High-strength Anti-shift core body structure of valve body

Abstract

A high-strength anti-shift core body structure of a valve body for casting, said core body structure comprising a main core arbor and a main ceramic tube. The main core arbor at least comprises a first main core arbor and a second main core arbor, the first main core arbor and the second main core arbor being separated from each other. The main ceramic tube comprises a first main ceramic tube sleeved outside the first main core arbor and a second main ceramic tube sleeved outside the second main core arbor; the first main ceramic tube and the second main ceramic tube are connected by means of a transition ceramic tube; and one end of the transition ceramic tube is sleeved on one end of the first main core arbor, and the other end thereof is sleeved on one end of the second main core arbor. The core body structure has high strength and rigidity, and can effectively resist the buoyancy and impact of metal liquid on the core body structure during the casting process, avoiding the core shift phenomenon; and the ceramic tubes avoid sand shedding or loosening, thus effectively improving the quality of castings.

Description

A high-strength anti-drift core structure for valve bodies Technical Field

[0001] This application belongs to the field of casting technology, and in particular relates to a high-strength anti-drift core structure for valve bodies used in casting. Background Technology

[0002] For casting workpieces with through holes, such as valve body castings, a sand core needs to be installed inside the sand mold cavity to form the through hole during the casting process. The sand core is suspended in the cavity. After casting, the sand core is removed or broken, and the corresponding through hole structure is formed in the casting at the position of the sand core. However, because the molten iron exerts buoyancy and impact on the sand core during the casting process, it can cause the sand core to shift or break, resulting in the phenomenon of core floating. This affects the casting accuracy and may even lead to the scrapping of the casting.

[0003] To prevent core drift during casting, a core skeleton is added to the sand core structure to support the sand core and increase its strength, thus solving the problem. However, the added core skeleton makes it difficult to remove after casting, and forceful removal can easily damage the interior of the through-hole in the casting. This is especially true for through-hole structures with bent structures, where the corresponding core skeleton also has a bent structure, making it difficult to remove the core skeleton from the through-hole after casting. Summary of the Invention

[0004] To address the technical problem of existing castings with through-hole structures featuring bending features where the core is difficult to remove from the through-hole, this application provides a high-strength anti-drift core structure for valve bodies.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is a high-strength anti-drift core structure for a valve body, comprising a main core and a main ceramic tube. The main core includes at least a first main core and a second main core, which are separated from each other. The main ceramic tube includes a first main ceramic tube sleeved outside the first main core and a second main ceramic tube sleeved outside the second main core. The first main ceramic tube and the second main ceramic tube are connected by a transition ceramic tube, one end of which is sleeved on one end of the second main core and the other end of which is sleeved on one end of the second main core.

[0006] In some embodiments, the two ends of the transition ceramic tube are respectively inserted and connected to the first main ceramic tube and the second main ceramic tube.

[0007] In some embodiments, the connection between the transition ceramic tube and the first main ceramic tube and the second main ceramic tube is filled and sealed with repair paste.

[0008] In some embodiments, the main core is provided with a plurality of support structures on the outer side supporting the inner wall of the main ceramic tube. The support structure includes a support base connected to the main core and a pad mounted on the support base.

[0009] In some embodiments, the support base is provided with a slide rail arranged axially along the main core at one end away from the main core, the pad is provided with a slide groove matching the slide rail, and a stop block is provided at one end of the support base away from the transition ceramic tube.

[0010] Furthermore, in some embodiments, the support structure near the transition ceramic tube protrudes from the outside of the main ceramic tube, and the pad of the support structure is partially supported on the inner wall of the main ceramic tube and partially supported on the inner wall of the transition ceramic tube.

[0011] In some embodiments, at least one secondary core is provided on one side of the main core, the secondary core is detachably connected to the main core, a secondary ceramic tube is sleeved on the outside of the secondary core, the support structure is also provided between the secondary core and the secondary ceramic tube, the main ceramic tube is provided with a connecting hole at the corresponding position of the secondary core, and the main ceramic tube and the secondary ceramic tube are integrally or detachably connected.

[0012] In some embodiments, when the main ceramic tube and the auxiliary ceramic tube are detachably connected, the connection between the main ceramic tube and the auxiliary ceramic tube is filled and sealed with repair paste.

[0013] In some embodiments, the main core is provided with an interface and the secondary core is provided with a connector. The main core and the secondary core are connected by the interface and the connector. The length of the interface protruding from the main core is not greater than the width of the gap between the main ceramic tube and the main core.

[0014] In some embodiments, the plug interface is provided with a limiting protrusion, and the plug connector is provided with a limiting groove corresponding to the limiting protrusion.

[0015] In some embodiments, the insertion interface is provided with the limiting protrusions in at least two directions, and the line connecting at least two limiting protrusions in each direction is not parallel to that direction.

[0016] Beneficial effects: This invention replaces the original sand core structure with a main ceramic tube sleeved on the outside of the main core. It has high strength and rigidity, and can effectively resist the buoyancy and impact of molten metal on the core structure during the casting process, avoiding the phenomenon of core floating. At the same time, the ceramic tube will not lose sand or become loose, and can withstand high temperature without breaking, which can effectively improve the quality of castings.

[0017] Furthermore, the first and second main cores are separated from each other, with a transition ceramic tube placed between them. This transition ceramic tube is configured as a corresponding through-hole bending structure or other similar structure. This not only effectively forms the bending structure for the through-hole in the casting, but also eliminates the problem of the core being unable to be removed from the bent portion of the through-hole after casting, as there is no core inside the transition ceramic tube. The first and second main cores can be reused, reducing casting costs. Attached Figure Description

[0018] Figure 1 is a cross-sectional view of the valve body casting structure;

[0019] Figure 2 is a partial cross-sectional view of the core structure;

[0020] Figure 3 is an enlarged view of the structure at point A in Figure 2;

[0021] Figure 4 is a schematic diagram of the three-dimensional structure of the first main core;

[0022] Figure 5 is an enlarged view of the structure at point A in Figure 4;

[0023] Figure 6 is a cross-sectional view of the connection structure of the first main core, the secondary core, the main ceramic tube and the secondary ceramic tube;

[0024] Figure 7 is an enlarged view of the structure at point A in Figure 6;

[0025] Figure 8. Schematic diagram of the connection structure between the first main core and the secondary core;

[0026] Figure 9. Schematic diagram of the three-dimensional structure of the connection structure of the first main core, the secondary core, the main ceramic tube and the secondary ceramic tube;

[0027] In the diagram: 100. Casting, 110. Through hole, 120. Branch through hole, 1. Main core, 11. First main core, 12. Second main core, 13. Support seat, 131. Slide rail, 14. Pad, 141. Slide groove, 15. Stop block, 2. Main ceramic tube, 21. First main ceramic tube, 211. Insertion interface, 212. Limiting protrusion, 22. Second main ceramic tube, 3. Transition ceramic tube, 4. Secondary core, 5. Secondary ceramic tube, 6. Positioning block. Detailed Implementation

[0028] The present application will be further described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative changes are within the protection scope of the present application.

[0029] As shown in Figure 1, the valve body casting 100 has multiple through holes 110 along its length. One of the through holes 110 consists of two straight holes and a bent hole between them. The two straight holes are far apart at their adjacent ends, and the bent hole connects them in an S-shape. Due to the shape limitation, using a traditional structure where the core is wrapped inside the sand core will prevent the core from being removed completely, and forceful removal will also damage the inner wall of the through hole 110.

[0030] As shown in Figure 2, in order to solve the above-mentioned technical problems, this application provides a high-strength anti-drift core structure for valve bodies, including a main core rib 1 and a main ceramic tube 2. The main core rib 1 includes at least a first main core rib 11 and a second main core rib 12, which are separated from each other. The main ceramic tube 2 includes a first main ceramic tube 21 sleeved outside the first main core rib 11 and a second main ceramic tube 22 sleeved outside the second main core rib 12. The first main ceramic tube 21 and the second main ceramic tube 22 are connected by a transition ceramic tube 3, one end of which is sleeved on one end of the second main core rib 12, and the other end of which is sleeved on one end of the second main core rib 12.

[0031] As shown in Figure 1, this scheme changes the traditional sand core structure by installing a main ceramic tube 2 on the outside of the main core 1 and combining them to form a new core structure. Taking the core of the casting 100 in Figure 1 as an example, it is provided with a first main core 11 and a second main core 12 that are separated from each other. The first main core 11 and the second main core 12 are basically perpendicular. The first main ceramic tube 21 and the second main ceramic tube 22 are respectively installed on the outside of the first main core 11 and the second main core 12, thus forming the core corresponding to the two straight holes of the casting 100. The first main ceramic tube 21 and the second main ceramic tube 22 are connected by a transition ceramic tube 3. The transition ceramic tube 3 is S-shaped, thus forming the core corresponding to the bent hole section of the casting 100. The two ends of the transition ceramic tube 3 are respectively installed on one end of the first main core 11 and the second main core 12, and are supported by the first main core 11 and the second main core 12. In use, the ends of the first main core rib 11 and the second main core rib 12 furthest from the transition ceramic tube 3 are fixed to the sand mold for positioning, and then the core is installed in the corresponding position in the sand mold cavity. To facilitate positioning and fixing with the sand mold, a positioning block 6 can be set at one end of the first main core rib 11 and the second main core rib 12, and a corresponding positioning and mounting groove can be set on the sand mold. After casting is completed, the first main core rib 11 and the second main core rib 12 can be directly pulled out from the two straight holes of the casting 100. Although the first main ceramic tube 21, the second main ceramic tube 22 and the transition ceramic tube 3 remain in the through hole 110 of the casting 100, they can be broken up and discharged.

[0032] This structure boasts high strength and rigidity, effectively preventing core floating or loosening after impact. The use of ceramic tubes also eliminates sand shedding, thus improving the casting quality of casting 100. The first main core rib 11 and the second main core rib 12 can also smoothly detach from the through hole 110 of casting 100 for reuse.

[0033] To facilitate the connection between the transition ceramic tube 3 and the first main ceramic tube 21 and the second main ceramic tube 22, and to reduce gaps at the connection, the two ends of the transition ceramic tube 3 are respectively inserted into the first main ceramic tube 21 and the second main ceramic tube 22. As shown in Figure 3, specifically, in this embodiment, the outer diameter of the first main ceramic tube 21 and the second main ceramic tube 22 near the transition ceramic tube 3 is reduced to form a stepped plug, while the inner diameter of both ends of the transition ceramic tube 3 is increased to form stepped insertion holes, which fit with the plug to achieve a plug-in connection. This ensures the connection stability of the transition ceramic tube 3 and reduces gaps at the connection.

[0034] To improve the sealing of the connection, in this embodiment, the connection between the transition ceramic tube 3 and the first main ceramic tube 21 and the second main ceramic tube 22 is filled and sealed with repair paste. The repair paste can fill the gap formed at the connection and play a sealing role, preventing molten metal from entering the main ceramic tube 2 through the gap.

[0035] In this embodiment, as shown in Figures 3-5, the main core 1 is externally provided with multiple support structures supporting the inner wall of the main ceramic tube 2. Each support structure includes a support base 13 connected to the main core 1 and a pad 14 mounted on the support base 13. The pad 14 provides support to the inner wall of the main ceramic tube 2. On one hand, the pad 14 can be designed as a contoured structure, with its top surface fitting snugly against the inner wall of the main ceramic tube 2, providing stable support. On the other hand, it isolates the main core 1 from the main ceramic tube 2, reducing the impact of high casting temperatures on the main core 1 and improving its service life. The pad 14 can be made of high-temperature resistant ceramic material.

[0036] To facilitate the insertion and removal of the main core 1 from the main ceramic tube 2, as an improvement, as shown in Figure 5, in this embodiment, the support base 13 is provided with a slide rail 131 arranged axially along the main core 1 at one end away from the main core 1, and the pad 14 is provided with a groove 141 matching the slide rail 131. A stop block 15 is provided at one end of the support base 13 away from the transition ceramic tube 3. During assembly, the pad 14 is installed on the support base 13 via the slide rail 131 and groove 141 structure. Since the slide rail 131 is arranged axially along the main core 1, when the main core 1 is inserted into the main ceramic tube 2 from the end away from the transition ceramic tube 3, friction is generated due to the contact between the pad 14 and the inner wall of the main ceramic tube 2. One end of the pad 14 will move and abut against the stop block 15. The stop block 15 prevents the pad 14 from detaching from the slide rail 131. After insertion, the main ceramic tube 2 is stably fitted onto the outside of the main core 1. When the main core 1 is pulled out of the inner cavity of the main ceramic tube 2 after casting is completed, the main ceramic tube 2 is wrapped by the casting 100. When the main core 1 moves outward, there is friction between the pad 14 and the main ceramic tube 2. If the friction is too large, the pad 14 will not move with the main core 1 and will then detach from the slide rail 131 on the support seat 13. At this time, the main core 1 can be smoothly pulled out of the main ceramic tube 2 and can be reused.

[0037] As shown in Figure 3, in order to facilitate the support of the transition ceramic tube 3, the support structure near the transition ceramic tube 3 protrudes from the outside of the main ceramic tube 2. The pad 14 of the support structure is partially supported on the inner wall of the main ceramic tube 2 and partially supported on the inner wall of the transition ceramic tube 3.

[0038] Some castings 100 have multiple channel structures, as shown in Figure 1. The valve body structure is also connected to two branch through holes 120 on one side of a through hole 110. In order to meet the casting requirements of the branch through holes 120, as shown in Figures 6-9, in this embodiment, at least one secondary core 4 is also provided on one side of the main core 1. The secondary core 4 is detachably connected to the main core 1. The secondary core 4 is fitted with a secondary ceramic tube 5. The support structure is also provided between the secondary core 4 and the secondary ceramic tube 5. The main ceramic tube 2 is provided with a connecting hole at the corresponding position of the secondary core 4. The main ceramic tube 2 and the secondary ceramic tube 5 are integrated or detachably connected. A secondary core rib 4 and a secondary ceramic tube 5 sleeved on the outside of the sand mold cavity are provided at the branch through hole 120 of the casting 100, thereby forming a corresponding cavity structure, as shown in the figure. One end of the secondary core rib 4 is detachably connected to the first main core rib 11, and the other end is positioned on the sand mold by a positioning block 6 (not shown in the figure). This allows the secondary core rib 4 to be connected to the first main core rib 11, improving the overall strength and rigidity of the core structure. It also facilitates the removal of the secondary core rib 4 from the secondary ceramic tube 5 after casting, without affecting the removal of the main core rib 1 from the inside of the main ceramic tube 2. It is preferable to adopt an integrated structure between the main ceramic tube 2 and the secondary ceramic tube 5 to improve the overall structure and reduce connection gaps. However, from a cost perspective, it is simpler to manufacture the main ceramic tube 2 and the secondary ceramic tube 5 independently. The two can be detachably connected by the plug-in structure between the main ceramic tube 2 and the transition ceramic tube 3. When the main ceramic tube 2 and the auxiliary ceramic tube 5 are detachably connected, the connection between the main ceramic tube 2 and the auxiliary ceramic tube 5 is filled and sealed with repair paste to reduce gaps and improve casting quality.

[0039] To achieve a detachable connection between the main core 1 and the secondary core 4, as shown in Figures 7 and 8, in one embodiment, the main core 1 is provided with an interface 211, and the secondary core 4 is provided with a connector. The main core 1 and the secondary core 4 are connected by the interface 211 and the connector, and the length of the interface 211 protruding from the main core 1 is no greater than the width of the gap between the main ceramic tube 2 and the main core 1. As shown, the interface 211 and the connector can effectively connect the two without affecting the fit or separation between the first main core 11 and the main ceramic tube 2.

[0040] As a further improvement, as shown in Figures 7 and 8, in this embodiment, the insertion interface 211 is provided with a limiting protrusion 212, and the connector is provided with a limiting groove corresponding to the limiting protrusion 212. The limiting protrusion 212 and the limiting groove can effectively prevent the connector of the secondary core 4 from being excessively inserted into the insertion interface 211, thus playing a limiting role, and can also prevent the secondary core 4 and the main core 1 from easily separating.

[0041] As shown in Figure 8, this embodiment further optimizes the structure of the limiting groove and the limiting protrusion 212. Specifically, the insertion interface 211 is provided with the limiting protrusion 212 in at least two directions, and the line connecting at least two limiting protrusions 212 in each direction is not parallel to that direction. Providing the limiting protrusion 212 in at least two directions can limit the secondary core 4 in multiple directions. As shown in the figure, the center lines of the four limiting protrusions 212 extend in the vertical direction, that is, parallel to the axis of the first main core 11 (only two are shown in the figure, forming a symmetrical structure with the two not shown limiting protrusions 212). The center lines of the four limiting protrusions 212 extend in the horizontal direction, that is, perpendicular to the axis of the first main core 11 (only two are shown in the figure, forming a symmetrical structure with the two not shown limiting protrusions 212). The four vertically extending limiting protrusions 212 are divided into two groups. The center lines of the two limiting protrusions 212 in each group coincide and pass through the axis of the insertion interface 211. These two groups of limiting protrusions 212 are spaced apart along the axis of the insertion interface 211. Similarly, the four horizontally extending limiting protrusions 212 are also arranged accordingly. By setting the limiting protrusions 212 with a specific distribution structure, the secondary core 4 can be prevented from rotating or shifting within the insertion interface 211, thereby improving the assembly accuracy and the precision of the casting 100.

[0042] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this application.

Claims

1. A high-strength anti-drift core structure for valve bodies, characterized in that, The system includes a main core (1) and a main ceramic tube (2). The main core (1) includes at least a first main core (11) and a second main core (12). The first main core (11) and the second main core (12) are separated from each other. The main ceramic tube (2) includes a first main ceramic tube (21) sleeved outside the first main core (11) and a second main ceramic tube (22) sleeved outside the second main core (12). The first main ceramic tube (21) and the second main ceramic tube (22) are connected by a transition ceramic tube (3). One end of the transition ceramic tube (3) is sleeved on one end of the second main core (12), and the other end is sleeved on one end of the second main core (12).

2. The high-strength anti-drift core structure of the valve body according to claim 1, characterized in that, The two ends of the transition ceramic tube (3) are respectively connected to the first main ceramic tube (21) and the second main ceramic tube (22).

3. The high-strength anti-drift core structure of the valve body according to claim 1 or 2, characterized in that, The connection between the transition ceramic tube (3) and the first main ceramic tube (21) and the second main ceramic tube (22) is filled and sealed with repair paste.

4. The high-strength anti-drift core structure of the valve body according to claim 1, characterized in that, The main core (1) is provided with multiple support structures on the inner wall of the main ceramic tube (2). The support structure includes a support seat (13) connected to the main core (1) and a pad (14) installed on the support seat (13).

5. The high-strength anti-drift core structure of the valve body according to claim 4, characterized in that, The support base (13) is provided with a slide rail (131) arranged along the axial direction of the main core (1) at one end away from the main core (1), and a slide groove (141) matching the slide rail (131) is provided on the pad (14). A stop block (15) is provided at one end of the support base (13) away from the transition ceramic tube (3).

6. The high-strength anti-drift core structure of the valve body according to claim 4 or 5, characterized in that, The support structure near the transition ceramic tube (3) protrudes from the outside of the main ceramic tube (2). The pad (14) of the support structure is partially supported on the inner wall of the main ceramic tube (2) and partially supported on the inner wall of the transition ceramic tube (3).

7. The high-strength anti-drift core structure of the valve body according to claim 4 or 5, characterized in that, At least one secondary core (4) is provided on one side of the main core (1). The secondary core (4) is detachably connected to the main core (1). A secondary ceramic tube (5) is sleeved on the outside of the secondary core (4). The supporting structure is also provided between the secondary core (4) and the secondary ceramic tube (5). The main ceramic tube (2) is provided with a connecting hole at the corresponding position of the secondary core (4). The main ceramic tube (2) and the secondary ceramic tube (5) are integrated or detachably connected.

8. The high-strength anti-drift core structure of the valve body according to claim 7, characterized in that, The main core (1) is provided with a plug interface (211), and the secondary core (4) is provided with a plug connector. The main core (1) and the secondary core (4) are connected by plug interface (211) and plug connector. The length of the plug interface (211) protruding from the main core (1) is not greater than the width of the gap between the main ceramic tube (2) and the main core (1).

9. The high-strength anti-drift core structure of the valve body according to claim 8, characterized in that, The insertion interface (211) is provided with a limiting protrusion (212), and the insertion connector is provided with a limiting groove corresponding to the limiting protrusion (212).

10. The high-strength anti-drift core structure of the valve body according to claim 9, characterized in that, The insertion interface (211) is provided with the limiting protrusions (212) in at least two directions, and the line connecting at least two limiting protrusions (212) in each direction is not parallel to that direction.

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