A sand casting box positioning device

Abstract

This utility model relates to the field of sand casting technology and discloses a sand casting mold box positioning device, including a lower sand mold box and an upper sand mold box. The bottom surface of the upper sand mold box is symmetrically provided with two sets of conical positioning pins. The lower sand mold box has conical positioning grooves at corresponding positions. Reinforcing ribs are pre-embedded in the conical positioning pins. Two fixing columns are symmetrically fixed on both sides of the lower sand mold box and two fixing columns are symmetrically fixed on both sides of the upper sand mold box. A locking assembly is installed between the fixing columns. This utility model reduces the fitting gap between the upper and lower sand mold boxes, reduces the occurrence of misalignment, lowers the casting misalignment defect rate, and reduces the dimensional error of the mold box assembly. It eliminates the reliance on operator experience and visual observation, and the locking force distribution is more uniform, avoiding excessive force on one side and reducing uneven gaps in the sand mold box assembly, effectively reducing the risk of molten metal ignition.

Description

Technical Field

[0001] This utility model relates to the field of sand casting technology, specifically a sand casting box positioning device. Background Technology

[0002] Sand casting is one of the most widely used casting processes in industrial production. Its core principle is as follows: First, a sand mold adapted to the production needs of the casting is made. At the same time, according to the design requirements of the internal cavity or complex structure of the casting, a sand core is placed in the sand mold to form the internal cavity required by the casting. After the sand mold and sand core are prepared, a sand mold structure with a complete cavity is formed. Then, molten metal is slowly poured into the sand mold. The molten metal will flow along the cavity inside the sand mold, filling the external contour formed by the sand mold and the internal cavity reserved by the sand core. After the molten metal has completely cooled and solidified, the sand mold is disassembled and the sand core is removed, finally obtaining a shaped casting with a preset internal cavity or specific structure.

[0003] In the actual production process of sand casting, the positioning accuracy of the sand mold box directly determines the forming quality of the casting. Currently, the positioning process relies excessively on the operator's experience and visual observation to judge the accuracy of the box assembly. This manual positioning method is prone to misalignment of the upper and lower sand mold boxes, which in turn leads to casting defects caused by misalignment, affecting the dimensional accuracy and appearance quality of sand castings. Moreover, the positioning and locking processes are separated, and a combination of independent positioning pins and external wire locking is often used. This method is cumbersome to adapt to the sand casting operation process, and the assembly of a single sand mold box takes a long time, which restricts the improvement of sand casting production efficiency. In addition, the manual tightening of the wire can easily cause uneven distribution of locking force, and excessive force on one side often occurs. Uneven force will directly lead to uneven gap of the sand mold box joint, which will increase the risk of molten metal escaping during the sand casting pouring process, which not only threatens production safety but also further reduces the stability of the quality of sand castings.

[0004] Therefore, we propose a sand casting box positioning device to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a sand casting mold box positioning device to solve the problems mentioned in the background art. Existing devices rely heavily on the operator's experience and visual observation to judge the accuracy of mold box assembly, which easily leads to misalignment of the upper and lower mold boxes. Moreover, the positioning and locking operation process is cumbersome, and the assembly of a single sand mold box takes a long time, reducing work efficiency. Furthermore, manually tightening the iron wire can easily cause uneven distribution of locking force and excessive force on one side, resulting in uneven gaps in the sand mold box joints, increasing the risk of molten metal escaping and affecting both production safety and the stability of casting quality.

[0006] This utility model provides the following technical solution: a sand casting mold box positioning device, including a lower sand mold box and an upper sand mold box. The bottom surface of the upper sand mold box is symmetrically provided with two sets of conical positioning pins. The lower sand mold box has conical positioning grooves opened at corresponding positions. Reinforcing ribs are pre-embedded in the conical positioning pins. Fixed columns one is symmetrically fixed on both sides of the lower sand mold box, and fixed columns two is symmetrically fixed on both sides of the upper sand mold box. A locking assembly is installed between the fixed columns one and the fixed columns two.

[0007] Preferably, the conical positioning pin is provided in the shape of a pointed cone, and the conical positioning groove is adapted to the conical positioning pin.

[0008] Preferably, the locking assembly includes a first fixing rod fixed to the bottom surface of the second fixing post, a plug rod fixed to the bottom of the first fixing rod, and a second fixing rod fixed to the first fixing post.

[0009] Preferably, the fixing rod has a slot, the insertion rod is inserted into the slot, and the side wall of the insertion rod has a wedge-shaped groove.

[0010] Preferably, a mounting block is fixed to the side wall of the second fixing rod, a cavity is provided at the connection between the second fixing rod and the mounting block, a connecting rod is slidably connected to the side wall of the mounting block, a wedge block is fixed to one end of the connecting rod, and the wedge block is engaged with the wedge groove.

[0011] Preferably, a pull rod is fixed to the other end of the connecting rod, a spring is sleeved on the outer ring of the connecting rod, one end of the spring is fixedly connected to the side wall of the wedge block, and the other end of the spring is fixedly connected to the inner wall of the mounting block.

[0012] This utility model has the following beneficial effects:

[0013] This device improves positioning accuracy. Addressing the issues of loose sand mold texture, slight deviations in molding, and excessive reliance on manual positioning, it effectively reduces the mating gap between the upper and lower sand mold boxes by optimizing the positioning structure design. This significantly reduces the occurrence of misalignment between the upper and lower sand mold boxes, thereby lowering the defect rate of misaligned castings. At the same time, it effectively reduces the dimensional error of mold assembly, eliminating the reliance on operator experience and visual observation. This makes the mold assembly accuracy of sand casting more stable and reliable, effectively ensuring the dimensional accuracy and appearance quality of castings.

[0014] This device simplifies the sand casting box assembly process. Addressing the pain points of the original separate and cumbersome positioning and locking processes, it connects the positioning and locking processes, eliminating the need for tedious independent positioning and external wire locking operations. This shortens the assembly time for a single sand casting box, effectively solving the problem of production efficiency constraints imposed by the original method, and further improving the overall production efficiency of sand casting.

[0015] This device makes the locking force distribution more uniform, effectively solving the problems of uneven locking force and excessive force on one side caused by manually tightening the wire. It also reduces the uneven gap of the sand mold box joint, thereby effectively reducing the risk of molten metal escaping during sand casting. This not only improves the safety of the production process, but also further enhances the stability of the quality of sand castings and avoids quality fluctuation problems.

[0016] This device enhances the strength and rigidity of the positioning components. Addressing the issues of lateral shear force and easy breakage of positioning pins during the mold assembly process, it effectively resists lateral shear force during the assembly process, prevents positioning pin breakage, ensures the smooth progress of the sand casting mold assembly process, further reduces the casting scrap rate, and provides strong support for enterprises to improve overall production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0019] Figure 3 This is an overall sectional view of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the fixing post one, fixing post two, and locking assembly of this utility model.

[0021] Figure 5 For the present utility model Figure 4 Sectional view.

[0022] Figure 6 For the present utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0023] In the diagram: 1. Lower sand mold box; 101. Conical positioning groove; 2. Upper sand mold box; 201. Conical positioning pin; 202. Reinforcing rib; 3. Fixing post one; 31. Fixing post two; 4. Locking assembly; 41. Fixing rod one; 42. Insert rod; 43. Wedge groove; 44. Fixing rod two; 45. Slot; 46. Mounting block; 47. Cavity; 48. Spring; 49. Connecting rod; 410. Pull rod; 411. Wedge block. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: This example aims to address the problems of poor positioning accuracy, cumbersome and inefficient locking operations, uneven locking force distribution, and high risk of molten metal ignition during the traditional sand casting mold assembly process. Please refer to [link / reference]. Figure 1 - Figure 6 A sand casting mold box positioning device includes a lower sand mold box 1 and an upper sand mold box 2. The bottom surface of the upper sand mold box 2 is symmetrically provided with two sets of conical positioning pins 201. The lower sand mold box 1 has conical positioning grooves 101 at corresponding positions. Reinforcing ribs 202 are pre-embedded in the conical positioning pins 201. Fixed columns 1 3 are symmetrically fixed on both sides of the lower sand mold box 1, and fixed columns 2 31 are symmetrically fixed on both sides of the upper sand mold box 2. A locking assembly 4 is installed between the fixed columns 1 3 and the fixed columns 2 31.

[0026] The conical positioning pin 201 is set in a pointed cone shape, and the conical positioning groove 101 is adapted to the conical positioning pin 201.

[0027] The locking assembly 4 includes a fixing rod 41 fixed to the bottom surface of the fixing post 31, a plug rod 42 fixed to the bottom of the fixing rod 41, a fixing rod 44 fixed to the fixing post 31, a slot 45 formed in the fixing rod 44, the plug rod 42 being inserted into the slot 45, a wedge-shaped groove 43 formed on the side wall of the plug rod 42, a mounting block 46 fixed to the side wall of the fixing rod 44, a cavity 47 formed at the connection between the fixing rod 44 and the mounting block 46, and the mounting block 46 having a side... A connecting rod 49 is slidably connected to the wall. A wedge block 411 is fixed to one end of the connecting rod 49. The wedge block 411 is engaged with the wedge groove 43. A pull rod 410 is fixed to the other end of the connecting rod 49. The pull rod 410 is set in a semi-circular pull ring shape, which makes it easy for the operator to pull the connecting rod 49 by hand. A spring 48 is sleeved on the outer ring of the connecting rod 49. One end of the spring 48 is fixedly connected to the side wall of the wedge block 411, and the other end of the spring 48 is fixedly connected to the inner wall of the mounting block 46.

[0028] In this embodiment: When in use, the upper sand mold box 2 and the lower sand mold box 1 are prepared separately. After preparation, the upper sand mold box 2 and the lower sand mold box 1 are pre-treated to ensure that the internal cavity of the sand mold box is clean and free of debris, with complete outline and intact structure, so as to lay a solid foundation for the subsequent box assembly and pouring process.

[0029] Then, the box-closing process is initiated. The upper sand mold box 2 is hoisted to directly above the lower sand mold box 1, aligned with the reference position, and then slowly lowered. Two sets of symmetrically fixed long conical positioning pins 201 on the upper sand mold box 2 serve as guides. Their structure precisely matches the conical positioning grooves 101 on the surface of the lower sand mold box 1, guiding the upper sand mold box 2 and the lower sand mold box 1 to smoothly connect. The long conical positioning pins 201 increase the contact area of ​​the positioning surfaces, effectively preventing misalignment between the upper sand mold box 2 and the lower sand mold box 1. At the same time, their built-in metal reinforcing ribs 202 significantly improve their strength and rigidity, effectively resisting the lateral shear force generated during the box-closing process, preventing the positioning pins from breaking, and ensuring the stability and accuracy of the box-closing operation throughout the process.

[0030] During the closing process of the upper sand mold box 2, the insert rod 42 below the first fixing rod 41 is simultaneously inserted into the slot 45 inside the second fixing rod 44 on the upper sand mold box 2. Since the end face of the wedge block 411 installed on the side wall of the second fixing rod 44 through the connecting rod 49 is set in an inclined shape, when the insert rod 42 enters the slot 45, the bottom surface of the insert rod 42 will abut against the inclined block of the wedge block 411, thereby generating a pushing force on the wedge block 411, causing the wedge block 411 to slide into the cavity 47 under force. At the same time, the connecting rod 49 on the end side of the wedge block 411 will also simultaneously drive the pull rod 410 outward. Sliding and compressing the spring 48, as the insertion rod 42 continues to be inserted, the wedge block 411 slides completely into the cavity 47, and at the same time the insertion rod 42 and the slot 45 are completely in contact. At this time, the wedge block 411 is aligned with the wedge groove 43 on the insertion rod 42, the spring 48 is released from compression, the compressed spring 48 restores its elastic deformation, pushes the wedge block 411 out of the cavity 47 and precisely engages with the wedge groove 43 on the side wall of the insertion rod 42, firmly locking the insertion rod 42 and the fixing rod 44, forming the initial locking structure of the upper and lower sand mold box 1, ensuring that the position does not shift after the box is closed.

[0031] It should be noted that, based on the initial locking achieved by the locking component 4, iron wire can be wrapped between the first fixed post 3 and the second fixed post 31 for auxiliary reinforcement according to actual production needs. The mechanical precision locking of the locking component 4 and the physical reinforcement of the iron wire form a double fixing structure, so that the locking force is evenly distributed at the connection between the upper and lower sand mold boxes 1, avoiding uneven gaps in the joint due to excessive force on one side. From the structural design perspective, this significantly reduces the risk of molten metal escaping during subsequent pouring, and further improves the stability and safety of the casting process.

[0032] After the upper and lower sand mold boxes 1 are double-locked and the box closure accuracy is confirmed, molten metal is poured into the sand mold cavity formed by the closed upper sand mold box 2 and lower sand mold box 1. This ensures that the molten metal evenly fills all areas of the cavity, guaranteeing the quality of the casting. After pouring, the casting is left to stand for the molten metal to completely cool and solidify, forming the casting.

[0033] After the casting is formed, if iron wire was used for reinforcement, the wrapped iron wire must be removed first; if iron wire was not used for reinforcement, the pull rod 410 is pulled directly to make the wedge block 411 disengage from the wedge groove 43 on the side wall of the insert rod 42, thereby releasing the lock between the insert rod 42 and the fixing rod 44; then the upper sand mold box 2 and the lower sand mold box 1 are separated by hoisting equipment, and finally the box opening and sand dropping operation is carried out to take out the formed casting, thus completing the entire sand casting process of box closing, pouring, and forming.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A flask assembly positioning device for sand casting, comprising a lower sand flask (1) and an upper sand flask (2), characterized in that: The bottom surface of the upper sand mold box (2) is symmetrically provided with two sets of conical positioning pins (201). The lower sand mold box (1) is provided with conical positioning grooves (101) at corresponding positions. The conical positioning pins (201) are pre-embedded with reinforcing ribs (202). The lower sand mold box (1) is symmetrically fixed with fixing column one (3) on both sides. The upper sand mold box (2) is symmetrically fixed with fixing column two (31) on both sides. A locking assembly (4) is installed between fixing column one (3) and fixing column two (31).

2. A flask line positioning device for sand casting as defined in claim 1, wherein: The conical positioning pin (201) is provided in the shape of a pointed cone, and the conical positioning groove (101) is adapted to the conical positioning pin (201).

3. The sand casting mold assembly and positioning device according to claim 1, characterized in that: The locking assembly (4) includes a fixing rod (41) fixed to the bottom surface of the fixing post (31), a plug rod (42) fixed to the bottom of the fixing rod (41), and a fixing rod (44) fixed on the fixing post (3).

4. The sand casting mold assembly and positioning device according to claim 3, characterized in that: The fixing rod 2 (44) has a slot (45) inside, the insertion rod (42) is inserted into the slot (45), and the side wall of the insertion rod (42) has a wedge groove (43).

5. The sand casting mold assembly and positioning device according to claim 4, characterized in that: The side wall of the second fixing rod (44) is fixed with an installation block (46). A cavity (47) is provided at the connection between the second fixing rod (44) and the installation block (46). A connecting rod (49) is slidably connected to the side wall of the installation block (46). A wedge block (411) is fixed at one end of the connecting rod (49). The wedge block (411) is engaged with the wedge groove (43).

6. A sand casting mold assembly and positioning device according to claim 5, characterized in that: The other end of the connecting rod (49) is fixed with a pull rod (410), and a spring (48) is sleeved on the outer ring of the connecting rod (49). One end of the spring (48) is fixedly connected to the side wall of the wedge block (411), and the other end of the spring (48) is fixedly connected to the inner wall of the mounting block (46).

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