Casting combined core with pre-drawing kinetic energy
By designing a casting composite core with pre-extraction kinetic energy, and utilizing the relative movement of the central core and side cores, the problem of casting collapse in low-pressure gravity casting is solved, achieving efficient and environmentally friendly separation of the core and casting.
Patent Information
- Application Number
- CN202422385922.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In low-pressure gravity casting, especially when the core is large and the draft angle is small or the wall of the push rod is thin, the existing metal core is easy to cause the casting to collapse, and the sand core is not economical and environmentally friendly.
A casting composite core with pre-extraction kinetic energy is adopted. The core consists of a central core and side cores. Through a pushing device and an inclined design, the relative movement of the central core and side cores is realized, eliminating the lateral pressure of the side core on the casting and avoiding contact between the push rod and the casting.
It effectively avoids casting collapse, reduces the lateral pressure of the core on the casting, and enables the separation of the core and casting without the need for a pusher rod, thus improving casting efficiency and environmental friendliness.
Smart Images
Figure CN223476257U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold cores, specifically a casting composite mold core with pre-extraction kinetic energy. Background Technology
[0002] Cores are commonly used in metal casting, and there are two main types of materials: sand cores and metal cores. Metal cores are commonly used in die casting due to their environmental friendliness and low cost. However, in low-pressure gravity casting, especially when there are large cores and small die angles or thin walls at the ejector rod ejection position, the small area of the ejector rod can easily cause the casting to collapse. Therefore, sand cores, which are not economical or environmentally friendly, are often used. Utility Model Content
[0003] To address the aforementioned problems, this invention provides a casting composite core with pre-extraction kinetic energy, which effectively overcomes the shortcomings of existing technologies.
[0004] This utility model is achieved through the following technical solution: a casting composite core with pre-pulling kinetic energy, the core is composed of a central core and at least two side cores, the central core and the side cores can move relative to each other in the core pulling direction, there is a side core connecting rod with one end connected to the side core and the other end fixed to the side core connecting plate, there is a central core connecting plate connected to the central core, and there is a pushing device between the side core connecting plate and the central core connecting plate, which can combine the central core and each side core into a complete core or displace the two relative to each other in the core pulling direction.
[0005] As a preferred technical solution, both the center core and the side core have an angle on the mating surface, and the direction of the angle is such that the core being pulled out is smaller at the bottom end of the casting than at the other end.
[0006] As a preferred technical solution, the center core can be pulled in the core-pulling direction based on the side core.
[0007] As a preferred technical solution, the side cores can be pulled in the core-pulling direction, with the central core as the reference.
[0008] As a preferred technical solution, the side core connecting rod has a boss, the center core connecting plate has a center core pushing flange, there is a corresponding plane between the flange face and the boss, and there is a rotatable flat shaft between the two planes. When the short axis of the flat shaft is located between the two planes, a spring pushes the center core and the side core to align and combine them into a complete core. When the long axis of the flat shaft is located between the two planes, the center core is pushed and misaligned with the side core.
[0009] As a preferred technical solution, the side core connecting plate has screw holes with screws in them. The center line of the screws is parallel to the core-pulling direction and aligned with the center of the central core. One end of the screw can be driven, and the other end has a head flange. The central core connecting plate has a push flange and a pull flange for the central core. The two flanges are fixed to each other, with a gap in the middle. The head flange of the central core push-pull screw is located in the gap. The rotation of the central core push-pull screw can drive the push flange and the pull flange respectively through the head flange, so that the central core and the side core can be combined into one piece or misaligned in the core-pulling direction.
[0010] As a preferred technical solution, the side core is connected to the side core connecting plate by an elastic connecting rod. In its natural state, the outer dimensions of the side core are smaller than the outer dimensions of the overall core. When the center core and the side core are combined to form the overall core, the side core is opened up and its outer dimensions are equal to the outer dimensions of the overall core.
[0011] As a preferred technical solution, the core connecting rod and the central core connecting flange are respectively equipped with an inner pressure hook and an active inner pressure hook. The two hooks have inclined surfaces corresponding to the core pulling direction. When the central core is pulled away from the casting position, the active inner pressure hook will retract the inner pressure hook inward, while simultaneously driving the side core to shrink inward.
[0012] The beneficial effects of this utility model are: the integral core block is divided into a central core and at least two side cores. Before ejecting the casting, the central core is first pulled with the side cores as the reference, which can eliminate the lateral pressure of the side cores on the casting, making it easier to eject the casting. Alternatively, the side cores can be pulled with the central core as the reference, which can reduce the lateral pressure of the core on the casting. At the same time, it can prevent the casting from collapsing at the contact point between the push rod and the casting. With the side core inward pressing device, the core and casting can be separated without the push rod contacting the casting. Attached Figure Description
[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0014] Figure 1 This is a diagram showing the positional relationship between the core and the casting die of this utility model.
[0015] Figure 2 This is a schematic diagram showing the positional relationship between the core, casting, and ejection mechanism of this utility model.
[0016] Figure 3 This is a schematic diagram showing the parting of the central core and the two side cores of this utility model;
[0017] Figure 4 This is a schematic diagram showing the parting of the central core and four side cores of this utility model;
[0018] Figure 5 This is a schematic diagram showing the separation of the inclined center core and the four side cores of this utility model;
[0019] Figure 6 This is a side view of the side core and the side core connecting part of this utility model.
[0020] Figure 7 This is a cross-sectional view of the side core and the side core connecting part of this utility model.
[0021] Figure 8 This is a schematic diagram showing the positional relationship between the central core and the positioning plate assembly of this utility model;
[0022] Figure 9 This is a top view of the central core and positioning plate assembly of this utility model;
[0023] Figure 10 This is a cross-sectional view of the side core and side core support assembly (with positioning holes) of this utility model;
[0024] Figure 11 This is a schematic diagram showing the positional relationship between the central core and the positioning plate assembly (with positioning pin) of this utility model;
[0025] Figure 12 This is a top view of the central core and positioning plate assembly (with positioning pin) of this utility model;
[0026] Figure 13 This is a schematic diagram of the pre-separation device for the center core and side core of this utility model, which is a flat shaft.
[0027] Figure 14 This is a schematic diagram illustrating how the rotation of the flat shaft separates the central core and the side core according to this utility model.
[0028] Figure 15 This is a schematic diagram of the screw pulling mechanism for the pre-separation device of the center core and side core of this utility model;
[0029] Figure 16 This is a schematic diagram illustrating how the screw pulls the center core and the side core of this utility model to separate.
[0030] Figure 17 This is a schematic diagram showing the positional relationship between the center core and side core of the casting according to this utility model;
[0031] Figure 18 This is a schematic diagram showing the boundary markings between the bottom, center core, and side core of the finished casting of this utility model.
[0032] Figure 19This is a schematic diagram of the dividing mark between the center core and the side core of the finished casting of this utility model.
[0033] Figure 20 This is a schematic diagram of the side core deterioration elastic connection of this utility model;
[0034] Figure 21 This is a schematic diagram of the inner pressure hook with side core of this utility model;
[0035] Figure 22 This is a schematic diagram showing that the active inner pressure hook of this utility model is not in contact with the inner pressure hook of the connecting rod;
[0036] Figure 23 This is a schematic diagram of the active inner pressure hook of the present invention pressing the inner pressure hook of the connecting rod to move the side core inward;
[0037] Figure 24 This is a schematic diagram of the closed casting mold of this utility model.
[0038] Explanation of reference numerals in the attached figures:
[0039] 1. Die; 2. Casting; 3. Core; 301. Core support; 302. Center core with two side cores; 303. One of the two side cores; 304. Center core with four side cores; 305. One of the four side cores; 306. Center core with four side cores and an angle; 307. One of the four side cores and an angle; 3071. One of the four side cores with an angle and a locating pin; 4. Push rod; 5. Side core connecting rod; 501. Side core connecting rod flat shaft backing; 502. Side core elastic connecting rod; 503. Connecting rod inner pressure hook; 6. Side 601. Side core connecting plate with screw holes; 7. Center core connecting plate; 701. Center core connecting plate with locating pin; 8. Locating pin hole; 9. Locating pin; 10. Center core connecting rod; 11. Center core pushing flange; 1101. Active internal pressure hook; 12. Flat shaft; 13. Center core pulling flange; 14. Center core push-pull screw; 15. Center core push-pull screw head flange; 16. Mark at the boundary between the center core and side core at the bottom of the casting; 17. Mark at the boundary between the center core and side core on the side of the casting; 18. Combined core closing plate. Detailed Implementation
[0040] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.
[0041] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.
[0042] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0043] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0044] The terms used in this invention, such as “above,” “over,” “below,” and “under,” indicating spatial relative position, are for ease of description to depict the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms of spatial relative position may be intended to include different orientations of the device in use or operation other than those shown in the figures. For example, if the device in the figures is flipped, a unit described as being “below” or “under” other units or features would be located “above” other units or features. Therefore, the exemplary term “under” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise), and the spatially related descriptive terms used herein will be interpreted accordingly.
[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0046] Example 1
[0047] like Figure 3 As shown in the figure, the square in the figure is the overall shape of the core. There are two dividing lines that divide the whole into a central core 302 with two side cores and two central cores 302 with two side cores.
[0048] Example 2
[0049] like Figure 4 As shown, four lines divide the core into a central core 304 with four side cores and one of the four side cores 305. Using one of the four side cores 305 as a reference, the central core 304 with four side cores can be extracted first, reducing the pressure on the diagonal parts of one of the four side cores 305. This results in a relatively... Figure 2 When push rod 4 pushes casting 2 and core 3 to separate, the contact area between push rod 4 and casting 2 is very small, which will cause the contact point between casting 2 and push rod 4 to collapse. Pulling the center core 304 with four side cores 305 as a reference will not affect the casting. When the center core 304 with four side cores is pulled out, the lateral force between one of the four side cores 305 at the four corners and casting 2 is not supported, and it can be completed with a very small force. At this time, the relative pushing force between push rod 4 and casting 2 is very small and will not cause the casting to collapse.
[0050] Example 3
[0051] Based on Example 2, one of the four side cores 307 with an angled bevel and the center core 306 with an angled bevel each have corresponding angles. The angle direction is such that the pulling block is narrower at the bottom of the casting. When the center core 306 of the four side cores has a small displacement in the core pulling direction, the lateral pressure of the center core 306 on one of the four side cores 307 with an angled bevel is immediately reduced, and the core can be pulled out smoothly. Figure 6 and Figure 7 The images show a side view and a top sectional view of a central core 304 with four side cores connected as a single unit via side core connecting rods 5 and side core connecting plates 6. Figure 8 This is a diagram showing the combination of the center core 306 and the center core connecting plate 7, which are four side cores with an angle. Figure 9 It is a top view. Figure 6 One of the four side cores with an angle, 307 and Figure 8 The four side cores with bevels in the middle are fitted together by beveled surfaces. Figure 10 It is based on the central core connecting plate 7, with the addition of one of the four side cores 3071 with a locating pin and an angled design. The corresponding components include... Figure 11 and Figure 12 As shown, Figure 11 and Figure 12 Is Figure 8 and Figure 9 Based on the existing design, a locating pin 9 is added. When the center core and the four side cores mate, the locating pin 9 engages with the locating pin hole 8 on one of the four side cores 3071, which has a locating pin angle, to achieve precise overall core fit. Furthermore, a pulling device is added between the center core and the side cores, such as... Figure 13 As shown, in Figure 6 Based on the existing design, a side core connecting rod flat shaft backing 501 was added. Figure 12 Based on the above, a central core connecting rod 10 and a central core pushing flange 11 are added to the upper part of the central core connecting plate 701 with positioning pin. The flat shaft 12 is located between the side core connecting rod 501 and the central core pushing flange 11. Figure 13 The middle flat shaft 12 is the short side between the side core connecting rod flat shaft backing 501 and the center core pushing flange 11. At this time, the center core 306 of the four side cores with bevels and one of the four side cores 307 with bevels fit together to form a complete core block. After casting is completed, as shown... Figure 14 As shown, the flat shaft 12 rotates 90°. The long side of the flat shaft 12 is located between the side core connecting rod flat shaft backing 501 and the central core pushing flange 11. Since the central core pushing flange 11, the central core connecting rod 10, the central core connecting plate 701 with positioning pins, and the central core 306 of the four inclined side cores are integrated, the central core 306 of the four inclined side cores is pulled upwards. Because the contact surface between the central core 306 of the four inclined side cores and one of the four inclined side cores 307 has an inclination (not shown in the figure, refer to...),... Figure 5 When the center core 306 of the four angled side cores faces upward, the lateral pressure exerted by the center core 306 on the casting passing through one of the four angled side cores 307 is immediately eliminated. During this process, no pressure is applied to the casting 2. Once there is no lateral pressure from one of the four angled side cores 307 on the casting, the casting can be easily ejected by a conventional ejection mechanism (such as...). Figure 2 (As shown) was launched. Figure 17 The positional relationship between one of the four angled side cores 307 and the center core 306 of the four angled side cores after casting is determined. After the casting is demolded, it will leave... Figure 18 Mark 16 and at the boundary between the bottom center core and the side core of the casting Figure 19 Mark 17 is located at the boundary between the center core and the side core of the casting.
[0052] Example 4
[0053] The difference from Example 3 is the core-pulling mechanism, such as... Figure 15As shown, a central core connecting rod, a central core pushing flange 11, and a central core pulling flange 13 are added to the central core connecting plate 701 with locating pins. Screw holes are drilled on the central core connecting plate 601 with screw holes, and central core push-pull screws 14 and central core push-pull screw head flanges 15 are installed in these holes. The lower end of the central core push-pull screw 14 has a central core push-pull screw head flange 15, which is located between the central core pulling flange 13 and the central core pushing flange 11. When the central core push-pull screw 14 rotates upward, it can pull the central core pulling flange 13 upward; when the central core push-pull screw 14 rotates downward, it can push the central core pushing flange 11 downward. Figure 15 In the middle position, the central core push flange 11 descends, causing one of the four angled side cores 307 and the central core 306 with the four angled side cores to fit together to form a complete core block. After casting is completed, the central core push-pull screw head flange 15 rotates and rises, pulling the central core pull flange 13, the central core push flange 11, the central core connecting rod 10, the central core connecting plate 701 with positioning pin, and the central core 306 with the four angled side cores to rise. Figure 16 The position of the center core 306 after it has risen from the four side cores with an inclination.
[0054] Example 5
[0055] Unlike Examples 3 and 4, as follows Figure 20 As shown, and Figure 6 As shown, one of the four inclined side cores 307 is fixed to the side core connecting plate 6 by the side core elastic connecting rod 502. The side core elastic connecting rod 502 is an elastic connecting rod, and its external dimension after fixing is E1, which is smaller than the normal dimension E of the core. When the central core 306 of the four inclined side cores is pressed down, one of the four inclined side cores 307 is opened up, with an external dimension E. When the casting is completed and the central core 306 of the four inclined side cores is pulled out, the external dimension between the four inclined side cores 307 is rebounded to E1 under the action of the side core elastic connecting rod 502. At this time, the four side cores automatically separate from the casting.
[0056] Example 6
[0057] Unlike Example 4, as Figure 21As shown, the inner side of the side core connecting rod 5 has a connecting rod inner pressure hook 503, and the outer side of the center core pushing flange 11 has an active inner pressure hook 1101. The connecting rod inner pressure hook 503 has a corresponding inclined surface to the active inner pressure hook 1101. When the center core push-pull screw head flange 15 pulls the center core pulling flange 13 upward, the center core 306 and one of the four inclined side cores 307 of the four side cores begin to separate. Then, the active inner pressure hook 1101 on the outer side of the center core pushing flange 11 and the inclined surface on the connecting rod inner pressure hook 503 begin to contact. When the center core push-pull screw head flange 15 pulls the center core pulling flange 13 to continue to rise, the connecting rod inner pressure hook 503 is pushed inward due to the action of the inclined surface, which drives the side core connecting rod 5 inward, and at the same time drives one of the four inclined side cores 307 inward. When one of the four inclined side cores 307 is inward, it automatically separates from the casting 2.
[0058] Example 7
[0059] The application scope of the above embodiments is for combined cores used in open casting, i.e. Figure 1 In the arrangement shown, the cavity mold 1 is at the bottom and the core is at the top. The casting is open between the cavity mold 1 and the core support 3. When used in applications such as die casting or low-pressure casting, the mold needs to be closed, which requires... Figure 24 The arrangement shown, Figure 24 compared to Figure 13 A combined core sealing plate 18 is added. The combined core sealing plate 18 has a hole in the middle, and the hole is consistent with the shape of the combined core. One side contacts the top of the cavity mold 1 to form a closed mold space. The other side is fixed to the side core connecting plate 6 or to the lifting seat of the side core connecting plate 6. The structure in this embodiment can be used for low-pressure or pressure casting and can be arranged in any direction.
[0060] The beneficial effects of this utility model are: the integral core block is divided into a central core and at least two side cores. Before ejecting the casting, the central core is first pulled with the side cores as the reference, which can eliminate the lateral pressure of the side cores on the casting, making it easier to eject the casting. Alternatively, the side cores can be pulled with the central core as the reference, which can reduce the lateral pressure of the core on the casting. At the same time, it can prevent the casting from collapsing at the contact point between the push rod and the casting. With the side core inward pressing device, the core and casting can be separated without the push rod contacting the casting.
[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.
Claims
1. A casting composite core with pre-extraction kinetic energy, characterized in that: The core consists of a central core and at least two side cores. The central core and the side cores can move relative to each other in the core-pulling direction. There is a side core connecting rod with one end connected to the side core and the other end fixed to the side core connecting plate. There is a central core connecting plate connected to the central core. There is a pushing device between the side core connecting plate and the central core connecting plate, which can combine the central core and each side core into a complete core or displace the two relative to each other in the core-pulling direction.
2. The casting composite core with pre-pull kinetic energy according to claim 1, characterized in that: Both the center core and the side cores have an angle on the mating surface. The direction of the angle is such that when the core is pulled out, the bottom end of the casting is smaller than the other end.
3. The casting composite core with pre-pull kinetic energy according to claim 1, characterized in that: The center core can be pulled in the core-pulling direction using the side core as a reference.
4. The casting composite core with pre-pull kinetic energy according to claim 1, characterized in that: The side cores can be pulled in the core-pulling direction, with the center core as the reference.
5. The casting composite core with pre-drawing kinetic energy according to claim 1, 2, or 3, characterized in that: The side core connecting rod has a boss, and the center core connecting plate has a center core pushing flange. There are corresponding planes between the flange face and the boss. There is a rotatable flat shaft between the two planes. When the short axis of the flat shaft is between the two planes, a spring pushes the center core and the side core to align and combine them into a complete core. When the long axis of the flat shaft is between the two planes, the center core is pushed and misaligned with the side core.
6. The casting composite core with pre-pull kinetic energy according to claim 1, 2, or 3, characterized in that: The side core connecting plate has screw holes with screws. The screw centerline is parallel to the core-pulling direction and aligned with the center of the central core. One end of the screw can be driven, and the other end has a head flange. The central core connecting plate has a push flange and a central core pull flange. The two flanges are fixed to each other, with a gap in the middle. The head flange of the central core push-pull screw is in the gap. The rotation of the central core push-pull screw can drive the push flange and pull flange respectively through the head flange, so that the central core and the side core can be combined into one piece or misaligned in the core-pulling direction.
7. The casting composite core with pre-drawing kinetic energy according to claim 1, 2, or 3, characterized in that: The side core is connected to the side core connecting plate by an elastic connecting rod. In its natural state, the outer dimensions of the side core are smaller than the outer dimensions of the overall core. When the center core and the side core are combined to form the overall core, the side core is opened up and its outer dimensions are equal to the outer dimensions of the overall core.
8. The casting composite core with pre-drawing kinetic energy according to claim 1, 2, or 3, characterized in that: The core connecting rod and the center core connecting flange are respectively equipped with an inner pressure hook and an active inner pressure hook. The two hooks have bevels with corresponding core-pulling directions. When the center core is pulled away from the casting position, the active inner pressure hook will retract the inner pressure hook inward, and at the same time drive the side core to shrink inward.