Cold core for supercharger turbine wax pattern molding

Abstract

The utility model relates to a cold core for supercharger turbine wax mould forming, include: cold core main part, the centre of cold core main part is equipped with through -hole, the through -hole is used for with the sprue insert sleeve joint of wax mould forming mould centre, a plurality of cold core blades, the number of cold core blade is identical with wax mould blade quantity, and the distance between adjacent cold core blade is identical with the pitch of wax mould blade, wherein, after the through -hole sleeve joint on sprue insert, the first gap between the cavity of mould and cold core main part, the cold core blade is located at the cavity corresponding with wax mould blade, the second gap between cold core blade and cavity, the cold core blade is located in the wax mould blade when wax mould forms, offsets the deformation when wax mould blade forms, to be shaped in the wax mould of mould can satisfy the requirement of the wax mould deformation amount for casting.

Description

Technical Field

[0001] This utility model relates to the field of precision casting technology, and in particular to a cold core for wax molding of turbocharger turbines. Background Technology

[0002] In the process of investment casting to form the blades of a turbocharger turbine, the formation of the wax pattern is a very important step, which has a significant impact on the final appearance and dimensions of the casting.

[0003] To control the amount of deformation of the wax model, a cold core with a regular rotating structure is usually placed in the mold for forming the wax model, so as to keep the deformation of the wax model within the tolerance range.

[0004] However, for turbines with larger dimensions (such as diameters of 200 and above), the above molding method cannot meet the requirements for controlling the deformation of the wax model. The wax model needs to be corrected after molding, which affects the molding efficiency of the wax model. Utility Model Content

[0005] In response to the shortcomings of the existing production technology, the applicant provides a cold core for forming wax patterns of turbocharger turbines, so that the wax pattern formed in the mold can meet the casting requirements for the deformation of the wax pattern.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A cold core for supercharger turbine wax molding, comprising:

[0008] The cold core body has a through hole in the center, which is used to connect with the gate insert in the center of the wax mold forming mold.

[0009] Multiple cold core blades, the number of cold core blades is the same as the number of wax mold blades, and the distance between adjacent cold core blades is the same as the spacing between the wax mold blades;

[0010] Wherein, after the through hole is fitted onto the gate insert, there is a first gap between the mold cavity and the cold core body, the cold core blade is located in the cavity corresponding to the wax mold blade, there is a second gap between the cold core blade and the cavity, and the cold core blade is located in the wax mold blade during wax molding to counteract the deformation of the wax mold blade during molding.

[0011] As a further improvement to the above technical solution:

[0012] The cold core body is a rotating body centered on the axis of the through hole, and the first gap is 2mm-7mm.

[0013] The cold core blade and the wax mold blade extend in the same direction, and the second gap is 2mm-5mm.

[0014] The cold core blades and the cold core body are respectively molded and then assembled into one piece.

[0015] The connection between the cold core blade and the cold core body includes a blade root. The bottom of the blade root and the outer surface of the cold core body are provided with a groove on one side and a protrusion on the other side. The length direction of both the groove and the protrusion extends along the length direction of the blade root. The protrusion and the groove are inserted to assemble the cold core blade and the cold core body into one piece.

[0016] The groove is located on the outer surface of the cold core body, and the protrusion is located at the bottom of the blade root.

[0017] The bottom of the groove is provided with a plurality of positioning grooves spaced apart along the length of the leaf root, and the surface of the protrusion facing the groove is provided with a plurality of positioning blocks that are inserted into the positioning grooves.

[0018] The through hole is provided with a positioning structure that cooperates with the gate insert.

[0019] The cold core blade is provided with a thinning structure.

[0020] The cold core material is wax, and the cold core blades and the cold core body are assembled together by bonding or hot stamping.

[0021] The beneficial effects of this utility model are as follows:

[0022] This utility model has a compact and reasonable structure and is easy to operate. By setting multiple cold core blades on the cold core body, they serve as "cold cores" for the wax mold blades during the wax mold forming process, thus offsetting the deformation of the wax mold blades during forming and enabling the wax mold formed in the mold to meet the casting requirements for the deformation of the wax mold.

[0023] This utility model also has the following advantages:

[0024] (1) The cold core blades and the cold core body are formed separately, which makes it easier to design and adjust the local structure of the cold core (i.e., the cold core blades) in the design stage of the turbine forming process, targeting the easily deformable wax mold blades. This improves the accuracy of the cold core structure, reduces the cost of cold core forming, and thus reduces the cost in the new product development process.

[0025] (2) Protrusions and grooves are formed on the blade root and the cold core body respectively, and the positioning connection between the cold core blade and the cold core body is achieved through the plug-in structure.

[0026] (3) By setting multiple positioning grooves and positioning blocks in a mating structure of a groove and a protrusion, the cold core blade is positioned twice after the groove and the protrusion come into contact, thereby reducing the positioning error of the cold core blade caused by the mating gap between the groove and the protrusion.

[0027] (4) By thinning the structure to control the local deformation of the wax mold blades, when the cold core is a split structure, the thinning structure is formed by forming mold, so as to realize the fine adjustment of the cold core structure and shorten the production process design cycle. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0029] Figure 2 The diagrams shown are exploded views of embodiments two and three of this utility model.

[0030] Figure 3 This is a schematic diagram of the structure of the cold core body in Embodiment 2 of this utility model.

[0031] Figure 4 This is a schematic diagram of the structure of the cold core body in Embodiment 2 of this utility model.

[0032] Figure 5 This is a schematic diagram of the structure of the cold core blades in embodiments two and three of this utility model.

[0033] Figure 6 This is a schematic diagram of the structure of the cold core blade in Embodiment 2 of this utility model.

[0034] Among them: 1. Cold core body; 10. Through hole; 101. Positioning structure; 11. Groove; 111. Positioning slot; 2. Cold core blade; 20. Thinning structure; 21. Blade root; 22. Protrusion; 221. Positioning block. Detailed Implementation

[0035] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0036] Example 1:

[0037] like Figure 1 As shown, the cold core used for wax molding of turbocharger turbine in this embodiment includes a cold core body 1 and multiple cold core blades 2.

[0038] The cold core body 1 has a through hole 10 at its center, which is used to connect with the gate insert at the center of the wax mold forming mold.

[0039] The number of cold core blades 2 is the same as the number of wax mold blades, and the distance between adjacent cold core blades 2 is the same as the spacing between wax mold blades;

[0040] When the through hole 10 is fitted onto the gate insert, there is a first gap between the mold cavity and the cold core body 1. The cold core blade 2 is located in the cavity corresponding to the wax mold blade. There is a second gap between the cold core blade 2 and the cavity. When the wax mold is formed, the cold core blade 2 is located in the wax mold blade to counteract the deformation of the wax mold blade during the forming process.

[0041] The cold core with cold core blade 2 is suitable for wax molding of turbines with a diameter of 200 mm or more, preferably with a diameter of 200 mm to 500 mm.

[0042] By setting multiple cold core blades 2 on the cold core body 1, they serve as "cold cores" for the wax pattern blades during wax pattern forming, thus offsetting the deformation of the wax pattern blades during forming and enabling the wax pattern formed in the mold to meet the casting requirements for the deformation of the wax pattern.

[0043] The cold core body 1 is a rotating body centered on the axis of the through hole 10, with a first gap of 2mm-7mm.

[0044] Specifically, the first gap between different parts of the cavity and the cold core body 1 may be different, and it is sufficient to be within the range of 2mm-7mm.

[0045] The cold core blade 2 extends in the same direction as the wax mold blade, and the second gap is 2mm-5mm.

[0046] Specifically, the extension direction includes the direction of the wax mold blade away from the cold core body 1 and the direction along the radial direction of the cold core body 1; the blade shape of the cold core blade 2 can be consistent with the blade shape of the wax mold blade, that is, when the center point of the cold core blade 2 coincides with that of the wax mold blade, the curved surfaces of the two are equidistantly offset. The blade shape of the cold core blade 2 can also be slightly different from that of the wax mold blade at local positions, thereby offsetting local shrinkage deformation such as thinning, thickening, and torsion; the second gap between the wax mold blade and the cold core blade 2 at different parts of the cavity may be different, which can be satisfied within the range of 2mm-7mm.

[0047] Example 2:

[0048] Because the cold core structure may not meet the requirements during the development of new products, it is necessary to adjust the cold core structure, especially the cold core blade 2 part, multiple times. When the cold core is made of wax, the local structure of the cold core blade 2 can be adjusted manually to make the blade shape and blade thickness of the final trial casting meet the requirements. However, the accuracy is low and it cannot guarantee that the size of each cold core blade 2 is consistent, which is not conducive to accurately determining the turbine production process.

[0049] like Figures 2-6 As shown, the cold core used for wax molding of turbocharger turbine in this embodiment is wherein the cold core blades 2 and the cold core body 1 are respectively molded and then assembled into one piece.

[0050] Specifically, by individually changing the forming mold of the cold core blade 2, the local dimensions of the casting blade can be adjusted if they do not meet the requirements. Compared with the mold for forming the cold core as a whole, the forming mold of the cold core blade 2 has a simpler structure and shorter development cycle, and is more convenient for adjusting the cold core structure and precision forming during the development process.

[0051] The cold core blade 2 and the cold core body 1 are formed separately, which facilitates the design and adjustment of the local structure of the cold core (i.e., the cold core blade 2) in the design stage of the turbine forming process, targeting the easily deformable wax mold blade area. This improves the accuracy of the cold core structure, reduces the cost of cold core forming, and thus reduces the cost in the new product development process.

[0052] For example, such as Figure 2 , Figure 3 As shown, the connection between the cold core blade 2 and the cold core body 1 includes a blade root 21. The bottom of the blade root 21 and the outer surface of the cold core body 1 are provided with a groove 11 on one side and a protrusion 22 on the other side. The length direction of both the groove 11 and the protrusion 22 extends along the length direction of the blade root 21. The protrusion 22 and the groove 11 are inserted to assemble the cold core blade 2 and the cold core body 1 into one piece.

[0053] A protrusion 22 and a groove 11 are formed on the blade root 21 of the cold core blade 2 and the cold core body 1, respectively, and the positioning connection between the cold core blade 2 and the cold core body 1 is achieved through the plug-in structure.

[0054] Specifically, the dimensions of the groove 11 and the protrusion 22 in both the length and width directions do not exceed the bottom dimension of the leaf root 21.

[0055] In a specific embodiment, such as Figure 2 , Figure 3 As shown, the groove 11 is located on the outer surface of the cold core body 1, and the protrusion 22 is located at the bottom of the blade root 21. This facilitates the molding of the cold core body 1 and the protrusion 22, as well as the demolding design of the mold.

[0056] For example, such as Figure 4 , Figure 5 As shown, the bottom of the groove 11 is provided with a plurality of positioning grooves 111 spaced apart along the length of the leaf root 21, and the surface of the protrusion 22 facing the groove 11 is provided with a plurality of positioning blocks 221 that are inserted into the positioning grooves 111.

[0057] Specifically, there are two positioning grooves 111 in each groove 11, both the positioning grooves 111 and the positioning blocks 221 are columnar, there are two positioning blocks 221 on each protrusion 22, and the end of the protrusion 22 is spherical.

[0058] By setting multiple positioning grooves 111 and positioning blocks 221 in the mating structure of a groove 11 and a protrusion 22, the cold core blade 2 is positioned twice after the groove 11 and the protrusion 22 come into contact, thereby reducing the positioning error of the cold core blade 2 caused by the mating gap between the groove 11 and the protrusion 22.

[0059] Example 3:

[0060] like Figure 2 , Figure 5 As shown, the cold core for supercharger turbine wax molding in this embodiment, based on the above embodiments, has a positioning structure 101 on the through hole 10 that cooperates with the gate insert.

[0061] Specifically, the positioning structure 101 is a notch set at the end of the through hole 10, and the gate insert is provided with a protrusion corresponding to the notch. The positioning of the cold core placement posture is achieved by the cooperation of the notch and the protrusion, thereby ensuring the accuracy of the position of the cold core blade 2 in the cavity.

[0062] The cold core blade 2 is provided with a thinning structure 20.

[0063] Specifically, the thinning structure 20 can be a perforation or a recess, and the local deformation of the wax mold blades can be controlled by the thinning structure 20. When the cold core is a split structure, the thinning structure 20 is formed by a molding die, so as to realize the fine adjustment of the cold core structure and shorten the production process design cycle.

[0064] The cold core is made of wax, and the cold core blades 2 and the cold core body 1 are assembled together by bonding or hot stamping. This facilitates the separate molding and assembly of the cold core.

[0065] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A cold core for wax pattern forming of a supercharger turbine, characterized by: include: The cold core body (1) has a through hole (10) at its center, which is used to connect with the gate insert at the center of the wax mold forming mold. Multiple cold core blades (2), the number of cold core blades (2) is the same as the number of wax mold blades, and the distance between adjacent cold core blades (2) is the same as the spacing between the wax mold blades; Wherein, after the through hole (10) is fitted onto the gate insert, there is a first gap between the cavity of the mold and the cold core body (1), the cold core blade (2) is located in the cavity corresponding to the wax mold blade, and there is a second gap between the cold core blade (2) and the cavity. When the wax mold is formed, the cold core blade (2) is located in the wax mold blade to counteract the deformation of the wax mold blade during forming.

2. A cold core for wax pattern forming of a supercharger turbine as defined in claim 1, wherein: The cold core body (1) is a rotating body centered on the axis of the through hole (10), and the first gap is 2mm-7mm.

3. A cold core for wax pattern forming of a supercharger turbine as defined in claim 1, wherein: The cold core blade (2) extends in the same direction as the wax mold blade, and the second gap is 2mm-5mm.

4. A cold core for wax pattern forming of a supercharger turbine as defined in claim 1, wherein: The cold core blade (2) and the cold core body (1) are respectively molded and then assembled into one piece.

5. A cold core for wax pattern forming of a supercharger turbine as defined in claim 4, wherein: The connection between the cold core blade (2) and the cold core body (1) includes a blade root (21). The bottom of the blade root (21) and the outer surface of the cold core body (1) are provided with a groove (11) on one side and a protrusion (22) on the other side. The length direction of the groove (11) and the protrusion (22) are both extended along the length direction of the blade root (21). The protrusion (22) and the groove (11) are inserted to assemble the cold core blade (2) and the cold core body (1) into one unit.

6. The cold core for turbocharger turbine wax molding as described in claim 5, characterized in that: The groove (11) is located on the outer surface of the cold core body (1), and the protrusion (22) is located at the bottom of the blade root (21).

7. The cold core for turbocharger turbine wax molding as described in claim 5, characterized in that: The bottom of the groove (11) is provided with a plurality of positioning grooves (111) spaced apart along the length direction of the leaf root (21), and the surface of the protrusion (22) facing the groove (11) is provided with a plurality of positioning blocks (221) that are inserted into the positioning grooves (111).

8. The cold core for turbocharger turbine wax molding as described in claims 1-7, characterized in that: The through hole (10) is provided with a positioning structure (101) that cooperates with the gate insert.

9. The cold core for turbocharger turbine wax molding as described in claims 1-7, characterized in that: The cold core blade (2) is provided with a thinning structure (20).

10. The cold core for turbocharger turbine wax molding as described in claims 4-7, characterized in that: The cold core material is wax, and the cold core blades (2) and the cold core body (1) are assembled together by bonding or hot stamping.

Images