A fully automatic coated sand mold core clamping mechanism and use method thereof

Abstract

The present invention relates to the technical field of coated sand casting, specifically to a fully automatic coated sand mold core clamping mechanism and a method of using the same, comprising an upper clamping body and a lower clamping body, wherein the upper clamping body and the lower clamping body are combined to form a clamp for clamping the mold core, wherein the bottom end of the upper clamping body is provided with a pin, and the lower clamping body is provided with a slot that cooperates with the pin, and further comprises an automatic clamping device, wherein the lower clamping body is provided with an automatic clamping device, and when the mold core is installed in the mold, the automatic clamping device automatically clamps the mold core, and the automatic clamping device comprises a plurality of mounting bases installed on the lower clamping body. The present invention uses the automatic clamping device, and when the upper and lower molds of the casting mold are closed, the spring sheet can automatically clamp the pressing block on the surface to be clamped of the mold core, thereby realizing the automatic clamping of the mold core and improving the clamping efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of coated sand casting, in particular to a full-automatic coated sand mold core clamping mechanism and a use method thereof. Background Art

[0002] Coated sand mold core is one of the commonly used mold core types in casting processing. For mold cores that need to be fixed with a clamp, workers usually need to install them manually.

[0003] The process of manually installing the clamp is specifically that, before casting, the core is first installed on the mold, and then the worker installs the clamp on the mold by threaded connection, and the clamp tightly fixes the core in its installation position by screwing the threads. Moreover, in order to make the clamping force on the core uniform and thus ensure the clamping effect of the clamp, the existing clamp clamping scheme usually uses multiple clamping mechanisms symmetrically for the same clamping surface of the core. This means that when the worker manually installs the clamp, the same clamping surface needs to be mechanically repeated many times, and as the number of clamping surfaces of the core increases, the number of such mechanical repeated operations will also increase. In addition, after the casting is completed, the core clamp needs to be disassembled by repeated threaded connection and disassembly. It is not difficult to see that this has a serious negative impact on the production efficiency of casting. Therefore, the automation of the core clamping mechanism has practical significance.

[0004] However, for the core clamp, its working environment is usually accompanied by high temperature. Therefore, if electronic components and hydraulic transmission parts are used to achieve automatic clamping, high requirements are placed on the design scheme and components. Otherwise, the stability and reliability of the equipment will be greatly reduced.

[0005] To this end, a fully automatic coated sand mold core clamping mechanism and a use method thereof are proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a fully automatic coated sand mold core clamping mechanism and its use method, which uses an automatic clamping device to automatically clamp the mold core installed in the mold in a purely mechanical structure during the casting process to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A fully automatic coated sand mold core clamping mechanism and a method of using the same, comprising:

[0009] The upper clamp is concrete, the lower clamp is concrete;

[0010] The upper clamp body and the lower clamp body are combined to form a fixture for clamping the mold core;

[0011] The upper clamp body is provided with a pin at the bottom end, and the lower clamp body is provided with a slot that cooperates with the pin.

[0012] Also includes:

[0013] The automatic clamping device is arranged on the lower clamping body, and when the mold core is installed in the mold, the automatic clamping device automatically clamps the mold core.

[0014] The automatic clamping device includes a plurality of mounting bases mounted on the lower clamping body, and the plurality of mounting bases can all rotate relative to the lower clamping body, and each mounting base is installed with a spring sheet for providing a clamping force, and a through hole is provided on the lower clamping body, and a pressure block for transmitting the clamping force is installed in the through hole, and the plurality of spring sheets cooperate with the pressure block, and a plurality of push blocks for pushing the mounting base to rotate are installed in the lower clamping body, and the plurality of push blocks cooperate with the pins in a wedge shape, and a plurality of slide grooves 1 cooperating with the push blocks are provided in the lower clamping body, and the push blocks are installed in the slide groove 1, and the push blocks cooperate with the slide groove 2.

[0015] Several points worth explaining in advance are: first, the upper clamp and the lower clamp are respectively installed on the upper mold and the lower mold, so when the upper and lower molds are closed, the upper clamp and the lower clamp will also be matched; second, the present invention can use multiple at the same time to ensure the clamping effect, and the specific number of uses depends on the number of surfaces of the mold core to be clamped; third, in order to enable the mounting base to rotate relative to the lower clamp, it can be achieved by installing a support on the lower clamp and then rotatably installing the mounting base on the support in an analogous manner to the installation method of a single door. At this time, the mounting base can use the connection between it and the support as a rotating axis to rotate relative to the lower clamp. It should be noted in particular that no matter how it is installed, the spring should be able to smoothly transfer the clamping force to the pressure block; fourthly, sliding friction needs to occur frequently between the push block and the slide groove one, therefore, the push block surface and the side wall of the slide groove one should be properly surface treated to improve their wear resistance, such as chrome plating, carburizing, etc.; fifthly, considering that the working environment of the push block and the slide groove one is the dusty environment of casting processing, in order to ensure that the sliding relationship between the push block and the slide groove one is not damaged by external dust, appropriate protective measures should be taken, for example, appropriately increase the fitting clearance between the push block and the slide groove one, and use a high-pressure air nozzle to clean the dust on the surface of the fixture after the casting is unloaded and the mold is separated.

[0016] Based on this scheme, the overall working process of the present invention will be described in detail below. First, the mold core is installed on the lower mold. At this time, the end face of the pressure block will be aligned with the surface to be clamped of the mold core, and the spring piece is in a naturally relaxed state. At the same time, the end of the push block close to the lower mold extends into the slot, so that the pin can cooperate with the push block during the insertion of the slot; in the next step, the upper mold moves downward under the action of external force and gradually closes the mold with the lower mold. During this process, the pin is gradually inserted into the slot, and through the wedge-shaped matching relationship with the push block, the push block is pushed along the slide groove toward the end away from the mold. Then, the push block will push the mounting base to rotate the mounting base, and then press the spring piece onto the end face of the pressure block that matches it, and at this time, the mounting base continues to rotate, so the spring piece is released. The upper and lower molds are then closed, and the pins and slots are fully matched, and the upper clamping body and the lower clamping body are also matched to form a clamp. At this time, the push block is limited by the pins and cannot move in the direction close to the mold in the slide groove. Therefore, even if the mounting base is affected by the elastic force of the spring sheet, it cannot rotate, so that the elastic force of the spring sheet can be maintained all the time, ensuring that the pressure block can be pressed tightly against the surface of the mold core to be clamped, realizing the automatic clamping of the mold core and improving the clamping efficiency.

[0017] As a preferred solution of the present invention, the spring piece is made of spring steel.

[0018] A limiting platform is arranged on the pin, and the limiting platform cooperates with the push block. A second slide groove cooperates with the limiting platform, and the push block cooperates with the second slide groove.

[0019] During the casting production process, the spring clip will have to work in a high temperature environment. Therefore, the spring clip needs to have a certain high temperature resistance to ensure that the spring clip can correctly play its role in applying the clamping force. By selecting the spring clip material as spring steel, the spring clip can play its role correctly at an ambient temperature of up to 1000°C, thereby improving the reliability of the present invention.

[0020] In addition, by setting a limit table and its matching relationship with the push block, the force condition of the pin can be improved, the service life of the pin can be extended, and the reliability of the present invention can be improved. The specific reasons are introduced below: when the pin pushes the push block along the slide groove to the end away from the mold, and then the spring sheet presses the pressing block against the surface of the mold core to be clamped, in this process, due to the mutuality of force, the pin will also be subjected to an extrusion force in the direction of the mold, and this extrusion force will make the pin have a tendency to bend in the direction of the mold, and this extrusion force will appear and disappear periodically during the repeated clamping process. At the same time, the pin will continue to be subjected to the extrusion force during the entire process from mold closing to mold separation. As for the pin, it is in the shape of an outwardly extending rod. Therefore, when subjected to the periodic action of the extrusion force, the specific connection part between the pin and the upper clamp , that is, the root of the pin, will easily produce fatigue damage due to periodic stress changes, which will cause the device of the present invention to fail to work normally. Therefore, a limit platform is set; through the limit platform, when the pin is fully inserted into the slot, the limit platform cooperates with the push block. At this time, the elastic force of the spring piece will be applied to the limit platform through the push block, and the limit platform will transfer the force to the lower clamp body through its relationship with the second slide groove. Because the lower clamp body is installed on the lower mold, the elastic force of the spring piece will bypass the pin under this series of transmission effects and be transferred to the lower mold. Therefore, the force-bearing time of the pin in the entire casting process is greatly shortened, and the force-bearing condition is improved.

[0021] As a preferred solution of the present invention, the spring piece is installed on the mounting base by threaded connection.

[0022] The spring sheet is provided with a scale, and the mounting base is provided with a scale pointer that cooperates with the scale. The scale and the scale pointer are used together to display the clamping force provided by the spring sheet.

[0023] The reason for designing this solution is that the high-temperature compressive strength of the coated sand mold core is limited. For example, the compressive strength of ordinary coated sand at 1000°C is less than 0.2MPa. Therefore, when installing the clamp, controlling the clamping force is important for ensuring production quality. Specifically, on the one hand, if the clamping force is too large, the mold core may be damaged during the casting process; on the other hand, if the clamping force is too small, the mold core is not clamped and may shift in position during the casting process. In either case, it will affect the manufacturing accuracy of the casting, and in severe cases, it may even cause the casting to be scrapped.

[0024] Therefore, the spring clip is connected to the mounting base in the form of a threaded connection, so that the clamping force provided by the spring clip can be adjusted, and then it can adapt to mold cores with different compressive strengths, making the application scope of the present invention wider. Specifically, before the installation of the present invention, the spring clip is clamped on the mounting base by screws. When the clamping force needs to be adjusted, the screws fixing the spring clip are loosened, and the length of the spring clip extending in front of the end face of the pressing block is adjusted. A greater clamping force can be obtained by extending the length, and a smaller clamping force can be obtained by shortening the length. Then, the screw is tightened to complete the adjustment of the clamping force of the present invention. The principle of adjustment is that when the length of the spring clip is extended, the spring clip will contact the end face of the pressing block earlier during the rotation of the mounting base, and then obtain a larger deformation in the subsequent process, and then obtain a greater elastic force; when the length of the spring clip is shortened, the deformation obtained by the spring clip during the rotation of the mounting base becomes smaller, so the elastic force is reduced.

[0025] Furthermore, by setting the scale and the scale pointer, the operator who performs the adjustment work can more intuitively understand the size of the clamping force provided by the spring piece, which facilitates the operator to adjust the clamping force.

[0026] As a preferred solution of the present invention, one end of the spring sheet close to the pressing block is bent in a direction away from the pressing block.

[0027] The spring piece is processed by chrome plating process.

[0028] In the process of the spring sheet transmitting the elastic force to the pressing block, the end of the spring sheet close to the pressing block will first contact the pressing block, and in the subsequent deformation process, the end of the spring sheet in contact with the pressing block will slide on the end face of the pressing block. However, when the spring sheet just contacts the pressing block, if the spring sheet slides on the end face of the pressing block, the force applied to the pressing block will be at an acute angle with the end face of the pressing block. At this time, the spring sheet may produce a cutting effect on the pressing block, causing the pressing block to suffer unnecessary wear. Therefore, by setting the spring sheet to bend, the end face of the pressing block can be tangent to the flange of the spring sheet bending. At this time, the force applied by the spring sheet to the pressing block will be perpendicular to the end face of the pressing block, thereby avoiding the occurrence of cutting effect, thereby avoiding unnecessary wear of the pressing block.

[0029] Furthermore, by setting the spring piece to adopt a chrome plating process, the wear resistance of the spring piece can be improved, thereby reducing the wear of the spring piece during the working process of the present invention, avoiding the occurrence of inaccurate clamping force due to wear of the spring piece, and extending the service life of the present invention.

[0030] As a preferred solution of the present invention, a limiting disk is installed on the pressing block, and the limiting disk cooperates with a plurality of spring sheets.

[0031] It is worth noting that there is a gap between the limiting plate and the end surface of the pressing block for accommodating the spring sheet.

[0032] By setting a limit plate, in the process of the spring sheet applying clamping force to the pressure block through deformation, the sliding of the spring sheet on the end surface of the pressure block can proceed normally; in addition, in the process of the spring sheet recovering from the deformed state to the natural state, the limit plate will be pushed by multiple spring sheets together in the direction away from the mold, so the pressure block will also move, so that the pressure block pressed on the mold core is retracted, and then the pressure block is separated from the surface of the mold core. In this way, the pressure block does not hinder the removal of the finished casting, and at the same time, the pressure block does not hinder the installation of the next mold core. Therefore, the equipment of the present invention can perform continuous processing without disassembly, reducing the input of manpower, improving the degree of automation of the equipment, and thus improving the production efficiency of the equipment.

[0033] In summary, compared with the prior art, the present invention has the following advantages:

[0034] 1. When the upper and lower molds of the casting mold are closed, the spring sheet can automatically clamp the pressing block on the surface to be clamped of the mold core, thereby realizing the automatic clamping of the mold core and improving the clamping efficiency; at the same time, through the cooperation between the spring sheet and the limit plate, the pressing block neither hinders the escape of the finished casting nor the installation of the next mold core during the casting process, so the present invention can perform continuous processing without disassembly, and further improves the degree of automation of the equipment.

[0035] 2. By setting the limit table and its matching relationship with the push block, the time that the pin needs to be stressed in a casting process is shortened, the stress condition of the pin is improved, and the service life of the pin is extended, thereby improving the reliability of the present invention.

[0036] 3. By setting the spring sheet to be connected to the mounting base in the form of a threaded connection, the clamping force provided by the spring sheet can be adjusted, thereby being able to adapt to mold cores with different compressive strengths, making the application scope of the present invention wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is a schematic diagram of the specific forward structure of the lower clamp;

[0039] Figure 3 Schematic diagram of the back structure of the lower clamp

[0040] Figure 4 It is a schematic diagram of the specific structure of the upper clamp;

[0041] Figure 5 It is a schematic diagram of the push block structure;

[0042] Figure 6 for Figure 1 Top view of the .

[0043] In the figure: 1. upper clamping body; 2. lower clamping body; 3. mounting base; 4. pressing block; 5. pushing block; 11. plug pin; 21. slot; 22. slideway 1; 31. spring piece; 41. limit plate; 111. limit platform; 211. slideway 2. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0045] like Figures 1 to 6 As shown, a first specific embodiment of the present invention is shown, in which the casting mold adopts a horizontal split mold.

[0046] It should be noted in advance that the fixed installation methods mentioned below, unless otherwise specified, all adopt threaded connection.

[0047] As preparation before installation of the present invention, the upper clamp body 1, the pin 11 and the limit platform 111 are manufactured together; each mounting base 3 is equipped with two supports for realizing its rotation; and a fixing groove for threaded connection is provided on the spring piece 31.

[0048] When the present invention is installed, take out the lower clamp body 2, and movably install the multiple push blocks 5 into the multiple slide grooves 22 respectively; then take out the two mounting bases 3, and for both mounting bases 3, movably install the two supports onto the mounting bases 3 respectively, and then fix the two supports onto the lower clamp body 2; after the multiple mounting bases 3 are installed, then fix the multiple spring pieces 31 onto the mounting bases 3 respectively; thereafter, place the pressing block 4 into the lower clamp body 2, and make the multiple spring pieces 31 contact with the pressing block 4; then, fix the limiting plate 41 onto the pressing block 4. At this point, the installation of the lower clamp body 2 and its related parts is completed. Finally, the lower clamp body 2 is fixedly installed onto the lower mold, and the upper clamp body 1 is fixedly installed onto the upper mold, so that the upper clamp body 1 and the lower clamp body 2 can be smoothly matched during the closing process of the upper and lower molds. At this point, the installation of the equipment of the present invention is completed.

[0049] When the present invention is working, after the casting production is completed, the finished casting is measured, and the measurement results show that the dimensional tolerances of the casting meet the process requirements, which means that the present invention neither causes damage to the mold core due to excessive clamping force nor causes displacement of the mold core due to insufficient clamping force.

[0050] like Figures 1 to 6 The second specific embodiment of the present invention is shown in FIG. The difference between this embodiment and the first specific embodiment is that the casting mold at this time adopts a vertical split mold.

[0051] When the present invention is working, after the casting production is completed, the finished casting is measured, and the measurement results show that the dimensional tolerances of the casting meet the process requirements. However, in the process of clamping the mold core, since the vertical parting mold lacks an effective way to provide vertical support force to the mold core, it is necessary to support the mold core with manual assistance during the closing process of the left and right molds to prevent the mold core from falling from the mold.

[0052] By comparing the above two specific embodiments of the present invention, it can be found that the present invention can clamp the mold core regardless of whether it is a vertical split mold or a horizontal split mold. However, compared with the vertical split mold, the present invention is more applicable to the horizontal split mold because the vertical split mold is difficult to provide sufficient support force to the mold core in the vertical direction, and thus requires additional manpower or equipment for assistance.

Claims

1. A fully automatic coated sand mold core clamping mechanism, comprising: The upper clamp is concrete (1), the lower clamp is concrete (2); The upper clamp body (1) and the lower clamp body (2) are combined to form a clamp for clamping the mold core; The upper clamp body (1) is provided with a plug pin (11) at the bottom end, and the lower clamp body (2) is provided with a slot (21) that cooperates with the plug pin (11); It is characterized by further comprising: An automatic clamping device, wherein the lower clamping body (2) is provided with the automatic clamping device, and when the mold core is installed in the mold, the automatic clamping device automatically clamps the mold core; The automatic clamping device comprises a plurality of mounting bases (3) mounted on the lower clamping body (2), the plurality of mounting bases (3) being capable of rotating relative to the lower clamping body (2), each mounting base (3) being provided with a spring sheet (31) for providing a clamping force, a through hole being provided on the lower clamping body (2), a pressure block (4) for transmitting the clamping force being provided in the through hole, the plurality of spring sheets (31) being cooperated with the pressure block (4), the lower clamping body (2) being provided with a plurality of push blocks (5) for pushing the mounting base (3) to rotate, the plurality of push blocks (5) being cooperated with the pins (11) in a wedge shape, the lower clamping body (2) being provided with a plurality of slide grooves (22) for cooperating with the push blocks (5), and the push blocks (5) being installed in the slide grooves (22); The upper clamping body (1) and the lower clamping body (2) are respectively installed on the upper mold and the lower mold. When the upper mold and the lower mold are closed, the upper clamping body (1) and the lower clamping body (2) will also be matched. The mold core is installed on the lower mold, the end face of the pressure block (4) is aligned with the surface to be clamped of the mold core, the spring sheet (31) is in a naturally relaxed state, and the end of the push block (5) close to the lower mold extends into the slot (21) so that the pin (11) can cooperate with the push block (5) during the process of inserting the pin into the slot (21); the upper mold moves downward under the action of external force and gradually closes the mold with the lower mold. During this process, the pin (11) is gradually inserted into the slot (21) and, through the wedge-shaped cooperation relationship with the push block (5), the push block (5) is pushed along the slide groove (22) to the end away from the mold, and the push block (5) is pushed. ) will push the mounting base (3) to rotate the mounting base (3), thereby pressing the spring sheet (31) onto the end face of the pressure block (4) that matches it. At this time, the mounting base (3) continues to rotate, so the spring sheet (31) undergoes elastic deformation and generates elastic force. The elastic force drives the pressure block (4) to squeeze the surface to be clamped of the mold core. Through the pressure block (4), the elastic force of the spring sheet (31) becomes the clamping force of the clamping mold core. Finally, the upper and lower molds are closed. At this time, the pin (11) and the slot (21) are also fully matched, and the upper clamp body (1) and the lower clamp body (2) are also matched to form a clamp.

2. The fully automatic coated sand mold core clamping mechanism according to claim 1 is characterized in that: The spring piece (31) is made of spring steel.

3. The fully automatic coated sand mold core clamping mechanism according to claim 1 is characterized in that: One end of the spring sheet (31) close to the pressing block (4) is bent in a direction away from the pressing block (4).

4. The fully automatic coated sand mold core clamping mechanism according to claim 2 is characterized in that: The spring piece (31) is processed by chrome plating process.

5. The fully automatic coated sand mold core clamping mechanism according to claim 1 is characterized in that: A limiting platform (111) is provided on the plug pin (11), the limiting platform (111) and the push block (5) cooperate with each other, a second slide groove (211) that cooperates with the limiting platform (111) is provided on the side wall surface of the slot (21), and the push block (5) and the second slide groove (211) cooperate with each other.

6. The fully automatic coated sand mold core clamping mechanism according to claim 1, characterized in that: The spring sheet (31) is mounted on the mounting base (3) in the form of a threaded connection.

7. The fully automatic coated sand mold core clamping mechanism according to claim 6, characterized in that: The spring sheet (31) is provided with a scale, and the mounting base (3) is provided with a scale pointer that cooperates with the scale. The scale and the scale pointer are used together to display the magnitude of the clamping force provided by the spring sheet (31).

8. The fully automatic coated sand mold core clamping mechanism according to claim 1, characterized in that: A limiting plate (41) is installed on the pressing block (4), and the limiting plate (41) cooperates with a plurality of spring sheets (31).

9. The fully automatic coated sand mold core clamping mechanism according to any one of claims 1 to 8, wherein the method of using the fully automatic coated sand mold core clamping mechanism is as follows: S1: First, the upper clamp body (1) is fixedly installed on the upper mold, and the lower clamp body (2) is fixedly installed on the lower mold; S2: During the process of the upper mold gradually closing with the lower mold, the pin (11) is gradually inserted into the slot (21), and the push block (5) is pushed along the slide groove (22) to the side away from the pin (11). The push block (5) pushes the mounting base (3), causing the mounting base (3) to rotate, pressing the spring sheet (31) onto the end surface of the pressing block (4), and squeezing the pressing block (4) by the elastic force of the spring sheet (31), so that the pressing block (4) clamps the mold core, thereby completing the clamping of the mold core.

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