Foundry mould for setting a heat-producing riser sleeve in a vertical line
By designing a symmetrical casting model and setting a heating riser and a sand-pressing groove on top of the cold riser, the problem of unstable placement of the heating riser sleeve on the vertical line was solved, the casting feeding effect was improved, and the production cost was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG LIANCHENG PRECISION MFG CO LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies make it difficult to effectively apply heat-generating riser sleeves on vertical casting lines, resulting in poor feeding effects and increased production costs or temperature losses.
Design a symmetrical casting model, including a hot riser section, a pouring cup section, a casting cavity section, and a cold riser section. By setting a hot riser section at the top of the cold riser section and opening a sand-pressing groove on the side wall, the hot riser sleeve is fixed by interference fit to ensure its stable placement on the vertical line.
This method achieves stable placement of the heat-generating riser sleeve on a vertical line, improves the casting feeding effect, reduces temperature loss, and lowers production costs.
Smart Images
Figure CN224525927U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting model technology, and in particular to a casting model for placing a heating riser sleeve on a vertical line. Background Technology
[0002] Ductile iron undergoes three stages during solidification: liquid shrinkage, graphite expansion, and solid shrinkage. In traditional process design, the riser must be designed to fully compensate for the shrinkage during the liquid shrinkage stage in order to avoid shrinkage defects inside the casting.
[0003] In the case of cold risers, molten iron typically flows through the casting cavity first and then enters the cold riser. The molten iron experiences significant temperature loss during this flow. If the cold riser modulus is small, its temperature is easily lower than the temperature of the molten iron inside the casting, which is generally above 1300℃, resulting in poor feeding performance. Conversely, increasing the cold riser modulus increases production costs.
[0004] In recent years, hot riser sleeves have begun to be used on cold risers in casting horizontal lines to prolong solidification time and solve the problem of poor feeding effect. However, due to the differences in casting process and casting mold, hot riser sleeves are difficult to apply directly to casting vertical lines. Utility Model Content
[0005] This application provides a casting model for placing a heating riser sleeve on a vertical line, which allows the heating riser sleeve to be directly applied to the casting vertical line mold, thereby solving the problem of poor feeding effect in casting vertical lines, which is common in the industry.
[0006] This application provides a casting model for placing a heating riser sleeve on a vertical line, including a model body for forming a casting cavity. The model body has a symmetrical design, including a heating riser part located in the middle and a pouring cup part located at the top of the heating riser part. Casting cavity parts are symmetrically arranged on both sides of the heating riser part, and a cold riser part is arranged on the outer side of the casting cavity part. A heating riser part is arranged at the top of the cold riser part for placing the heating riser sleeve. The side wall of the heating riser part is provided with a sand pressing groove.
[0007] In one possible implementation, the sprue cup is in the shape of an inverted cone, and a filter section is connected to the bottom of the sprue cup for placing a filter plate. The filter section is connected to the hot riser section through a cone section that is larger at the top and smaller at the bottom. The outer diameter of the filter section is larger than both the outer diameter of the bottom of the sprue cup and the maximum outer diameter of the cone section.
[0008] In one possible implementation, the filter is a silicon carbide foam ceramic filter, the filter is honeycomb-shaped, and the pore size of the filter is 10 PPi.
[0009] In one possible implementation, the module of the hot riser is 1.1 to 1.3 times the module of the casting cavity.
[0010] In one possible implementation, both the heating riser and the cold riser are cylindrical. The center of the heating riser is offset outward by a predetermined distance relative to the center of the cold riser. The predetermined distance is greater than the depth of the sand pressing groove. The sand pressing groove is simultaneously opened on the front top and the front or rear top and rear sides of the heating riser, where the front or rear side refers to one side of the plane where the model body is located in the vertical direction.
[0011] In one possible implementation, the predetermined distance is 4mm-5mm, and the depth of the sand pressing groove is 0.2mm-0.3mm.
[0012] In one possible implementation, the width of the top sand-pressing groove is 5mm-8mm, and the width of the outer sand-pressing groove is 14mm-15mm.
[0013] Beneficial effects: Compared with the prior art, the casting model provided in this application for placing a heating riser sleeve on a vertical line has cold riser sections symmetrically set on both sides of the model body, and heating riser sections are also set on the top of the cold riser sections. After the sand mold cavity is made using the casting model, the heating riser sleeve can be placed at the position of the heating riser section. At the same time, the sand in the sand mold cavity can effectively fix the heating riser sleeve with interference fit at the sand pressing groove, so that the heating riser sleeve can be directly applied to the casting vertical line to solve the problem of poor feeding effect on the casting vertical line.
[0014] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description
[0015] Figure 1 A three-dimensional structural schematic diagram of the casting model used in this application for placing a heating riser sleeve in a vertical line is shown.
[0016] Figure 2 The diagram shows a front view of the casting model used in this application to place a heat-generating riser sleeve in a vertical line.
[0017] Figure 3 A side view of the casting model used in this application for placing a heating riser sleeve in a vertical line is shown.
[0018] Figure 4 A schematic diagram of the structure in which the cold riser and the hot riser cooperate in this application is shown. Detailed Implementation
[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.
[0020] Those skilled in the art should understand that, in the disclosure of this specification, 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 only for the convenience of describing this utility model and 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, the above terms should not be construed as limitations on this utility model.
[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0022] refer to Figures 1 to 4 This application provides a casting model for placing a heating riser sleeve on a vertical line, including a model body for forming a casting cavity. The model body has a symmetrical design, including a heating riser portion 10 located in the middle and a pouring cup portion 20 located on top of the heating riser portion 10. In other words, both the pouring cup portion 20 and the heating riser portion 10 are located in the middle and are arranged vertically. The heating riser portion 10 is symmetrically provided with casting cavity portions 30 on both sides, and a cold riser portion 40 is provided on the outer side of the casting cavity portion 30 (i.e., the side away from the heating riser portion 10). The heating riser portion 50 is provided on the top of the cold riser portion 40 for placing the heating riser sleeve. The side wall of the heating riser portion 50 is provided with a sand pressing groove 501.
[0023] During production, the positive pressure plate mold and the negative pressure plate mold enter the molding chamber. After the molding chamber is filled with mixed molding sand, it will be copied into a sand mold after being extruded. The automatic core-feeding machine fixes the heating riser sleeve at the position of the heating riser of the sand mold formed by the positive pressure plate mold. The sand mold made by the negative pressure plate mold is then closed with it to form a sand mold cavity. The molding sand will fill the sand pressing groove 501, and then the heating riser sleeve will be firmly fixed by interference fit. Molten iron flows from the pouring cup section 20 of the sand mold cavity into the hot riser section 10. To improve the purity and quality of the casting, a filter section 21 is provided at the bottom of the pouring cup section 20 to hold filter plates. After filtration, the molten iron flows through the hot riser section 10 into the casting cavity section 30. As the molten iron level in the casting cavity rises to the cold riser section 40, the low-temperature molten iron enters the cold riser. With the level continuing to rise, the molten iron flows from the cold riser into the heating riser sleeve. After pouring, the molten iron enters the solidification and shrinkage stage. The heating riser sleeve can burn after 5-7 seconds of contact with the molten iron, producing an exothermic reaction. This increases the temperature of the molten iron in the cold riser. When the temperature in the cold riser is higher than the temperature of the molten iron in the casting cavity, there is sufficient fluidity under pressure to compensate for the liquid shrinkage of the casting, ensuring a dense and defect-free casting. Thus, the heating riser sleeve can be placed and fixed on the vertical line of casting to solve the problem of poor feeding effect on the vertical line of casting.
[0024] In one embodiment, the pouring cup portion 20 is in the shape of an inverted cone, and the filter portion 21 is connected to the hot riser portion 10 through a cone portion 22 that is larger at the top and smaller at the bottom. The outer diameter of the filter portion 21 is larger than both the outer diameter of the bottom end of the pouring cup portion 20 and the maximum outer diameter of the cone portion 22, so that the filter sheet can be placed directly in the sand mold cavity and supported at the position of the filter portion 21.
[0025] More preferably, the filter is a silicon carbide foam ceramic filter, and the filter is honeycomb-shaped with a pore size of 10 PPi.
[0026] In one embodiment, the modulus of the hot riser 10 is 1.1 to 1.3 times that of the casting cavity 30. Modulus = Volume ÷ Cooling surface area. A larger modulus results in a longer cooling time and slower solidification. This 1.1 to 1.3 times ratio design ensures that the molten iron at the hot riser solidifies later than the molten iron in the casting cavity, thus providing sufficient molten iron to feed the casting.
[0027] In one embodiment, both the heating riser 50 and the cold riser 40 are cylindrical. The center of the heating riser 50 is offset outward by a predetermined distance α relative to the center of the cold riser 40, and the predetermined distance α is greater than the depth of the sand pressing groove 501. Furthermore, the sand pressing groove 501 is simultaneously formed on the front top and the front or rear top and rear sides of the heating riser 50, where the front or rear side refers to one side in the vertical direction of the plane where the model body is located. This allows both the heating riser 50 and the cold riser 40 to be designed and manufactured as standard parts, making them convenient to use. At the same time, this offset design can directly provide molding space to the sand pressing groove 501 through the offset protrusion. The sand pressing groove 501 located at the top can fix the heating riser sleeve in the height direction with an interference fit through the internal molding sand, while the sand pressing groove 501 located on the front or rear side can fix the heating riser sleeve in the diameter direction with an interference fit through the internal molding sand. This can firmly limit and fix the heating riser sleeve.
[0028] More preferably, the predetermined distance is 4mm-5mm, and the depth of the sand pressing groove 501 is 0.2mm-0.3mm.
[0029] More preferably, the width of the sand pressing groove 501 located at the top is 5mm-8mm, and the number of them can be designed as three. At the same time, the width of the sand pressing groove 501 located on the outside is 14mm-15mm, and the number of them can be designed as two on each side, one above the other, symmetrically arranged.
[0030] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.
Claims
1. A casting mold for placing a heating riser sleeve on a vertical line, characterized in that, The system includes a model body for forming a casting cavity. The model body is symmetrically designed and includes a hot riser located in the middle and a pouring cup located at the top of the hot riser. Casting cavity portions are symmetrically arranged on both sides of the hot riser. A cold riser portion is provided on the outer side of the casting cavity portion. A heating riser portion is provided at the top of the cold riser portion for placing the heating riser sleeve. The side wall of the heating riser portion is provided with a sand pressing groove.
2. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 1, characterized in that, The pouring cup is in the shape of an inverted cone. The bottom end of the pouring cup is connected to a filter section for placing a filter plate. The filter section is connected to the hot riser section through a cone section that is larger at the top and smaller at the bottom. The outer diameter of the filter section is larger than both the outer diameter of the bottom end of the pouring cup and the maximum outer diameter of the cone section.
3. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 2, characterized in that, The filter is a silicon carbide foam ceramic filter with a honeycomb structure and a pore size of 10 PPi.
4. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 1, characterized in that, The module of the hot riser is 1.1 to 1.3 times that of the module of the casting cavity.
5. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 1, characterized in that, Both the heating riser and the cooling riser are cylindrical. The center of the heating riser is offset outward by a predetermined distance relative to the center of the cooling riser. The predetermined distance is greater than the depth of the sand pressing groove. The sand pressing groove is simultaneously opened on the front top and the front or rear top and rear sides of the heating riser. The front or rear side refers to one side of the plane where the model body is located in the vertical direction.
6. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 5, characterized in that, The predetermined distance is 4mm-5mm, and the depth of the sand pressing groove is 0.2mm-0.3mm.
7. The casting mold for placing a heating riser sleeve on a vertical line as described in claim 6, characterized in that, The width of the sand pressing groove located at the top is 5mm-8mm, and the width of the sand pressing groove located on the outside is 14mm-15mm.