A core positioning mechanism in a precision sand casting mold

Abstract

This utility model discloses a core positioning mechanism in a precision sand casting mold, including an upper sand mold, a lower sand mold, a cavity, a sand core, a fixed core head, a fixing mechanism, and a positioning core head. The upper sand mold is located on top of the lower sand mold, and both the upper and lower sand molds have cavities inside. The top of the cavity of the upper sand mold has a positioning hole. The sand core is installed inside the cavity. Both the fixed core head and the positioning core head are fixed on the top of the sand core and connected to the positioning hole of the upper sand mold. The fixing mechanism is installed inside the sand core. The fixing mechanism includes a connecting pipe, a push rod, a push plate, a trapezoidal block, a support plate, and a shell. The connecting pipe is fixed inside the sand core, and a connecting groove is provided inside the connecting pipe, penetrating the connecting pipe. The shell is located outside the sand core, and an installation groove is provided inside the core head, communicating with the connecting groove. This utility model can fix the sand core on the upper sand mold; it is convenient to install; it can position the sand core; and it can fix the shell on the sand core to prevent the shell from slipping.

Description

Technical Field

[0001] This utility model belongs to the field of precision sand casting mold technology, and specifically relates to a core positioning mechanism in a precision sand casting mold. Background Technology

[0002] The sand cores used to produce thick castings are large in volume and weight. They are usually fixed in the mold by hand using adhesives. Therefore, positional deviations are easy to occur during the installation of the sand cores. Furthermore, the molten metal can exert external forces on the sand cores during the pouring process, causing them to shift and thus affecting the dimensional accuracy of the castings.

[0003] A search revealed a casting structure for fixing a large lifting core, with existing technology announcement number CN219683882U. This structure includes an upper casting model, a lower casting model, a lifting core sand core, and a sand core fastening device. The lifting core sand core is set in the cavity formed by the upper and lower casting models through the sand core fastening device. However, this process has the following drawbacks: the nut and screw are located inside the cavity, which can affect the quality of the casting.

[0004] A search revealed a core positioning mechanism in a sand casting mold (existing technology announcement number CN219986155U) and its casting mold. The mechanism includes at least two positioning rods, one end of which is perpendicular to the base and inserted into it, while the other end is embedded and fixed inside the sand core. When the positioning rod is inserted into the base, a forming gap is left between the sand core and the base. The sand casting mold includes a base, multiple sand cores, and a core positioning mechanism. The base has circumferential sidewalls, and a top wall is provided at the top of the sidewalls. However, this process has the following drawbacks: for suspended sand cores, the positioning rods are located at the bottom of the sand core and are exposed inside the mold cavity, which can affect the structure of the casting. Summary of the Invention

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a core positioning mechanism in a precision sand casting mold. The support plate moves into the fixing hole of the upper sand mold, thereby fixing the sand core on the upper sand mold; at the same time, it is convenient to install; the positioning core can position the sand core, and at the same time, the through hole on the side wall of the fixing core corresponds to the fixing groove on the upper sand mold, which facilitates the fixing mechanism to fix the sand core; the "L" shaped plate is installed in the insertion groove I and insertion groove II through plug-in, which can fix the outer shell on the sand core and prevent the outer shell from slipping off.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A core positioning mechanism in a precision sand casting mold includes an upper sand mold, a lower sand mold, a cavity, a sand core, a fixed core, a fixing mechanism, and a positioning core. The upper sand mold is located on top of the lower sand mold, and both the upper and lower sand molds have cavities inside. The top of the cavity of the upper sand mold has a positioning hole. The sand core is installed inside the cavity. Both the fixed core and the positioning core are fixed on the top of the sand core and connected to the positioning hole of the upper sand mold. The fixing mechanism is installed inside the sand core and the fixed core and passes through the fixed core to connect with the upper sand mold.

[0008] The fixing mechanism includes a connecting pipe, a push rod, a push plate, trapezoidal blocks, a support plate, and a housing. The connecting pipe is fixed inside the sand core, and a connecting groove is provided inside the connecting pipe, which penetrates the connecting pipe. The housing is located outside the sand core, and an installation groove is provided inside the fixed core head, which communicates with the connecting groove. One end of the push rod is connected to the housing, and the other end passes through the connecting pipe. The push plate is fixed at the end of the push rod located inside the connecting pipe. Several trapezoidal blocks are provided and evenly fixed on the side wall of the push plate. Several evenly distributed fixing grooves are provided in the positioning hole connecting the upper core and the fixed core head, and several through holes are provided on the side wall of the fixed core head, with the fixing grooves corresponding to the through holes. Several support plates are provided, and the support plates are located inside the through holes. The end of the support plate away from the through hole is inclined, and the inclined end of the support plate has a dovetail groove. The trapezoidal blocks are movably connected in the dovetail groove.

[0009] The fixed core head is located at the center of the sand core; while the positioning core heads are provided in several places, and are evenly distributed around the fixed core head.

[0010] The outer shell is provided with several evenly distributed insertion slots I, and the sand core sidewall is provided with several evenly distributed insertion slots II. Insertion slots I and II correspond to each other, and the "L"-shaped plate is inserted into the insertion slots I and II.

[0011] The sand core has a limiting groove on its side wall and a limiting plate on its inner side wall, with the limiting plate inserted inside the limiting groove.

[0012] The advantages of this utility model compared with the prior art are as follows:

[0013] 1) Push the outer shell, causing the outer shell to move the push rod along the connecting pipe. The push rod moves the push plate, and the push plate moves the trapezoidal block along the dovetail groove, thereby causing the support plate to move outward along the through hole. The support plate moves into the fixing hole of the upper sand mold, thus fixing the sand core on the upper sand mold; at the same time, it is convenient for installation.

[0014] 2) The positioning core head can position the sand core and make the through hole on the side wall of the fixing core head correspond to the fixing groove on the upper sand mold, so as to facilitate the fixing mechanism to fix the sand core; the "L" shaped plate is installed inside the insertion groove I and insertion groove II through plugging, which can fix the outer shell on the sand core and prevent the outer shell from slipping off. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the core positioning mechanism in a precision sand casting mold according to this utility model. Figure 1 ;

[0016] Appendix Figure 2 This is a schematic diagram of the sand core structure in the core positioning mechanism of a precision sand casting mold according to this utility model;

[0017] Appendix Figure 3 This is a schematic diagram of the internal structure of a core positioning mechanism in a precision sand casting mold according to this utility model;

[0018] Appendix Figure 4 This is a schematic diagram of the fixing mechanism in the core positioning mechanism of a precision sand casting mold according to this utility model;

[0019] Appendix Figure 5 This is a schematic diagram of the upper sand mold in the core positioning mechanism of a precision sand casting mold according to this utility model;

[0020] Appendix Figure 6 This is a schematic diagram of the core positioning mechanism in a precision sand casting mold according to this utility model. Figure 2 ;

[0021] In the diagram: 1. Upper sand mold; 101. Positioning hole; 102. Fixing groove; 2. Lower sand mold; 3. Cavity; 4. Sand core; 401. Limiting groove; 402. Insertion groove II; 5. Fixing core head; 501. Mounting groove; 502. Through hole; 6. Fixing mechanism; 601. Connecting pipe; 6011. Connecting groove; 602. Push rod; 603. Push plate; 604. Trapezoidal block; 605. Support plate; 6051. Dovetail groove; 606. Outer shell; 6061. Limiting plate; 6062. Insertion groove I; 607. "L" shaped plate; 7. Positioning core head. Detailed Implementation

[0022] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-6 The technical solution of this utility model will be further described in detail below.

[0023] A core positioning mechanism in a precision sand casting mold includes an upper sand mold 1, a lower sand mold 2, a cavity 3, a sand core 4, a fixed core head 5, a fixing mechanism 6, and a positioning core head 7. The upper sand mold 1 is located on top of the lower sand mold 2, and the upper sand mold 1 and the lower sand mold 2 are provided with cavities 3 inside. The top of the cavity 3 of the upper sand mold 1 is provided with a positioning hole 101. The sand core 4 is installed inside the cavity 3. The fixed core head 5 and the positioning core head 7 are both fixed on the top of the sand core 4 and connected to the positioning hole 101 of the upper sand mold 1. The fixing mechanism 6 is installed inside the sand core 4 and the fixed core head 5 and passes through the fixed core head 5 to connect with the upper sand mold 1. First, the sand core 4 with the fixed core head 5 and the positioning core head 7 is installed on the upper sand mold 1 and fixed by the fixing mechanism 6. Then, the upper sand mold 1 and the lower sand mold 2 are closed and casting is performed.

[0024] The fixing mechanism 6 includes a connecting pipe 601, a push rod 602, a push plate 603, a trapezoidal block 604, a support plate 605, and a housing 606. The connecting pipe 601 is fixed inside the sand core 4, and a connecting groove 6011 is provided inside the connecting pipe 601, which penetrates the connecting pipe 601. The housing 606 is located outside the sand core 4, and an installation groove 501 is provided inside the fixing core head 5, which communicates with the connecting groove 6011. One end of the push rod 602 is connected to the housing 606, and the other end passes through the connecting pipe 601. The push plate 603 is fixed to the end of the push rod 602 located inside the connecting pipe 601. Several trapezoidal blocks 604 are provided and are evenly fixed on the side wall of the push plate 603. Several evenly distributed fixing grooves 102 are provided in the positioning hole 101 connecting the upper sand mold 1 and the fixing core head 5. The fixed core head 5 has several through holes 502 on its side wall, and the fixing groove 102 corresponds to the through holes 502. Several support plates 605 are provided, and the support plates 605 are located inside the through holes 502. The end of the support plate 605 away from the through holes 502 is inclined, and the inclined end of the support plate 605 has a dovetail groove 6051. The trapezoidal block 604 is movably connected in the dovetail groove 6051. Pushing the outer shell 606 causes the outer shell 606 to drive the push rod 602 to move along the connecting pipe 601. The push rod 602 drives the push plate 603 to move. The push plate 603 drives the trapezoidal block 604 to move along the dovetail groove 6051, thereby causing the support plate 605 to move along the through holes 502 to the outside of the fixed core head 5. The support plate 605 moves into the fixing groove 102 of the upper sand mold 1, thereby fixing the sand core 4 on the upper sand mold 1. This also facilitates installation.

[0025] The fixed core head 5 is located at the center of the sand core 4; while the positioning core head 7 is provided in several places and is evenly distributed around the fixed core head 5; the positioning core head 7 can position the sand core 4, and at the same time make the through hole 502 on the side wall of the fixed core head 5 correspond to the fixing groove 102 on the upper sand mold 1, so as to facilitate the fixing mechanism 6 to fix the sand core 4.

[0026] The outer shell 606 is provided with several evenly distributed insertion slots I 6062, and the side wall of the sand core 4 is provided with several evenly distributed insertion slots II 402. Insertion slots I 6062 and insertion slots II 402 correspond to each other. An "L"-shaped plate 607 is inserted into the insertion slots I 6062 and insertion slots II 402. The "L"-shaped plate 607 is installed inside the insertion slots I 6062 and insertion slots II 402 by insertion, which can fix the outer shell 606 on the sand core 4 and prevent the outer shell 606 from slipping off.

[0027] The sand core 4 has a limiting groove 401 on its side wall and a limiting plate 6061 on its inner side wall. The limiting plate 6061 is inserted into the limiting groove 401, which can prevent the outer shell 606 from rotating along the sand core 4, thereby causing the insertion groove I 6062 and the insertion groove II 402 to not correspond, further affecting the fixation of the sand core 4.

[0028] A core positioning mechanism in a precision sand casting mold operates as follows: First, a sand core 4 with a fixed core 5 and a positioning core 7 is installed on the upper sand mold 1. Then, the outer shell 606 is pushed, causing the outer shell 606 to move the push rod 602 along the connecting pipe 601. The push rod 602 moves the push plate 603, which in turn moves the trapezoidal block 604 along the dovetail groove 6051. This causes the support plate 605 to move along the through hole 502 towards the outside of the fixed core 5. The support plate 605 moves into the fixing groove 102 of the upper sand mold 1, thus fixing the sand core 4 on the upper sand mold 1 and facilitating installation. Then, the upper sand mold 1 and the lower sand mold 2 are closed, and casting is performed.

[0029] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, the connection methods are divided into fixed connection and movable connection. Fixed connection methods include, but are not limited to, welding and bolting; movable connection methods include, but are not limited to, sliding connection, rotating connection and threaded connection. The connection method to achieve the desired effect should be selected according to the application of the solution.

[0031] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A core positioning mechanism in a precision sand casting mold, comprising an upper sand mold, a lower sand mold, a cavity, a sand core, a fixed core, a fixing mechanism, and a positioning core; characterized in that... The upper sand mold is located on top of the lower sand mold. Both the upper and lower sand molds have cavities inside. The top of the cavity of the upper sand mold has a positioning hole. The sand core is installed inside the cavity. The fixed core head and the positioning core head are both fixed on the top of the sand core and connected to the positioning hole of the upper sand mold. The fixing mechanism is installed inside the sand core and the fixed core head and passes through the fixed core head to connect with the upper sand mold. The fixing mechanism includes a connecting pipe, a push rod, a push plate, a trapezoidal block, a support plate, and a housing; the connecting pipe is fixed inside the sand core, and a connecting groove is provided inside the connecting pipe, which penetrates the connecting pipe; the housing is located outside the sand core, and an installation groove is provided inside the fixing core head, which communicates with the connecting groove; one end of the push rod is connected to the housing, and the other end is inserted into the connecting pipe; The push plate is fixed to one end of the push rod located inside the connecting tube; several trapezoidal blocks are provided and are evenly fixed on the side wall of the push plate; several evenly distributed fixing grooves are provided in the positioning hole connecting the upper core and the fixed core head, and several through holes are provided on the side wall of the fixed core head, with the fixing grooves corresponding to the through holes; several support plates are provided, with the support plates located inside the through holes, and the end of the support plate away from the through holes is inclined, with a dovetail groove at the inclined end of the support plate; the trapezoidal blocks are movably connected in the dovetail groove.

2. The core positioning mechanism in a precision sand casting mold according to claim 1, characterized in that... The fixed core head is located at the center of the sand core; while the positioning core heads are provided in several places, and are evenly distributed around the fixed core head.

3. The core positioning mechanism in a precision sand casting mold according to claim 1, characterized in that... The outer shell is provided with several evenly distributed insertion slots I, and the sand core sidewall is provided with several evenly distributed insertion slots II. Insertion slots I and II correspond to each other, and the "L"-shaped plate is inserted into the insertion slots I and II.

4. The core positioning mechanism in a precision sand casting mold according to claim 1, characterized in that... The sand core has a limiting groove on its side wall and a limiting plate on its inner side wall, with the limiting plate inserted inside the limiting groove.

Images