Filter wheel casting mold
By optimizing the parting surface and gating system design of the casting mold, the defects of filter wheel castings in traditional casting methods were solved, and high-quality and efficient casting production was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN Y&J IND CO LTD
- Filing Date
- 2025-04-11
- Publication Date
- 2026-04-10
AI Technical Summary
Traditional casting methods result in numerous defects such as sand holes, air holes, and slag inclusions when producing large wastewater treatment filter wheel castings. This process is labor-intensive, inefficient, and costly.
A new casting mold design is adopted, including an outer casting mold and a sand core. The process parting surface is located on the upper plane of the filter wheel body. During pouring, the molten steel first fills the annular raised area. Combined with the optimized gating system and riser design, the sequential solidification and purification of the molten steel are achieved.
It significantly reduces defects such as porosity, cracks, deformation, and incomplete pouring in castings, thereby improving product quality and production efficiency.
Smart Images
Figure CN224101775U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a filter wheel casting mould belongs to the casting mould design technical field of stainless steel disc -shaped part. BACKGROUND
[0002] The filter wheel of the rear-end filter device of the large sewage treatment device is disc-shaped flat annular framework structure, adopts austenitic stainless steel material to cast into shape, and the specific structure can be referred to in the prior art Figure 1 and Figure 2 The corresponding filter wheel casting blank includes a filter wheel body with a plurality of filter holes, a hub is arranged at the center of the filter wheel body, and the axial length of the hub extending relative to the upper surface of the filter wheel body is greater than the axial length of the hub extending relative to the lower surface of the filter wheel body, and the hub is provided with a central through hole for connecting with the main shaft of the filter device; the lower surface of the filter wheel body is provided with a plurality of annular protrusions, the annular protrusions are arranged in concentric circles around the axis of the central through hole, and the outer circumferential part of the filter wheel body is provided with an outer ring flange; the upper surface of the filter wheel body is provided with a plurality of framework reinforcing ribs, a single framework reinforcing rib is arranged along the radial direction of the filter wheel body, the inner end of the framework reinforcing rib intersects with the hub, and the outer end of the framework reinforcing rib intersects with the outer ring flange, and the framework reinforcing rib uniformly separates the upper surface of the filter wheel body into a plurality of fan-shaped filter areas. Each fan-shaped filter area has a plurality of groups of filter holes distributed at intervals along the radial direction of the filter wheel body, each group of filter holes is a waist-shaped hole extending along an arc-shaped distribution line, and the arc-shaped distribution line corresponding to the waist-shaped hole is located on a concentric circle with the axis of the central through hole as the center; the number of the groups of filter holes in each fan-shaped filter area located close to the central region of the filter wheel body is one for each group, and the number of the groups of filter holes in each fan-shaped filter area located close to the outer peripheral edge region of the filter wheel body is two for each group, and the two filter holes are separated to form by a separation rib arranged along the radial direction of the filter wheel body.
[0003] Referring to Figure 3 , the traditional molding parting method is to part upward and downward at the lower surface of the filter wheel body (i.e. the root of the annular protrusion), the annular protrusion is upward during pouring (i.e. the casting cavity corresponding to the annular protrusion is located in the upper mold), the inner gate is in the tangential direction of the outer circle of the outer ring flange, after the casting is formed, a large number of sand holes, pores, slag inclusions and other defects exist in the surface of the annular protrusion, the width and other key parts after flaw detection or rough machining, a large amount of defect digging, repair welding, polishing and heat treatment are required to meet the product use requirements, the labor intensity is high, the production efficiency is low, and the production cost is high. UTILITY MODEL CONTENTS
[0004] The utility model aims to provide a filter wheel casting mould, which can effectively improve the quality of the casting blank.
[0005] The utility model discloses a technical scheme that solves its technical problems is: filter wheel foundry mould, the filter wheel casting blank produced including the filter wheel main part with a plurality of filter holes, the central place of filter wheel main part is provided with the wheel hub, and the axial length of wheel hub relative to the upper plane of filter wheel main body extension is greater than its relative to the axial length of lower plane of filter wheel main body extension, and the wheel hub is provided with the central through hole for connecting with filter device main shaft, the lower plane of filter wheel main body is provided with a plurality of annular protrusions, and the annular protrusion is arranged as concentric circle ring around the axis of central through hole, and the outer circumferential part of filter wheel main body is provided with outer ring flange, the upper plane of filter wheel main body is provided with a plurality of skeleton reinforcing bars, and single skeleton reinforcing bar is arranged along the radial extension of filter wheel main body, and the inner end of skeleton reinforcing bar intersects with wheel hub, and the outer end intersects with outer ring flange, and skeleton reinforcing bar evenly divides the upper plane of filter wheel main body into a plurality of sector filter areas, the casting mould includes foundry outer mould and sand core, the foundry outer mould includes outer mould sand type, and the inner mould installation cavity is equipped in outer mould sand type, and the periphery shape of inner mould installation cavity is consistent with the shape of filter wheel casting blank produced, and the shape of sand core is consistent with the shape of cavity structure of filter wheel casting blank produced, and sand core is arranged in the inner mould installation cavity of foundry outer mould, and the casting cavity for producing filter wheel casting blank is formed between foundry outer mould and sand core, the casting mould takes the horizontal plane of filter wheel main body upper plane as the process parting surface between upper die and lower die, and makes the casting cavity corresponding to annular protrusion be located in lower die, so that molten steel fills the area where annular protrusion is located preferentially when pouring.
[0006] Further preferred scheme is that the coaxial iron supplement of cylindrical structure is arranged at the central position of the lower surface of filter wheel main body, the casting mould includes a gating system, and the inner gate of the gating system is tangent to the outer circle of the iron supplement. In this way, the molten steel can be gradually injected into the cavity in a radial and large-flow manner from the inside to the outside, the molten steel can be quickly and smoothly lifted without turbulence and with reduced inclusion of oxidation film into the cavity.
[0007] Further preferred scheme is that the gating system includes a straight gate, a cross gate, a slag collecting blind pipe, a transition gate and an inner gate, the upper end of the straight gate is used for connecting a pouring cup, the lower end of the straight gate is connected to the cross gate, the end of the cross gate is connected to the upwardly extending slag collecting blind pipe, the middle part of the cross gate is connected to the upwardly extending transition gate, the inner gates are symmetrically arranged on the two sides of the transition gate and are connected to the upper end of the transition gate, and the outlets of the inner gates are symmetrically arranged on the two sides of the iron supplement. The outlet end of the inner gate is the inner gate of the gating system. During pouring, the residual sand and impurities in the straight gate and the cross gate are brought into the slag collecting blind pipe by the front end of the molten steel and are stored in the liquid storage end, and the clean molten steel flows into the inner gate through the transition gate, which is beneficial to improving the quality.
[0008] Further preferably, the inner gates of the gating system are flat in structure, and the length direction of the radial section of the inner gates is arranged along the horizontal direction and the width direction is arranged along the vertical direction, which is beneficial to the gradual deceleration injection of the molten steel from the inside to the outside in a radial manner, the fast extrusion casting forming of the molten steel in the cavity, the fast and smooth rising of the molten steel, the reduction of the turbulent flow and the reduction of the inclusion of the oxidation film into the cavity.
[0009] Further preferably, the flow channels corresponding to the straight runners, the cross runners and the transition runners are designed with equal diameters, the flow channel section area of the straight runners is set as S1, the sum of the flow channel section areas of the two inner gates is set as S2, and S2 is not less than 1.6 times of S1, so that the inner gates can play a role in pressure relief and speed reduction, which is beneficial to the slow entering of the molten steel into the cavity and the fast and smooth rising of the molten steel in the cavity.
[0010] Further preferably, a plurality of blind risers are arranged at the positions of the flanges of the outer ring, the lower part of the blind riser is conical, the upper part of the blind riser is hemispherical, a blind riser gas outlet is arranged above the blind riser for the gas in the blind riser, the blind riser is arranged in the area corresponding to the skeleton reinforcement rib of the flange of the outer ring, an open riser is arranged above the hub, the open riser is cylindrical, and is used for the deslagging, degassing and solidification of the molten steel, and the cavity is sequentially solidified along the riser direction to improve the internal quality of the casting.
[0011] Further preferably, a reinforcement rib gas outlet is arranged above the middle position of each skeleton reinforcement rib, which enhances the gas discharge of the casting and has a certain effect of solidification of the molten steel.
[0012] Further preferably, the blind riser gas outlet and the reinforcement rib gas outlet are respectively formed by the positioning and installation of steel pipes, which is convenient for assembly and implementation.
[0013] Further preferably, each sector-shaped filtering area has a plurality of groups of filtering holes distributed along the radial direction of the filtering wheel body, each group of filtering holes is a waist-shaped hole extending along an arc distribution line, and the arc distribution line corresponding to the waist-shaped hole is located on a concentric circle with the axis of the central through hole as the center; the number of groups of filtering holes located near the central region of the filtering wheel body for each sector-shaped filtering area is one, the number of groups of filtering holes located near the peripheral edge region of the filtering wheel body for each sector-shaped filtering area is two, and the two filtering holes are separated by a separation rib arranged along the radial direction of the filtering wheel body; a plurality of chills are arranged on the outer peripheral surface of the outer ring flange, and the chills are arranged in regions corresponding to the separation ribs of the outer ring flange. The heat absorption of the chills can make the molten steel at this position nucleate preferentially before the other positions of the outer ring flange solidify, and the high-temperature molten steel of the blind riser can timely compensate for the reduction of the molten steel around the filtering wheel body, the annular protrusion and the skeleton reinforcing rib position, forming sequential solidification, and the shrinkage porosity and gas hole formed by volume shrinkage are transferred to the riser position.
[0014] Further preferably, an aluminum coating is arranged on the outer surface of the chill, so that the generation of oxidizing gas caused by rust on the surface of the chill during pouring is reduced.
[0015] The casting mold takes the horizontal plane on which the upper surface of the filtering wheel body is located as the process parting surface between the upper mold and the lower mold, and the casting cavity corresponding to the annular protrusion is located in the lower mold, so that the molten steel can fill the region where the annular protrusion is located preferentially during pouring, and the forming quality of the annular protrusion part which is originally prone to solidification defects is greatly improved. In addition, the pouring system of the casting is optimized, the cross gate and the inner gate are designed in layers and cross each other, a slag collecting blind pipe is arranged at the tail end of the cross gate, the cross gate and the inner gate are connected through the transfer gate, the residual sand and impurities in the straight gate and the cross gate are brought into the liquid storage end of the slag collecting blind pipe by the molten steel at the front end during pouring, the clean molten steel flows into the inner gate through the transfer gate, a cylindrical iron supplement which is tangent to the inner gate is additionally arranged below the hub of the casting, the molten steel is injected into the cavity in a radial and large flow rate from inside to outside, the molten steel is quickly and smoothly extruded and formed in the cavity, the molten steel is quickly and smoothly raised without turbulence, the inclusion of the oxidation film into the cavity is reduced, the residual gas of the molten steel rises and flows into the riser system, the chills at the outer ring flange part are additionally arranged, and the high-temperature molten steel of the open riser compensates to realize the preferential solidification of the annular protrusion part of the casting, the skeleton reinforcing rib part is solidified later, the blind riser part is solidified later, the central open riser part is solidified last, the auxiliary casting steel smelting purification effect is achieved, and the sequential solidification can significantly reduce the shrinkage stress of the disc-shaped flat annular casting, effectively solves the casting defects such as porosity, cracks, deformation and insufficient pouring of the filtering wheel casting, and improves the product quality and production efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a perspective view of the filtering wheel according to the present application.
[0017] Figure 2 is Figure 1 a Z-Z sectional view.
[0018] Figure 3 is a schematic view of a parting surface of a casting mold of the prior art.
[0019] Figure 4 is a schematic view of a parting surface of a casting mold of the present application.
[0020] Figure 5 is a front view of a process structure of a casting mold according to the present application; the outer mold sand mold and the sand core are not shown in the figure; it can be understood that the shape of the filter wheel casting blank determines the inner cavity structure of the outer mold sand mold and the shape of the sand core.
[0021] Figure 6 is Figure 5 a top view of the embodiment shown in
[0022] Figure 7 is Figure 5 a three-dimensional view of the embodiment shown in
[0023] Figure 8 is Figure 5 a three-dimensional view of the gating system in the embodiment shown in
[0024] The parts in the figure are marked as follows: filter wheel body 101, filter hole 102, annular protrusion 103, skeleton reinforcing rib 104, wheel hub 105, outer ring flange 106, center through hole 107, partition rib 108; filter wheel casting blank 1, blind riser 2, blind riser gas outlet 3, reinforcing rib gas outlet 4, open riser 5, cold iron 6, gating system 7, iron supplement 8; straight gate 701, cross gate 702, slag collecting blind pipe 703, transition gate 704, inner gate 705, inner gate 706. DETAILED DESCRIPTION
[0025] The present application will be further described below in combination with the accompanying drawings and embodiments.
[0026] Please refer to Figure 1 and Figure 2The filter wheel casting produced by the utility model is completely same as the prior art, and the corresponding filter wheel casting blank 1 comprises a filter wheel main body 101 with a plurality of filter holes 102, a hub 105 is arranged at the center of the filter wheel main body 101, and the axial length of the hub 105 extending relative to the upper plane of the filter wheel main body 101 is greater than the axial length of the hub 105 extending relative to the lower plane of the filter wheel main body 101, and the hub 105 is provided with a central through hole 107 for being connected with a main shaft of a filter device; the lower plane of the filter wheel main body 101 is provided with a plurality of annular protrusions 103, the annular protrusions 103 are arranged in concentric circles around the axis of the central through hole 107, and the outer circumferential part of the filter wheel main body 101 is provided with an outer ring flange 106; the upper plane of the filter wheel main body 101 is provided with a plurality of skeleton reinforcing ribs 104, a single skeleton reinforcing rib 104 is arranged along the radial direction of the filter wheel main body 101, the inner end of the skeleton reinforcing rib 104 intersects with the hub 105, and the outer end of the skeleton reinforcing rib 104 intersects with the outer ring flange 106, the skeleton reinforcing rib 104 uniformly divides the upper plane of the filter wheel main body 101 into a plurality of fan-shaped filter areas, that is, the skeleton reinforcing rib 104 is uniformly and spacedly arranged along the circumferential direction. Each fan-shaped filter area has a plurality of groups of filter holes 102 spacedly distributed along the radial direction of the filter wheel main body 101, each group of filter holes 102 is a waist-shaped hole extending along an arc-shaped distribution line as a whole, and the arc-shaped distribution line corresponding to the waist-shaped hole is located on a concentric circle with the axis of the central through hole 107 as the center; the number of the groups of filter holes 102 in each fan-shaped filter area located close to the central region of the filter wheel main body 101 is one for each group, and the number of the groups of filter holes 102 in each fan-shaped filter area located close to the outer circumferential edge region of the filter wheel main body 101 is two for each group, and the two filter holes 102 are formed by being separated by a separation rib 108 arranged along the radial direction of the filter wheel main body 101. The filter hole coverage area of each fan-shaped filter area in the outer edge region is also longer than that in the inner ring region, and the arrangement of the separation rib 108 can better ensure the overall structural strength of the filter wheel main body 101.
[0027] The main structure of the casting mold can be implemented by referring to the prior art, including a casting outer mold and a sand core; the casting outer mold comprises an outer mold sand type, and the outer mold sand type is provided with an inner mold mounting cavity, the peripheral shape of the inner mold mounting cavity is consistent with the shape of the filter wheel casting blank 1 to be produced, the shape of the sand core is consistent with the shape of the cavity structure of the filter wheel casting blank 1 to be produced, the sand core is arranged in the inner mold mounting cavity of the casting outer mold, and the casting cavity for producing the filter wheel casting blank 1 is formed between the casting outer mold and the sand core. The filter wheel casting blank 1 to be produced has a complex structure, and the hot spot and stress concentration are obvious, so that defects such as looseness, cracks, deformation and insufficient pouring are prone to occur on the product, and the design needs to be optimized in terms of pouring system design, parting surface selection, molding and cavity processing.
[0028] AsFigure 4 As shown, the first key point of this utility model is that the casting mold uses the horizontal plane where the upper surface of the filter wheel body 101 is located as the process parting surface between the upper mold and the lower mold, and makes the casting cavity corresponding to the annular protrusion 103 located in the lower mold, so that the molten steel first fills the area where the annular protrusion 103 is located during pouring.
[0029] like Figures 5 to 8 As shown, in some preferred embodiments, a cylindrical supplementary iron 8 is coaxially arranged at the center of the lower surface of the filter wheel body 101; the casting mold includes a gating system 7, which is located in the casting outer mold, and the inner gate 706 of the gating system 7 is tangent to the outer circle of the supplementary iron 8. The gating system 7 includes a sprue 701 (which, in the usual sense, means a sprue with its axis set vertically), a gating 702 (which, in the usual sense, means a gating with its axis set horizontally), a slag collection blind pipe 703 (with a blind end), a transition gating 704, and an ingate 705. The upper end of the sprue 701 is used to connect to the pouring cup, and the lower end of the sprue 701 is connected to the gating 212. The end of the gating 212 is connected to the upwardly extending slag collection blind pipe 703 (preferably extending vertically upwards), and the middle part of the gating 212 is connected to the upwardly extending transition gating 704 (preferably extending vertically upwards). The ingate 705 is symmetrically arranged on both sides of the transition gating 704 and is connected to the upper end of the transition gating 704. The outlet of the ingate 705 is symmetrically arranged on both sides of the iron supplement 8, and the outlet end of the ingate 705 is the ingate 706 of the gating system 7. It is understandable that the specific connections between the sprue 701, runner 702, slag collection blind pipe 703, transition runner 704, and ingate 705 can be achieved using conventional 90° elbow joints or tee joints. The ingate 706 of the gating system 7 is preferably a flat structure, with its radial cross-section arranged horizontally in the length direction and vertically in the width direction. The ingate 706 is what is commonly known in the art as a duckbill ingate. During casting, residual sand and impurities in the molten steel entering the sprue 701 and sprue 702 are carried by the front-end molten steel into the slag collection blind pipe 703 for storage. The clean molten steel overflows into the ingate 705 through the transition gating 704. The molten steel can fill the casting cavity steadily at a low speed and high flow rate within a specified time. The molten steel has less oxide film and slag inclusion, maintaining the purity of the metallurgical composition. It can effectively solve casting defects such as slag inclusion, porosity, cracks, deformation, and insufficient pouring in filter wheel castings.
[0030] In some preferred embodiments, the runner corresponding to the sprue 701, the runner 702 and the transition runner 704 adopt an equal diameter design, the cross-sectional area of the runner of the sprue 701 is set as S1, the sum of the cross-sectional areas of the runners of the two ingates 705 is set as S2, S2 is not less than 1.6 times of S1, so as to facilitate the pressure relief and speed reduction. The specific parameters of S1 and S2 can be reasonably designed by those skilled in the art according to the actual situation, for example, they can be designed to meet the requirements that the molten steel completes the mold pouring within 20 to 25 seconds, and the outlet flow rate of the molten steel of the runner 702 is less than 0.3 m / s, so as to achieve the slow entering of the molten steel into the cavity at a large flow rate and the rapid and smooth rising of the molten steel in the cavity.
[0031] In some preferred embodiments, a plurality of blind risers 2 are arranged at the position where the outer ring flange 106 is located, the lower part of the blind riser 2 is in the shape of a circular truncated cone, the upper part of the blind riser 2 is in the shape of a hemisphere, a blind riser gas outlet 3 is arranged above the blind riser 2 for the removal of gas in the blind riser 2, the blind riser 2 is arranged in the area corresponding to the skeleton reinforcing rib 104 connected to the outer ring flange 106, an open riser 5 is arranged in the upper area of the hub main body 105, the open riser 5 is in the shape of a cylinder, and is used for slag collection, gas removal and steel solidification shrinkage during the filling of the cavity with molten steel. A reinforcing rib gas outlet 4 is arranged in the upper area of the middle position of each skeleton reinforcing rib 104, which enhances the gas removal of the casting and has a certain shrinkage effect on the skeleton reinforcing rib 104 during the solidification of the molten steel. The blind riser gas outlet 3 and the reinforcing rib gas outlet 4 are respectively formed by a steel pipe arranged in position. Correspondingly, the blind riser gas outlet 3 and the area where the reinforcing rib gas outlet is located are respectively provided with a gas outlet molding positioning device for accurately installing the steel pipe for gas removal during molding.
[0032] A plurality of chills 6 are arranged on the outer circumferential surface of the outer ring flange 106, the chills 6 are arranged in the area corresponding to the partition rib 108 of the outer ring flange 106, so that the molten steel at this position solidifies earlier than the position of the skeleton reinforcing rib 104, and the high-temperature molten steel of the blind riser timely supplements the molten steel of the thick part of the casting, and the shrinkage porosity and gas holes formed by volume shrinkage are transferred to the riser position. The outer surface of the chill 6 is provided with an aluminum coating (which can be realized by using a conventional spraying process), so as to reduce the generation of gas during pouring.
[0033] In addition, during the molding of the filter wheel casting, the cavity of the casting is preferably molded by using alkali phenolic resin sand, chromite sand is preferentially used at the hot spot corresponding to the annular protrusion 103, and soft mold stripping is adopted at the same time. At this time, the sand has a certain elasticity, has good mold stripping performance, and the sand does not adhere to the mold, so that the cavity is clean and complete.
[0034] The pouring is realized by using splash-proof pouring cup, controlling the flow of liquid steel by adjusting the opening of the ladle outlet, maintaining the liquid level of the liquid pool in the pouring cup, and making the liquid steel enter the cross sprue 702 through the straight sprue 701, and the front end liquid steel can carry the residual sand and impurities in the straight sprue 701 and the cross sprue 702 into the blind end of the slag collecting blind pipe 703 to be reserved, and the clean liquid steel flows into the two inner sprues 705 through the vertically arranged transition sprue 704, and then enters the iron supplement 8 through the two inner gates 706, and then rises into the cavity, and then diffuses and flows in the area of the annular protrusion 103 along the radial outward direction of the cavity, until the liquid steel overflows and fills the low heat riser to be lower than the upper end of the riser by 10mm to 20mm, and then the riser is pointed and filled with the covering agent to complete the pouring.
[0035] The utility model discloses a filter wheel casting pouring gate and large flow pouring system design are optimized and design, realize large flow fast extrusion casting forming, liquid steel fast and steady rise, no turbulence, oxidation film, inclusion and gas steady rise overflow enter the riser system, and cold iron auxiliary setting and riser high temperature liquid steel supplement can produce remarkable sequential solidification effect, and the effective purification of casting liquid steel, and the sphericalization dispersion treatment of inclusion form. Can significantly reduce the shrinkage stress of pouring system to casting, effectively solve the loose, crack, deformation, pouring deficiency and other casting defects of filter wheel casting, improve product quality and production efficiency.
Claims
1. A filter wheel casting mold, a filter wheel casting blank (1) produced by the filter wheel casting mold comprises a filter wheel body (101) having a plurality of filter holes (102), a hub (105) is arranged at the center of the filter wheel body (101), and the axial length of the hub (105) extending relative to the upper plane of the filter wheel body (101) is greater than the axial length of the hub (105) extending relative to the lower plane of the filter wheel body (101), and the hub (105) is provided with a central through hole (107) for connecting with a main shaft of a filter device; the lower plane of the filter wheel body (101) is provided with a plurality of annular protrusions (103), the annular protrusions (103) are arranged in concentric circles around the axis of the central through hole (107), and the outer circumferential part of the filter wheel body (101) is provided with an outer ring flange (106); the upper plane of the filter wheel body (101) is provided with a plurality of skeleton reinforcing ribs (104), a single skeleton reinforcing rib (104) is arranged along the radial direction of the filter wheel body (101), the inner end of the skeleton reinforcing rib (104) intersects with the hub (105), and the outer end of the skeleton reinforcing rib (104) intersects with the outer ring flange (106), the skeleton reinforcing rib (104) uniformly divides the upper plane of the filter wheel body (101) into a plurality of fan-shaped filter areas; the casting mold comprises a casting outer mold and a sand core; the casting outer mold comprises an outer mold sand type, and an inner mold mounting cavity is arranged in the outer mold sand type, the shape of the periphery of the inner mold mounting cavity is consistent with the shape of the filter wheel casting blank (1) to be produced, the shape of the sand core is consistent with the shape of the cavity structure of the filter wheel casting blank (1) to be produced, the sand core is arranged in the inner mold mounting cavity of the casting outer mold, and a casting cavity for producing the filter wheel casting blank (1) is formed between the casting outer mold and the sand core, characterized in that: The casting mold takes the horizontal plane where the upper surface of the filter wheel body (101) is located as the process parting surface between the upper mold and the lower mold, and makes the casting cavity corresponding to the annular protrusion (103) located in the lower mold.
2. The filter wheel casting mold of claim 1, wherein: A cylindrical iron supplement (8) is coaxially arranged at the center position of the lower surface of the filter wheel body (101); the casting mold comprises a gating system (7), the gating system (7) is located in the outer mold, and the inner gate (706) of the gating system (7) is tangent to the outer circle of the iron supplement (8).
3. The filter wheel casting mold of claim 2, wherein: The gating system (7) comprises a straight gate (701), a cross gate (702), a slag collecting blind pipe (703), a transition gate (704) and inner gates (705), the upper end of the straight gate (701) is used for connecting a sprue cup, the lower end of the straight gate (701) is connected with the cross gate (702), the tail end of the cross gate (702) is connected with the upwardly extending slag collecting blind pipe (703), the middle part of the cross gate (702) is connected with the upwardly extending transition gate (704), the inner gates (705) are symmetrically arranged on both sides of the transition gate (704) and are in communication with the upper end of the transition gate (704), and the outlets of the inner gates (705) are symmetrically arranged on both sides of the iron supplement (8), and the outlet end of the inner gate (705) is the inner gate (706) of the gating system (7).
4. The filter wheel casting mold of claim 3, wherein: The inner gate (706) of the gating system (7) is of a flat structure, and the length direction of the radial cross section of the inner gate (706) is arranged along the horizontal direction, and the width direction is arranged along the vertical direction.
5. The filter wheel casting mold of claim 3, wherein: The flow channels corresponding to the straight gate (701), the cross gate (702) and the transition gate (704) are designed to be equal in diameter, the flow channel cross-sectional area of the straight gate (701) is set as S1, the sum of the flow channel cross-sectional areas of the two inner gates (705) is set as S2, and S2 is not less than 1.6 times of S1.
6. The filter wheel casting mold of claim 3, wherein: A plurality of blind risers (2) are arranged at the position of the outer ring flange (106), the lower part of the blind riser (2) is conical, the upper part of the blind riser (2) is hemispherical, a blind riser gas outlet (3) is arranged above the blind riser (2), the blind riser (2) is arranged in the region corresponding to the skeleton reinforcing rib (104) connected with the outer ring flange (106), and an open riser (5) is arranged in the upper region of the hub (105), and the open riser (5) is cylindrical.
7. The filter wheel casting mold of claim 6, wherein: A reinforcing rib gas outlet (4) is arranged above the middle position of each skeleton reinforcing rib (104).
8. The filter wheel casting mold of claim 7, wherein: The blind riser gas outlet (3) and the reinforcing rib gas outlet (4) are respectively formed by positioning and installing steel pipes.
9. The filter wheel casting mold of claim 3, wherein: Each fan-shaped filtering area has a plurality of groups of filtering holes (102) distributed along the radial direction of the filtering wheel body (101), each group of filtering holes (102) is a waist-shaped hole extending along an arc distribution line, and the arc distribution line corresponding to the waist-shaped hole is located on a concentric circle with the axis of the central through hole (107) as the center; the number of groups of filtering holes (102) near the central area of the filtering wheel body (101) is one for each fan-shaped filtering area, the number of groups of filtering holes (102) near the outer peripheral edge area of the filtering wheel body (101) is two for each fan-shaped filtering area, and the two filtering holes (102) are separated by a separation rib (108) arranged along the radial direction of the filtering wheel body (101); a plurality of chills (6) are arranged on the outer peripheral surface of the outer ring flange (106), and the chills (6) are arranged in regions corresponding to the separation ribs (108) of the outer ring flange (106).
10. The filter wheel casting mold of claim 9, wherein: An outer surface of the chill (6) is provided with an aluminum coating.