Flow gate structure for precisely casting turbocharger

Abstract

The utility model provides an inner gate structure for precisely casting a turbocharger, the inner gate structure is fixed at the lower end of a part, the part is a disc-shaped cover plate, a plurality of parts are integrally formed by connecting the inner gate structure in series, and the inner gate structure is characterized by comprising a gate body which is of a cylindrical structure; the sprue body penetrates through the sprue body in the axial direction and fixes parts, a side sprue is arranged on one side of the lower portion of the sprue body, the side sprue protrudes in the radial direction and extends to the outer edge of the lowermost part, and the upper end of the side sprue and the lowermost part are integrally formed; the small pouring gate is additionally arranged on the side face of the inner pouring gate and extends to the edge of the cover plate, and the lowest position of wax liquid of a product is flush with a pouring gate during dewaxing, so that dewaxing of cover plate type parts is smooth without residues; the design of the small pouring gate also increases the contact surface of the assembly tree, reduces the rejection rate of falling parts, has no wax material residue during dewaxing, reduces the bad casting during pouring, and improves the qualified rate of products.

Description

Technical Field

[0001] The utility model relates to the technical field of precision casting, in particular to a gate structure for precision casting of a turbocharger. Background Art

[0002] At present, in order to pursue a high-quality, high-surface finish and less machining allowance production casting process for some parts in the automotive turbocharger wastegate valve system, precision casting is generally adopted. The wastegate valve is usually a part weighing from a few grams to dozens of grams. To improve production efficiency, usually a string is composed of multiple parts and a gating system, and a gate is set at a certain part of the part to connect with the gating system.

[0003] In the investment casting process, a wax pattern similar to the shape of the part is first pressed, then a refractory material is coated on the surface of the wax part, and then the wax pattern is melted by a steam dewaxing kettle to form wax water and discharged. Due to the different expansion coefficients of wax and refractory material, if the gate is not reasonably set, the whole string of products is likely to be scrapped.

[0004] In the conventional design of the gate of the casting factory cover plate part, the gate is designed at the center position of the plate surface. The wax below the position of the cover plate part structure lower than the gate cannot be completely discharged, and the carbide, ash, etc. generated by the residual wax after roasting will cause defects such as relevant slag holes and sundries during pouring, thus affecting the surface and internal quality of the casting.

[0005] Therefore, there is an urgent need for a new gate structure that can solve the above problems to improve product quality and reduce costs. Summary of the Invention

[0006] The purpose of the utility model is to provide a gate structure for precision casting of a turbocharger.

[0007] To achieve the above purpose, the technical solution of the utility model is as follows:

[0008] A gate structure for precision casting of a turbocharger, the gate structure is fixed at the lower end of the part, the part is a disc-shaped cover plate, and several parts are integrally formed in series by the gate structure. It is characterized in that the gate structure includes a gate body, the gate body is in a cylindrical structure, the gate body axially penetrates and fixes the part, a side gate is arranged on one side of the lower part of the gate body, the side gate protrudes radially, the side gate extends to the outer edge of the lowermost part, and the upper end of the side gate is integrally formed with the lowermost part.

[0009] Furthermore, the outer end of the side gate is in a semi-circular arc shape.

[0010] The utility model adds a small gate on the side of the inner gate, and the small gate extends to the edge of the cover plate, so that the lowest level of the product wax liquid is flush with the runner during dewaxing, and the dewaxing of the cover plate parts is smooth without residue; the design of the small gate also increases the contact surface of the tree assembly, reduces the scrap rate of dropped parts, there is no residue of the wax material during dewaxing, reduces the defects of the castings during pouring, and improves the qualified rate of the products. Brief Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a side view of the gate of the utility model.

[0013] Figure 3 It is a front view of the gate of the utility model.

[0014] Figure 4 It is a schematic diagram of the tree assembly of the utility model.

[0015] Figure 5 It is an upper die view of the mold cavity of the utility model.

[0016] Figure 6 It is a lower die view of the mold cavity of the utility model.

[0017] Figure 7 It is a mold clamping state diagram of the utility model.

[0018] Reference Signs:

[0019] 1 Part, 2 Gate Body, 3 Side Gate, 4 Upper Die, 5 Upper Die Groove,

[0020] 6 Lower Die, 7 Horizontal Runner, 8 Longitudinal Runner, 9 Lower Die Groove, 10 Side Gate Groove. Specific Embodiments

[0021] Next, the technical solutions of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of them. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0022] The utility model discloses an inner gate structure for precision casting of a turbocharger, as Figures 1 to 3As shown in the figure, the ingate structure is fixed to the lower end of part 1. Part 1 is a disc-shaped cover plate. A number of part 1 are integrally formed by being connected in series through the ingate structure. The ingate structure includes an ingate body 2. The ingate body 2 is in a cylindrical structure. The ingate body 2 penetrates through and is fixed to part 1 along the axial direction. On one side of the lower part of the ingate body 2, there is a side ingate 3. The side ingate 3 protrudes radially. The side ingate 3 extends to the outer edge of the lowermost part 1. The outer end of the side ingate 3 is in a semi-circular arc shape. The upper end of the side ingate 3 is integrally formed with the lowermost part 1.

[0023] As Figure 4 shown in the figure, since the side ingate 3 is added to the ingate structure, the contact surface between the ingate structure and the runner increases, improving the bonding degree of the tree assembly.

[0024] When the present utility model is put into use, as Figures 5 to 7 shown in the figure, at the lower end of the upper die 4 of the mold cavity, there is an upper die groove 5 that cooperates with part 1. At the upper end of the lower die 6, there are a transverse runner 7 and a longitudinal runner 8. At the connection of the transverse runner 7 and the longitudinal runner 8, there is a lower die groove 9 that cooperates with the lower end of the ingate body 2. At the inner end of the transverse runner 7, there is a side runner groove 10 that cooperates with the side ingate 3.

[0025] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An ingate structure for precision casting of a turbocharger, the ingate structure being fixed to the lower end of a part (1), the part (1) being a disc-shaped cover plate, and a plurality of parts (1) being integrally formed by being connected in series by the ingate structure, characterized in that, The internal gate structure includes a gate body (2), the gate body (2) is of a cylindrical structure, the gate body (2) axially penetrates and fixes the part (1), one side of the lower part of the gate body (2) is provided with a side gate (3), the side gate (3) protrudes radially, the side gate (3) extends to the outer edge of the lowermost part (1), and the upper end of the side gate (3) is integrally formed with the lowermost part (1).

2. The internal gate structure for precision casting of a turbocharger according to claim 1, characterized in that, The outer end of the side gate (3) is in a semi-circular arc shape.

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