Die for sand casting of duplex stainless steel double-suction closed impeller

Abstract

The utility model relates to a mold for sand casting of a duplex stainless steel double-suction closed impeller, which comprises an outer mold and a core box and is structurally characterized in that an upper mold outer mold is fixedly connected with a lower mold outer mold, and an upper mold round core head is arranged above the upper mold outer mold; an open riser is fixedly connected to the upper mold outer mold, and a parting surface core head is arranged above the lower mold outer mold; a lower mold round core head is arranged below the lower mold outer mold, and a blind riser is arranged on the outer side of the lower mold outer mold; the core box comprises a 1 # core box, a 2 # core box and a 3 # core box, the 1 # core box and the 2 # core box are blade integral core boxes, and the 3 # core box is of a falling-off type structure. The device is simple in structure, light in weight, easy to operate and high in adaptability, saves cost, and completely meets the production requirements of existing actual products.

Description

Technical Field

[0001] The utility model relates to a casting mould, in particular to a duplex stainless steel double-suction closed impeller sand casting mould. Background Art

[0002] Due to the special structure and material of duplex stainless steel double-suction closed impeller products, they have strong corrosion resistance and wear resistance in the operating environment and stable operation. Their special blade twist ensures the pump head and flow rate, and are in high demand in the water pump field.

[0003] However, due to the small size of the product, the maximum outer diameter is 500mm, the blade twist is small, the wrap angle is 110 degrees, the blade and cover plate are thin, the thickness is 8mm, the material is special, the size and internal quality requirements are strict, and batch production is required. For its special material, cracks are easy to occur, which increases the complexity of the process, resulting in a complex mold structure, cumbersome modeling process, and increased production costs, which is not conducive to batch production. Therefore, the casting difficulty is higher than that of general products, and there are often cases of unqualified product dimensions, cracks and other casting defects. Utility Model Content

[0004] In view of the problems existing in the above-mentioned actual production process, the utility model provides a duplex stainless steel double-suction closed impeller sand casting mold, which ensures the accuracy of the size and the internal quality requirements of the duplex stainless steel double-suction closed impeller in the actual production process. Moreover, the utility model has a simple structure, is easy to operate, has strong adaptability and saves costs.

[0005] The technical solution of this utility model is as follows:

[0006] A mold for sand casting of a duplex stainless steel double-suction closed impeller, comprising an outer mold and a core box, wherein the outer mold comprises an upper outer mold, a lower outer mold, an upper round core head, a lower round core head, a parting surface core head, a blind riser and an exposed riser;

[0007] The upper outer mold is connected and fixed with the lower outer mold, the upper round core head is arranged above the upper outer mold and is an integrated structure with the upper outer mold, and the upper round core head is used to position the 2# lower core; the upper outer mold is connected and fixed with an exposed riser, a parting surface core head is arranged above the lower outer mold, and the parting surface core head is used to position the 1# lower core and the 2# lower core; a lower round core head is arranged below the lower outer mold, and the lower round core head is used to position the 1# lower core; a hidden riser is arranged on the outer side of the lower outer mold, and the lower outer mold, the lower round core head, the parting surface core head, and the hidden riser are an integrated structure;

[0008] The core box comprises 1# core box, 2# core box and 3# core box. 1# core box and 2# core box are integral core boxes of blades, and 3# core box is a detachable structure.

[0009] The outer mold and core box are made according to the process size and are made of wooden multilayer boards.

[0010] The upper outer mold and the lower outer mold are connected and fixed by positioning stoppers.

[0011] The blind risers are evenly spaced and provided with four.

[0012] The open risers include waist-shaped risers and cylindrical risers. There are four waist-shaped risers, which are evenly spaced and arranged outside the cylindrical risers.

[0013] The 1# core box and 2# core box are scraper structures, including a main body, a base plate, blades, a retaining ring and a scraper; the main body and the base plate are an integrated structure, the blades and the retaining ring are installed on the base plate, the retaining ring is arranged on the outside of the blade, and the scraper is arranged above the blade and is sleeved on the outside of the main body.

[0014] The outer wall of the scraper is evenly spaced with four holes for convenient sand-squeezing, each hole is equipped with a claw plate for convenient cooperation and fixation with a retaining ring, and the top of each claw plate is connected to a tie rod for fastening, and the tie rod is provided with holes for reducing weight.

[0015] The bottom plate is provided with retaining ring positioning holes and blade positioning holes, the retaining ring and the blade are provided with retaining ring positioning pins and blade positioning pins respectively, and four handrails are provided at the two side ends of the bottom plate.

[0016] The blades of the 1# core box and the 2# core box rotate in different directions.

[0017] The 3# core box comprises a base, a movable block and a positioning stop, and the movable block is connected and fixed to the base through the positioning stop.

[0018] The advantages and effects of the present invention are as follows:

[0019] 1. The outer mold and core box are made according to the process size, and the material is wooden multilayer board, with stable and durable structure and high dimensional accuracy.

[0020] 2. The upper outer mold and the lower outer mold are connected and fixed by positioning stoppers to ensure the overall appearance size of the model.

[0021] 3. There are 4 blind risers, which are an integral structure with the lower mold outer mold, thus avoiding the need for separate boxes and simplifying the operation process.

[0022] 4. The positioning stop is a connecting device between the structures, which facilitates the connection, fixation and shaping between the structures.

[0023] 5. The 1# core box and 2# core box are integral core boxes of the blades and are scraper structures, which are convenient for sanding and molding, and effectively ensure the dimensional accuracy of the blades.

[0024] 6. The blade core is an integral core structure, and the core head positioning method is adopted to effectively ensure the streamline and dimensional accuracy of the blade.

[0025] 7. The design of blind riser can effectively solve the problem of casting product defects caused by thin thickness of blades and cover plates.

[0026] 8. The utility model has a simple structure, light weight, easy operation, strong adaptability, cost saving, and fully meets the needs of existing product production. After the various parts are combined, it can effectively ensure that the dimensions of each part of the mold are consistent with the design value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the outer mold structure of the utility model.

[0028] Figure 2 This is a structural schematic diagram of the 1# core box of the utility model.

[0029] Figure 3 This is a schematic diagram of the bottom plate structure of the 1# core box of the utility model.

[0030] Figure 4 This is a schematic structural diagram of the 2# core box of the utility model.

[0031] Figure 5 It is a schematic diagram of the bottom plate structure of the 1# core box and the 2# core box of the utility model.

[0032] Figure 6 This is a schematic diagram of the structure of the 3# core box of the utility model.

[0033] In the figure, 1. upper outer mold, 2. lower outer mold, 3. upper round core head, 4. lower round core head, 5. parting surface core head, 6. blind riser, 7. waist-shaped riser, 8. cylindrical riser, 9. main body, 10. retaining ring, 11. scraper, 12. blade, 13. handrail, 14. retaining ring positioning hole, 15. blade positioning hole, 16. base, 17. movable block, 18. bottom plate. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with specific embodiments with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1-4 As shown, a duplex stainless steel double-suction closed impeller sand casting mold comprises an outer mold and a core box, wherein the outer mold comprises an upper outer mold 1, a lower outer mold 2, an upper round core head 3, a lower round core head 4, a parting surface core head 5, a concealed riser 6 and an exposed riser;

[0037] The upper outer mold 1 is connected and fixed with the lower outer mold 2 through a positioning stopper, the upper round core head 3 is arranged above the upper outer mold 1 and is an integrated structure with the upper outer mold, and the upper round core head 3 is used to position the 2# lower core; the upper outer mold 1 is connected and fixed with an open riser through a positioning stopper, a parting surface core head 5 is arranged above the lower outer mold 2, and the parting surface core head is used to position the 1# lower core and the 2# lower core; a lower round core head 4 is arranged below the lower outer mold 2, and the lower round core head is used to position the 1# lower core; a hidden riser 6 is arranged on the outer side of the lower outer mold 2, and the lower outer mold 2 and the lower round core head 4, the parting surface core head 5, and the hidden riser 6 are an integral structure.

[0038] The blind risers are evenly spaced and provided with four; the visible risers include a waist-shaped riser 7 and a cylindrical riser 8, and there are four waist-shaped risers, which are evenly spaced and arranged outside the cylindrical riser.

[0039] The core box comprises 1# core box, 2# core box and 3# core box. 1# core box and 2# core box are integral core boxes of blades, and 3# core box is a detachable structure.

[0040] The 1# core box and 2# core box are scraper structures, including a main body 9, a bottom plate 18, blades 12, a retaining ring 10 and a scraper 11; the main body 9 and the bottom plate 18 are an integrated structure, and four handrails 13 are provided at the two side ends of the bottom plate, and the main body 9 and the handrails 13 are an integrated structure; a retaining ring positioning hole 14 and a blade positioning hole 15 are opened on the bottom plate 18, and a retaining ring positioning pin and a blade positioning pin are correspondingly provided on the retaining ring and the blade, and the blade 12 and the retaining ring 10 are installed on the bottom plate 18 through the positioning pin holes, the retaining ring 10 is arranged on the outside of the blade, and the scraper 11 is arranged above the blade 12 and is sleeved on the outside of the main body 9.

[0041] The blades 12 of the 1# core box and the 2# core box rotate in different directions.

[0042] The outer wall of the scraper is evenly spaced with four holes for convenient sand-squeezing, each hole is equipped with a claw plate for convenient cooperation and fixation with a retaining ring, and the top of each claw plate is connected to a tie rod for fastening, and the tie rod is provided with holes for reducing weight.

[0043] The 3# core box comprises a base 16, a movable block 17 and a positioning stop, and the movable block is connected and fixed to the base through the positioning stop.

[0044] The outer mold and core box are made according to the process size and are made of wooden multilayer boards.

[0045] The working process of the utility model is as follows:

[0046] Step 1: If Figure 1-4 , place the assembled outer mold and core box on the modeling platform.

[0047] Step 2: Put a sand box of suitable size on the outside of the outer mold, fill it with self-hardening resin sand, tamp it, and scrape it flat. Place the core iron and exhaust rope in the core box, fill the core box with self-hardening resin sand, tamp it, and scrape it flat.

[0048] Step 3: Let the molding sand stand for a while and wait for chemical hardening.

[0049] Step 4: External mold forming, select a reasonable demoulding direction according to the parting surface of the external mold. Remove the core box block, turn the core box over, and form the core box.

[0050] The utility model is particularly suitable for the casting molding process of duplex stainless steel double-suction closed impellers with small size, small blade distortion, thin blade and cover plate thickness, special material, strict size and internal quality requirements, and batch production.

[0051] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" 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 invention rather than requiring the present invention to be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense, for example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component; for ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] The above are specific embodiments of the present invention and the technical principles used. Any equivalent changes based on the scheme of the present invention are within the protection scope of the present invention.

Claims

1. A duplex stainless steel double-suction closed impeller sand casting mold, including an outer mold and a core box, characterized in that The outer mold includes an upper outer mold, a lower outer mold, an upper round core head, a lower round core head, a parting surface core head, a blind riser and an exposed riser; The upper outer mold is connected and fixed with the lower outer mold, the upper round core head is arranged above the upper outer mold and is an integrated structure with the upper outer mold, and the upper round core head is used to position the 2# lower core; the upper outer mold is connected and fixed with an exposed riser, a parting surface core head is arranged above the lower outer mold, and the parting surface core head is used to position the 1# lower core and the 2# lower core; a lower round core head is arranged below the lower outer mold, and the lower round core head is used to position the 1# lower core; a hidden riser is arranged on the outer side of the lower outer mold, and the lower outer mold, the lower round core head, the parting surface core head, and the hidden riser are an integrated structure; The core box comprises 1# core box, 2# core box and 3# core box. 1# core box and 2# core box are integral core boxes of blades, and 3# core box is a detachable structure.

2. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The outer mold and core box are made according to the process size and are made of wooden multilayer boards.

3. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The upper outer mold and the lower outer mold are connected and fixed by positioning stoppers.

4. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The blind risers are evenly spaced and provided with four.

5. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The open risers include waist-shaped risers and cylindrical risers. There are four waist-shaped risers, which are evenly spaced and arranged outside the cylindrical risers.

6. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The 1# core box and 2# core box are scraper structures, including a main body, a base plate, blades, a retaining ring and a scraper; the main body and the base plate are an integrated structure, the blades and the retaining ring are installed on the base plate, the retaining ring is arranged on the outside of the blade, and the scraper is arranged above the blade and is sleeved on the outside of the main body.

7. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 6, characterized in that The outer wall of the scraper is evenly spaced with four holes for convenient sand-squeezing, each hole is equipped with a claw plate for convenient cooperation and fixation with a retaining ring, and the top of each claw plate is connected to a tie rod for fastening, and the tie rod is provided with holes for reducing weight.

8. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 6, characterized in that The bottom plate is provided with retaining ring positioning holes and blade positioning holes, the retaining ring and the blade are provided with retaining ring positioning pins and blade positioning pins respectively, and four handrails are provided at the two side ends of the bottom plate.

9. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 6, characterized in that The blades of the 1# core box and the 2# core box rotate in different directions.

10. The duplex stainless steel double-suction closed impeller sand casting mold according to claim 1, characterized in that The 3# core box comprises a base, a movable block and a positioning stop, and the movable block is connected and fixed to the base through the positioning stop.

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