In-mold inoculation block
By setting a rectangular frustum-shaped block on the inner wall of the direct pouring hole of the sand mold and using insertion holes, insertion posts or threaded connections, the problem of the inoculation block floating on the surface of the molten iron and affecting melting was solved, and the uniform melting and synchronous inoculation effect of the inoculation block was achieved, thus improving the quality of the casting.
Patent Information
- Application Number
- CN202422602280.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-10-25
AI Technical Summary
Existing inoculation blocks tend to float on the surface of molten iron during casting, affecting melting and reducing the inoculation effect.
Design a rectangular frustum-shaped block that is placed on the inner wall of the direct casting hole of the sand mold and connected to the insert through a hole, insert, or thread to ensure full contact between the molten iron and the block. Use an adhesive layer or snap-fit groove to enhance the connection stability and ensure that the block and the insert are not easily separated.
This method achieves uniform melting of the inoculum blocks, improves the inoculation effect, avoids incomplete melting, ensures that the inoculum blocks and the casting process are synchronized, and improves the quality of the castings.
Smart Images
Figure CN223603423U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of casting, in particular to an in-mold inoculation block. BACKGROUND
[0002] When casting thick-section nodular graphite castings, an inoculation block is needed to perform in-mold inoculation on the castings.
[0003] The existing inoculation block is generally in the form of small particles. During casting, the worker first places the inoculation block into the cavity of the sand mold, and then pours the high-temperature molten iron directly into the cavity of the sand mold, so that the molten iron can melt the inoculation block, thereby achieving in-mold inoculation on the castings in the sand mold.
[0004] However, since the density of the molten iron is much greater than that of the inoculation block, when the cavity of the sand mold is filled with the molten iron, the inoculation block will float on the surface of the molten iron, thereby affecting the dissolution of the inoculation block and reducing the inoculation effect of the inoculation block on the molten iron.
[0005] Therefore, there is a need to provide an in-mold inoculation block. CONTENT OF THE INVENTION
[0006] In order to solve the problem that the existing inoculation block will float on the surface of the molten iron, thereby affecting the dissolution of the inoculation block and reducing the inoculation effect of the inoculation block on the molten iron, the present application provides an in-mold inoculation block.
[0007] The present application provides an in-mold inoculation block, which adopts the following technical solution: a block body is arranged on the inner wall of a straight sprue hole.
[0008] By adopting the above technical solution, the block body is arranged on the inner wall of the straight sprue hole, so that the molten iron flowing from the straight sprue hole to the cavity will flow through the block body, thereby ensuring that the molten iron around the block body always maintains a high temperature, so that the in-mold inoculation block is less likely to appear incomplete dissolution; and the dissolution process of the inoculation block is synchronized with the casting process, so as to ensure good inoculation effect on the molten iron in the sand mold.
[0009] Specifically, the block body is in the shape of a rectangular platform.
[0010] By adopting the above technical solution, the contact area between the block body in the shape of a rectangular platform and the molten iron is large, so that the heat transfer and solute diffusion speed between the molten iron and the in-mold inoculation block are faster, thereby achieving uniform dissolution of the inoculation block.
[0011] Further, the length ratio between the long side of the bottom surface, the short side of the bottom surface, the long side of the top surface, and the short side of the top surface of the rectangular platform is 4:2:2:1.
[0012] By adopting the technical scheme, the length ratio between the long side of the bottom surface, the short side of the bottom surface, the long side of the top surface and the short side of the top surface of the oblong table shape makes the long side bottom surface angle and the short side bottom surface angle of the oblong table shape not equal in size, and then makes the melting speed of the long side of the block and the short side of the block not equal, so as to improve the melting speed of the in-mold inoculation block, and achieve the effect of fully melting the inoculation block as a whole.
[0013] Further, the length ratio between the height and the long side of the bottom surface of the oblong table shape is between 0.37 and 0.46.
[0014] By adopting the technical scheme, according to the above ratio, the included angle between the side surface and the bottom surface of the oblong table shape is small, so as to generate an edge angle effect that is beneficial to the melting of the in-mold inoculation block, and the problems of slow melting speed of the inoculation block in the early casting stage and inoculation lag are avoided.
[0015] Specifically, the bottom surface of the block is provided with a insertion hole, and the inner wall of the straight sprue is provided with a insertion column, and the block can be sleeved on the insertion column through the insertion hole and connected with the insertion column.
[0016] By adopting the technical scheme, the block can be connected with the inner wall of the straight sprue through the cooperation of the insertion column and the insertion hole.
[0017] Further, the inner wall of the insertion hole is provided with a adhesive layer, and the block can be bonded with the column body of the insertion column through the adhesive layer.
[0018] By adopting the technical scheme, the block can be bonded with the column body of the insertion column through the adhesive layer.
[0019] Further, the inner wall of the insertion hole is provided with a clamping groove, and the column body of the insertion column is provided with a clamping protrusion, when the insertion hole is sleeved on the insertion column, the clamping protrusion can extend into the clamping groove and abut against the groove wall of the clamping groove close to the insertion hole.
[0020] By adopting the technical scheme, the block can be clamped on the column body of the insertion column through the cooperation of the clamping protrusion and the clamping groove, so that the block and the insertion column are not easy to separate due to the failure of the adhesive layer at high temperature, thereby the connection between the block and the insertion column is not easy to fail.
[0021] Further, the inner wall of the insertion hole is provided with an internal thread, and the insertion column is provided with an external thread matched with the internal thread, and the block can be connected with the insertion column through the screw connection of the internal thread and the external thread.
[0022] By adopting the above technical solution, the block can be connected to the post body of the insert through the cooperation of internal and external threads, so that the connection between the block and the insert is not easy to separate due to the melting of the jamming protrusion, thereby further reducing the probability of connection failure between the block and the insert.
[0023] In summary, this application includes the following beneficial technical effects:
[0024] The sand mold includes a block and a cavity inside. The cavity wall has a sprue for injecting molten iron into the cavity. The block is placed on the inner wall of the sprue so that the molten iron flowing from the sprue into the cavity flows through the block, thereby ensuring that the molten iron around the block always maintains a high temperature. This makes it less likely for the inoculated block inside the mold to be incompletely melted. The melting process of the inoculated block is carried out simultaneously with the casting process to ensure a good inoculation effect on the molten iron inside the sand mold. Attached Figure Description
[0025] Figure 1 This is a schematic cross-sectional view taken along the central axis of the sprue hole on the sand mold in the vertical direction, according to the first embodiment of this application, wherein only a portion of the sprue hole is shown.
[0026] Figure 2 yes Figure 1 A schematic enlarged view of region A, showing the adhesive layer;
[0027] Figure 3 This is a schematic cross-sectional view taken along the central axis extending vertically along the direct casting hole on the sand mold, according to a second embodiment of this application, where only a portion of the direct casting hole is shown.
[0028] Figure 4 yes Figure 3 A schematic enlarged view of region B, showing the snap-fit protrusion;
[0029] Figure 5 This is a perspective view of the insert post in the second embodiment of this application;
[0030] Figure 6 This is a schematic cross-sectional view taken along the central axis of the vertically extending direct casting hole on the sand mold, according to the third embodiment of this application, where only a portion of the direct casting hole is shown.
[0031] Figure 7 yes Figure 6 A schematic enlarged view of region C, showing a socket with internal threads drilled by a drill bit;
[0032] Figure 8is a schematic sectional view of the third embodiment of the present application along the vertical direction of the middle axis of the straight sprue of the sand mold, wherein only part of the sand mold is shown, so as to show a bushing with an internal thread opened by tapping.
[0033] Reference signs: 1, sand mold; 11, straight sprue; 111, plug post; 1111, clamping protrusion; 112, buffer groove; 2, block; 21, bottom surface; 211, bushing; 2111, adhesive layer; 2113, internal thread; 22, top surface. DETAILED DESCRIPTION
[0034] Figure 1 is a schematic sectional view of the first embodiment of the present application along the vertical direction of the middle axis of the straight sprue of the sand mold, wherein only part of the straight sprue is shown, Figure 2 is Figure 1 is a schematic enlarged view of the middle A area, wherein the adhesive layer is shown. See Figure 1 and Figure 2 In the first embodiment, the present application provides an in-mold inoculation block for use in a sand mold 1 for casting thick-sectioned ductile iron castings. The sand mold 1 is internally provided with a mold cavity (not shown in the figure) adapted to the ductile iron casting, and a straight sprue 11 is formed in the top wall of the mold cavity and leads to the top of the sand mold 1. The inner wall of the straight sprue 11 is provided with a buffer groove 112, and three plug posts 111 are arranged in the buffer groove 112 at intervals. The bottom surface 21 of the in-mold inoculation block is provided with a bushing 211, and the inner wall of the bushing 211 is provided with an adhesive layer 2111. The adhesive used in the adhesive layer 2111 can be composed of styrene-butadiene rubber, industrial paraffin, and solvent gasoline, so that the in-mold inoculation block can be bonded to the shaft of the plug post 111 by sleeving the bushing 211 on the plug post 111, and then the molten iron flowing from the straight sprue 11 into the mold cavity will first flow into the buffer groove 112 and soak the in-mold inoculation block, so that the molten iron around the in-mold inoculation block can always maintain a high temperature, thereby preventing the in-mold inoculation block from not being completely dissolved. The dissolution process of the in-mold inoculation block is synchronized with the casting process of the castings, so as to ensure that the in-mold inoculation block has good inoculation effect on the molten iron in the sand mold 1.
[0035] See Figure 1 and Figure 2The block body 2 of the in-mold inoculation block is a rectangular platform shape, and the length ratio between the long side of the bottom surface 21, the short side of the bottom surface 21, the long side of the top surface 22 and the short side of the top surface 22 is 4:2:2:1, so that the long side bottom surface 21 angle and the short side bottom surface 21 angle of the rectangular platform shape are not equal in size, and then the melting speed of one side of the long side and one side of the short side of the block body 2 is not equal, so as to improve the melting speed of the in-mold inoculation block, and achieve the effect of fully melting the inoculation block as a whole; and the length ratio between the height of the rectangular platform shape and the long side of the bottom surface 21 is between 0.37-0.46, according to the ratio, the angle between the side surface of the rectangular platform shape and the bottom surface 21 is small, so as to generate an edge effect beneficial to the melting of the in-mold inoculation block (that is, the edge between the side surface of the in-mold inoculation block and the bottom surface 21 will melt earlier than the main body of the in-mold inoculation block), avoiding the problem that the melting speed of the inoculation block is slow when it is in contact with the iron liquid in the early stage of casting, resulting in inoculation lag phenomenon of the iron liquid.
[0036] Preferably, the height of the plug column 111 can be appropriately increased, so that there is a gap between the bottom surface 21 of the in-mold inoculation block fixed on the plug column 111 and the groove wall of the buffer groove 112, which is suitable for the flow of iron liquid, so that the in-mold inoculation block can be completely wrapped in the iron liquid flowing through the buffer groove 112, further improving the melting speed of the in-mold inoculation block.
[0037] Figure 3 is a schematic sectional view of the second embodiment of the present application along the vertical direction of the middle axis of the straight sprue of the sand mold, wherein only part of the straight sprue is shown, Figure 4 is Figure 3 is a schematic enlarged view of the middle B area, wherein the clamping protrusion is shown, Figure 5 is a perspective view of the plug column in the second embodiment of the present application. Referring to Figure 3 、 Figure 4 and Figure 5In the second embodiment, two clamping protrusions 1111 are oppositely arranged on the column body of the plug column 111, and a pair of arc-shaped clamping grooves are oppositely arranged on the inner wall of the plug hole 211, and a plug hole is arranged on each clamping groove wall close to the hole mouth of the plug hole 211; when the user sets the plug hole 211 on the plug column 111, each clamping protrusion 1111 can first pass through the corresponding plug hole and enter the corresponding clamping groove, and then each clamping protrusion 1111 can be slid along the corresponding clamping groove by rotating the block body, so that each clamping protrusion 1111 abuts against the clamping groove wall close to the hole mouth of the plug hole 211, so that the block body 2 can be clamped on the column body of the plug column 111 through the cooperation of the clamping protrusions 1111 and the clamping grooves, thereby ensuring that the connection between the block body 2 and the plug column 111 in this embodiment is less likely to fail than in the first embodiment, thereby preventing the block body 2 from separating from the plug column 111 and floating out of the buffer groove 112 or entering the cavity along with the molten iron.
[0038] Figure 6 is a schematic sectional view of the third embodiment of the present application along the central axis of the straight sprue hole of the sand mold extending in the vertical direction, wherein only part of the straight sprue hole is shown, Figure 7 is Figure 7 is a schematic enlarged view of the C area in the middle, wherein a plug hole with an internal thread is shown by a drill bit, Figure 8 is a schematic sectional view of the third embodiment of the present application along the central axis of the straight sprue hole of the sand mold extending in the vertical direction, wherein only part of the sand mold is shown in order to show a plug hole with an internal thread opened by tapping. Referring to Figure 6 、 Figure 7 and Figure 8 In the third embodiment, the inner wall of the plug hole 211 is provided with an internal thread 2113, and the plug column 111 is provided with an external thread matched with the internal thread 2113, and the block body 2 can be connected with the plug column 111 through the screw connection of the internal thread 2113 and the external thread, so that the block body 2 can be connected on the column body of the plug column 111 through the cooperation of the internal thread 2113 and the external thread, thereby ensuring that the connection between the block body 2 and the plug column 111 in this embodiment is less likely to fail than in the second embodiment, thereby preventing the block body 2 from separating from the plug column 111 and floating out of the buffer groove 112 or entering the cavity along with the molten iron, thereby further reducing the probability of failure of the connection between the block body 2 and the plug column 111.
[0039] The working principle of the mold inoculation block of the present application in use is as follows:
[0040] The sand mold 1 is internally provided with a cavity matched with the nodular cast iron casting (not shown in the figure), a straight sprue 11 is formed on the cavity top wall of the cavity and leads to the top of the sand mold 1, a buffer groove 112 is formed on the inner wall of the straight sprue 11, three inserting columns 111 are arranged in the buffer groove 112 at intervals, an inserting hole 211 is formed on the bottom surface 21 of the in-mold inoculation block, and a glue layer 2111 is arranged on the inner wall of the inserting hole 211, the adhesive used by the glue layer 2111 can be composed of butadiene styrene rubber, industrial paraffin and solvent gasoline, so that the in-mold inoculation block can be bonded with the column body of the inserting column 111 by sleeving the inserting hole 211 on the inserting column 111, and then the molten iron flowing from the straight sprue 11 to the cavity will first flow into the buffer groove 112 and soak the in-mold inoculation block, so that the molten iron around the in-mold inoculation block can always maintain a high temperature, thereby the in-mold inoculation block is not easy to appear the phenomenon of not completely melting; and the melting process of the inoculation block can be synchronized with the casting process of the casting, so as to ensure that the in-mold inoculation block has good inoculation effect on the molten iron in the sand mold 1.
[0041] It should be noted that the above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. An in-mould inoculation block for inoculating iron melt in a sand mould (1), characterised in that: The sand mold (1) comprises a block (2), an inner part of the sand mold (1) is provided with a mold cavity, a straight sprue (11) for injecting iron liquid into the mold cavity is arranged on a cavity wall of the mold cavity, and the block (2) is arranged on an inner wall of the straight sprue (11). A plug hole (211) is arranged on a bottom surface (21) of the block (2), an insertion column (111) is arranged on the inner wall of the straight sprue (11), and the block (2) can be sleeved on the insertion column (111) and connected with the insertion column (111) through the plug hole (211).
2. An in-mold inoculant block according to claim 1, wherein: The block (2) is a rectangular platform.
3. An in-mold inoculant according to claim 2, wherein: The length ratio between the long side of the bottom surface (21), the short side of the bottom surface (21), the long side of the top surface (22) and the short side of the top surface (22) of the rectangular platform is 4:2:2:
1.
4. An in-mold inoculant according to claim 3, wherein: The length ratio between the height of the rectangular platform and the long side of the bottom surface (21) is between 0.37 and 0.
46.
5. An in-mold inoculant block according to claim 1, wherein: An adhesive layer (2111) is arranged on the inner wall of the plug hole (211), and the block (2) can be bonded with a column body of the insertion column (111) through the adhesive layer (2111).
6. An in-mold inoculant block according to claim 1, wherein: A clamping groove is arranged on the inner wall of the plug hole (211), a clamping protrusion (1111) is arranged on the column body of the insertion column (111), and when the plug hole (211) is sleeved on the insertion column (111), the clamping protrusion (1111) can extend into the clamping groove and abut against a side groove wall of the clamping groove close to an aperture of the plug hole (211).
7. An in-mold inoculant block according to claim 1, wherein: An internal thread (2113) is arranged on the inner wall of the plug hole (211), an external thread that is matched with the internal thread (2113) is arranged on the insertion column (111), and the block (2) can be connected with the insertion column (111) through screwing of the internal thread (2113) and the external thread.