Vortex fixed plate product mold assembly and manufacturing method thereof

Abstract

The invention discloses a vortex fixed plate product mold assembly and a manufacturing method thereof, and belongs to the technical field of workpiece casting processes. The mold assembly comprises a vortex fixed disc mold, a vertical pouring gate, a large dead head, a transverse pouring gate and an inner pouring gate, the vortex fixed disc molds are vertically arranged and are arranged in a square shape; the vertical pouring gate is vertically arranged in the center of the square; the large risers are vertically arranged between the vertical vortex fixed disc molds; the cross gate is connected and communicated between the vertical gate and the large riser; the inner gate is connected and communicated between the vortex fixed disc mold and the large riser; and the section shapes of the vertical pouring gate, the transverse pouring gate and the inner pouring gate are respectively circular, high trapezoidal and square. In the mold pouring process, the layout that an inner pouring gate is connected with the circumference of a vortex fixed disc in the traditional design is changed; according to the mold assembly, the traditional thought that the inner pouring gate is arranged at the symmetric center position is broken through, so that liquid metal is more uniform in the solidification process, the defects caused by non-uniform solidification are reduced, and the quality of a vortex fixed disc casting is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of workpiece casting process, more particularly to a vortex stator product mold assembly and a manufacturing method thereof. BACKGROUND

[0002] The vortex stator is designed with a special vortex profile, cooperates with another vortex runner to form a closed space, and realizes the compression of gas through the reciprocating movement of the runner, and is usually used in devices such as compressors, heat pumps and turbines. Due to the complex structure and the requirement of mutual movement of the runner and the stator in the working environment, the manufacturing of the vortex stator requires higher requirements, especially for large vortex stators, the technical problems in the casting process are more prominent.

[0003] The mold of the existing vortex stator product is usually designed to be horizontally placed in the casting sand box, and the sprue is connected with the outer cylindrical surface of the vortex stator. Based on the traditional casting method, this design can effectively realize the flow and solidification of the liquid metal, especially the uniform material of the disc body in the center line direction, thereby helping to improve the service life. However, this design has obvious problems for the vortex stator product, which is easy to cause defects such as shrinkage holes and shrinkage in the hot spot of the casting, especially when the vortex stator is heavy and the thickness difference between different positions is large. SUMMARY

[0004] 1. Technical problems to be solved by the present application

[0005] In view of the above problems in the prior art vortex stator processing, the present application provides a vortex stator product mold assembly and a manufacturing method thereof, which optimizes the shape and connection mode of the sprue, effectively solves the phenomenon of shrinkage and shrinkage hole defects in the parts with large thickness of the vortex stator casting, improves the feeding efficiency of the riser, ensures the density of the casting, and significantly improves the casting yield.

[0006] 2. Technical solutions

[0007] To achieve the above-mentioned purposes, the technical solutions provided by the present application are as follows:

[0008] A scroll plate product mold assembly, comprising a scroll plate mold, a vertical gate, a large riser, a horizontal gate and an inner gate; the scroll plate mold is vertical and arranged in a square; the vertical gate is vertically arranged at the center of the square; the large riser is vertically arranged between the scroll plate molds; the horizontal gate is connected and communicated between the vertical gate and the large riser; the inner gate is connected and communicated between the scroll plate mold and the large riser; the cross-sectional shapes of the vertical gate, the horizontal gate and the inner gate are circular, high trapezoidal and square respectively. In the mold pouring process, the layout of the inner gate connected with the circumference of the scroll plate in the traditional design is changed; this design innovation breaks the traditional idea of setting the inner gate at the center of symmetry, thereby making the liquid metal more uniform during solidification, reducing defects caused by uneven solidification and improving the quality of the scroll plate casting.

[0009] Further scroll plate product mold assembly, the maximum cross section of the horizontal gate to the cross-sectional area of the inner gate is 1:2 to improve the uniformity of pouring flow, and the vertical gate, the horizontal gate and the inner gate are circular, high trapezoidal and square respectively, which are coordinated with each other, effectively solving the phenomenon of shrinkage and shrinkage hole defects in the parts with large thickness of the casting, improving the feeding efficiency of the riser, ensuring the density of the casting, and significantly improving the casting yield.

[0010] Further scroll plate product mold assembly, the center line of the scroll plate mold is parallel to the horizontal plane, avoiding the deviation of molten steel during pouring, and the product material along the center line has high uniformity, thereby improving the service life of the product.

[0011] Further scroll plate product mold assembly, a small riser is provided at the highest part of the scroll plate mold, which can remove the gas inside the cavity during pouring, ensure stable filling, and collect cold water; this design can improve the quality uniformity of the scroll plate.

[0012] A scroll plate product processing technology of the above mold, comprising the following steps:

[0013] The molten iron smelting temperature is 1480-1560℃, and high rare earth inoculant is added during the molten iron smelting process, wherein the rare earth content in the inoculant is greater than 1.5%; a first amount of inoculant is added during the molten iron smelting process;

[0014] After the smelting is completed, the molten iron is transferred to the pouring machine, and a second amount of inoculant is added to the pouring machine during the transfer process; the mass of the second amount of inoculant is 20%-200% of the first amount of inoculant; after the inoculant is completely melted, the pouring temperature is controlled at 1400-1450℃, the pouring speed is controlled at 13-15s, and the pouring is completed in the scroll plate product mold assembly.

[0015] Further processing technology, pouring process, control every bag of molten iron in 15min, more than 15min molten iron back to the furnace.

[0016] Further processing technology, the mass percentage of each component in high rare earth inoculant is: silicon 70-76%, calcium 0.75-1.25%, aluminum 0.75-1.25%, cerium 1.5-2.0%, and the balance is iron.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0019] (1) The vortex stator product mold assembly and the manufacturing method thereof adopt the design that the mold center line is parallel to the horizontal plane, change the layout that the inner gate is connected with the circumference of the vortex stator in the traditional design, and thus effectively solve the phenomenon that the defects such as shrinkage and shrinkage hole occur at the position with large thickness of the casting. This design innovation breaks the traditional idea that the inner gate is arranged at the symmetrical center position, so that the liquid metal is more uniform in the solidification process, the defects caused by non-uniform solidification are reduced, and the quality of the casting is improved.

[0020] (2) The vortex stator product mold assembly and the manufacturing method thereof are provided with a small riser at the top of the mold, which greatly improves the quality of the casting, collects the supercooled metal liquid, ensures the uniformity of the internal organization, and discharges the gas in the cavity during filling, so that the filling is more stable.

[0021] (3) The vortex stator product mold assembly and the manufacturing method thereof improve the quality uniformity of the vortex stator, the flow of the molten iron in the vortex stator mold is more uniform, the quality unevenness caused by local supercooling or overheating is avoided, the performance and service life of the vortex stator product of the present application are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the vortex stator product mold assembly.

[0023] Figure 2 It is a structure schematic view of the vortex stator mold of the specific embodiment.

[0024] In the figure: 1-vortex stator mold; 2- vertical gate; 3-horizontal gate; 4-inner gate; 5-large riser; 6-small riser; 11-center line. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present application, the application is described in detail in combination with the drawings.

[0026] Example 1

[0027] The vortex disc product mold assembly of the embodiment, as shown in Figure 1 The vortex disc product mold assembly of the embodiment, as shown in

[0028] The vortex disc product mold assembly of the embodiment, as shown in

[0029] Embodiment 2

[0030] The vortex disc product mold assembly of the embodiment, as shown in

[0031] The vortex disc product mold assembly of the embodiment, as shown in Figure 2 The vortex disc product mold assembly of the embodiment, as shown in

[0032] The vortex disc product mold assembly of the embodiment, as shown in

[0033] The vortex disc product mold assembly of the embodiment, as shown in

[0034] After the smelting is completed, the molten iron is transferred to the pouring machine, and a second amount of inoculant is added into the pouring machine during the transferring process; the mass of the second amount of inoculant is 110% of the first amount of inoculant; after the inoculant is completely melted, the pouring temperature is controlled at 1430℃, and the pouring speed is controlled at 14s, and the pouring is completed in the vortex disc product mold assembly.

[0035] During the pouring process, the molten iron in each package is used within 15min, and the molten iron exceeding 15min is returned to the furnace.

[0036] The vortex disc product samples are taken for detection, and the results are as follows:

[0037] There is no shrinkage hole and shrinkage in the thin wall part, and the vermiculation rate of the thin wall part, the disc surface and the center position are all greater than 40%.

[0038] Example 3

[0039] The vortex disc product mold assembly and the vortex disc product of the example are different from or improved from the vortex disc product mold assembly and the vortex disc product of example 2 in that,

[0040] The molten iron smelting temperature is 1480℃, and during the molten iron smelting process, a high rare earth inoculant is added, wherein the rare earth content in the inoculant is 1.6%; during the molten iron smelting process, a first amount of inoculant is added, and the addition amount is 0.2% of the mass of the molten iron; the mass percentage of each component in the high rare earth inoculant is silicon 76%, calcium 0.75%, aluminum 1.25%, cerium 1.5%, and the balance is iron.

[0041] After the smelting is completed, the molten iron is transferred to the pouring machine, and a second amount of inoculant is added into the pouring machine during the transferring process; the mass of the second amount of inoculant is 110% of the first amount of inoculant; after the inoculant is completely melted, the pouring temperature is controlled at 1430℃, and the pouring speed is controlled at 14s, and the pouring is completed in the vortex disc product mold assembly.

[0042] The vortex disc product samples are taken for detection, and the results are as follows:

[0043] There is no shrinkage hole and shrinkage in the thin wall part, and the vermiculation rate of the thin wall part, the disc surface and the center position are all greater than 40%.

[0044] Example 4

[0045] The vortex disc product mold assembly and the vortex disc product of the example are different from or improved from the vortex disc product mold assembly and the vortex disc product of example 3 in that,

[0046] The temperature of the molten iron is 1560℃, and during the smelting process of the molten iron, a high-rare earth inoculant is added, wherein the rare earth content in the inoculant is 2.5%; during the smelting process of the molten iron, a first amount of inoculant is added, and the added amount is 0.2% of the mass of the molten iron; the mass percentage of each component in the high-rare earth inoculant is as follows: silicon 70%, calcium 1.25%, aluminum 0.75%, cerium 2.0%, and the balance is iron.

[0047] After the smelting is completed, the molten iron is transferred to a pouring machine, and during the transferring process, a second amount of inoculant is added to the pouring machine; the mass of the second amount of inoculant is 200% of the first amount of inoculant; after the inoculant is completely melted, the pouring temperature is controlled at 1400℃, the pouring speed is controlled at 15s, and the pouring is completed in the vortex disc product mold assembly.

[0048] The vortex disc product sample is taken for detection, and the results are as follows:

[0049] There is no shrinkage and porosity in the thin wall part, and the vermiculation rate of the thin wall part, the disc surface, and the center position is all greater than 40%.

[0050] Comparative example:

[0051] In the comparative example, the vortex disc mold center line 11 is also parallel to the horizontal plane, the cross sections of the sprue 2, the runner 3, and the ingate 4 are all circular, and the ratio of the maximum cross section of the runner 3 to the cross section of the ingate 4 is 1:1. In this case, the casting has shrinkage and porosity defects in the tooth part.

[0052] Through experiments, the casting has fine defects in the thin wall part, and the vermiculation rate of the thin wall part is less than 30% when the inoculant is added only once in the smelting stage.

[0053] The above description is illustrative of the present application and its embodiments, and the description is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure and manufacturing steps are not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the spirit of the present application, similar structural forms and embodiments can be designed without creativity, and all of them should belong to the protection scope of the present application.

Claims

1. A scroll bowl product mold assembly, comprising: The application relates to a vortex disc mold, a vertical gate, a large riser, a horizontal gate, an inner gate and a method for casting vortex disc products. The vortex disc mold is vertically arranged and arranged in a square array. The vertical gate is vertically arranged at the center of the square. The large riser is vertically arranged between the vortex disc molds. The horizontal gate is connected and communicated between the vertical gate and the large riser. The inner gate is connected and communicated between the vortex disc mold and the large riser. The cross-sectional shapes of the vertical gate, the horizontal gate and the inner gate are respectively circular, high trapezoidal and square.

2. The scroll disk product mold assembly of claim 1, wherein: The ratio of the maximum cross section of the horizontal gate to the cross-sectional area of the inner gate is 1:

2.

3. The scroll disk product mold assembly of claim 1, wherein: The center line of the vortex disc mold is parallel to the horizontal plane.

4. The scroll disk product mold assembly of claim 3, wherein: A small riser is arranged at the highest position of the vortex disc mold.

5. A process for machining a product of a scroll base according to any one of claims 1 to 4, characterized in that, The steps are as follows: The temperature of molten iron is 1480-1560 DEG C, and a high-rare earth inoculant is added in the process of smelting the molten iron, wherein the rare earth content in the inoculant is greater than 1.5%; a first amount of inoculant is added in the process of smelting the molten iron; After the smelting is completed, the molten iron is transferred to a pouring machine, and a second amount of inoculant is added into the pouring machine in the process of transferring the molten iron to the pouring machine; the mass of the second amount of inoculant is 20%-200% of the first amount of inoculant; after the inoculant is completely melted, the pouring temperature is controlled to be 1400-1450 DEG C, the pouring speed is controlled to be 13-15 s, and the pouring is completed in the vortex disc product mold assembly.

6. The process of claim 3, wherein: In the pouring process, the molten iron in each package is used within 15 min, and the molten iron exceeding 15 min is returned to the furnace.

7. The process of claim 3, wherein: The mass percentage of each component in the high-rare earth inoculant is as follows: silicon 70-76%, calcium 0.75-1.25%, aluminum 0.75-1.25%, cerium 1.5-2.0%, and the balance is iron.

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