A single-machine one-mold two-cavity core making tool

Abstract

The application relates to the technical field of core-making tooling, in particular to a single-machine one-mold two-cavity core-making tooling which comprises sand shooting tooling, air blowing tooling and a core-making machine table top, the top of the core-making machine table top is provided with a base, positioning holes are arranged at the four corners of the bottom plate, and the top of the core is provided with an upper mold fixing plate. The base and the upper mold fixing plate are arranged, the sand shooting and air blowing processes in a single core-making cycle can be simultaneously used to operate two cavities, two sand cores with the same structure can be simultaneously produced in one equipment operation cycle, the production bottleneck problem caused by insufficient production capacity is solved, the air cylinder, the clamping plate, the fixing bolt I, the positioning column and the positioning hole are arranged, the use frequency of special tools and the labor intensity of operators are reduced, the downtime required for tooling replacement is shortened, and therefore the comprehensive utilization rate and production flexibility of a single core-making machine are improved.

Description

Technical Field

[0001] This invention belongs to the field of core-making tooling technology, specifically relating to a single-machine, two-cavity core-making tooling. Background Technology

[0002] In the foundry industry, sand cores are key components for forming the internal cavities and complex shapes of castings. Currently, many small and medium-sized foundry workshops use a single core-making machine for production, generally employing a one-mold-one-cavity core box fixture, meaning that only one sand core can be produced per sand injection molding cycle. With the increase in production pace and batch orders, the efficiency of this traditional core-making method has become a production bottleneck. In order to improve the output rate of a single machine, it is urgent to develop a core-making fixture that can achieve simultaneous production of two cavities without changing the main machine structure. In addition, when changing the core box of the traditional fixture, it is usually necessary to manually use multiple tools for tedious positioning, alignment and bolt tightening, which takes a long time and affects the overall utilization rate of the equipment. Therefore, we propose a single-machine one-mold-two-cavity core-making fixture. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a single-machine, two-cavity core-making fixture, so as to solve the problem mentioned in the background art that only one sand core can be produced in each sand injection molding cycle. When changing the core box of traditional fixtures, it is usually necessary to manually use multiple tools for tedious positioning, alignment and bolt tightening, which results in long mold change time and affects the overall utilization rate of the equipment.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a single-machine, two-cavity core-making fixture, comprising a sand-shooting fixture, an air-blowing fixture, and a core-making machine table. Two sets of nozzles are fixedly connected to the bottom of the sand-shooting fixture, and two sets of nozzles are fixedly connected to the bottom of the air-blowing fixture. Fixing blocks are fixedly connected to both sides of the top of the core-making machine table. Cylinders are fixedly connected to the surfaces of the fixing blocks. A locking plate is fixedly connected to the output end of the cylinders. Guide rods are fixedly connected to the front and rear ends of one side of the locking plate. A limit block is fixedly connected to one side of the guide rod. A fixing bolt is rotatably connected to the top of the inner surface of the locking plate. The top of the core-making machine table... The core-making machine has four sets of positioning columns symmetrically fixedly connected. A base is installed on the top of the core-making machine table. A core assembly is fixedly connected to the top of the base. Two lower cavities are opened on the top of the core assembly. Sand injection nozzles are opened on the top of the lower cavities. Four guide columns are fixedly connected to the top of the core assembly. A base plate is fixedly connected to the bottom of the core assembly. Positioning holes are opened at the four corners of the base plate. An upper mold fixing plate is set on the top of the core assembly. Two upper cavities are opened at the bottom of the upper mold fixing plate. Pre-embedded sandblasting nozzles are fixedly connected to the bottom of the upper cavities. Four circular grooves are opened at the bottom of the upper mold fixing plate. Guide sleeves are fixedly connected inside the circular grooves.

[0005] Preferably, the positions of the two sets of lower cavities correspond to the positions of the two sets of upper cavities, the radius of the guide post is equal to the radius of the guide sleeve, the four sets of guide posts and the four sets of circular grooves are circumferentially equidistantly arranged, and the guide posts are slidably connected inside the guide sleeve.

[0006] Preferably, the pre-embedded sandblasting nozzle is slidably connected inside the sandblasting port, and the positions of the two sets of nozzle one and the two sets of nozzle two correspond to the two sets of upper cavities. The nozzle one and the nozzle two are slidably connected to the top of the pre-embedded sandblasting nozzle.

[0007] Preferably, the radius of the positioning post is equal to the radius of the positioning hole, the positioning post is slidably connected in the positioning hole, and the base plate is slidably connected to the top of the core-making machine table through the cooperation of the positioning post and the positioning hole.

[0008] Preferably, the cylinder is electrically connected to an external power source.

[0009] Preferably, the surface of the fixing block is provided with a second circular groove, the guide rod is slidably connected in the second circular groove, and the radius of the limiting block is greater than the radius of the guide rod.

[0010] Preferably, the locking plate is in the shape of an inverted L, and the locking plate engages with both sides of the base plate. The top of both sides of the base plate is provided with a threaded groove, and the fixing bolt passes through the top of the locking plate and is rotatably connected in the threaded groove.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. This single-machine, two-cavity core-making fixture is equipped with a base and an upper mold fixing plate. By improving the traditional one-cavity core box into an integrated one-cavity structure, two independent cavity structures are designed within the same core box and the same upper mold fixing plate. Specifically, this is reflected in the two sets of lower cavities on the core box and the two sets of upper cavities on the upper mold fixing plate. When the upper mold fixing plate guides the mold closing through the guide sleeve and the guide post on the core box, each pair of corresponding upper and lower cavities forms a complete sand core forming space. This allows the sand shooting and air blowing processes in a single core-making cycle to operate the two cavities simultaneously through the two sets of nozzles one of the sand shooting fixture and the two sets of nozzles two of the air blowing fixture. Thus, two sand cores with identical structures can be produced simultaneously within one equipment operation cycle. While keeping the original sand shooting, curing, and mold opening cycle unchanged, the theoretical output efficiency of the single machine is directly doubled. This effectively solves the production bottleneck problem caused by insufficient capacity of a single core-making machine in small and medium-sized production, and realizes the expansion of production capacity without purchasing additional main equipment.

[0013] 2. This single-machine, two-cavity core-making fixture is equipped with a cylinder, a clamping plate, a fixing bolt, a positioning post, and positioning holes. It consists of a positioning post for coarse positioning, positioning holes on the base plate, a cylinder providing active clamping force, an inverted L-shaped clamping plate directly driven by the cylinder, and a fixing bolt for final locking. When changing fixtures, the operator simply uses a hoisting device to lift the entire base (including the core assembly, etc.) above the core-making machine table, roughly aligning the positioning holes on the bottom of the base plate with the positioning posts on the table before lowering it. With gravity and a conical guide, the positioning post automatically slides into the positioning hole to complete precise initial positioning. Then, the cylinder is activated, its piston rod extends, pushing the clamping plate along the guide rod. The machine moves horizontally in a predetermined direction, allowing the horizontal arm of the clamping plate to cover and press against the top edge of the base plate, achieving automated initial clamping and pre-pressing. Finally, only a few fixing bolts need to be screwed through the clamping plate into the threaded groove of the base plate using a tool to complete the final rigid locking. This series of operations simplifies the complex process of multi-directional alignment and manual tightening of a large number of bolts in the traditional replacement method into three quick steps: "lifting and positioning - pneumatic clamping - tightening of a few bolts". This significantly reduces the frequency of use of special tools and the labor intensity of operators, and significantly shortens the downtime required for tooling replacement, thereby improving the overall utilization rate and production flexibility of a single core-making machine. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the various components of the present invention;

[0015] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0016] Figure 3 This is a three-dimensional structural schematic diagram of the sand-shooting fixture and the air-blowing fixture of the present invention;

[0017] Figure 4 This is a three-dimensional structural schematic diagram of the base of the present invention;

[0018] Figure 5 This is an exploded view of the structure of the core-making machine table and base of the present invention;

[0019] Figure 6 This is an exploded view of the structure of the core-making machine table and base of the present invention;

[0020] Figure 7 This is a bottom view of the structure of the upper mold fixing plate of the present invention.

[0021] In the diagram: 1. Sand-shooting fixture; 11. Nozzle 1; 2. Air-blowing fixture; 21. Nozzle 2; 3. Core-making machine table; 31. Fixing plate; 32. Cylinder; 33. Clamping plate; 34. Guide rod; 35. Limiting block; 36. Fixing bolt 1; 37. Positioning post; 4. Base; 41. Core assembly; 42. Lower cavity; 43. Sand-shooting nozzle; 44. Guide post; 45. Base plate; 46. Positioning hole; 5. Upper mold fixing plate; 51. Upper cavity; 52. Pre-embedded sand-shooting nozzle; 53. Circular groove 1; 54. Guide sleeve. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-7 One embodiment provided by the present invention:

[0024] A single-machine, two-cavity core-making fixture includes a sand-shooting fixture 1, an air-blowing fixture 2, and a core-making machine table 3. Two sets of nozzles 11 are fixedly connected to the bottom of the sand-shooting fixture 1. Two sets of nozzles 21 are fixedly connected to the bottom of the air-blowing fixture 2. Fixing blocks 31 are fixedly connected to both sides of the top of the core-making machine table 3. Cylinders 32 are fixedly connected to the surface of the fixing blocks 31. A locking plate 33 is fixedly connected to the output end of the cylinders 32. Guide rods 34 are fixedly connected to the front and rear ends of one side of the locking plate 33. A limit block 35 is fixedly connected to one side of the guide rods 34. A fixing bolt 36 is rotatably connected to the top of the inside of the locking plate 33. Four sets of positioning posts 37 are symmetrically fixedly connected to the top of the core-making machine table 3. A base 4 is installed on the top of the core-making machine table 3. The top of the base 4 is fixed... The core assembly 41 is connected to the mold. Two lower cavities 42 are formed at the top of the core assembly 41, and sand-blasting nozzles 43 are formed at the top of each lower cavity 42. Four guide pillars 44 are fixedly connected to the top of the core assembly 41. A base plate 45 is fixedly connected to the bottom of the core assembly 41, and positioning holes 46 are formed at the four corners of the base plate 45. An upper mold fixing plate 5 is set at the top of the core assembly 41. Two upper cavities 51 are formed at the bottom of the upper mold fixing plate 5, and pre-embedded sand-blasting nozzles 52 are fixedly connected to the bottom of each upper cavity 51. Four circular grooves 53 are formed at the bottom of the upper mold fixing plate 5, and guide sleeves 54 are fixedly connected inside the circular grooves 53. A base 4 and an upper mold fixing plate 5 are also provided. By improving the traditional one-cavity core box into an integrated two-cavity structure, two independent cavity structures are designed in the same... Within a single core assembly 41 and the same upper mold fixing plate 5, specifically manifested in the two sets of lower cavities 42 opened on the core assembly 41 and the two sets of upper cavities 51 opened on the upper mold fixing plate 5, after the upper mold fixing plate 5 is guided by the guide sleeve 54 and the guide post 44 on the core assembly 41 to close the mold, each pair of corresponding upper cavities 51 and lower cavities 42 forms a complete sand core forming space. This allows the sand shooting and air blowing processes of a single core making cycle to operate on the two cavities simultaneously through the two sets of nozzles 11 of the sand shooting fixture 1 and the two sets of nozzles 21 of the air blowing fixture 2. Thus, two sand cores with identical structures can be produced simultaneously within one equipment operation cycle. Under the condition that the original sand shooting, curing, and mold opening cycle of the equipment remains unchanged, the theoretical output efficiency of a single machine is directly increased. This design effectively solves the production bottleneck problem caused by insufficient capacity of a single core-making machine in small and medium-scale production, enabling capacity expansion without purchasing additional main equipment. It is equipped with a cylinder 32, a clamping plate 33, a fixing bolt 36, a positioning post 37, and a positioning hole 46. The system consists of the positioning post 37 for coarse positioning, the positioning hole 46 on the base plate 45 of the base 4, the cylinder 32 providing active clamping force, the inverted L-shaped clamping plate 33 directly driven by the cylinder 32, and the fixing bolt 36 for final locking. When changing tooling, the operator only needs to use a hoisting device to lift the entire base 4 (including the core assembly 41, etc.) above the core-making machine table 3, roughly align the positioning hole 46 at the bottom of the base plate 45 with the positioning post 37 on the table, and then lower it.With the aid of gravity and a conical guide, the positioning pin 37 automatically slides into the positioning hole 46 to complete precise initial positioning. Then, the cylinder 32 is activated, its piston rod extending to push the locking plate 33 horizontally along the direction defined by the guide rod 34. This causes the horizontal arm of the locking plate 33 to cover and press against the top edge of the base plate 45, achieving automated initial clamping and pre-pressing. Finally, only a few fixing bolts 36 need to be screwed through the locking plate 33 into the threaded groove of the base plate 45 using tools to complete the final rigid locking. This series of operations simplifies the complex process of multi-directional alignment and manual tightening of numerous bolts in traditional replacement methods into three rapid steps: "lifting and positioning - pneumatic clamping - tightening of a few bolts." This significantly reduces the frequency of using specialized tools and the labor intensity of operators, and significantly shortens the downtime required for tooling changes, thereby improving the overall utilization rate and production flexibility of a single core-making machine.

[0025] Furthermore, the positions of the two sets of lower cavities 42 correspond to the positions of the two sets of upper cavities 51 respectively. When the upper mold fixing plate 5 and the core assembly 41 are closed, the upper and lower cavities together form two complete and independent sand core cavities. The radius of the guide post 44 is equal to the radius of the guide sleeve 54. The four sets of guide posts 44 and the four sets of circular grooves 53 are all circumferentially equidistantly arranged. The guide posts 44 are slidably connected in the guide sleeve 54. The symmetrically arranged guide post 44 and guide sleeve 54 guiding system ensures that the upper mold and the lower mold always maintain precise alignment during the mold closing process, preventing cavity misalignment. This is the basic guarantee for producing sand cores with accurate dimensions.

[0026] Furthermore, the pre-embedded sandblasting nozzle 52 is slidably connected inside the sand-shooting port 43, forming a sealed transition channel from the outside of the tooling to the inside of the cavity. The positions of the two sets of nozzle 11 and the two sets of nozzle 21 correspond to the two sets of upper cavities 51. Nozzle 11 and nozzle 21 are slidably connected to the top of the pre-embedded sandblasting nozzle 52. The nested connection method allows the sand-shooting tooling 1 and the air-blowing tooling 2 to accurately and directly introduce sand or airflow into the cavity through the pre-embedded sandblasting nozzle 52 as an intermediary, avoiding sand mold defects or gas leakage caused by misalignment in the traditional method, and improving process stability and raw material utilization.

[0027] Furthermore, the radius of the positioning post 37 is equal to the radius of the positioning hole 46. The positioning post 37 is slidably connected in the positioning hole 46. The base plate 45 is slidably connected to the top of the core-making machine table 3 through the cooperation of the positioning post 37 and the positioning hole 46, forming a primary precision positioning system between the tooling and the machine tool. When the base 4 is hoisted and placed, the positioning post 37 can guide the positioning hole 46 to automatically align, ensuring that the base 4 quickly and accurately reaches the predetermined working position, providing a reliable prerequisite for subsequent clamping actions.

[0028] Furthermore, the cylinder 32 is electrically connected to an external power source, and its extension and retraction actions can be automated through circuit control. This is the core driving part for realizing the tooling's rapid clamping and release function.

[0029] Furthermore, a circular groove is formed on the surface of the fixing block 31, and the guide rod 34 is slidably connected in the circular groove. The radius of the limiting block 35 is larger than the radius of the guide rod 34. The circular groove provides a stable and straight running track for the guide rod 34, preventing the locking plate 33 from swaying during movement. The limiting block 35 effectively limits the maximum stroke of the locking plate 33 by contacting the side of the fixing block 31, preventing it from moving excessively and damaging the mechanism or tooling, thus playing a role in mechanical safety protection.

[0030] Furthermore, the locking plate 33 is inverted L-shape, and the locking plate 33 and the two sides of the base plate 45 are interlocked. The top of the two sides of the base plate 45 is provided with threaded grooves. The fixing bolts 36 pass through the top of the locking plate 33 and are rotatably connected in the threaded grooves. The inverted L-shaped locking plate 33 can hook the edge of the base plate 45 from above. When the cylinder 32 pushes the locking plate 33 to move towards the base 4, the horizontal arm of the locking plate 33 will press tightly against the top surface of the base plate 45, providing a strong pre-tightening downward pressure. Then, the fixing bolts 36 are screwed in, which can further rigidly connect the locking plate 33 and the base plate 45, forming a double locking mechanism. This ensures that the base 4 can withstand the high pressure and vibration of sand shooting during the production process without loosening, which greatly enhances the stability and safety of the tooling operation.

[0031] Working principle: During the installation phase, the assembled base 4 (including core assembly 41, base plate 45, etc.) is first placed stably on the top of the core-making machine table 3 using hoisting equipment. During placement, ensure that the four positioning holes 46 on the bottom plate 45 of the base 4 are roughly aligned with the four protruding positioning posts 37 on the core-making machine table 3. Then, slowly lower it. Under gravity, the positioning posts 37 will naturally slide into the positioning holes 46, completing the initial precise positioning of the tooling. Subsequently, the operator activates the cylinder 32, extending the piston rod of the cylinder 32 and pushing the connected locking plate 33 along the guide rod 34. The direction is such that the L-shaped locking plate 33 moves towards the side of the base plate 45 of the base 4. Its horizontal portion moves above the top surface of the base plate 45, while its vertical portion remains close to the side of the base plate 45. When the locking plate 33 reaches the predetermined position (limited by the limiting block 35), its horizontal arm completely covers the edge of the base plate 45. At this point, using a tool, the fixing bolt 36 is passed through the through hole at the top of the locking plate 33 and screwed into the pre-machined threaded groove at the top of the base plate 45. A final tightening force is applied, thus firmly locking the base 4 onto the core-making machine table 3, completing the installation of the lower mold assembly. Next... Install the upper mold part. Align the upper mold fixing plate 5 with the four guide sleeves 54 at its bottom and the four guide posts 44 fixed on the core assembly 41. Then lower it, and the guide posts 44 will slide smoothly into the guide sleeves 54 until the bottom surface of the upper mold fixing plate 5 is completely in contact with the top surface of the core assembly 41. At this time, the lower end of the pre-embedded sandblasting nozzle 52 fixed on the upper mold fixing plate 5 is also inserted into the sand injection port 43 on the core assembly 41, completing the connection of the sand injection / air blowing channel. Finally, fix the upper part of the upper mold fixing plate 5 to the moving template of the core making machine. During the production stage, the core making machine drives the upper mold fixing plate 5 and the core assembly 41. When the mold is closed and the upper and lower cavities are shut, the actuator of the core-making machine first moves the sand-shooting fixture 1 so that the two sets of nozzles 11 at its bottom are inserted downward into the top inlets of the two pre-embedded sand-blasting nozzles 52 to perform high-pressure sand-shooting. The resin sand fills the two cavities. After the sand-shooting is completed, the sand-shooting fixture 1 retracts, and the air-blowing fixture 2 moves to the same position. Its two sets of nozzles 21 are also inserted into the pre-embedded sand-blasting nozzles 52 to blow curing gas into the sand core in the cavity to harden it. After curing is completed, the air-blowing fixture 2 retracts, the core-making machine opens the mold, the upper mold fixing plate 5 rises, and the two sand cores that have been made can be taken out, completing one work cycle.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A single-machine, two-cavity core-making fixture, comprising a sand-shooting fixture (1), an air-blowing fixture (2), and a core-making machine table (3), characterized in that: The bottom of the sand-shooting fixture (1) is fixedly connected to two sets of nozzles (11), the bottom of the air-blowing fixture (2) is fixedly connected to two sets of nozzles (21), the top two sides of the core-making machine table (3) are fixedly connected to fixed blocks (31), the surface of the fixed blocks (31) is fixedly connected to cylinders (32), the output end of the cylinders (32) is fixedly connected to a locking plate (33), the front and rear ends of one side of the locking plate (33) are fixedly connected to guide rods (34), one side of the guide rods (34) is fixedly connected to a limit block (35), the top of the inside of the locking plate (33) is rotatably connected to a fixing bolt (36), the top of the core-making machine table (3) is symmetrically fixedly connected to four sets of positioning columns (37), and the top of the core-making machine table (3) is equipped with a base (4). The top of the base (4) is fixedly connected to a core assembly (41), the top of the core assembly (41) is provided with two sets of lower cavities (42), the top of the lower cavities (42) is provided with sand-shooting nozzles (43), the top of the core assembly (41) is fixedly connected with four sets of guide pillars (44), the bottom of the core assembly (41) is fixedly connected to a base plate (45), the four corners of the base plate (45) are provided with positioning holes (46), the top of the core assembly (41) is provided with an upper mold fixing plate (5), the bottom of the upper mold fixing plate (5) is provided with two sets of upper cavities (51), the bottom of the upper cavities (51) is fixedly connected with pre-embedded sand-blasting nozzles (52), the bottom of the upper mold fixing plate (5) is provided with four sets of circular grooves (53), and the inside of the circular grooves (53) is fixedly connected with guide sleeves (54).

2. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The positions of the two sets of lower cavities (42) correspond to the positions of the two sets of upper cavities (51) respectively. The radius of the guide post (44) is equal to the radius of the guide sleeve (54). The four sets of guide posts (44) and the four sets of circular grooves (53) are circumferentially equidistantly arranged. The guide post (44) is slidably connected inside the guide sleeve (54).

3. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The pre-embedded sandblasting nozzle (52) is slidably connected inside the sandblasting port (43). The positions of the two sets of nozzle one (11) and the two sets of nozzle two (21) are corresponding to the two sets of upper cavities (51). The nozzle one (11) and the nozzle two (21) are slidably connected to the top of the pre-embedded sandblasting nozzle (52).

4. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The radius of the positioning post (37) is equal to the radius of the positioning hole (46). The positioning post (37) is slidably connected in the positioning hole (46). The base plate (45) is slidably connected to the top of the core-making machine table (3) through the cooperation of the positioning post (37) and the positioning hole (46).

5. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The cylinder (32) is electrically connected to an external power source.

6. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The surface of the fixing block (31) is provided with a circular groove, the guide rod (34) is slidably connected in the circular groove, and the radius of the limiting block (35) is greater than the radius of the guide rod (34).

7. The single-machine, two-cavity core-making fixture according to claim 1, characterized in that: The locking plate (33) is in the shape of an inverted L. The locking plate (33) and the two sides of the base plate (45) are locked together. The top of the two sides of the base plate (45) are provided with threaded grooves. The fixing bolt (36) passes through the top of the locking plate (33) and is rotatably connected in the threaded groove.

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