A feeding bush and wax tree for a vortex shell investment casting
By setting ribs on the feeding die head and connecting them with rounded corners, the shell mold structure is optimized, solving the problem of low feeding efficiency in traditional investment casting, and achieving efficient feeding and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHAOQING PISITONG MASCH CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-14
AI Technical Summary
In traditional investment casting, the solidification time of the feeding area is close to that of the vortex shell, resulting in generally low feeding efficiency. This necessitates the use of larger feeding molds, which increases steel waste and production costs.
Multiple ribs are set on the shrinkage die head structure and connected by rounded corners to thicken the thick parts of the shell die, prolong the solidification time of the molten metal, and allow the thin parts to dissipate heat quickly, thus optimizing the shell die structure to improve shrinkage efficiency.
By optimizing the structure of the feeding die, the solidification time of molten metal in thick areas is extended, feeding efficiency is improved, steel waste is reduced, and production costs are lowered.
Smart Images
Figure CN224487600U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of casting technology, and more specifically, relates to a shrinkage compensation die and a wax tree for investment casting of vortex shells. Background Technology
[0002] When producing a vortex shell, investment casting can be used. First, a mold is prepared according to the shape of the vortex shell. Wax is injected into the mold to form a vortex shell wax model. At the same time, a shrinkage mold wax model is made. The shrinkage mold wax model and the vortex shell wax model are welded together to form a wax tree. Coating and sand are applied layer by layer to the surface of the wax tree to form a shell. The wax tree is melted by steam to form a shell mold. Molten metal is poured into the shell. After cooling, the shell is removed and the mold head is cut off to obtain the vortex shell.
[0003] The cavity formed after the volute wax mold melts can be used to cast the volute; the cavity formed after the shrinkage mold head melts is the shrinkage area, used for casting, which includes runners and risers.
[0004] In traditional investment casting, the thickness of the shell mold is relatively uniform in all areas. Therefore, the solidification time of the feeding area is similar to that of the vortex shell, resulting in a generally low feeding efficiency. In order to ensure that the casting is fully fed during solidification, a large-sized feeding die head is often required. This not only leads to waste of molten steel but also increases production costs. Utility Model Content
[0005] The main purpose of this utility model is to provide a feeding mold head and wax tree for vortex shell investment casting, which aims to increase the ribs so that the shell mold is thicker at the rib positions during subsequent forming of the shell mold. After the molten steel is poured, the thick shell mold plays a long-term heat preservation role due to the long heat dissipation time, thereby improving the feeding efficiency.
[0006] According to a first aspect of the present invention, a shrinkage compensation die head for investment casting of vortex shell is provided, comprising a body, wherein the body is provided with a first flow channel portion and a second flow channel portion, the first flow channel portion being used to generate the main flow channel and the second flow channel portion being used to generate the distal flow channel.
[0007] Both the main body and the second flow channel are provided with multiple outwardly protruding ribs, and the ribs are connected to the main body and the second flow channel by rounded corners.
[0008] In the aforementioned vortex shell investment casting die head, the main body is provided with a third flow channel section for generating secondary flow channels.
[0009] In the aforementioned vortex shell investment casting die head, both the first flow channel and the third flow channel are located at the bottom of the main body.
[0010] In the aforementioned vortex shell investment casting die head, the main body is provided with multiple ribs, which are arranged at intervals from top to bottom.
[0011] In the aforementioned vortex shell investment casting die head, the second flow channel is provided with multiple ribs, and the ribs on the second flow channel intersect each other.
[0012] In the aforementioned vortex shell investment casting die head, the main body is provided with a fourth flow channel for generating an exhaust channel.
[0013] In the aforementioned vortex shell investment casting die head, both the second flow channel and the fourth flow channel are connected to the lower part of the main body.
[0014] According to a second aspect of the present invention, a wax tree for investment casting of a vortex shell is provided, comprising a shrinkage compensation die head and a vortex shell wax model. The shrinkage compensation die head is as described in the first aspect. The vortex shell wax model is adapted to the shape of the vortex shell. A first flow channel portion is connected to the vortex shell wax model at a position corresponding to the vortex shell vortex chamber. A second flow channel portion is connected to the vortex shell wax model at a position corresponding to the vortex shell diffuser tube.
[0015] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:
[0016] In this invention, the structure of the feeding mold head has been optimized by setting ribs on its outer wall. Subsequently, the shell mold is prepared by coating and sanding layers using the feeding mold head. During the shell making process, due to the presence of multiple ribs and the rounded corners at the bottom of the ribs, the shell mold thickness at the ribs is thicker than that at other locations. Therefore, after the molten metal is poured, the part corresponding to the feeding mold head has a longer heat preservation time due to the thick shell mold, which delays the solidification time of the molten metal. On the other hand, the part corresponding to the vortex shell has a thinner shell mold, which can dissipate heat quickly and will solidify first. Therefore, by optimizing the structure of the feeding mold head, the feeding efficiency has been improved. Attached Figure Description
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;
[0019] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention;
[0020] Figure 3 This is a cross-sectional view of the shell mold manufactured according to Embodiment 2 of this utility model;
[0021] Figure 4 This is a schematic diagram of the vortex shell structure of this utility model;
[0022] Figure 5 This is a structural schematic diagram of Comparative Example 1 of this utility model;
[0023] Figure 6 This is a cross-sectional view of the shell mold made according to Comparative Example 1 of this utility model.
[0024] The figure labels for each figure are as follows:
[0025] 1. Main body; 11. First flow channel section; 12. Second flow channel section; 13. Third flow channel section; 14. Fourth flow channel section; 2. Rib; 3. Vortex shell wax model; 100. Vortex chamber; 101. Diffuser tube. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of the 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 this utility model, and should not be construed as limiting this utility model.
[0027] The following disclosure provides many different implementation methods or examples for different solutions to implement this utility model.
[0028] Reference Figure 4 The vortex shell involved in this application includes a vortex chamber 100 and a diffuser tube 101.
[0029] Example 1
[0030] Reference Figure 1 As shown, a shrinkage die head for investment casting of vortex shell includes a main body 1. The main body 1 is provided with a first flow channel 11, a second flow channel 12, a third flow channel 13 and a fourth flow channel 14. The first flow channel 11 is used to generate the main flow channel, the second flow channel 12 is used to generate the distal flow channel, the third flow channel 13 is used to generate the secondary flow channel, and the fourth flow channel 14 is used to generate the venting channel.
[0031] The first flow channel section 11 and the third flow channel section 13 are both located at the bottom of the main body 1, and the second flow channel section 12 and the fourth flow channel section 14 are both connected to the lower part of the main body 1.
[0032] Both the main body 1 and the second flow channel 12 are provided with multiple outwardly protruding ribs 2, and the ribs 2 and the main body 1, and the ribs 2 and the second flow channel 12 are connected by rounded corners.
[0033] The structure of the feeding die head was optimized by adding ribs 2 to its outer wall. Subsequently, the shell mold was prepared by applying coating and sand layer by layer using the feeding die head. During the shell making process, due to the presence of multiple ribs 2 and the rounded corners at the bottom of the ribs 2, the shell mold at the ribs 2 is thicker than that at other locations. Therefore, after the molten metal is poured, the part corresponding to the feeding die head has a longer heat preservation time due to the thick shell mold, which delays the solidification time of the molten metal. On the other hand, the part corresponding to the vortex shell has a thinner shell mold, which can dissipate heat quickly and will solidify first. Therefore, by optimizing the structure of the feeding die head, the feeding efficiency has been improved.
[0034] After the shell mold is prepared and the shrinkage die head is melted away, the cavity formed by the main body 1 is mainly used to hold the molten metal. The cavity formed by the first flow channel 11 is the main flow channel, which mainly injects molten metal into the volute of the volute shell. The cavity formed by the second flow channel 12 is the distal flow channel, which mainly injects molten metal into the end of the diffuser of the volute shell. Since the injection distance is long, the temperature of the distal flow channel needs to be paid more attention to. This is why it is necessary to set the rib 2 in the second flow channel 12 to increase the thickness of the shell mold at the distal flow channel position and delay the solidification of the molten metal in the distal flow channel. The cavity formed by the third flow channel 13 is the secondary flow channel, which also injects molten metal into the volute of the volute shell. The main flow channel and the secondary flow channel work together to cast the volute part of the volute shell. The cavity formed by the fourth flow channel 14 is the exhaust channel, which allows the gas of the volute shell product to be discharged in time during the injection of molten metal.
[0035] In this embodiment, the main body 1 is provided with a plurality of protruding ribs 2, which are arranged at intervals from top to bottom, so as to make the shell mold thicker at the position corresponding to the main body 1.
[0036] In this embodiment, the second flow channel 12 is provided with a plurality of protruding ribs 2, and the protruding ribs 2 on the second flow channel 12 intersect each other.
[0037] Example 2
[0038] Reference Figures 2 to 3 As shown, a wax tree for investment casting of a vortex shell includes a shrinkage mold head and a vortex shell wax model 3. The shrinkage mold head is as described in Example 1. The vortex shell wax model 3 is adapted to the shape of the vortex shell. The first flow channel 11 is connected to the position of the vortex shell wax model 3 corresponding to the position of the vortex shell vortex chamber. The second flow channel 12 is connected to the position of the vortex shell wax model 3 corresponding to the end position of the vortex shell diffuser tube. The third flow channel 13 is connected to the position of the vortex shell wax model 3 corresponding to the position of the vortex shell vortex chamber. The fourth flow channel 14 is connected to the position of the vortex shell wax model 3 corresponding to the middle position of the vortex shell diffuser tube.
[0039] Based on the wax model, a shell model is made. Then, the shrinkage compensation mold head and the volute wax model 3 are melted to obtain the shrinkage compensation area and the volute forming area. Molten metal is poured through the shrinkage compensation area. The molten metal can enter the volute forming area through the main flow channel, secondary flow channel and far-end flow channel. The gas in the volute forming area can be quickly discharged through the exhaust channel during the molten metal injection process.
[0040] Comparative Example 1
[0041] Reference Figures 5 to 6 As shown, it is largely the same as in Example 2, except that no ribs are provided on the shrinkage die head.
[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A shrinkage compensation die head for investment casting of vortex shells, characterized in that, The system includes a main body, on which a first flow channel section and a second flow channel section are provided. The first flow channel section is used to generate the main flow channel, and the second flow channel section is used to generate the distal flow channel. Both the main body and the second flow channel are provided with multiple outwardly protruding ribs, and the ribs are connected to the main body and the second flow channel by rounded corners.
2. The shrinkage compensation die head for investment casting of vortex shells according to claim 1, characterized in that, The main body is provided with a third flow channel section for generating secondary flow channels.
3. The shrinkage compensation die head for investment casting of vortex shells according to claim 2, characterized in that, Both the first flow channel and the third flow channel are located at the bottom of the main body.
4. The shrinkage compensation die head for investment casting of vortex shells according to claim 1, characterized in that, The main body is provided with multiple protruding ribs, which are arranged at intervals from top to bottom.
5. The shrinkage compensation die head for investment casting of vortex shells according to claim 1, characterized in that, The second flow channel is provided with multiple ribs, and the ribs on the second flow channel intersect each other.
6. The shrinkage compensation die head for investment casting of vortex shells according to claim 1, characterized in that, The main body is provided with a fourth flow channel for generating exhaust channels.
7. The shrinkage compensation die head for investment casting of vortex shells according to claim 6, characterized in that, Both the second flow channel and the fourth flow channel are connected to the lower part of the main body.
8. A wax tree for investment casting of a vortex shell, comprising a shrinkage compensation die head and a vortex shell wax model, characterized in that, The shrinkage mold head is as described in any one of claims 1-7, wherein the volute wax model is adapted to the shape of the volute, the first flow channel portion is connected to the position of the volute wax model corresponding to the volute chamber, and the second flow channel portion is connected to the position of the volute wax model corresponding to the volute diffuser tube.