Tail plate casting resin sand molding mold

Abstract

The utility model relates to the technical field of casting molds, in particular to a tail plate casting resin sand molding mold, which is characterized by comprising an upper mold used for molding an upper box casting mold and a lower mold used for molding a lower box casting mold, the upper mold comprises an upper mold plate used for being matched with an upper sand box for molding to form the upper box casting mold, and a lower mold plate used for being matched with a lower sand box for molding to form the lower box casting mold; the main body forming piece is arranged on the upper shaping plate, a hinge forming part is arranged on the main body forming piece, and a connecting hole is formed in the hinge forming part; the resin sand casting mold has the advantages that the resin sand casting mold modeling structure is simplified, the casting production efficiency is improved, and the production quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting molds, in particular to a tail plate casting resin sand molding mold. Background Art

[0002] In large injection molding machines and large die-casting equipment, the parts are usually produced by casting due to their large size. Among them, in the current foundry industry, the resin sand casting process has become relatively mature, and has excellent performance in terms of casting quality, casting efficiency and casting cost.

[0003] Based on this, in the relevant technology, there is a tail plate structure of an injection molding machine and a die-casting machine, on the main body of which a plurality of hinge seats are arranged, and hinge holes for installing hinge shafts are provided through the hinge seats. In the conventional resin sand casting process, a molding mold and a sand box are required for resin sand molding, that is, after the resin sand is filled into the sand box containing the mold, the mold is taken out from the mold after compaction and solidification to form the cavity outline inside the entire resin sand casting mold.

[0004] However, since the hole characteristics are difficult to form, in order to facilitate molding and demolding, corresponding connecting holes are usually set on the mold, and parting surfaces are set at the connecting holes. At the same time, the mold is split into a complex structure, resulting in the use of three-box molding when molding resin sand castings, which increases the workload of the resin sand casting during the molding process, thereby reducing production efficiency, so it needs to be improved.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0006] The utility model provides a tail plate casting resin sand molding die to solve the problems existing in the prior art.

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

[0008] A resin sand molding mold for a tail plate casting comprises an upper mold for molding an upper box mold and a lower mold for molding a lower box mold, wherein the upper mold comprises:

[0009] Upper mold plate, used to match the upper sand box to form the upper box casting mold;

[0010] A main body forming part is provided on the upper mold plate, wherein the main body forming part has a hinge forming part, and the hinge forming part has a connecting hole;

[0011] And a core-pulling tube, which is movably plugged into and matched with the connecting hole.

[0012] Preferably, a flange movable block is provided on at least one side of the hinged forming portion, and the flange movable block is close to the end of the connecting hole.

[0013] Preferably, a splicing groove is provided on one side of the hinged forming portion, and the flange movable block is provided with a splicing surface, which is spliced ​​and matched with the splicing groove.

[0014] Preferably, the fitting clearance between the flange movable piece and the hinged forming portion is ≤0.5 mm.

[0015] Preferably, an upper positioning core head is provided on the main body molding, and the upper positioning core head is used to form an upper positioning recess for placing the positioning hole sand core in the upper box casting mold.

[0016] Preferably, the core-pulling tube is hollow inside, one end is closed, and the other end is provided with a pulling portion.

[0017] Preferably, the pulling portion specifically includes a pulling hole that passes through both inner and outer sides of the core pulling tube.

[0018] Preferably, a support frame movable block is spliced ​​onto the main body molding, and the fitting clearance between the support frame movable block and the main body molding is ≤1.0mm.

[0019] Preferably, the lower mold comprises:

[0020] The lower mold plate is used to form the lower box casting mold in conjunction with the lower sand box;

[0021] and a lower positioning core head, which is arranged on the lower mold plate and is used to form a lower positioning recess in the lower box casting mold for placing the positioning hole sand core.

[0022] Preferably, the upper mold is provided with an upper positioning pin, which is used to form an upper positioning pin hole in the upper box mold, and the lower mold is provided with a lower positioning pin, which is used to form a lower positioning pin hole in the lower box mold.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The resin sand molding mold for the tail plate casting provided by the utility model can improve the original three-box molding core-setting process into a two-box molding core-pulling side hole core-setting process by pulling out the core-pulling tube from the side, thereby simplifying the molding structure setting of the mold, reducing the original parting surface design at the connecting hole, and reducing production costs; at the same time, it can also form the main part of the cavity through a complete main molding part, reducing defects such as burrs and dislocations caused by the parting surface, making the production quality of the casting more stable and reliable, and the casting qualification rate higher.

[0025] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a structural diagram of the tail plate casting;

[0028] Figure 2 This is a structural diagram of a resin sand molding mold for a tailgate casting provided by a preferred embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the assembly relationship between the hinged forming portion and the flange movable block provided by a preferred embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the assembly relationship between the support frame movable block and the main body molding provided in a preferred embodiment of the utility model;

[0031] Figure 5 This is a structural diagram of the lower mold provided by a preferred embodiment of the utility model;

[0032] Figure 6 It is a structural schematic diagram of a preferred embodiment of the present invention in which a main body sand core, an articulated seat sand core and a positioning hole sand core are placed on the inner surface of a mold cavity.

[0033] Reference numerals:

[0034] 1001, main body; 1002, hinge seat; 1003, support frame; 1004, positioning hole;

[0035] 1. Upper mold; 11. Upper mold plate; 12. Main molding part; 13. Core pulling tube; 14. Articulated molding part; 141. Connecting hole; 142. Splicing groove; 15. Flange loose piece; 16. Support frame loose piece; 17. Upper positioning core head; 18. Upper positioning pin;

[0036] 2. Lower mold; 21. Lower mold plate; 22. Lower positioning core head; 23. Lower positioning pin; 3. Main body sand core; 4. Articulated seat sand core; 5. Positioning hole sand core; 6. Inner surface of the cavity. DETAILED DESCRIPTION

[0037] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally located component.

[0039] In addition, the terms "long", "short", "inside", "outside", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientation structure, and should not be understood as a limitation of the present invention.

[0040] Reference Figure 1 , discloses a tailgate casting, which mainly includes a main body 1001 in a rectangular box shape, the interior of the main body 1001 is hollow, and the top is open; at the same time, a hinge seat 1002 is provided on the main body, and the hinge seat 1002 is mainly used to install the hinge shaft. Specifically, the number of the hinge seats 1002 is six, and the six hinge seats 1002 are divided into two groups, and the two groups of hinge seats 1002 are respectively arranged on both sides of the main body. In addition, support frames 1003 are provided on the opposite sides where the hinge seats 1002 are not provided, thus forming a relatively stable tailgate structure.

[0041] In the conventional casting process, it is first necessary to make a mold that imitates the shape of the workpiece and a sand core for forming the hole features. On this basis, the mold is first placed flat on the ground, and a sand box is placed on the mold. The sand box surrounds the mold and forms a filling cavity. Then, resin sand is filled in the filling cavity and the resin sand is compacted. After the resin sand hardens, the mold is turned over and the mold is taken out. In this way, a casting structure with the contour of the workpiece can be obtained. Repeat the above steps to obtain casting structures of multiple different parts. Then, the sand core is placed in the casting structure and multiple casting structures are stacked in a box to obtain a casting cavity. At the same time, structures such as pouring risers and runners are set on the casting structure. The molten metal liquid is poured into the casting cavity with the help of the casting cup and runner. After solidification, cooling, sand removal and cleaning, the casting is finally obtained.

[0042] However, when the above solution is applied to a tail plate casting with an articulated seat 1002, since the forming of the hinge hole is difficult, in order to ensure structural accuracy, a parting surface is usually set along the horizontal direction at the hinge hole, which is equivalent to using this parting surface as a boundary, and separately setting a set of casting structures on the upper and lower sides of the parting surface. In addition, a set of casting structures is generally set at the bottom of this type of workpiece to form the bottom contour of the casting, which is equivalent to requiring a three-layer casting structure to meet the production requirements of the casting. Despite this, because a parting surface is set at the hinge hole, structural errors will still occur at this position, affecting product quality.

[0043] The following is combined with Figure 1-6 The technical solution of the utility model is further illustrated through specific implementation methods.

[0044] Please refer to Figure 2 The embodiment of the present invention provides a tail plate casting resin sand molding mold, which is used to overcome the above problems and simplify the casting molding structure. It includes an upper mold 1 and a lower mold 2. The upper mold 1 is used to mold the upper box casting mold, and the lower mold 2 is used to mold the lower box casting mold.

[0045] Specifically, the upper mold 1 includes an upper mold plate 11, a main molding part 12 and a core pulling tube 13, wherein the upper mold plate 11 is a flat structure, mainly used for placing the upper sand box. After the upper sand box is placed on the upper mold plate 11, the upper sand box can be enclosed to form an upper filling cavity.

[0046] At this time, the main molding part 12 is arranged on the upper mold plate 11. The main molding part 12 is mainly assembled from multiple plates to form a similar contour structure to the main body 1001 of the casting. During the specific setting, the main molding part 12 is fixedly installed on the upper mold plate 11. At this time, the main molding part 12 can be located in the upper filling cavity and participate in the molding process of the upper box casting.

[0047] On this basis, in order to solve the molding problem of the hinged seat 1002, a hinged molding part 14 is provided on the main molding part 12. The hinged molding part 14 is shaped similar to the contour of the hinged seat 1002. The hinged molding part 14 has a connecting hole 141, and the hinged molding part 14 is integrally connected to the main molding part 12. This can ensure that the dimensional accuracy of the hinged molding part 14 itself is at a high level. In addition, it can also improve the structural accuracy between the hinged molding part 14 and the main molding part 12. When making the casting, the structural accuracy of the cavity can be improved.

[0048] Furthermore, in order to overcome the problem of molding accuracy of the hinged hole, in this solution, the core pulling tube 13 is movably plugged into the connecting hole 141, which is equivalent to the core pulling tube 13 being able to be disassembled and assembled compared to the hinged molding part 14. Preferably, the size of the connecting hole 141 is adapted to the size of the core pulling tube 13, so that the gap between the two can be reduced as much as possible, and the connecting hole 141 can position the core pulling tube 13.

[0049] Based on the above structural setting, when the core pulling tube 13 is inserted into the connecting hole 141, under the support of the hinged molding part 14, the core pulling tube 13 can be accurately retained in the upper filling cavity, so that the core pulling tube 13 is not prone to structural deviation during the process of filling resin sand. Subsequently, the resin sand is filled in the upper filling cavity, and after waiting for the resin sand to solidify, the core pulling tube 13 is removed from the hinged molding part 14 to leave a precisely positioned hole structure in the mold cavity, and the hinge hole of the casting can be accurately formed. While improving the molding accuracy, the three-layer casting structure is simplified to a two-layer casting structure, and the complexity of the casting structure is also greatly reduced.

[0050] It is understandable that in the actual molding process, in order to facilitate the extraction of the core pulling tube 13 from the upper box casting, an escape hole for the core pulling tube 13 to pass through is provided on one side of the upper sand box, so that the core pulling tube 13 can be extracted from the outside of the upper box casting, which is convenient to use.

[0051] Furthermore, since the two opposite surfaces of the hinge seat 1002 are usually provided with some chamfer structures, and the mold is usually made of wood, it is difficult to perform precise chamfering due to structural space limitations. Therefore, in order to simplify the molding difficulty of the main molding part 12, a movable block structure is adopted here. Figure 3 Specifically, at least one side of the hinged forming portion 14 is provided with a flange slug 15, located near the end of the connection hole 141. In this embodiment, the flange slug 15 is provided on both sides, and the specific arrangement is not limited herein. Based on the above arrangement, the flange slug 15 can be processed separately to reduce the difficulty of shaping the interface.

[0052] Optionally, in order to improve the setting accuracy of the flange movable block 15, a recessed splicing groove 142 is provided on the side of the hinged forming portion 14 facing the flange movable block 15, and the outer edge contour of the splicing groove 142 coincides with the flange movable block 15; accordingly, the flange movable block 15 is provided with a splicing surface, which is a planar structure in this embodiment, and the splicing surface is spliced ​​and matched with the splicing groove 142. With the cooperation of the two, the flange movable block 15 is positioned, and the position is more accurate when setting.

[0053] Furthermore, the fitting clearance between the flange movable block 15 and the hinged forming part 14 is ≤0.5mm, for example, it can be controlled at intervals of 0.1mm, 0.3mm and 0.5mm. Among them, when the fitting clearance between the flange movable block 15 and the hinged forming part 14 is greater than 0.5mm, due to the smaller structure of the flange movable block 15, its offset degree will be too large, affecting the distance accuracy between adjacent hinge seats 1002.

[0054] Optionally, in order to simplify the difficulty of inserting and pulling the core pulling tube 13, the interior of the core pulling tube 13 is hollow, which can reduce the weight of the core pulling tube 13 and facilitate the insertion and pulling operation; at the same time, one end of the core pulling tube 13 is closed, and the closed end is used to be inserted into the upper filling cavity to prevent resin sand from flowing into the core pulling tube 13. At the same time, the other end of the core pulling tube 13 is provided with a pulling part to facilitate the staff to pull the core pulling tube 13 on the outside of the upper sand box.

[0055] Optionally, the pulling part specifically includes a pulling hole that passes through the inner and outer sides of the core pulling tube 13. The staff can pass a rope through the pulling hole and pull out the core pulling tube 13 under the traction of the rope; in other embodiments, the pulling part can also adopt a hanging ring structure, and a force point can also be formed by fixing the hanging ring on the core pulling tube 13. No matter what structure is adopted, any structure that can provide a force position for the core pulling tube 13 can be tried, and no specific limitation is made here.

[0056] Reference Figure 4 Because the support frame 1003 of the casting has a hollow structure, in order to realize the molding of this structure, a support frame movable block 16 is spliced ​​and arranged on the main molding part 12. The support frame movable block 16 is similar to the outline of the support frame 1003, and its number is the same as the number of support frames 1003, that is, two pairs; and the two pairs of support frame movable blocks 16 are respectively arranged on the opposite sides of the top of the main molding part 12; based on this, in order to facilitate the support frame movable block 16 to be more firmly arranged on the main molding part 12, a splicing groove is provided on the main molding part 12, and the splicing groove is similar to the bottom outline of the support frame movable block 16. By embedding the support frame movable block 16 into the splicing groove, a stable support effect is provided for the support frame movable block 16.

[0057] Furthermore, the fitting clearance between the support frame movable block 16 and the main molded part 12 is ≤1.0mm, and can specifically be 0.1mm, 0.5mm or 1.0mm; among them, since the structure of the support frame movable block 16 is relatively large, the overall error will also be correspondingly large. When the fitting clearance between the support frame movable block 16 and the main molded part 12 is greater than 1.0mm, the structure is easy to loosen. When the fitting clearance of the support frame movable block 16 is ≤1.0mm, the support frame movable block 16 can be firmly spliced ​​to the main molded part 12.

[0058] Reference Figure 5 The lower mold 2 mainly includes a lower mold plate 21. In this embodiment, the lower mold plate 21 is a flat structure. By placing a lower sand box on it, the lower mold plate 21 and the lower sand box form a lower filling cavity. Subsequently, resin sand is filled into the lower sand box and solidified to obtain a lower box casting mold.

[0059] Among them, if the bottom of the casting has an uneven pattern profile design, a contoured protruding structure can be set on the lower mold plate 21 to form the bottom surface profile of the casting on the lower box mold. The specific shape of the protruding structure is not limited here.

[0060] Further, look back Figure 1 In the tail plate casting shown in this embodiment, a plurality of positioning holes 1004 arranged in a rectangular shape are provided. The positioning holes 1004 pass through the upper and lower sides of the casting. In order to realize the molding of the positioning holes 1004, it is usually necessary to place a positioning hole sand core 5 in the mold cavity. If the positioning hole sand core 5 is offset during the pouring process, it will affect the molding of the positioning hole 1004.

[0061] Based on this, refer to Figure 5 The lower mold 2 also includes a lower positioning core head 22, wherein the lower positioning core head 22 is integrally connected to the lower mold plate 21, protruding toward the outside and presenting a truncated cone structure. The lower positioning core head 22 can form a lower positioning recess in the lower box mold for placing the positioning hole sand core 5. Before this, it is only necessary to adjust the bottom contour of the positioning hole sand core 5 to be the same as the contour of the lower positioning recess. By inserting the bottom end of the positioning hole sand core 5 into the lower positioning recess, a positioning effect can be achieved, so that the positioning hole sand core 5 is not easy to tilt or deflect in the mold cavity, and the forming of the positioning hole 1004 is guaranteed to a certain extent.

[0062] Further, refer to Figure 4An upper positioning core head 17 can also be provided on the main molding part 12. The position of the upper positioning core head 17 should be set corresponding to the lower positioning core head 22 to meet the requirements of structural accuracy; specifically, the upper positioning core head 17 also has a truncated cone structure. The upper positioning core head 17 is used to form an upper positioning recess in the upper box mold for placing the positioning hole sand core 5. At this time, the top end of the positioning hole sand core 5 can be inserted into the upper positioning recess, the top end of the positioning hole sand core 5 is further positioned, and the structural stability of the positioning hole sand core 5 is further optimized and improved.

[0063] Continue to refer to Figure 4 and Figure 5 In order to improve the accuracy of the closing of the upper box mold and the lower box mold, an upper locating pin 18 is installed on the upper mold die 1, and the upper locating pin 18 is used to form an upper locating pin hole in the upper box mold, and the lower mold die 2 is installed with a lower locating pin 23, and the lower locating pin 23 is used to form a lower locating pin hole in the lower box mold. The positions of the upper locating pin 18 and the lower locating pin 23 correspond to each other, so that when the upper box mold and the lower box mold are closed, the upper locating pin hole is opposite to the lower locating pin hole. At this time, before the upper box mold and the lower box mold are closed, the closing locating pins can be placed in the upper locating pin hole and the lower locating pin hole to ensure that the upper box mold and the lower box mold are accurately closed. The corresponding upper locating pins 18 and the lower locating pins 23 can be set in multiple groups, and the multiple groups of upper locating pins 18 and lower locating pins 23 are evenly arranged along the four sides. Generally, 3 groups are set to further optimize the closing accuracy of the upper box mold and the lower box mold.

[0064] It should be noted that, in the process of forming the tail plate casting, in addition to the positioning hole sand core 5, the main body sand core 3 and the hinge seat sand core 4 need to be placed in the mold cavity. Figure 6 As shown, the inner surface 6 of the mold cavity is shown. The main sand core 3 is mainly used to form the hollow part inside the sand core, and the hinge seat sand core 4 is used to form the bottom of the hinge seat 1002 and the hole characteristics of the casting. The molding process is as follows:

[0065] 1. Make the upper box casting mold: Brush mold paint on the surface of the upper mold 1 and the surface of the core-pulling steel pipe, and place the upper sand box according to the sand box positioning. Place two edge pressure risers, two straight runner ceramic tubes and multiple air outlet rods on the main mold according to the process requirements. Use a continuous resin sand mixer to put sand into the mold, manually assist in tamping, and scrape the upper surface of the sand mold flat; wait for the resin sand casting mold to solidify, and completely pull out the core-pulling steel pipe; then use a traveling crane to demould, that is, remove the upper mold 1, and turn over the upper box casting mold, manually repair the mold, flow coat the cavity, ignite and dry it for use.

[0066] 2. Make the lower box casting mold: brush the mold paint on the surface of the lower mold 2, and place the lower sand box according to the sand box positioning, place the chiller and sprue refractory bricks according to the process requirements, use a continuous resin sand sand mixer to put sand into the mold, manually assist in tamping, and scrape the upper surface of the sand mold flat; wait for the resin sand casting mold to solidify, use a driving crane to remove the mold, remove the lower mold 2, and turn the casting mold over; manually repair the mold, flow coat the casting cavity, ignite and dry it for use.

[0067] 3. Making sand cores: Use resin sand core boxes to make hinged seat sand cores 4, main body sand cores 3 and positioning hole sand cores 5;

[0068] 4. Lowering the core: Place the lower box casting in a flat pit, place the positioning hole sand core 5 according to the process requirements, place the main sand core 3 and the hinged seat sand core 4 in the mold cavity of the upper box casting, and seal the sand tightly to prevent it from falling when the box is turned over.

[0069] 5. After turning over the upper box mold, press the box closing positioning pin to smoothly close it on the lower box, install overflow riser and pouring basin on the top of the upper box, and tighten the upper box mold and the lower box mold with stud bolts, waiting for pouring.

[0070] Optionally, in the embodiment of the present invention, a one-piece, two-piece or four-piece injection molding machine tail plate mold can be used, and its connecting holes 141 are respectively provided with core pulling tubes 13. The core pulling molding operation is convenient and the structure is simple, which meets the production needs of single-piece small-batch injection molding machines and die-casting machine tail plate resin sand molding, and improves production efficiency and casting quality.

[0071] So far, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A tailgate casting resin sand molding mold, characterized in that: The invention comprises an upper mold (1) for molding an upper box casting mold and a lower mold (2) for molding a lower box casting mold, wherein the upper mold (1) comprises: An upper mold plate (11) is used for forming an upper box casting mold in conjunction with an upper sand box; A main body molding (12) is arranged on the upper mold plate (11), the main body molding (12) has a hinge molding portion (14), and the hinge molding portion (14) has a connecting hole (141); And a core-pulling tube (13), wherein the core-pulling tube (13) is movably plug-fitted with the connecting hole (141).

2. The tailgate casting resin sand molding mold according to claim 1, characterized in that: At least one side of the hinged forming portion (14) is provided with a flange movable piece (15), and the flange movable piece (15) is close to the end of the connecting hole (141).

3. The tailgate casting resin sand molding mold according to claim 2, characterized in that: A splicing groove (142) is provided on one side of the hinged forming portion (14), and a splicing surface is provided on the flange movable block (15), and the splicing surface is spliced ​​and matched with the splicing groove (142).

4. The tailgate casting resin sand molding mold according to claim 2 or 3, characterized in that: The fitting clearance between the flange movable piece (15) and the hinged forming portion (14) is ≤0.5 mm.

5. The tailgate casting resin sand molding mold according to claim 1, characterized in that: An upper positioning core head (17) is provided on the main body molding (12), and the upper positioning core head (17) is used to form an upper positioning recess in the upper box casting mold for placing the positioning hole sand core (5).

6. The tailgate casting resin sand molding mold according to claim 1, characterized in that: The core pulling tube (13) is hollow inside, one end is closed, and the other end is provided with a pulling portion.

7. The tailgate casting resin sand molding mold according to claim 1, characterized in that: The drawing portion specifically comprises a drawing hole that passes through both the inner and outer sides of the core pulling tube (13).

8. The tailgate casting resin sand molding mold according to claim 1, characterized in that: A support frame movable block (16) is spliced ​​onto the main body molded part (12), and a fitting clearance between the support frame movable block (16) and the main body molded part (12) is ≤1.0 mm.

9. The tailgate casting resin sand molding mold according to claim 1, characterized in that: The lower mold (2) comprises: A lower mold plate (21) is used for forming a lower box casting mold in conjunction with a lower sand box; and a lower positioning core head (22) arranged on the lower mold plate (21), wherein the lower positioning core head (22) is used to form a lower positioning recess in the lower box casting mold for placing the positioning hole sand core (5).

10. The resin sand molding mold for tailgate casting according to claim 1, characterized in that: The upper mold (1) is provided with an upper positioning pin (18), and the upper positioning pin (18) is used to form an upper positioning pin hole in the upper box casting mold. The lower mold (2) is provided with a lower positioning pin (23), and the lower positioning pin (23) is used to form a lower positioning pin hole in the lower box casting mold.

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