 2.5Kg, and the weight is reduced by 62.5%. When the pouring system wax mold 2 is spliced with the casting wax mold, the problem of cracks being pressed out at the bonding portion between the solid pouring system wax mold 2 and the casting wax mold is solved.
Claims
1. A method for reducing the weight of wax molds in a gating system for investment casting of large and complex castings, characterized in that: include: A method for producing a casting system wax mold (2) having a cavity (21) inside thereof by using a casting system wax mold mould (1).
2. The method for reducing the weight of wax molds in a gating system for investment casting of large and complex castings according to claim 1, characterized in that: The method comprises the step 1 of installing a wax mold (1) of a casting system having a wax discharge port (13) and an air inlet (14) symmetrically arranged in the upper and lower parts.
3. The method for reducing the weight of wax molds in a pouring system for investment casting of large and complex castings as claimed in claim 2, characterized in that: The process also includes step 2, wherein wax liquid is injected into the molding space between the upper mold body (11) and the lower mold body (12) to complete the molding; after the molding is completed, the wax is maintained for 1 to 3 minutes to form a solidified layer with a thickness of about 10 mm inside the wax mold (1) of the casting system.
4. The method for reducing the weight of wax molds in a pouring system for investment casting of large complex castings as claimed in claim 3, characterized in that: The method also includes step three, in which the casting system wax mold (1) is turned over 90 degrees, and the wax discharge port (13) and the air inlet (14) are opened at the same time, and the solidified layer of the wax mold corresponding to the wax discharge port (13) and the air inlet (14) at the bottom is removed using a tool, and the air inlet (14) is connected to the atmosphere at the top for gas replenishment, so that the unsolidified wax liquid in the molten state inside the casting system wax mold (2) can be discharged.
5. The method for reducing the weight of wax molds in a gating system for investment casting of large and complex castings as claimed in claim 4, characterized in that: The method further comprises step 4, wherein after the wax liquid is discharged, the upper mold body (11) and the lower mold body (12) are opened, and the pouring system wax mold (2) with the cavity (21) formed inside is taken out for subsequent cooling. After the cooling is completed, the wax discharge port (13) and the air inlet (14) are sealed with repair wax.
6. The method for reducing the weight of wax molds in a gating system for investment casting of large complex castings according to any one of claims 1 to 5, characterized in that: The pouring system wax mold (1) comprises an upper mold body (11) and a lower mold body (12); a wax discharge port (13) and an air inlet (14) are symmetrically arranged on the lower mold body (12); the upper mold body (11) and the lower mold body (12) are in close contact and fit and are detachable.
7. The method for reducing the weight of wax molds in a gating system for investment casting of large and complex castings according to claim 6, characterized in that: The upper mold body (11) and the lower mold body (12) are provided with grooves to form a molding space for molding the wax mold of the pouring system; the molding space is connected to the wax discharge port (13) and the air inlet (14).
8. The method for reducing the weight of wax molds in a gating system for investment casting of large complex castings according to claim 6, characterized in that: The wax discharge port (13) and the air inlet (14) are both through holes with a diameter of 10 mm.