Frog mark casting structure and frog process manufacturing method

Abstract

The invention discloses a frog mark casting structure and a frog process manufacturing method. The frog mark casting structure comprises a frog model and two mark sand cores, wherein the frog model is used for forming a lower half cavity of a frog, and the two mark sand cores are used for being matched with the frog model to form sinking grooves with protruding casting mark fonts on the two sides of a frog bottom plate respectively. Two concave positioning cavities are formed in a bottom plate of the frog model; the two identification sand cores are respectively positioned and supported in the two positioning cavities, and the lower surfaces, with the casting identification content character cavities, of the identification sand cores are tightly attached to the bottom surfaces of the positioning cavities. According to the frog mark casting structure, the working efficiency of operators can be improved, the casting mark can be effectively prevented from inclining, meanwhile, damage to the edge of a mark sand core can be reduced, then the forming quality of a frog is improved, floating sand is not prone to entering the position between the frog and the mark sand core in the follow-up molding sand filling process, and the production efficiency is improved. And therefore, no obvious boss bulge exists near the cast casting mark, and the appearance quality of the casting mark is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of frog sand casting, in particular to a frog marking casting structure. In addition, the present invention also relates to a frog manufacturing method. Background Art

[0002] The frog is the main product of the turnout that allows the train wheels to cross from one rail to another. Faced with the increasingly abundant frog products, in order to distinguish them, it is usually necessary to cast corresponding product identification information on the frog to distinguish them, including "factory mark + model + serial number + CRCC certification number" and other identifications.

[0003] At present, frog product logos are directly cast on the rail wall of the frog body, as shown in the attached Figure 1 As shown, it is mainly carried out through the following steps:

[0004] Step 1: embed the corresponding identification molds into the movable shared core box mold, fill in the core sand and pass CO2 to harden it, and prefabricate four sand cores with casting identification content;

[0005] Step 2: When molding, directly place the above sand cores in a certain order, close to the track walls on both sides of the frog wooden model, and the four sand cores are spaced a certain distance apart to allow for a certain amount of sand to be consumed; different frog products can be placed in a suitable position on the track wall according to the marked sand core length, and when the track wall space is insufficient, they can be placed on the outer side of the frog guardrail; then fill in the remaining molding sand, buckle the sand box and compact it.

[0006] Step three: Use the carbon dioxide vacuum hardening replacement system to harden the sand mold in the sand box, and use the flip mold machine to take out the sand mold from the frog wood model; transfer the sand mold to the repair area for repair, paint the inner surface of the cavity and the surface of the sand core at the casting mark, remove the floating sand in the cavity and the parting surface, and the thickly accumulated paint, and then buckle the upper and lower mold boxes to obtain the cavity.

[0007] Step 4: Pour the smelted molten metal into the mold cavity and complete the sand removal and cleaning to obtain a casting with product identification information.

[0008] In the above method, the shared core box is made of segmented detachable catalpa wood, and the identification sand cores of different lengths (such as 60-9-I, 60-4.5R-IV, etc.) can be made according to the identification information of the frog product. The font height*thickness for casting the logo is 60*5mm. The core sand material used for making the logo is forsterite sand, which is directly taken from the sand mixing equipment and is consistent with the molding sand selected for making the frog body cavity.

[0009] The existing method has the following defects:

[0010] 1) In the above step 1, the mold used to make the identification sand core with the casting logo is a shared wooden core box, not a dedicated core box mold, which mainly relies on a movable block to make sand cores of different lengths. The overall workmanship is rough, which often causes the surface of the identification sand core to wear off when taking the mold;

[0011] 2) The core sand used to make the identification sand core is the same as the molding sand used to make the sand mold of the frog product, both of which are forsterite sand, which is mixed by adding a small amount of water glass in the sand mixing equipment. The surface quality of the frog cavity of the sand mold made by it is OK, but the bonding effect of the identification sand core is not good, and it is easy to have corner defects when taking the mold (in the existing process, the surface of the sand mold made of forsterite for large parts such as frogs looks OK, but if it is used for small parts such as identification sand cores, sand often falls off from the corners, resulting in an uneven surface of the casting);

[0012] 3) In the above step 2, the identification sand core is directly attached to the rail wall or guardrail surface on the frog wooden model during molding production, and the identification sand core is pressed against the surface of the frog wooden model by the sand on the back side. Due to the uneven surface flatness of different wooden models, it is not easy for the identification sand core to fit the surface of the wooden model, resulting in a large convex platform on the casting mark; secondly, there is no positioning support under the identification sand core, and the operator only relies on leveling the sand below and then placing the casting identification sand core on it, which easily causes the casting marks on both sides to tilt left and right. Summary of the invention

[0013] The invention provides a frog mark casting structure and a frog process manufacturing method, so as to solve the technical problems existing in the prior art that a mark sand core is not easy to fit with a wooden model surface, thus causing a large boss to appear on the casting mark, and there is no positioning support under the mark sand core, thus easily causing the casting marks on both sides to tilt left and right.

[0014] The technical solution adopted by the present invention is as follows:

[0015] A frog marking casting structure comprises: a frog model for forming a lower half cavity of a frog, and two marking sand cores for cooperating with the frog model to respectively form two convex casting marking characters in a sink groove on both sides of a frog bottom plate; the bottom plate of the frog model is provided with two concave positioning cavities; the two marking sand cores are respectively positioned and supported in the two positioning cavities, and the lower surface of the cavity with the casting marking characters on each marking sand core is in close contact with the cavity bottom surface of the positioning cavity.

[0016] Furthermore, the depth of the positioning cavity is greater than the depth of the character cavity, so that the casting logo font formed by the character cavity is located in the sink formed by the positioning cavity.

[0017] Furthermore, the positioning cavity is a square cavity, the side wall of the square cavity has an inclination angle greater than 90° with its cavity bottom surface, and the two adjacent cavity side walls are connected by a circular arc transition; the partial structural shape of the marking sand core inserted into the positioning cavity matches the shape of the positioning cavity.

[0018] Furthermore, the frog model includes a frog wooden mold and two positioning frames; two concave positioning grooves are processed on the bottom plate of the frog wooden mold; the two positioning frames are respectively positioned and fixed in the two positioning grooves, and each positioning frame is concave toward the corresponding positioning groove to form a positioning cavity.

[0019] Furthermore, the positioning frame comprises a frame body having a positioning cavity, and a plurality of connecting ears connected to the periphery of the frame body; the connecting ears are used for fasteners to be passed through and fixedly connected to the frog wooden mold.

[0020] According to another aspect of the present invention, a frog manufacturing method is also provided, comprising the following steps: core making: preparing two identification sand cores as described above; sand core processing: processing the identification sand cores to improve the molding quality of the casting identification font; molding: placing the frog model as described above and the two identification sand cores into a sand box respectively to mold to obtain a lower half sand mold with a lower half mold cavity; casting: combining the lower half sand mold with the upper half sand mold obtained by molding in a conventional manner and then casting to obtain the frog.

[0021] Furthermore, the step of "core making" specifically includes the following steps: core box customization: a special core box is customized so that the lower shape of the identification sand core matches the shape of the positioning cavity in the frog model; core sand preparation: quartz sand, water glass and phenolic resin are used to prepare core sand with better strength; sand core making: the identification mold and core sand are respectively filled into a special core box to make an identification sand core.

[0022] Furthermore, the core sand contains 100 parts of quartz sand, 2.5 to 3.0 parts of water glass, and 0.3 to 0.8 parts of phenolic resin.

[0023] Furthermore, the specific operation of the step "sand core treatment" is: first pre-brush the outer surface of the logo sand core with paint, then use compressed air to blow off the paint that may be accumulated in the character cavity, then ignite the paint to sinter it dry, and finally clean up excess paint and floating sand.

[0024] Furthermore, the specific operation of the step "molding" is: first, position the frog model in the sand box, then position the two identification sand cores in the two positioning cavities on the frog model respectively, and finally fill in the molding sand, compact it, and remove it from the mold after hardening to obtain the lower half sand mold.

[0025] The present invention has the following beneficial effects:

[0026] In order to solve the problems existing in the prior art, the technical solution adopted by the present invention is to cancel the casting mark on the original rail wall of the frog, and adjust the casting mark to the upper surface of both sides of the bottom plate of the frog. The adjusted casting mark adopts a "sunken groove + convex character" structure, that is, by setting two concave positioning cavities on the bottom plate of the frog model, and then forming a sunken groove on both sides of the bottom plate of the frog, and then by the cooperation of two identification sand cores whose lower sides are positioned in the two positioning cavities and have casting identification content cavities on the lower surface and the two positioning cavities, a convex casting identification font is formed in the sinking groove, and considering the available space on the bottom plate of the frog, the optimized casting mark is made of four merged into two identification sand cores, namely, the identification sand core of "factory mark + model" and the identification sand core of "serial number + certification number";

[0027] In the frog mark casting structure of the present invention, when the frog is molded, the operator only needs to directly put the two marking sand cores into the two positioning cavities of the frog model respectively, and then quickly coordinate the positioning by relying on the positioning of the positioning cavity and the corresponding marking sand core, thereby improving the work efficiency of the operator, and making the marking sand core stably connected to the frog model without shaking, so that in the subsequent molding sand filling process, the marking sand core is not pushed by external force, thereby effectively preventing the casting mark from tilting, and at the same time, it can also reduce the damage of the edges of the marking sand core, thereby improving the molding quality of the frog, and under the gravity of the marking sand core itself, the lower surface of the marking sand core with the casting mark content cavity is in close contact with the cavity bottom surface of the positioning cavity, so that it is not easy to enter the floating sand between the two in the subsequent molding sand filling process, so that there is no obvious convex platform near the cast casting mark, thereby improving the appearance quality of the casting mark; in addition, according to the analysis of the survey situation, there is no application example of placing the casting mark on the frog bottom plate in the prior art, so the technology of the present invention is innovative and forward-looking;

[0028] In the frog manufacturing process of the present invention, since the frog model as described above and the two marking sand cores as described above are respectively placed in the sand box to form the lower half sand mold during molding, the casting mark of the frog obtained by the lower half sand mold casting will be located on the upper surfaces of both sides of its bottom plate, and it is a "sunk groove + convex character" structure, which is innovative and forward-looking; on the other hand, when the frog is molded, the positioning cavity on the frog model and the corresponding marking sand core can be quickly coordinated and positioned, thereby improving the work efficiency of the operator, so that the marking sand core and the frog model are stably connected without shaking, so that the marking sand core is not pushed by external force during the subsequent molding and sand filling process, thereby effectively preventing the casting mark from tilting, and at the same time reducing the damage of the edges of the marking sand core, ultimately improving the molding quality of the frog, and under the gravity of the marking sand core itself, it is not easy for floating sand to enter the positioning cavity between the marking sand core and the frog model during the subsequent molding and sand filling process, thereby making it possible to have no obvious convex platform bulge near the cast casting mark, greatly improving the appearance quality of the casting mark.

[0029] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 It is a schematic diagram of the spatial structure of the existing frog;

[0032] Figure 2 It is a schematic diagram of the cross-sectional front view of the frog marking casting structure of the preferred embodiment of the present invention;

[0033] Figure 3 yes Figure 2 The main structural diagram of the sand core is shown in the middle;

[0034] Figure 4 yes Figure 3 Schematic diagram of the structure viewed from above;

[0035] Figure 5 yes Figure 2 A schematic diagram of the top view of the positioning frame;

[0036] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure in the middle AA direction;

[0037] Figure 7 yes Figure 5 Schematic diagram of the main structure;

[0038] Figure 8 It is a partial spatial structure schematic diagram of the frog of the present invention;

[0039] Fig. 9 This is a schematic diagram of the spatial structure of the lower half of the sand mold designed in this scheme.

[0040] Legend:

[0041] 10. frog; 11. bottom plate; 101. casting identification font; 21. frog wooden mold; 22. positioning frame; 221. frame body; 222. connecting ear; 30. identification sand core; 301. character cavity. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0043] Reference Figure 2The preferred embodiment of the present invention provides a frog identification casting structure, comprising: a frog model for forming a lower half cavity of a frog 10, and two identification sand cores 30 for cooperating with the frog model to respectively form two identification sand cores 30 with protruding casting identification characters 101 in a sink groove on both sides of a bottom plate 11 of the frog 10; the bottom plate of the frog model has two concave positioning cavities; the two identification sand cores 30 are respectively positioned and supported in the two positioning cavities, and the lower surface of each identification sand core 30 with a casting identification character cavity 301 is in close contact with the bottom surface of the positioning cavity.

[0044] In order to solve the problems existing in the prior art, the technical solution adopted by the present invention is to cancel the casting mark on the original rail wall of the frog, and adjust the casting mark to the upper surface on both sides of the bottom plate 11 of the frog 10. The adjusted casting mark adopts a "sunken groove + convex character" structure, that is, by setting two concave positioning cavities on the bottom plate of the frog model, and then forming a sunken groove on both sides of the bottom plate 11 of the frog 10, and then two identification sand cores 30 with casting identification content cavities on the lower surface are positioned in the two positioning cavities at the lower side, and the two positioning cavities are matched to form a convex casting identification font 101 in the sinking groove, and considering the available space on the bottom plate of the frog 10, the optimized casting mark is made of four merged into two identification sand cores 30, which are the identification sand core of "factory mark + model" and the identification sand core of "serial number + certification number".

[0045] In the frog mark casting structure of the present invention, when the frog is molded, the operator only needs to directly put the two marking sand cores 30 into the two positioning cavities of the frog model respectively, and then quickly coordinate the positioning by relying on the positioning of the positioning cavity and the corresponding marking sand core 30, thereby improving the work efficiency of the operator, and making the marking sand core 30 stably connected to the frog model without shaking, and then in the subsequent molding sand filling process, the marking sand core 30 is not pushed by external force, thereby effectively preventing the casting mark from tilting, and at the same time, it can also reduce the damage of the edges of the marking sand core 30, thereby improving the molding quality of the frog 10, and under the gravity of the marking sand core 30 itself, the lower surface of the marking sand core 30 with the casting mark content cavity is in close contact with the cavity bottom surface of the positioning cavity, and then in the subsequent molding sand filling process, it is not easy for floating sand to enter between the two, thereby making the cast casting mark without obvious convex platform bulge near the casting mark, thereby improving the appearance quality of the casting mark; in addition, according to the analysis of the survey situation, there is no application example of placing the casting mark on the bottom plate of the frog 10 in the prior art, so the technology of the present invention is innovative and forward-looking.

[0046] Alternatively, if Figure 2As shown, the depth of the positioning cavity is greater than the depth of the character cavity, so that the casting logo font 101 formed by the character cavity 301 is located in the sink formed by the positioning cavity. In this optional solution, the depth of the positioning cavity is 4mm, and the depth of the character cavity is 3mm, so after forming, the upper surface of the entire casting logo font 101 is slightly lower than the upper surface of the bottom plate 11 of the frog 10 by 1mm, which does not affect the visual effect of the casting logo and is beneficial to the robot to clean and polish the upper surface of the bottom plate 11.

[0047] Alternatively, if Figure 2-4 As shown, the positioning cavity is a square cavity, and the cavity side wall of the square cavity has an inclination angle greater than 90° with its cavity bottom surface, and the two adjacent cavity side walls are connected by a circular arc transition; the structural shape of the part of the marking sand core 30 inserted into the positioning cavity matches the shape of the positioning cavity. In this optional scheme, the four cavity side walls of the square cavity have an angle of 135° with its cavity bottom surface, thereby forming a 45° chamfer, and the fillet of R10mm between the two adjacent cavity side walls forms an arc transition connection, so that when the frog is modeled, the operator only needs to directly put the marking sand core 30 into the positioning cavity of the frog model bottom plate, and rely on the positioning cavity and the chamfer of the marking sand core 30 to quickly cooperate and position, so that the marking sand core 30 cannot swing back and forth, reducing the wear of the edges, and under the gravity of the marking sand core 30 itself, its bottom is in close contact with the positioning cavity, and it is not easy for floating sand to enter the contact between the two, thereby reducing the formation of boss tumors.

[0048] Alternatively, if Figure 2 As shown, the frog model includes a frog wooden mold 21 and two positioning frames 22; two concave positioning grooves are processed on the bottom plate of the frog wooden mold 21; the two positioning frames 22 are respectively positioned and fixed in the two positioning grooves, and each positioning frame 22 is concave toward the corresponding positioning groove to form a positioning cavity. Preferably, as Figure 2 As shown, the cross-sectional shape of the positioning groove matches the cross-sectional shape of the corresponding positioning frame 22 to position and install the positioning frame 22, thereby improving its installation quality. In this optional solution, in view of the fact that the frog wooden mold 21 may be worn out after long-term use, a metal positioning frame 22 is added between it and the marking sand core 30 to prevent the frog wooden mold 21 from affecting the positioning accuracy of the marking sand core 30 after being worn out.

[0049] In this option, if Figure 5-7 As shown, the positioning frame 22 includes a frame body 221 having a positioning cavity, and a plurality of connecting ears 222 connected to the outer periphery of the frame body 221; the connecting ears 222 are used for fasteners to be passed through and fixedly connected to the frog wood mold 21, so that the positioning frame 22 and the frog wood mold 21 are stably connected.

[0050] Reference Figure 2 , Figure 8-9 The preferred embodiment of the present invention also provides a frog manufacturing method, comprising the following steps:

[0051] Core making: preparing two marking sand cores 30 as described in any one of the above items;

[0052] Sand core processing: processing the logo sand core 30 to improve the molding quality of the casting logo font 101;

[0053] Molding: placing the frog model as described above and two marking sand cores 30 into a sand box respectively to mold to obtain a lower half sand mold having a lower half mold cavity;

[0054] Casting: The frog 10 is obtained by combining the lower half sand mold with the upper half sand mold obtained by conventional molding and casting.

[0055] In the frog manufacturing method of the present invention, since the frog model as described above and the two marking sand cores 30 as described above are respectively placed in the sand box to form the lower half sand mold during molding, the casting mark of the frog 10 obtained by the lower half sand mold will be located on the upper surface of both sides of its bottom plate, and it is a "sunk groove + convex character" structure, which is innovative and forward-looking; on the other hand, when the frog is molded, the positioning cavity on the frog model and the corresponding marking sand core 30 can be quickly matched and positioned, thereby improving the work efficiency of the operator. , so that the marking sand core 30 is stably connected to the frog model without shaking, so that the marking sand core 30 is not pushed by external force during the subsequent molding sand filling process, thereby effectively preventing the casting mark from tilting, and at the same time reducing the damage to the edges of the marking sand core 30, ultimately improving the molding quality of the frog 10, and under the action of the gravity of the marking sand core 30 itself, it is not easy for floating sand to enter the positioning cavity between the marking sand core 30 and the frog model during the subsequent molding sand filling process, thereby making it possible to have no obvious boss bulge near the cast casting mark, greatly improving the appearance quality of the casting mark.

[0056] Optionally, the step of “core making” specifically includes the following steps:

[0057] Core box customization: A special core box whose lower shape of the customized marking sand core 30 matches the shape of the positioning cavity in the frog model. Figure 2 As shown, before the frog is produced and cast, a sink groove is first dug out on the bottom plate of the frog wooden mold 21, and a customized metal positioning frame 22 is embedded in the sink groove. The positioning frame 22 is fixed to the frog wooden mold 21 with screws, and the upper surface of the positioning frame 22 is flush with the upper surface of the bottom plate of the frog wooden mold 21; a special core box for making the marking sand core 30 is made of a customized metal core box, and part of the structure of the metal core box is optimized, so that the lower surface of the marking sand core 30 made by the metal core box has a C4×45° chamfer to match the positioning cavity on the frog model;

[0058] Core sand preparation: Quartz sand, water glass and phenolic resin are used to prepare core sand with better strength; specifically, after process test verification, it was found that adding 2.5-3.0 parts of water glass and 0.3-0.8 parts of phenolic resin to 100 parts of quartz sand and mixing them can make the marking sand core 30 reach the best strength (≥1.2mpa), and the sands are more firmly bonded to each other and not easy to fall off sporadically, thereby reducing the occurrence of tumors in later castings. Preferably, the core sand contains 100 parts of quartz sand, 2.7 parts of water glass and 0.5 parts of phenolic resin. The marking sand core 30 prepared with this core sand has the best strength, and the sands are more firmly bonded to each other and not easy to fall off sporadically, thereby greatly reducing the occurrence of tumors in later castings;

[0059] Making sand core: Fill the logo mold and core sand into a special core box to make a logo sand core 30. Specifically, first clean the impurities on the surface of the special core box, then put the logo mold at the bottom of the special core box, then fill the core sand that has been stirred evenly into the special core box, and compact it manually, then pass carbon dioxide to harden it, and finally take the hardened sand core out of the special core box to obtain the logo sand core 30 with the casting logo information cavity.

[0060] Optionally, the specific operation of the step "sand core treatment" is: first pre-brush the outer surface of the logo sand core 30 with paint, then use compressed air to blow off the paint that may be accumulated in the character cavity, then ignite the paint to sinter and dry it, and finally clean up the excess paint and floating sand. The present invention optimizes the core making process, covers the paint on the surface of the character cavity by infiltration, and uses compressed air to remove the paint accumulated on the surface to avoid paint accumulation, so that the product casting logo font is clearer and more visible, and has no angular defects.

[0061] Optionally, the specific operation of step "molding" is: first, position the fork model in the sand box, and then position the two identification sand cores 30 in the two positioning cavities on the fork model respectively, and finally fill in the molding sand, compact it, and remove it from the mold after hardening to obtain the lower half sand mold; during molding, the positioning operation is simple, which improves the work efficiency of the operator, and the identification sand core 30 is stably connected to the fork model without shaking, so that in the subsequent molding and sand filling process, the identification sand core 30 is not pushed by external force, which can effectively prevent the casting logo from tilting, and at the same time, it can also reduce the damage of the edges of the identification sand core 30, thereby improving the molding quality of the fork 10, and under the action of the gravity of the identification sand core 30 itself, the lower surface of the identification sand core 30 with the casting logo content is in close contact with the bottom surface of the positioning cavity, so that it is not easy to get floating sand between the two in the subsequent molding and sand filling process, so that there is no obvious boss bulge near the cast casting logo, thereby improving the appearance quality of the casting logo.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A frog marking casting structure, characterized in that: include: A frog model for forming a lower half cavity of a frog (10), and two marking sand cores (30) for respectively forming two protruding casting marking fonts (101) in a sink groove on both sides of a bottom plate (11) of the frog (10) in cooperation with the frog model; The bottom plate of the frog model is provided with two concave positioning cavities; Two marking sand cores (30) are respectively positioned and supported in the two positioning cavities, and the lower surface of each marking sand core (30) with a casting marking content cavity (301) is closely attached to the cavity bottom surface of the positioning cavity.

2. The frog marking casting structure according to claim 1, characterized in that: The depth of the positioning cavity is greater than the depth of the character cavity, so that the casting identification font (101) formed by the character cavity (301) is located in the sink formed by the positioning cavity.

3. The frog marking casting structure according to claim 1, characterized in that: The positioning cavity is a square cavity, the cavity side wall of the square cavity and its cavity bottom have an inclination angle greater than 90°, and the two adjacent cavity side walls are connected by arc transition; The structural shape of the part of the marking sand core (30) inserted into the positioning cavity matches the shape of the positioning cavity.

4. The frog marking casting structure according to claim 3, characterized in that: The frog model comprises a frog wooden mold (21) and two positioning frames (22); Two concave positioning grooves are processed on the bottom plate of the frog wooden mold (21); The two positioning frames (22) are respectively positioned and fixed in the two positioning grooves, and each positioning frame (22) is concave toward the corresponding positioning groove to form a positioning cavity.

5. The frog marking casting structure according to claim 4, characterized in that: The positioning frame (22) comprises a frame body (221) having a positioning cavity, and a plurality of connecting ears (222) connected to the outer periphery of the frame body (221); The connecting ear (222) is used for fixing and connecting the frog wooden mold (21) after the fastener is passed through.

6. A frog manufacturing method, characterized in that: The following steps are involved: Core making: preparing two marking sand cores (30) as claimed in any one of claims 1 to 3; Sand core processing: processing the logo sand core (30) to improve the molding quality of the casting logo font (101); Molding: placing the frog model according to any one of claims 1 to 5 and two marking sand cores (30) into a sand box for molding to obtain a lower half sand mold having a lower half mold cavity; Casting: The lower half sand mold is combined with the upper half sand mold obtained by conventional molding and then cast to obtain a frog (10).

7. The frog manufacturing method according to claim 6, characterized in that: The step "core making" specifically includes the following steps: Core box customization: a special core box whose lower shape of the customized marking sand core (30) matches the shape of the positioning cavity in the frog model; Core sand preparation: Quartz sand, water glass and phenolic resin are used to prepare core sand with better strength; Making sand core: Fill the identification mold and core sand into a special core box to make the identification sand core (30).

8. The frog manufacturing method according to claim 7, characterized in that: The core sand contains 100 parts of quartz sand, 2.5 to 3.0 parts of water glass, and 0.3 to 0.8 parts of phenolic resin.

9. The frog manufacturing method according to claim 6, characterized in that: The specific operation of step "sand core treatment" is: firstly, pre-brush the outer surface of the logo sand core (30) with paint, then use compressed air to blow away the paint that may be accumulated in the character cavity, then ignite the paint to sinter it dry, and finally clean up the excess paint and floating sand.

10. The frog manufacturing method according to claim 6, characterized in that: The specific operation of step "molding" is: firstly, the frog model is positioned in the sand box, then two marking sand cores (30) are positioned in two positioning cavities on the frog model respectively, and finally, the molding sand is filled in, compacted, and hardened before demolding to obtain the lower half sand mold.

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