A side core-pulling mold for casting a long tubular cavity casting and a casting mold

Abstract

A long tubular cavity casting side core-pulling mold, including side core-pulling one and side core-pulling two, which are movably connected, one end of the side core-pulling one is connected with the left core mold integrally, the upper end face of the other end is concave with a groove, the left end of the groove is closed, the right end extends to the right end face of the side core-pulling one to form an opening, the closed end of the groove is a semicircular structure, the opening of the groove is gradually tightened inward at both ends, the opening width is less than the diameter of the semicircular closed end, the side core-pulling two has a protrusion at one end, which is matched with the groove, when the groove and the protrusion are closed, the side core-pulling one and the side core-pulling two are connected to form a detachable conical platform, the diameter gradually decreases from the leftmost side of the side core-pulling one to the rightmost side of the side core-pulling two, the other end of the left core mold is fixed with the left mold connecting plate through a connecting column. Improve production efficiency and production yield.

Description

Technical Field

[0001] This invention belongs to the field of casting mold technology, specifically a side core-pulling mold and casting mold for casting long tubular cavity castings. Background Technology

[0002] When producing tubular cavity castings with long internal holes, a side core-pulling mold is required between the upper and lower molds to form the cavity. After casting is completed, the core placed inside the cavity must be removed to allow the casting to be easily demolded for reuse.

[0003] In existing technologies, after the casting of tubular cavities is completed, a hydraulic cylinder is typically used to remove the side core mold so that the inner core can be directly pulled out for demolding after casting. However, when the tubular cavity is long, and the length of the side core mold far exceeds the stroke of the hydraulic cylinder, the side core mold cannot be completely removed from the casting, resulting in the casting being unable to be produced normally. Therefore, for castings with long tubular cavities, sand cores are generally used to form the inner cavity of the casting. However, using sand cores also has the following problems: First, it increases production costs. Using sand cores requires the manufacture of core boxes, core-making coated sand, core-making personnel, heating electricity, core-making equipment, sand-cleaning equipment and personnel, etc. When sand cleaning is inconvenient, the casting must be heated together to remove the sand from the casting. Second, casting defects such as surface roughness, porosity, and shrinkage cavities are easily generated inside the casting, and the repair of defects on the inner surface is inconvenient, which may lead to the problem of having to scrap the casting. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a side core-pulling mold and casting mold for casting long tubular cavity castings, thereby improving production efficiency and yield.

[0005] A side core-pulling mold for casting long tubular cavity castings includes two side core-pulling molds that are movably connected to each other. One end of the side core-pulling mold is integrated with the left core mold, and the upper surface of the other end has a recessed groove. The left end of the groove is closed, and the right end extends to the right end face of the side core-pulling mold to form an opening. The closed end of the groove has a semi-circular structure. The two ends of the opening of the groove gradually tighten inward to form an anti-detachment groove with an opening width smaller than the diameter of the semi-circular closed end. One end of the side core-pulling mold has a protrusion that fits into the groove. When the groove and the protrusion are closed, the side core-pulling mold and the side core-pulling mold are connected to form a detachable truncated cone. The diameter gradually decreases from the leftmost side of the side core-pulling mold to the rightmost side of the side core-pulling mold. The other end of the left core mold is fixed to the left mold connecting plate via a connecting post.

[0006] A core-pulling drive component is connected to one side of the left mold connecting plate.

[0007] The core-pulling drive component is a hydraulic cylinder.

[0008] A casting mold for a long tubular cavity casting includes a lower mold, an upper mold, a right side mold, a front side mold, a rear side mold, and a side core-pulling mold as described above. After the lower mold, upper mold, right side mold, front side mold, rear side mold, and side core-pulling mold are closed, a forming cavity for the casting is formed inside. The upper mold is fixed to the upper mold connecting plate by a connecting column. An ejector assembly is provided between the upper mold and the upper mold connecting plate. A side core-pulling mold is provided on both the front and rear sides of the upper mold. The two side core-pulling molds are diagonally arranged. The side core-pulling mold extends into the upper mold and extends to the forming cavity, and a small side mold for forming the casting is provided at its end.

[0009] The side pull rod is connected to the gravity draft hammer.

[0010] The ejector assembly includes an ejector plate and multiple ejector rods. The upper end of the ejector rod is fixed to the ejector plate, and the lower end passes through the upper mold and extends into the molding cavity. A guide rod is connected to the upper mold, and a guide sleeve is fitted over the guide rod. The guide sleeve is fixed in the corresponding mounting hole on the ejector plate.

[0011] The top plate is also provided with a reset rod, which passes through the upper mold and is directly opposite the non-forming cavity on the upper end face of the lower mold.

[0012] Compared with existing technologies, this invention can produce castings with an inner cavity length exceeding the cylinder stroke without using sand cores. Using this invention eliminates the need for sand core fabrication and post-casting sand core removal, improving production efficiency. Components produced using this invention have a smooth appearance, eliminating shrinkage cavities (looseness) in castings caused by slow sand core cooling, reducing porosity caused by sand core gas generation, and improving product quality. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the invention casting mold;

[0014] Figure 2 for Figure 1 Top view;

[0015] Figure 3 for Figure 1 Sectional view along axis AA;

[0016] Figure 4 for Figure 1 Front view;

[0017] Figure 5 for Figure 4 BB-direction sectional view;

[0018] Figure 6 for Figure 1 The left view;

[0019] Figure 7 This is a diagram of the side-drawing structure;

[0020] Figure 8A partial view of the invention's casting mold;

[0021] Figure 9 for Figure 8 Top view;

[0022] Figure 10 This is a schematic diagram of the side core-pulling mold of the present invention;

[0023] Figure 11 This is a schematic diagram of the structure of the side core-pulling method;

[0024] Figure 12 for Figure 11 Top view;

[0025] Figure 13 This is a schematic diagram of the structure of the second side core puller. Detailed Implementation

[0026] like Figure 8-13 As shown, the side core-pulling mold for casting long tubular cavity castings provided in this embodiment of the invention includes a first side core-pulling mold 3 and a second side core-pulling mold 4. One end of the first side core-pulling mold 3 is connected to the left core mold 6 as a whole, and the other end of the left core mold 6 is fixed to the left mold connecting plate 5 via a connecting post. A core-pulling driving component is connected to one side of the left mold connecting plate 5. The other end of the first side core-pulling mold 3 has a recessed groove 7 with an opening at the right end. The left closed end of the groove 7 has a semi-circular structure, and the center line of the semi-circle is perpendicular to the axis of the first side core-pulling mold 3. The two ends of the opening of the groove 7 gradually tighten inward to form an anti-detachment groove with an opening width smaller than the diameter of the semi-circular shape at the closed end. One end of the second side core-pulling mold 4 has a protrusion 14 that fits into the groove 7. When the groove 7 and the protrusion 14 are closed, the first side core-pulling mold 3 and the second side core-pulling mold 4 are connected to form a truncated cone. The diameter of the truncated cone gradually decreases from the leftmost side of the first side core-pulling mold 3 to the rightmost side of the second side core-pulling mold 4.

[0027] Furthermore, the core-pulling drive component is a hydraulic cylinder.

[0028] like Figure 1-6As shown, this embodiment of the invention also provides a casting mold for a long tubular cavity casting, comprising a lower mold 1, an upper mold 8, a right side mold 15, a front side mold 28, a rear side mold 24, and a side core-pulling mold as described above. After the lower mold 1, upper mold 8, right side mold 15, front side mold 28, rear side mold 24, and side core-pulling mold are closed, a forming cavity for the casting is formed inside. The right side mold 15, front side mold 28, rear side mold 24, and side core-pulling mold are all driven to close by a driving component (hydraulic cylinder) on a mold closing machine. The upper mold 8 is fixed to the upper mold connecting plate 10 via connecting pillar 9. The upper mold connecting plate 10 is connected to the upper hydraulic cylinder of the mold closing machine. An ejector assembly is provided between the upper mold 8 and the upper mold connecting plate 10. The ejector assembly includes an ejector plate 13, a reset rod 2, and multiple ejector rods 23. The upper end of the ejector rod 23 is fixed to the ejector plate 13, and the lower end passes through the upper mold 8 and extends into the molding cavity. The upper end of the reset rod 2 is fixed to the ejector plate 13, and the lower end passes through the upper mold 8 and faces the upper surface of the lower mold, which is not in the molding cavity. A guide rod 12 is connected to the upper mold 8. The guide rod 12 is covered with a guide sleeve, which is fixed in the corresponding mounting hole on the ejector plate 13. The ejector plate 13 is pushed down by the ejector hydraulic cylinder on the mold closing machine. When the mold is closed, the ejector plate 13 does not contact the telescopic rod of the ejector hydraulic cylinder. After the mold is opened, the top of the telescopic rod of the ejector hydraulic cylinder contacts the ejector plate 13.

[0029] like Figure 1 , Figure 7 A side pull-out 19 is provided on both the front and rear sides of the upper mold. The side pull-out 19 is connected to the gravity drafting hammer 21 via a tie rod. The two side pull-out 19 are arranged diagonally. The side pull-out 19 extends into the upper mold 8 and extends to the forming cavity, and a small side mold 24 for forming the part to be cast is provided at its end.

[0030] During production, after the lower mold 1, upper mold 8, right side mold 15, front side mold 28, rear side mold 24, and side core-pulling molds are closed, the reset rod abuts against the upper end of the lower mold 1, causing the ejector plate 13 to reset. At this time, the top of the ejector rod 23 is flush with the upper end of the forming cavity, and casting is carried out from the pouring gate at the bottom of the lower mold 1. After the low-pressure casting of the casting is completed, the right side mold 15, front side mold 28, and rear side mold 24 open. The driving component (cylinder) drives the left mold connecting plate 5, left core mold 6, and two side core-pulling molds to move to the left. After the driving component (cylinder) is in position, the first side core-pulling mold 3 completely detaches from the casting. Although the second side core-pulling mold 4 is separated from the casting, it is not completely outside the casting. Then, the upper cylinder of the mold closing machine drives the upper mold to move upward. After reaching the specified height, the ejector cylinder of the mold closing machine moves downward to apply force to the ejector rod pressure plate, separating the casting from the upper mold through the ejector rod. At this time, the second side core-pulling mold 4 is still inside the casting. After removing the casting from the center of the mold and taking it outside the equipment, the second side core puller 4 is removed from the casting and assembled with the first side core puller 3 before the next mold production can continue.

Claims

1. A side core-pulling mold for casting long tubular hollow castings, characterized in that: The device includes two side core pullers (3 and 4) that are movably connected to each other. One end of the side core puller (3) is connected to the left core mold (6) as a whole, and the upper surface of the other end has a groove (7) recessed. The left end of the groove (7) is closed and the right end extends to the right end face of the side core puller (3) to form an opening. The closed end of the groove (7) is a semi-circular structure. The two ends of the opening of the groove (7) gradually tighten inward to form an anti-detachment groove with an opening width smaller than the semi-circular diameter of the closed end. One end of the side core puller (4) has a protrusion (14) that fits into the groove (7). When the groove (7) and the protrusion (14) are closed, the side core puller (3) and the side core puller (4) are connected to form a detachable truncated cone. The diameter gradually decreases from the leftmost side of the side core puller (3) to the rightmost side of the side core puller (4). The other end of the left core mold (6) is fixed to the left mold connecting plate (5) via a connecting post.

2. The side core-pulling mold for casting long tubular hollow castings according to claim 1, characterized in that: A core-pulling drive component is connected to one side of the left mold connecting plate (5).

3. The side core-pulling mold for casting long tubular hollow castings according to claim 1, characterized in that: The core-pulling drive component is a hydraulic cylinder.

4. A casting mold for a long tubular hollow casting, characterized in that: The mold includes a lower mold (1), an upper mold (8), a right side mold (15), a front side mold (28), a rear side mold (24), and a side core-pulling mold as described in any one of claims 1-3. After the lower mold (1), upper mold (8), right side mold (15), front side mold (28), rear side mold (24), and side core-pulling mold are closed, a forming cavity for the part to be cast is formed inside. The upper mold (8) is fixed to the upper mold connecting plate (10) by a connecting column (9). An ejector assembly is provided between the upper mold (8) and the upper mold connecting plate (10). A side pull (19) is provided on both the front and rear sides of the upper mold. The two side pulls (19) are diagonally arranged. The side pull (19) extends into the upper mold (8) and extends to the forming cavity, and a small side mold (24) for forming the part to be cast is provided at its end.

5. A casting mold for a long tubular hollow casting according to claim 4, characterized in that: The side pull (19) is connected to the gravity draft hammer (21) via a tie rod.

6. A casting mold for a long tubular hollow casting according to claim 4, characterized in that: The top material assembly includes a top material plate (13) and multiple top material rods (23). The upper end of the top material rod (23) is fixed to the top material plate (13), and the lower end passes through the upper mold (8) and extends into the molding cavity. A guide rod (12) is connected to the upper mold (8). A guide sleeve is fitted over the guide rod (12), and the guide sleeve is fixed in the corresponding mounting hole on the top material plate (13).

7. A casting mold for a long tubular hollow casting according to claim 6, characterized in that: The top plate (13) is also provided with a reset rod, which passes through the upper mold (8) and is directly opposite the non-forming cavity on the upper end face of the lower mold.

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