Integral casting forming die for nodular cast iron flanged pipe fitting

Abstract

The utility model relates to the technical field of casting equipment, and discloses a nodular cast iron flanged pipe fitting integral casting forming die which comprises a lower die and an upper die, a plurality of first lug seats are fixedly connected to the front side and the rear side of the lower die, pull rods are rotationally connected into the first lug seats, and a plurality of second lug seats are fixedly connected to the front side and the rear side of the upper die. The second lug seat is movably connected with a sliding plate through a cover plate, one side of the cover plate is fixedly connected with an inner screw hole seat, the inner screw hole seat is in threaded connection with an adjusting screw rod, the front side and the rear side of the sliding plate are fixedly connected with a plurality of side plates, and the side plates are fixedly connected with inserting blocks. By means of matching of the forming cavity and the model with the flange, integrated casting forming of the pipe fitting and the flange is achieved, the step of welding after traditional independent casting is omitted, the defects of uneven wall thickness, out-of-tolerance in shape and position size, shrinkage porosity and shrinkage cavity and the like can be overcome for the flange pipe fitting with the small caliber and the large length-diameter ratio, and the product percent of pass is remarkably increased.

Description

Technical Field

[0001] This utility model relates to the field of casting equipment technology, and in particular to a mold for integral casting of ductile iron flange pipe fittings. Background Technology

[0002] Ductile iron flange pipe is a type of pipe component that is made by spheroidizing ordinary cast iron pipe, so that the graphite in the cast iron is spherical. Its main body is made of ductile iron and flanges are installed at both ends.

[0003] Currently, the forming of ductile iron flanges mainly involves two steps: first, the pipe body is made, and then the flange is processed. First, the ductile iron raw material is melted, and spheroidizing agents and inoculants are added to make the graphite spherical. Then, the pipe body prototype is cast using centrifugal casting or sand casting. For example, the existing Chinese utility model patent with publication number CN220739418U: Cast Iron Pipe Processing and Forming Mold. Before adding the forming mold material, the length of the internal forming chamber can be adjusted by driving the electric push rod to slide the movable push plate to the left, so as to process and form cast iron pipes of different lengths, thereby completing the production of the pipe body. However, the connection between the pipe body and the flange of traditional flange fittings is mostly produced by casting separately and then welding the flange. Therefore, there are problems such as low strength at the flange connection, poor sealing, and easy leakage. Especially for flange fittings with small diameter and large length-to-diameter ratio, the pass rate of traditional casting method is low, and defects such as uneven wall thickness, out-of-tolerance shape and position, shrinkage porosity and shrinkage cavities are likely to occur.

[0004] Furthermore, in the production of some existing pipe fittings, sand casting molds are used for casting because they are low-cost, quick to make, and can be adapted to the production of multiple specifications of pipe fittings. In order to prevent the mold from being blown open by the impact of molten iron during casting and to avoid problems such as iron leakage and casting size deviation, the upper and lower molds of the sand casting mold must be fixed with several threaded fasteners. However, this method has obvious disadvantages. Assembly and disassembly require tightening bolts one by one, which is particularly time-consuming and affects production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a mold for integral casting of ductile iron flange pipe fittings, so as to realize the integral casting of pipe and flange, avoid welding defects, improve the strength and sealing of the connection, reduce the defect rate of small diameter and large length-to-diameter ratio pipe fittings, and realize the convenience of mold closing and opening operation, reduce assembly and disassembly time, improve production efficiency, and effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A ductile iron flange pipe fitting integral casting mold includes a lower mold and an upper mold. Several first lugs are fixedly connected to the front and rear sides of the lower mold, and a pull rod is rotatably connected within each first lug. Several second lugs are fixedly connected to the front and rear sides of the upper mold. A sliding plate is movably connected to each second lug via a cover plate. An internal threaded hole seat is fixedly connected to one side of the cover plate, and an adjusting screw is internally threaded into the internal threaded hole seat. Several side plates are fixedly connected to the front and rear sides of the sliding plate, and insert blocks are fixedly connected to the side plates. A forming cavity is formed in both the lower and upper molds. A sprue is also formed on the front side of both the lower and upper molds, and the sprue communicates with the forming cavity. A sealing block is inserted between two sprues.

[0008] As a further preferred embodiment of this utility model, a number of positioning blocks are fixedly connected to the lower mold, and a number of positioning grooves are opened at the lower end of the upper mold. The positioning blocks are interlocked with one of the positioning grooves for positioning connection between the lower mold and the upper mold.

[0009] As a further preferred embodiment of this utility model, a slot is provided at the end of the pull rod away from the first ear seat. The top of the slot has a sloping structure and a limiting groove. When the lower end of the pull rod rotates in the first ear seat and maintains a perpendicular posture with the lower mold and the upper mold, the lower mold and the upper mold can be closed and fixed at multiple points by means of inserting a plug into the pull rod.

[0010] As a further preferred embodiment of this utility model, a fixed seat is fixedly connected to one side of the slide plate, and a slot is provided in the fixed seat. After the fixed seat is connected to one end of the adjusting screw, the slide plate can be moved horizontally on the upper mold by means of the adjusting screw. The slide plate located in front of and behind the fixed seat is provided with mounting through slots.

[0011] As a further preferred embodiment of this utility model, the top side of the insert block has a sloping structure and is fixedly connected to a limiting block. After the insert block is inserted into the slot of one of the pull rods through the sloping surface on the top side, the pull rod can be lifted up, and the limiting block can be inserted into the limiting groove to prevent the pull rod from separating from the insert block under force, thereby realizing the quick mold closing or mold opening operation of the lower mold and the upper mold.

[0012] As a further preferred embodiment of this utility model, the front and rear sides of the cover plate are fixedly connected with bent fixing spokes. The bent fixing spokes pass through one of the mounting slots and are fixedly connected to the upper mold, thereby limiting the slide plate on the upper mold and allowing the slide plate to move horizontally on the upper mold. One end of the adjusting screw is fixedly connected to a locking block. The locking block is a columnar structure and is rotatably connected in the locking slot. The end of the adjusting screw away from the locking block is inserted and connected to an operating handle. After manually rotating the adjusting screw through the operating handle, the locking block can be used to push and pull the slide plate by rotating the adjusting screw in the inner screw hole seat.

[0013] As a further preferred embodiment of this utility model, a model is inserted and connected in the two molding cavities. The model is a pipe fitting model with a flange. With the cooperation of the two molding cavities, the pipe and flange can be cast and formed as a whole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In this utility model, by using the molding cavity and the model with flange, the pipe fitting and flange are cast as a whole, eliminating the traditional step of separate casting and welding. For flange pipe fittings with small diameter and large length-to-diameter ratio, it can avoid defects such as uneven wall thickness, out-of-tolerance shape and position dimensions, and shrinkage porosity, and significantly improve the product qualification rate.

[0016] 2. In this utility model, by cooperating with components such as the first ear seat, pull rod, second ear seat, slide plate, and adjusting screw, the operation handle can drive the adjusting screw to move the slide plate, so that the insert block is inserted into the slot of the pull rod. With the cooperation of the limiting block and the limiting groove, multi-point fixing can be quickly completed without tightening bolts one by one. This enables the upper mold and lower mold to be quickly closed and opened, greatly reducing the assembly and disassembly time and avoiding the labor-intensive problem of traditional threaded fasteners. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the disassembled structure of the main body of this utility model;

[0019] Figure 3 This is a schematic diagram of the forming state of the pipe fitting of this utility model;

[0020] Figure 4 This is a schematic diagram of the disassembled structure of the upper mold, cover plate, and slide plate of this utility model;

[0021] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 6 for Figure 2Enlarged view of point B in the middle.

[0023] In the diagram: 1. Lower mold; 2. Upper mold; 3. First ear seat; 4. Pull rod; 5. Second ear seat; 6. Cover plate; 7. Slide plate; 8. Internal threaded hole seat; 9. Adjusting screw; 10. Side plate; 11. Insert block; 12. Molding cavity; 13. Mold; 14. Sprue; 15. Sealing block; 16. Positioning block; 17. Positioning groove; 18. Slot; 19. Limiting groove; 20. Fixing seat; 21. Slot; 22. Mounting through groove; 23. Limiting block; 24. Bending and fixing spoke plate; 25. Locking block; 26. Operating handle. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figures 1-6 As shown, the present invention provides a ductile iron flange pipe fitting integral casting forming mold, including a lower mold 1 and an upper mold 2. Several first ear seats 3 are fixedly connected to the front and rear sides of the lower mold 1. A pull rod 4 is rotatably connected inside the first ear seat 3. Several second ear seats 5 are fixedly connected to the front and rear sides of the upper mold 2. A sliding plate 7 is movably connected to the second ear seat 5 through a cover plate 6. An internal threaded hole seat 8 is fixedly connected to one side of the cover plate 6. An adjusting screw 9 is internally threaded to the internal threaded hole seat 8. Several side plates 10 are fixedly connected to the front and rear sides of the sliding plate 7. An insert block 11 is fixedly connected to the side plate 10. A forming cavity 12 is opened in the lower mold 1 and the upper mold 2 respectively. A sprue 14 is also opened on the front side of the lower mold 1 and the upper mold 2 respectively. The sprue 14 communicates with the cavity 12. A sealing block 15 is inserted between the two sprues 14.

[0026] like Figures 1-2 As shown, several positioning blocks 16 are fixedly connected to the lower mold 1, and several positioning grooves 17 are opened at the lower end of the upper mold 2. The positioning blocks 16 and one of the positioning grooves 17 are interlocked and connected to each other for positioning connection between the lower mold 1 and the upper mold 2.

[0027] like Figures 2-6As shown, a slot 18 is provided at the end of the pull rod 4 away from the first ear seat 3. The top of the slot 18 has a sloping structure and a limiting groove 19. When the lower end of the pull rod 4 rotates in the first ear seat 3 and maintains a vertical posture with the lower mold 1 and the upper mold 2, the lower mold 1 and the upper mold 2 can be closed and fixed at multiple points by inserting the insert block 11 into the pull rod 4. A fixing seat 20 is fixedly connected to one side of the slide plate 7. A slot 21 is provided in the fixing seat 20. After the fixing seat 20 is connected to one end of the adjusting screw 9, the slide plate 7 can be moved horizontally on the upper mold 2 by adjusting the screw 9. The slide plate 7 located in front of and behind the fixing seat 20 has a mounting through groove 22. The top side of the insert block 11 has a sloping structure and a limiting block 23 is fixedly connected. After the insert block 11 is inserted into the slot 18 of one of the pull rods 4 through the sloping top side, the pull rod 4 can be lifted, and the limiting block 23 can be inserted into the limiting groove 19 to prevent When the tension rod 4 and the insert block 11 are subjected to force, they detach, thereby enabling the rapid mold closing or opening and closing operations of the lower mold 1 and the upper mold 2. The front and rear sides of the cover plate 6 are fixedly connected with bent fixing spokes 24. The bent fixing spokes 24 pass through one of the mounting slots 22 and are fixedly connected to the upper mold 2, thereby limiting the slide plate 7 on the upper mold 2, so that the slide plate 7 can move horizontally on the upper mold 2. One end of the adjusting screw 9 is fixedly connected with a locking block 25. The locking block 25 is a columnar structure and is rotatably connected in the locking groove 21. The end of the adjusting screw 9 away from the locking block 25 is inserted and connected with an operating handle 26. After manually rotating the adjusting screw 9 through the operating handle 26, the locking block 25 can be pushed and pulled by the fixing seat 20 by rotating the adjusting screw 9 in the inner thread hole seat 8. The two forming cavities 12 are connected with a model 13. The model 13 is a pipe fitting model with a flange. With the two forming cavities 12, the pipe and flange can be cast and formed as a whole.

[0028] It should be noted that this utility model is a mold for integral casting of ductile iron flange pipe fittings. Before casting, a model 13 with flanges is made according to the process requirements. That is, pre-expanded polystyrene beads are injected into the molding mold, and the beads are fused by steam heating and then cooled to form model 13. This realizes the integral molding of model 13 with flange holes and straight pipes. Then, a certain thickness of refractory material is uniformly coated on the surface of the foam model 13 and dried to prevent the casting from sticking to sand, ensure the structural stability of model 13, and ensure the smooth discharge of decomposition gases. Subsequently, the model 13 coated with refractory coating is buried in dry sand, and the filling and compaction of molding sand is achieved by vibration to meet the requirements of molten iron filling.

[0029] After model 13 is prepared, it is placed in the molding cavity 12 of the lower mold 1. Then, the positioning block 16 and positioning groove 17 are aligned, and the upper mold 2 is placed on the lower mold 1 to complete the initial mold closing and positioning installation. Next, the pull rod 4 in the first ear seat 3 on the lower mold 1 is rotated to a position perpendicular to the upper and lower molds 1, and the upper end of the pull rod 4 is inserted into the corresponding second ear seat 5. The pull rod 4 is magnetically attracted to the second ear seat 5 on one side to adjust the posture of the second ear seat 5. Then, the operating handle 26 is held and the adjusting screw 9 is rotated. The adjusting screw 9 rotates in the inner threaded hole seat 8, and the locking block 25 rotates in the locking groove 21 of the fixed seat 20, thereby pulling the slide plate 7. The slide plate 7 moves along the bending fixed... The limiting horizontal movement of the fixed spoke plate 24 can drive several sets of driving side plates 10 and insert blocks 11 to move together. The slope of the top of the insert block 11 will slide into the slope of the slot 18 of the pull rod 4, which can lift the pull rod 4. The limiting block 23 on the insert block 11 will be locked into the limiting groove 19 of the pull rod 4. In this way, the upper mold 2 and the lower mold 1 are firmly fixed at multiple points to prevent the mold from loosening during casting. Then, during casting, the gate 14 is opened and the molten ductile iron metal is injected into the forming cavity 12 through the gate 14. In the early stage, the flow is slow and thin to prevent sand washing. In the middle stage, the rapid pouring ensures that the pipe is filled within the specified time. In the later stage, the pouring is slow and thin to prevent overflow. The molten metal will fill the space around the forming cavity 12 and the mold 13.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A ductile iron flanged pipe integral casting forming mold characterized by: Including lower mould (1) with upper mould (2), the lower mould (1) front side and rear side are fixedly connected with a plurality of first ear seat (3), the first ear seat (3) is rotatably connected with pull rod (4), the upper mould (2) front side and rear side are fixedly connected with a plurality of second ear seat (5), the second ear seat (5) is movably connected with slide plate (7) through cover plate (6), the cover plate (6) one side is fixedly connected with internal screw hole seat (8), the internal screw hole seat (8) is threadedly connected with adjusting screw rod (9), the slide plate (7) front side and rear side are fixedly connected with a plurality of side plates (10), the side plate (10) is fixedly connected with plug block (11), the lower mould (1) and upper mould (2) are respectively provided with forming cavity (12), the lower mould (1) and upper mould (2) front side are respectively provided with water gap (14), the water gap (14) is communicated with the cavity of forming cavity (12), and the sealing block (15) is connected between the two water gap (14).

2. The ductile iron flange fitting integral casting forming mold according to claim 1, characterized in that: The lower mould (1) is fixedly connected with a plurality of positioning blocks (16), and the upper mould (2) is provided with a plurality of positioning grooves (17) at the lower end, and the positioning block (16) and one of the positioning grooves (17) are connected with each other.

3. The integral molding die for a nodular cast iron flanged pipe fitting according to claim 1, characterized in that: The pull rod (4) is provided with an insertion slot (18) at one end away from the first ear seat (3), and the top of the insertion slot (18) is a slope and is provided with a limiting groove (19).

4. The ductile iron flanged pipe integral casting forming mold according to claim 3, characterized in that: The slide plate (7) one side is fixedly connected with fixed seat (20), the fixed seat (20) is provided with clamping groove (21), and the slide plate (7) is provided with mounting through slot (22) at the front side and rear side of the fixed seat (20).

5. The ductile iron flanged pipe integral molding mold according to claim 4, characterized in that: The top of the plug block (11) one side is a slope structure and is fixedly connected with a limiting block (23).

6. The ductile iron flanged pipe integral molding mold according to claim 4, characterized in that: The cover plate (6) front side and rear side are fixedly connected with bending fixed spoke (24), the bending fixed spoke (24) is fixedly connected on the upper mould (2) through one of the mounting through slots (22), one end of the adjusting screw rod (9) is fixedly connected with a clamping block (25), the clamping block (25) is a columnar structure and is rotatably connected in the clamping groove (21), and the end of the adjusting screw rod (9) away from the clamping block (25) is connected with operating handle (26).

7. The ductile iron flanged pipe integral molding mold according to claim 1, characterized in that: Two forming cavities (12) are connected with a model (13).

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