Framework traction seat casting and pouring system

Abstract

The utility model discloses a framework traction seat casting and pouring system, a framework traction seat comprises a forked starting end, two forked ends and a connecting rod part connected with the two forked ends, the tail ends of the forked ends are provided with arc grooves, the casting and pouring system is an investment casting and pouring system, and the connecting rod part is connected with the two forked ends. Comprising a wax mold, a basic silica sol mold shell wrapping the wax mold and a reinforced silica sol mold shell wrapping the basic silica sol mold shell, and further comprises a sprue and a plurality of ingates arranged on the sprue in a stepped mode, the ingates communicate with the reinforced silica sol mold shell and are arranged close to the bifurcated end of the framework traction base, and the reinforced silica sol mold shell is arranged close to the bifurcated end of the framework traction base. And a dead head is arranged on a thick and large part, corresponding to the framework traction seat, on the reinforced silica sol shell. According to the utility model, the framework traction seat is cast by adopting the investment casting gating system, the basic silica sol shell and the reinforced silica sol shell can effectively avoid the sand inclusion defect of a casting, multi-runner stepped water inflow in the casting gating system can ensure stable mold filling, further avoid local slag inclusion and air holes, and integrally improve the internal quality of a product.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a casting pouring system for a frame traction seat. Background Art

[0002] The frame traction seat casting is a welded component of the EMU frame and needs to withstand a large impact load, so there are high requirements for the size, external quality, and internal quality of the casting. The traditional production method of the structural traction seat is sand casting, and the casting mold is a sand mold. The sand casting process is prone to defects such as sand inclusion and shrinkage, and the surface roughness of the casting is Ra50~R100. The casting needs to be reworked frequently in subsequent processes, and it will seriously affect the welding quality of the casting and the main frame.

[0003] In order to improve the casting quality of the frame drawbar, the investment casting process is considered to replace the sand casting. The patent with announcement number CN104550749B discloses a molten steel casting channel for investment casting, including an intermediate cross-shaped casting channel that symmetrically connects two castings together, the cross-shaped casting channel includes an upper pouring port, two horizontally arranged cross runners and a vertically arranged straight runner downward, the two ends of the cross runners on both sides are connected downward to the upper ends of the castings connected in parallel below, the two sides of the lower part of the straight runner are respectively connected to the centers of the castings arranged on both sides, and the two castings are connected together, a notch is provided below the connection between the straight runner and the cross runner, so that the straight runner forms a corner-shaped downward tributary channel on both sides of the notch, and converges and connects to the straight runner below the notch; the upper pouring port in the cross-shaped casting channel is respectively connected to the outer ends of the cross runners on both sides by reinforcing connecting rods; the two sides of the lower part of the straight runner are respectively connected to the lateral surfaces of the corresponding side castings through evenly distributed horizontal connecting channels; it can better solve the shrinkage holes and shrinkage problems of castings.

[0004] The investment casting pouring channel disclosed in the above patent can effectively solve the problems of shrinkage cavities and shrinkage inside the casting, but the castings it targets are different from the frame drawbar, and it is mainly used to cast small castings of small volume. The frame drawbar is mainly used in power locomotives and has a large volume. At present, most of the frame drawbars on the market are sand-casted and have not been produced by investment casting process. Therefore, there is a lack of investment casting pouring system suitable for the frame drawbar. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a casting pouring system for a frame traction seat which eliminates sand inclusion defects and has good shrinkage compensation and deformation prevention effects in view of the defects of the prior art.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A casting system for a frame traction seat, the frame traction seat includes a forked starting end, two forked ends and a connecting rod portion connecting the two forked ends, the end of the forked end has an arc groove, the casting system is an investment casting system, including a wax mold, a basic silica sol mold shell covering the wax mold, and a reinforced silica sol mold shell covering the basic silica sol mold shell, and also includes a straight runner and a plurality of ingates arranged in a stepped manner on the straight runner, the ingates are connected to the reinforced silica sol mold shell, the ingates are arranged near the forked end of the frame traction seat, and a riser is provided on the reinforced silica sol mold shell at a thick and large part corresponding to the frame traction seat.

[0008] Furthermore, there are two ingates, namely a first ingate and a second ingate. The first ingate is connected to the bifurcated end of the corresponding frame traction seat on the reinforced silica sol shell, and the second ingate is connected to the connecting rod part of the corresponding frame traction seat on the reinforced silica sol shell.

[0009] Furthermore, the first ingrate also includes a process rib plate embedded in the circular arc groove.

[0010] Furthermore, process holes are provided on the process rib plate to prevent deformation.

[0011] Furthermore, the casting pouring system also includes a backing mold, which is used to support the wax mold to cool and shape, and the backing mold and the wax mold are structurally adapted at the supporting contact part.

[0012] Furthermore, there are two risers, which are respectively arranged on the bifurcated starting end and the connecting rod part of the corresponding frame traction seat of the reinforced silica sol shell.

[0013] Furthermore, the basic silica sol type shell has 1 to 3 layers.

[0014] Furthermore, the number of the reinforced silica sol shell layers is 1 to 5 layers.

[0015] Furthermore, mold shell ribs are placed on the surface of the basic silica sol mold shell at thick and large parts corresponding to the frame traction seat.

[0016] Furthermore, the mold shell reinforcement is placed at a position corresponding to the circular arc groove of the frame traction seat.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The investment casting pouring system is adopted to cast the frame traction seat. Its basic silica sol mold shell and reinforced silica sol mold shell can effectively avoid sand inclusion defects in the casting. The multi-step water inlet of the casting pouring system can ensure smooth filling, reduce the local vortex in the filling cavity, facilitate slag and exhaust, and further avoid local slag inclusion and air holes, thereby improving the overall internal quality of the product, reducing rework in the product production process, improving production efficiency and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the casting pouring system described in Example 1;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the casting pouring system described in Example 1;

[0021] Figure 3 This is a schematic diagram of the structure of the master mold and wax mold described in Example 1. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of the present solution, the present technical solution is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0024] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0027] Example 1

[0028] Provide a Figure 1 The casting pouring system shown is used to produce a frame fifth wheel, such as Figure 2 As shown, the frame traction seat includes a forked start end 11, two forked ends 12 and a connecting rod portion 13 connecting the two forked ends, wherein the end of the forked end has an arc groove 14. The casting system is an investment casting system, which includes a wax mold 2 (wax mold see Figure 3 As shown), the basic silica sol mold shell coated with the wax mold and the reinforced silica sol mold shell 3 coated with the basic silica sol mold shell also include a straight runner 41 and a plurality of ingates arranged in a stepped manner on the straight runner, and the ingates are arranged near the bifurcated end of the frame traction seat. In this embodiment, there are two ingates, namely the first ingates 42 and the second ingates 43, wherein the first ingates 42 are connected to the bifurcated end 12 of the frame traction seat on the reinforced silica sol mold shell, and the second ingates 43 are connected to the connecting rod part 13 of the frame traction seat on the reinforced silica sol mold shell; a riser 5 is provided at the thick part of the corresponding frame traction seat on the reinforced silica sol mold shell 3, and combined with the structural characteristics of the frame traction seat, the number of risers 5 is two, which are respectively arranged on the bifurcated starting end 11 and the connecting rod part 13 of the frame traction seat of the reinforced silica sol mold shell, and the position arrangement of the two risers is conducive to the shrinkage compensation of the thermal node in the thick part. The riser 5 is connected with an exhaust strip 6, which has the functions of exhausting wax and exhausting gas, and is also used to assist in fixing the riser.

[0029] This casting system adopts investment casting to produce the frame traction seat. The silica sol shell setting can effectively avoid sand inclusion defects in the product. The side injection process and the stepped water inlet of the ingrate can significantly improve the internal quality of the product. The molten steel is poured into the cavity layer by layer from bottom to top through the ingrate. The molten steel fills the mold smoothly, which can reduce the turbulent state during filling and the local vortex in the cavity, which is conducive to slag and exhaust, and avoids local slag inclusion and air holes.

[0030] To prevent the casting from deforming at the arc groove, the first ingrowth also includes a process rib plate 7 embedded in the arc groove 14. A process hole 71 is also provided on the process rib plate 7 to prevent deformation. The process rib plate 7 is part of the ingrowth. During the pouring process, the process rib plate can stably and reliably support the arc groove structure.

[0031] Because the frame traction seat is large in size and has an irregular structure, the wax mold 2 cannot be placed stably after being prepared, so the casting pouring system is also equipped with the following Figure 3 The support mold 8 shown is structurally adapted to the wax mold 2 at the local supporting contact portion. The support mold 8 is used to support the wax mold to cool and shape, and prevent the wax mold from deforming when cooling.

[0032] In this embodiment, the number of basic silica sol shell layers is 3, and the number of reinforced silica sol shell layers 3 is 5. The material and thickness specifications used for each layer can be different and can be selected according to the actual situation of the frame traction seat. The reinforced silica sol shell 3 is a reverse copy shell in order to achieve the shell strength (i.e., to achieve the strength required for casting), and the greater the total thickness of the shell, the higher the strength.

[0033] like Figure 1 As shown, the casting pouring system is combined with the specific process design requirements of the frame traction seat, and a mold shell rib 9 is also placed on the surface of the basic silica sol mold shell corresponding to the arc groove 14 of the frame traction seat. This place is also the thickest part of the frame traction seat. The mold shell rib 9 can enhance the local strength of the basic silica sol mold shell, prevent the liquid metal from causing deformation and cracking of the mold shell due to high temperature and internal pressure at the local weak parts of the cavity during pouring, and effectively prevent deformation and swelling of the thick part of the casting.

[0034] The casting pouring system of this embodiment has a compact structure and is easy to operate. The shell structure is stable. The arrangement of process ribs and shell ribs and the closed structural design of the casting pouring system can prevent shrinkage and stress deformation of the casting. The investment casting pouring system is used to replace traditional sand casting, which can avoid local slag inclusions and pores to the greatest extent. The surface roughness of the investment casting is Ra25~Ra5, which is significantly improved compared with the Ra50~R100 of sand casting, and the appearance quality of the casting is significantly improved, the possibility of rework in the casting production process is greatly reduced, the production efficiency is improved, and the manufacturing cost is reduced.

[0035] Example 2

[0036] A kind of Figure 1 The casting pouring system of the frame traction seat shown in the figure is an investment casting pouring system, which includes a wax mold 2 (wax mold see Figure 3 As shown), the basic silica sol mold shell coated with the wax mold and the reinforced silica sol mold shell 3 coated with the basic silica sol mold shell also include a straight runner 41 and a plurality of ingates arranged in a stepped manner on the straight runner, and the ingates are arranged near the bifurcated end of the frame traction seat. In this embodiment, there are two ingates, namely the first ingates 42 and the second ingates 43, wherein the first ingates 42 are connected to the bifurcated end 12 of the frame traction seat on the reinforced silica sol mold shell, and the second ingates 43 are connected to the connecting rod part 13 of the frame traction seat on the reinforced silica sol mold shell; a riser 5 is provided at the thick part of the corresponding frame traction seat on the reinforced silica sol mold shell 3, and combined with the structural characteristics of the frame traction seat, the number of risers 5 is two, which are respectively arranged on the bifurcated starting end 11 and the connecting rod part 13 of the frame traction seat of the reinforced silica sol mold shell, and the position arrangement of the two risers is conducive to the shrinkage compensation of the thermal node in the thick part. The riser 5 is connected with an exhaust strip 6, which has the functions of exhausting wax and exhausting gas, and is also used to assist in fixing the riser.

[0037] To prevent the casting from deforming at the arc groove, the first ingrowth also includes a process rib plate 7 embedded in the arc groove 14. A process hole 71 is also provided on the process rib plate 7 to prevent deformation. The process rib plate 7 is part of the ingrowth. During the pouring process, the process rib plate can stably and reliably support the arc groove structure.

[0038] Because the frame traction seat is large in size and has an irregular structure, the wax mold 2 cannot be placed stably after being prepared, so the casting pouring system is also equipped with the following Figure 3 The support mold 8 shown is structurally adapted to the wax mold 2 at the local supporting contact portion. The support mold 8 is used to support the wax mold to cool and shape, and prevent the wax mold from deforming when cooling.

[0039] The difference between this embodiment and embodiment 1 is that the number of layers of the basic silica sol type shell is 2, and the number of layers of the reinforced silica sol type shell 3 is 4.

[0040] like Figure 1 As shown, the casting pouring system is combined with the specific process design requirements of the frame traction seat, and a mold shell rib 9 is also placed on the surface of the basic silica sol mold shell corresponding to the arc groove 14 of the frame traction seat. This place is also the thickest part of the frame traction seat. The mold shell rib 9 can enhance the local strength of the basic silica sol mold shell, prevent the liquid metal from causing deformation and cracking of the mold shell due to high temperature and internal pressure at the local weak parts of the cavity during pouring, and effectively prevent deformation and swelling of the thick part of the casting.

[0041] Example 3

[0042] This embodiment describes the process of manufacturing the frame traction seat by the casting pouring system in Embodiment 1:

[0043] S1. Use the frame traction seat product mold to make a wax mold, and place the wax mold on the template to cool and shape it.

[0044] S2. Make wax model sets according to the casting process drawing of the frame traction seat.

[0045] S3. Prepare 1 to 3 layers of basic silica sol shell on the wax mold.

[0046] S4. Prepare 1 to 5 layers of reinforced silica sol shell on the basic silica sol shell, and complete the shell making after reaching the strength required for casting.

[0047] S5. Dewaxing, dissolving the wax mold, and completing the silica sol shell production.

[0048] S6. The shell is sintered at 1200℃ to improve the shell strength.

[0049] S7. Pour the molten steel into the fired shell.

[0050] S8. Shelling, removal of risers, heat treatment, shot blasting, finishing.

[0051] Obviously, the above embodiments are merely examples for clearly illustrating the technical solution of the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A casting system for a frame traction seat, the frame traction seat comprising a forked start end, two forked ends, and a connecting rod connecting the two forked ends, the end of the forked end having an arc groove, characterized in that: The casting pouring system is an investment casting pouring system, including a wax mold, a basic silica sol mold shell covering the wax mold, and a reinforced silica sol mold shell covering the basic silica sol mold shell, and also includes a straight runner and a plurality of ingates arranged in a stepped manner on the straight runner, the ingates are connected to the reinforced silica sol mold shell, the ingates are arranged near the bifurcated end of the frame traction seat, and a riser is provided on the reinforced silica sol mold shell at a thick and large part corresponding to the frame traction seat.

2. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: There are two ingates, namely a first ingate and a second ingate. The first ingate is connected to a bifurcated end of a corresponding frame traction seat on the reinforced silica sol shell, and the second ingate is connected to a connecting rod portion of a corresponding frame traction seat on the reinforced silica sol shell.

3. The casting pouring system for the frame fifth wheel according to claim 2, characterized in that: The first ingrate also includes a process rib plate embedded in the arc groove.

4. The casting pouring system for the frame fifth wheel according to claim 3, characterized in that: The process rib plate is provided with process holes to prevent deformation.

5. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: The casting pouring system also includes a backing mold, which is used to support the wax mold to cool and set, and the backing mold and the wax mold are structurally adapted at the supporting contact part.

6. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: There are two risers, which are respectively arranged on the bifurcated start end and the connecting rod part of the corresponding frame traction seat of the reinforced silica sol shell.

7. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: The basic silica sol type shell layer number is 1 to 3 layers.

8. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: The number of the reinforced silica sol shell layers is 1 to 5.

9. The casting pouring system for the frame fifth wheel according to claim 1, characterized in that: The surface of the basic silica sol shell is provided with shell reinforcements at the thick and large parts corresponding to the frame traction seat.

10. The casting pouring system for the frame fifth wheel according to claim 9, characterized in that: The mold shell reinforcement is placed at the corresponding position of the circular arc groove of the frame traction seat.

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