A sand core mold

Abstract

A sand core mold includes an upper core box and a lower core box integrally formed. The upper core box includes a first side and a second side opposite to each other in a first direction. The first side has a sand injection hole, and the second side is recessed to form a first sand mold groove. The lower core box includes a third side and a fourth side opposite to each other in the first direction. The third side is recessed to form a second sand mold groove. The second sand mold groove and the first sand mold groove form a cavity, which communicates with the sand injection hole. Along the first direction, the size of the cavity in the second direction gradually increases from the end closer to the first side to the end closer to the fourth side. The first direction is perpendicular to the second direction. In this application, by integrally forming the upper and lower core boxes, the number of core boxes is reduced, the mold design and manufacturing cycle is shortened, thereby reducing material and processing costs. The cavity forms a draft angle with a reverse slope, so demolding can be completed simply by separating the upper and lower core boxes, reducing the breakage rate of the sand core.

Description

Technical Field

[0001] This application relates to the field of casting mold technology, specifically to a sand core mold. Background Technology

[0002] Sand cores are essential tools in the casting process for forming the internal cavities of castings, while sand core molds are key equipment in their manufacture. With the development of industrial manufacturing, the requirements for sand core quality and production efficiency are constantly increasing, leading to continuous improvements in the design and manufacturing technology of sand core molds.

[0003] In existing technologies, sand core molds mainly adopt a split structure, which includes multiple core boxes such as the first, second, third, and fourth core boxes. After the core boxes are closed, they form the corresponding sand core cavity. When the draft angle is reversed, the split structure of the sand core mold results in a long mold design and manufacturing cycle and high material and processing costs due to the large number of core box blocks and their complex shapes. During the assembly process, multiple blocks need to be assembled and fixed one by one, which is time-consuming, inefficient, difficult to demold, and the sand core is easily damaged. Utility Model Content

[0004] The purpose of this application is to provide a sand core mold that solves the problems of multiple core box segments in sand core molds, which lead to long mold design and manufacturing cycles, high material and processing costs, low assembly efficiency, difficult demolding, and easy damage to the sand core.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this application provides a sand core mold, comprising:

[0007] An integrally formed upper core box includes a first side and a second side disposed opposite to each other in a first direction. The first side is provided with a sand injection hole, and the second side is recessed to form a first sand mold groove.

[0008] The lower core box is integrally formed, and the lower core box includes a third side and a fourth side that are disposed opposite to each other in the first direction. The third side is recessed to form a second sand mold groove. The second sand mold groove and the first sand mold groove form a cavity. The cavity is connected to the sand injection hole.

[0009] Along the first direction, the size of the cavity in the second direction gradually increases from the end near the first side to the end near the fourth side, and the first direction is perpendicular to the second direction.

[0010] In one embodiment, the second side abuts against the third side, and the first sand mold groove includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall being inclined relative to the first direction.

[0011] In one embodiment, the peripheral wall is provided with a first notch and a second notch, the first notch and the second notch being disposed opposite to each other in the second direction;

[0012] The second sand mold groove has a first protrusion and a second protrusion on its groove wall. The first protrusion is located in the first notch, and the second protrusion is located in the second notch.

[0013] In one embodiment, the sand core mold further includes a first movable block, a second movable block, a third movable block, a fourth movable block, a fifth movable block, and a sixth movable block, wherein the first movable block and the second movable block are respectively movably disposed on both sides of the first protrusion;

[0014] The third and fourth movable blocks are disposed on the first movable block, forming a first groove. The fifth and sixth movable blocks are disposed on the second movable block, forming a second groove.

[0015] In one embodiment, the sand core mold further includes a seventh movable block and an eighth movable block disposed on the lower core box, and a first slot and a second slot are provided on the peripheral wall. The first slot and the second slot are disposed opposite each other in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0016] The seventh movable block is inserted into the first slot and forms a third groove with the peripheral wall, and the eighth movable block is inserted into the second slot and forms a fourth groove with the peripheral wall.

[0017] In one embodiment, the wall of the sand injection hole is provided with a plurality of third protrusions, and the plurality of third protrusions are spaced apart in the circumferential direction of the sand injection hole.

[0018] In one embodiment, the sand core mold further includes a first frame and a second frame. The first frame is sleeved on the upper core box. The first frame includes a top seat, a first side wall, a second side wall, and a third side wall. The top seat is disposed on the first side wall, and the first side wall, the second side wall, and the third side wall are arranged sequentially around the upper core box.

[0019] The second frame is fitted onto the lower core box. The second frame includes a base and a support frame disposed on the base. The support frame is supported on the outer wall of the lower core box near the first protrusion, and the support frame is disposed between the first side wall and the third side wall.

[0020] In one embodiment, the first side panel and the third side panel are each provided with a positioning pin at the end away from the top seat, and the base is provided with a positioning groove, in which the positioning pin is inserted.

[0021] In one embodiment, the diameter of the locating pin gradually decreases from the end closer to the top seat to the end farther away from the top seat.

[0022] In one embodiment, both the first side panel and the third side panel are provided with lifting lugs, each lifting lug including a support shaft and an anti-detachment protrusion, the anti-detachment protrusion being protruding from the outer wall of the support shaft.

[0023] Compared with the prior art, this application has at least the following beneficial effects:

[0024] 1. In this application, by integrating the upper core box and the lower core box into one piece, the number of core boxes is reduced, thereby improving the dimensional accuracy of the cavity after mold closing, and reducing the mold design and manufacturing cycle, thereby reducing material and processing costs and improving assembly efficiency.

[0025] 2. In this application, the size of the cavity in the second direction gradually increases from the end near the first side to the end near the fourth side, thus forming a draft angle with a reverse slope, which facilitates the demolding of the sand core. During demolding, demolding can be completed simply by separating the upper core box from the lower core box, which greatly reduces the breakage rate of the sand core and thus significantly improves the quality of the casting.

[0026] 3. In this application, by respectively installing a first frame and a second frame outside the upper core box and the lower core box, the first frame provides additional support for the upper core box and the second frame provides additional support for the lower core box, thereby enhancing the overall rigidity of the sand core mold and preventing deformation during use. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a perspective view of a sand core mold according to one embodiment of this application;

[0029] Figure 2 This is a cross-sectional view of the upper and lower core boxes according to one embodiment of this application;

[0030] Figure 3 This is a perspective view of the upper core box according to one embodiment of this application;

[0031] Figure 4 This is a perspective view of the lower core box according to one embodiment of this application;

[0032] Figure 5 This is a perspective view of a sand core according to one embodiment of this application;

[0033] Figure 6 This is a perspective view of a sand core according to one embodiment of this application.

[0034] Figure 7 This is a perspective view of the lower core box and sand core according to one embodiment of this application;

[0035] Figure 8 This is an exploded view of a sand core mold according to one embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Upper core box; 110. First side; 120. Second side; 130. Sand injection hole; 131. Third protrusion; 140. First sand mold groove; 141. Bottom wall; 142. Peripheral wall; 143. First notch; 144. Second notch; 145. First slot; 146. Second slot; 200. Lower core box; 210. Third side; 220. Fourth side; 230. Second sand mold groove; 231. First protrusion; 232. Second protrusion; 300. Mold cavity; 410. First movable block; 420. Second movable block; 430. Third movable block; 440. Fourth movable block; 450. Fifth movable block; 460. Sixth movable block; 470. Seventh movable block; 480. Eighth movable block; 51 0. First groove; 520. Second groove; 530. Third groove; 540. Fourth groove; 600. First frame; 610. Top seat; 620. First side panel; 630. Second side panel; 640. Third side panel; 650. Positioning pin; 660. Lifting lug; 661. Support shaft; 662. Anti-detachment protrusion; 700. Second frame; 710. Base; 711. Positioning groove; 720. Support frame; 800. Sand core; 810. Sand core body; 820. First sand mold; 830. Second sand mold; 840. Third sand mold; 850. Fourth sand mold; 860. Fifth sand mold; 870. Sixth sand mold; 880. Seventh sand mold; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0038] The following are specific embodiments of this application, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments.

[0039] refer to Figures 1-4This application provides a sand core mold, including an upper core box 100 and a lower core box 200 integrally formed. The upper core box 100 includes a first side 110 and a second side 120 disposed opposite each other in a first direction X. The first side 110 is provided with a sand injection hole 130, and the second side 120 is recessed to form a first sand mold groove 140. The lower core box 200 includes a third side 210 and a fourth side 220 disposed opposite each other in the first direction X. The third side 210 is recessed to form a second sand mold groove 230. The second sand mold groove 230 and the first sand mold groove 140 form a cavity 300, which communicates with the sand injection hole 130. Along the first direction X, the size of the cavity 300 in the second direction Y gradually increases from the end near the first side 110 to the end near the fourth side 220. The first direction X is perpendicular to the second direction Y.

[0040] The upper core box 100 is manufactured using a one-piece molding process, resulting in good overall structural stability and resistance to deformation. The first side 110 and the second side 120 of the upper core box 100 are positioned opposite each other in the first direction X. A sand injection hole 130 on the first side 110 is used to inject sand into the cavity 300. The diameter of the sand injection hole 130 can be designed according to actual needs to ensure smooth sand injection. The first sand groove 140 formed by the recess in the second side 120 has a specific geometric shape and is used to form a part of the sand core 800.

[0041] The lower core box 200 is also manufactured using a one-piece molding process, resulting in good structural strength. The third side 210 and the fourth side 220 of the lower core box 200 are positioned opposite each other in the first direction X, with the third side 210 being the side of the lower core box 200 closest to the second side 120 in the first direction X. The second sand mold groove 230 formed by the recess in the third side 210 mates with the first sand mold groove 140 of the upper core box 100, together forming a complete cavity 300. The cavity 300 is the space for molding the sand core 800, and its shape directly determines the final shape of the sand core 800.

[0042] The cavity 300 is connected to the sand injection hole 130, allowing sand to flow into the cavity 300 through the sand injection hole 130. Along the first direction X, the size of the cavity 300 in the second direction Y gradually increases from the end near the first side surface 110 to the end near the fourth side surface 220, thus forming a reverse draft angle to facilitate demolding of the sand core 800. During demolding, demolding can be completed simply by separating the upper core box 100 from the lower core box 200, greatly reducing the breakage rate of the sand core 800 and thus significantly improving the quality of the casting.

[0043] In this application, by integrating the upper core box 100 and the lower core box 200, the number of core boxes is reduced, thereby improving the dimensional accuracy of the cavity 300 after mold closing, and reducing the mold design and manufacturing cycle, thereby reducing material and processing costs and improving assembly efficiency.

[0044] The second side 120 abuts against the third side 210 to ensure a tight fit between the upper core box 100 and the lower core box 200, preventing sand leakage. The first sand mold groove 140 includes a bottom wall 141 and a peripheral wall 142 surrounding the bottom wall 141. The bottom wall 141 forms a main surface of the sand core 800, while the peripheral wall 142 forms the side of the sand core 800. The peripheral wall 142 is inclined relative to the first direction X. This inclined design facilitates the demolding of the sand core 800 and prevents damage to the sand core 800 during removal.

[0045] The peripheral wall 142 is provided with a first notch 143 and a second notch 144, which are arranged opposite to each other in the second direction Y. The second sand mold groove 230 has a first protrusion 231 and a second protrusion 232 protruding from its groove wall. The first protrusion 231 is disposed in the first notch 143, and the second protrusion 232 is disposed in the second notch 144. Through the cooperation of the first protrusion 231 with the first notch 143 and the second protrusion 232 with the second notch 144, the positioning accuracy between the upper core box 100 and the lower core box 200 is enhanced, ensuring that the shape of the cavity 300 is consistent each time the mold is closed.

[0046] refer to Figure 5 , Figure 6 and Figure 7 The sand core 800 to be formed in this application includes a sand core body 810, a first sand mold 820, a second sand mold 830, a third sand mold 840, a fourth sand mold 850, a fifth sand mold 860, a sixth sand mold 870, and a seventh sand mold 880. The sand core body 810 serves as the main body of the sand core 800, and the first sand mold 820, the second sand mold 830, the third sand mold 840, the fourth sand mold 850, the fifth sand mold 860, the sixth sand mold 870, and the seventh sand mold 880 are disposed on the sand core body 810.

[0047] Specifically, the first protrusion 231 is used to form the first sand mold 820, and the second protrusion 232 is used to form the second sand mold 830.

[0048] The sand core mold also includes a first movable block 410, a second movable block 420, a third movable block 430, a fourth movable block 440, a fifth movable block 450, and a sixth movable block 460. The first movable block 410 and the second movable block 420 are respectively movably disposed on both sides of the first protrusion. The design of multiple movable blocks gives the sand core mold greater flexibility, enabling it to adapt to the production needs of sand cores 800 of different shapes, and facilitating the demolding of sand cores 800. The third movable block 430 and the fourth movable block 440 are disposed on the first movable block 410, forming a first groove 510. The fifth movable block 450 and the sixth movable block 460 are disposed on the second movable block 420, forming a second groove 520.

[0049] The first groove 510 is used to form the third sand mold 840, and the second groove 520 is used to form the fourth sand mold 850. The third sand mold 840 and the fourth sand mold 850 can serve as the connection part of the sand core 800.

[0050] The sand mold also includes a seventh movable block 470 and an eighth movable block 480 disposed on the lower core box 200. A first slot 145 and a second slot 146 are provided on the peripheral wall 142. The first slot 145 and the second slot 146 are arranged opposite each other in the third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other, forming a complete three-dimensional coordinate system. The seventh movable block 470 is inserted into the first slot 145 and forms a third groove 530 with the peripheral wall 142, and the eighth movable block 480 is inserted into the second slot 146 and forms a fourth groove 540 with the peripheral wall 142.

[0051] The third groove 530 is used to form the fifth sand mold 860, and the fourth groove 540 is used to form the sixth sand mold 870. The third sand mold 840 and the fourth sand mold 850 can serve as the connection parts of the sand core 800, which further increases the structural complexity of the sand core 800 and enables it to meet more diverse casting application needs.

[0052] The sand injection hole 130 has a plurality of third protrusions 131 on its hole wall, and the plurality of third protrusions 131 are spaced apart in the circumferential direction of the sand injection hole 130. These third protrusions 131 are used to form the seventh sand mold 880.

[0053] refer to Figures 5-8 The sand core mold also includes a first frame 600 and a second frame 700. The first frame 600 is fitted onto the upper core box 100 and includes a top seat 610, a first side wall 620, a second side wall 630, and a third side wall 640. The top seat 610 is disposed on the first side wall 110, and the first side wall 620, second side wall 630, and third side wall 640 are sequentially arranged around the upper core box 100. The frame design enhances the overall rigidity of the mold and prevents deformation during use. The second frame 700 is fitted onto the lower core box 200 and includes a base 710 and a support frame 720 disposed on the base 710. The support frame 720 is supported on the outer wall of the lower core box 200 near the first protrusion 231, and is disposed between the first side wall 620 and the third side wall 640. The support frame 720 provides additional structural support, especially in high-temperature environments, effectively preventing mold deformation.

[0054] Both the first side panel 620 and the third side panel 640 have locating pins 650 at their ends away from the top seat 610, and the base 710 has a locating groove 711 in which the locating pins 650 are inserted. The cooperation between the locating pins 650 and the locating grooves 711 ensures precise alignment of the upper core box 100 and the lower core box 200 during mold closing, reducing defects in the sand core 800 caused by misalignment. The diameter of the locating pins 650 gradually decreases from the end near the top seat 610 to the end away from the top seat 610. This tapered design makes it easier for the locating pins 650 to be inserted into the locating grooves 711, improving mold closing efficiency.

[0055] Lifting lugs 660 are provided on both the first side panel 620 and the third side panel 640. Each lifting lug 660 includes a support shaft 661 and an anti-slip protrusion 662, which protrudes from the outer wall of the support shaft 661. The lifting lugs 660 are used for lifting and transporting the mold, and the anti-slip protrusion 662 prevents the lifting equipment from slipping off the support shaft 661, thus improving operational safety.

[0056] In actual use, the upper core box 100 and the lower core box 200 are first separated, and then a release agent is applied to the surface of the cavity 300 to facilitate the subsequent removal of the sand core 800. Next, the upper core box 100 and the lower core box 200 are closed, so that the second side 120 and the third side 210 are tightly abutted, and the first protrusion 231 and the second protrusion 232 are respectively inserted into the first notch 143 and the second notch 144. The precise alignment of the upper core box 100 and the lower core box 200 is ensured through the cooperation of the positioning pin 650 and the positioning groove 711.

[0057] Then, sand is injected into the cavity 300 through the sand injection hole 130, and the sand fills the entire cavity 300 under the action of injection pressure. Since the size of the cavity 300 in the second direction Y gradually increases from the end near the first side 110 to the end near the fourth side 220, the sand can flow and fill more evenly, reducing the generation of air bubbles and inclusions. The third protrusion 131 in the sand injection hole 130 guides the flow direction of the sand, further improving the filling effect.

[0058] After the sand material has solidified, the upper core box 100 and the lower core box 200 are separated, and the formed sand core 800 is removed. Because the peripheral wall 142 is inclined relative to the first direction X, the sand core 800 can be easily ejected from the mold without being damaged due to jamming. The design of each movable block allows for smooth demolding of sand cores 800 with complex shapes, greatly improving the integrity and pass rate of the sand core 800.

[0059] This sand core mold has a compact structure and is easy to operate. It can produce sand cores 800 with complex shapes and precise dimensions, meeting the high quality requirements of modern casting processes. At the same time, the integrated design of the upper core box 100 and lower core box 200, along with the frame support, gives the sand core mold good durability and stability.

[0060] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0061] Furthermore, the use of terms such as "first," "second," and "a" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

Claims

1. A sand core mold, characterized in that, include: An integrally formed upper core box includes a first side and a second side disposed opposite to each other in a first direction. The first side is provided with a sand injection hole, and the second side is recessed to form a first sand mold groove. The lower core box is integrally formed, and the lower core box includes a third side and a fourth side that are disposed opposite to each other in the first direction. The third side is recessed to form a second sand mold groove. The second sand mold groove and the first sand mold groove form a cavity. The cavity is connected to the sand injection hole. Along the first direction, the size of the cavity in the second direction gradually increases from the end near the first side to the end near the fourth side, and the first direction is perpendicular to the second direction.

2. A sand core mold according to claim 1, characterized in that, The second side abuts against the third side, and the first sand mold groove includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall being inclined relative to the first direction.

3. A sand core mold according to claim 2, characterized in that, The peripheral wall is provided with a first notch and a second notch, which are arranged opposite to each other in the second direction; The second sand mold groove has a first protrusion and a second protrusion on its groove wall. The first protrusion is located in the first notch, and the second protrusion is located in the second notch.

4. A sand core mold according to claim 3, characterized in that, The sand core mold further includes a first movable block, a second movable block, a third movable block, a fourth movable block, a fifth movable block, and a sixth movable block, wherein the first movable block and the second movable block are respectively movably disposed on both sides of the first protrusion; The third and fourth movable blocks are disposed on the first movable block, forming a first groove. The fifth and sixth movable blocks are disposed on the second movable block, forming a second groove.

5. A sand core mold according to claim 2, characterized in that, The sand core mold also includes a seventh movable block and an eighth movable block disposed on the lower core box. A first slot and a second slot are provided on the peripheral wall. The first slot and the second slot are disposed opposite each other in a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The seventh movable block is inserted into the first slot and forms a third groove with the peripheral wall, and the eighth movable block is inserted into the second slot and forms a fourth groove with the peripheral wall.

6. A sand core mold according to claim 1, characterized in that, The wall of the sand injection hole is provided with a plurality of third protrusions, which are spaced apart in the circumferential direction of the sand injection hole.

7. A sand core mold according to claim 3, characterized in that, The sand core mold also includes a first frame and a second frame. The first frame is sleeved on the upper core box. The first frame includes a top seat, a first side wall, a second side wall and a third side wall. The top seat is disposed on the first side wall. The first side wall, the second side wall and the third side wall are arranged around the upper core box in sequence. The second frame is fitted onto the lower core box. The second frame includes a base and a support frame disposed on the base. The support frame is supported on the outer wall of the lower core box near the first protrusion, and the support frame is disposed between the first side wall and the third side wall.

8. A sand core mold according to claim 7, characterized in that, Both the first side panel and the third side panel are provided with a positioning pin at the end away from the top seat, and the base is provided with a positioning groove, in which the positioning pin is inserted.

9. A sand core mold according to claim 8, characterized in that, The diameter of the locating pin gradually decreases from the end closer to the top seat to the end farther away from the top seat.

10. A sand core mold according to claim 7, characterized in that, Both the first side panel and the third side panel are provided with lifting lugs. Each lifting lug includes a support shaft and an anti-slip protrusion. The anti-slip protrusion protrudes from the outer wall of the support shaft.

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