Sand core mold and casting mold for preparing sand core mold

Abstract

The utility model discloses a sand core mold and a casting mold for preparing the sand core mold, and belongs to the technical field of mold equipment. A three-point positioning assembly is arranged between the upper mold core and the lower mold core; an upper ejection assembly and a lower ejection assembly are respectively arranged at the upper end of the upper mold core and the lower end of the lower mold core; and a forming mechanism for forming a complex structure on the sand core mold main body is arranged in the forming cavity. By means of the mode, the three-point type positioning assembly, the upper ejection assembly and the lower ejection assembly are matched to achieve accurate positioning of the fixed mold and the movable mold, it is guaranteed that a casting is evenly stressed during ejection, and the yield of the casting is increased; the molding assembly I, the molding assembly II and the molding assembly III are matched together to mold a sand core mold main body with a complex structure; the through groove of the sand core mold main body is formed by matching the upper convex plate and the lower convex plate which are designed to be separated up and down, and the sections of the upper convex plate and the lower convex plate are gradually reduced outwards, so that the friction force to a forming part during mold splitting can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mold equipment, in particular to a sand core mold and a casting mold for preparing the sand core mold. Background Art

[0002] The automobile exhaust duct is an important component of the automobile exhaust system. Its components have complex shapes and need to have high strength, and are usually mass-produced through casting processes.

[0003] Chinese patent CN208929140U discloses an exhaust pipe casting mold, comprising an upper mold plate and a lower mold plate, wherein the upper mold plate and the lower mold plate are arranged layer by layer in sequence, one side of the upper mold plate is provided with an upper mold cavity, and one side of the lower mold plate is provided with a lower mold cavity that matches the upper mold cavity, wherein a first molding sand block and a second molding sand block for forming the internal pipe of the exhaust pipe are installed in the lower mold cavity, and the first molding sand block and the second molding sand block are plugged and matched, and a third molding sand block and a fourth molding sand block are further provided in the lower mold cavity, wherein the third molding sand block and the fourth molding sand block partially wrap the second molding sand block. However, the casting mold still has the following problems:

[0004] The component structure of the automobile exhaust duct is relatively complex, with many protrusions and depressions, making demolding more inconvenient. When the mold is forming a through-type groove, the friction is large, which may damage the casting or the mold during demolding.

[0005] Based on this, the utility model designs a sand core mold and a casting mold for preparing the sand core mold to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a sand core mold and a casting mold for preparing the sand core mold.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A sand core mold comprises a sand core mold body;

[0009] The sand core mold body is composed of a head structure and a tail structure, and a through groove is provided between the head and the tail of the sand core mold body;

[0010] The tail structure of the sand core mold body is set to be cylindrical, and the casting liquid flows into the tail structure;

[0011] The head structure of the sand core mold body includes a mold body 1 with complex multi-faceted surfaces and a mold body 2 with a concave design;

[0012] The mold body includes blocks, trapezoidal steps and cylindrical steps. The head of the sand core mold body is divided into a plurality of blocks by a plurality of gaps distributed in a straight line. The upper ends of the blocks on both sides are provided with trapezoidal steps, and the upper ends of the remaining blocks are provided with a plurality of cylindrical steps.

[0013] The mold body 2 includes a plurality of larger-sized recessed parts 1 and a plurality of smaller-sized recessed parts 2, which are arranged at the lower end of the head of the sand core mold body.

[0014] In order to better achieve the purpose of the present invention, the present invention also provides a casting mold for preparing a sand core mold, comprising a movable mold and a fixed mold;

[0015] The movable mold includes an upper mold core and an upper fixed plate fixedly installed at both ends of the upper mold core for supporting the upper mold core;

[0016] The fixed die includes a lower die core and a lower fixed plate fixedly installed at both ends of the lower die core for supporting the lower die core;

[0017] A three-point positioning assembly is provided between the upper die and the lower die to coordinate the positioning of the upper die and the lower die;

[0018] The upper end of the upper mold core and the lower end of the lower mold core are respectively provided with an upper ejection component and a lower ejection component for uniformly applying force to the sand core mold body;

[0019] An upper accommodating groove and a lower accommodating groove are respectively provided on the inner sides of the upper mold core and the lower mold core. When the upper mold core and the lower mold core are closed, the upper accommodating groove and the lower accommodating groove constitute a molding cavity for preparing the sand core mold body; a molding mechanism for forming a complex structure on the sand core mold body is provided in the molding cavity.

[0020] Furthermore, the forming mechanism includes a forming component 1 for forming a mold body 1, a forming component 2 for forming a mold body 2, and a forming component 3 for forming a through groove.

[0021] Furthermore, the forming component three includes an upper convex plate fixedly installed in the upper accommodating groove and a lower convex plate fixedly installed in the lower accommodating groove. When the upper mold core and the lower mold core are closed, the ends of the upper convex plate and the lower convex plate fit together.

[0022] Furthermore, the cross-sections of the upper convex plate and the lower convex plate gradually become smaller outwards.

[0023] Furthermore, the forming component 1 includes an upper protrusion, a lower protrusion, a groove 1 and a groove 2, a number of upper protrusions are fixedly installed on the edge of the upper accommodating groove, and a number of lower protrusions corresponding to the upper protrusions are fixedly installed in the lower accommodating groove; when the upper mold core and the lower mold core are closed, the ends of the upper protrusions and the lower protrusions fit together, and the upper protrusions and the lower protrusions cooperate to form a gap in the sand core mold body, so that the square is formed; the upper accommodating groove is also provided with a groove 1 for forming a trapezoidal step and a groove 2 for forming a cylindrical step.

[0024] Furthermore, the second forming component includes a plurality of protrusions 1 arranged in the lower receiving groove for forming the first recess and a plurality of protrusions 2 for forming the second recess.

[0025] Furthermore, the upper ejector rods are evenly distributed in the upper receiving groove, the lower ejector rods are evenly distributed in the lower receiving groove, and an upper ejector rod is provided in each groove one and groove two.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In the present invention, the three-point positioning assembly, the upper ejection assembly and the lower ejection assembly cooperate to achieve precise positioning of the fixed mold and the movable mold, and ensure that the casting is evenly stressed during ejection, thereby increasing the yield rate of the casting;

[0028] The sand core mold body with a complex structure can be formed by the cooperation of the forming component 1, the forming component 2 and the forming component 3;

[0029] The upper and lower convex plates designed to be separated from each other cooperate to form the through groove of the sand core mold body, which can reduce the friction on the molding part during mold separation. In addition, the cross-sections of the upper and lower convex plates gradually become smaller outwards, further increasing the ease of demoulding and reducing the occurrence of surface breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0031] Figure 1 Three-dimensional casting mold for preparing sand core mold Figure 1 ;

[0032] Figure 2 Three-dimensional casting mold for preparing sand core mold Figure 2 ;

[0033] Figure 3 Three-dimensional sand core mold Figure 1 ;

[0034] Figure 4 Three-dimensional casting mold for preparing sand core mold Figure 3 ;

[0035] Figure 5 Three-dimensional casting mold for preparing sand core mold Figure 4 ;

[0036] Figure 6 A three-dimensional view of the molding cavity of a casting mold for preparing a sand core mold.

[0037] The numbers in the figure represent:

[0038] 1. Moving mold; 11. Upper mold core; 12. Upper fixed plate; 13. Upper ejector pin; 14. Upper support plate; 15. Locating pin; 16. Upper receiving groove; 2. Fixed mold; 21. Lower mold core; 22. Lower fixed plate; 23. Lower ejector pin; 24. Lower support plate; 25. Locating hole; 26. Lower receiving groove; 3. Sand core mold body; 31. Through groove; 32. Gap; 33. Block; 34. Trapezoidal step; 35. Columnar step; 36. Recess 1; 37. Recess 2; 161. Upper convex plate; 162. Upper convex block; 163. Recess 1; 164. Recess 2; 261. Lower convex plate; 262. Lower convex block; 263. convex block 1; 264. convex block 2; 4. Inlet gate DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view. Example 1

[0041] In some embodiments, please refer to the appendix of the specification. Figure 3 , a sand core mold, comprising a sand core mold body 3;

[0042] The sand core mold body 3 is composed of a head structure and a tail structure, and a through groove 31 is provided between the head and the tail of the sand core mold body 3;

[0043] The tail structure of the sand core mold body 3 is set to be cylindrical, and the casting liquid flows into the tail structure;

[0044] The head structure of the sand core mold body 3 includes a mold body 1 with complex multi-faceted design and a mold body 2 with a concave design;

[0045] The mold body 1 includes blocks 33, trapezoidal steps 34 and cylindrical steps 35. The head of the sand core mold body 3 is divided into a plurality of blocks 33 by a plurality of gaps 32 distributed in a straight line. The upper ends of the blocks 33 on both sides are provided with trapezoidal steps 34, and the upper ends of the remaining blocks 33 are provided with a plurality of cylindrical steps 35.

[0046] The mold body 2 includes a plurality of larger-sized recessed portions 36 and a plurality of smaller-sized recessed portions 37 arranged at the lower end of the head of the sand core mold body 3 . Example 2

[0047] In some embodiments, as Figure 1-6 As shown, a casting mold for preparing a sand core mold includes a movable mold 1 and a fixed mold 2;

[0048] The movable mold 1 includes an upper mold core 11 and upper fixing plates 12 fixedly mounted at both ends of the upper mold core 11 for supporting the upper mold core 11;

[0049] The fixed mold 2 includes a lower mold core 21 and lower fixed plates 22 fixedly installed at both ends of the lower mold core 21 for supporting the lower mold core 21;

[0050] A three-point positioning assembly is provided between the upper mold core 11 and the lower mold core 21 for coordinating the positioning of the upper mold core 11 and the lower mold core 21;

[0051] The upper end of the upper mold core 11 and the lower end of the lower mold core 21 are respectively provided with an upper ejection component and a lower ejection component for uniformly applying force to the sand core mold body 3;

[0052] An upper accommodating groove 16 and a lower accommodating groove 26 are respectively provided on the inner sides of the upper mold core 11 and the lower mold core 21. When the upper mold core 11 and the lower mold core 21 are closed, the upper accommodating groove 16 and the lower accommodating groove 26 constitute a molding cavity for preparing the sand core mold body 3; a molding mechanism for forming a complex structure on the sand core mold body 3 is provided in the molding cavity.

[0053] The three-point positioning assembly includes positioning pins 15 and positioning holes 25. The three positioning pins 15 are fixedly installed at the lower end of the upper mold core 11 and distributed in a triangular shape on the outside of the molding cavity. The upper end of the lower mold core 21 is provided with three positioning holes 25 corresponding to the positioning pins 15. The positioning pins 15 and the positioning holes 25 are matched and plugged together to achieve precise positioning of the upper mold core 11 and the lower mold core 21. In addition, the positioning pins 15 distributed in a triangular shape make the force on the upper mold core 11 and the lower mold core 21 more uniform, further ensuring that the molding of the sand core mold body 3 meets the settings and reducing the defective rate of the sand core mold body 3.

[0054] The upper ejector assembly includes a plurality of upper ejector rods 13 mounted on the upper mold core 11 and an upper support plate 14 located on the upper side of the upper mold core 11 for supporting the upper ejector rods 13. One end of the upper ejector rod 13 passes through the upper mold core 11 and extends into the upper receiving groove 16 for ejecting the sand core mold body 3. The other end of the upper ejector rod 13 is fixedly connected to the upper support plate 14. The upper support plate 14 is movably arranged between the upper fixed plates 12.

[0055] The lower ejector assembly includes a plurality of lower ejector rods 23 mounted on the lower mold core 21 and a lower support plate 24 located on the lower side of the lower mold core 21 for supporting the lower ejector rods 23. One end of the lower ejector rod 23 passes through the lower mold core 21 and extends into the lower receiving groove 26 for ejecting the sand core mold body 3. The other end of the lower ejector rod 23 is fixedly connected to the lower support plate 24. The lower support plate 24 is arranged between the lower fixed plate 22 so as to move up and down.

[0056] The upper support plate 14 and the lower support plate 24 can be controlled to move up and down by providing a driving structure such as a cylinder.

[0057] The molding mechanism includes a molding component 1 for forming a mold body 1, a molding component 2 for forming a mold body 2, and a molding component 3 for forming a through groove 31;

[0058] The molding component three includes an upper convex plate 161 fixedly installed in the upper accommodating groove 16 and a lower convex plate 261 fixedly installed in the lower accommodating groove 26. When the upper mold core 11 and the lower mold core 21 are closed, the ends of the upper convex plate 161 and the lower convex plate 261 are fitted together. The upper convex plate 161 and the lower convex plate 261 designed to be separated from each other cooperate to form the through groove 31 of the sand core mold body 3, which can reduce the friction on the molding part during mold separation, and the cross-sections of the upper convex plate 161 and the lower convex plate 261 gradually become smaller outward, further increasing the ease of demolding and reducing the occurrence of surface breakage.

[0059] The molding component 1 includes an upper protrusion 162, a lower protrusion 262, a groove 163 and a groove 2 164. Several upper protrusions 162 are fixedly installed on the edge of the upper accommodating groove 16, and several lower protrusions 262 corresponding to the upper protrusions 162 are fixedly installed in the lower accommodating groove 26. When the upper mold core 11 and the lower mold core 21 are closed, the ends of the upper protrusions 162 and the lower protrusions 262 fit together, and the upper protrusions 162 and the lower protrusions 262 cooperate to form the gap 32 of the sand core mold body 3, so that the block 33 is formed. The upper accommodating groove 16 is also provided with a groove 163 for forming a trapezoidal step 34 and a groove 2 164 for forming a cylindrical step 35.

[0060] The second forming component includes a plurality of first protrusions 263 arranged in the lower receiving groove 26 for forming the first recess 36 and a plurality of second protrusions 264 for forming the second recess 37 .

[0061] The upper ejector rods 13 are evenly distributed in the upper receiving groove 16, and the lower ejector rods 23 are evenly distributed in the lower receiving groove 26. An upper ejector rod 13 is provided in each groove 163 and each groove 2 164. This ensures that the ejection force of the upper ejector rods 13 and the lower ejector rods 23 on the casting is uniform after the movable mold 1 and the mold are opened, especially on the various protruding parts of the casting. The position and length of each upper ejector rod 13 and the lower ejector rod 23 can be adjusted according to the configuration of the casting to meet the size requirements of castings with different configurations.

[0062] The front of the movable mold 1 and the fixed mold 2 is provided with a main inlet gate 4 for casting. After the casting liquid enters the movable mold 1 and the fixed mold 2 from the main inlet gate 4, it will first form the head structure of the sand core mold body 3, filling the complex and multi-faceted configuration to increase the yield of the sand core mold body 3.

[0063] 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 will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sand core mold, comprising a sand core mold body (3), characterized in that: The sand core mold body (3) is composed of a head structure and a tail structure, and a through groove (31) is provided between the head and tail of the sand core mold body (3); The tail structure of the sand core mold body (3) is set to be cylindrical, and the casting liquid flows into the tail structure; The head structure of the sand core mold body (3) includes a mold body 1 with complex multi-faceted surfaces and a mold body 2 with a concave design; The mold body 1 includes blocks (33), trapezoidal steps (34) and columnar steps (35). The head of the sand core mold body (3) is separated into a plurality of blocks (33) by a plurality of gaps (32) distributed in a straight line. The upper ends of the blocks (33) on both sides are provided with trapezoidal steps (34), and the upper ends of the remaining blocks (33) are provided with a plurality of columnar steps (35). The mold body 2 comprises a plurality of larger-sized recessed portions 1 (36) and a plurality of smaller-sized recessed portions 2 (37) arranged at the lower end of the head of the sand core mold body (3).

2. A casting mold for preparing a sand core mold, used for preparing the sand core mold according to claim 1, comprising a movable mold (1) and a fixed mold (2), characterized in that: The movable mold (1) comprises an upper mold core (11) and upper fixing plates (12) fixedly mounted at both ends of the upper mold core (11) for supporting the upper mold core (11); The fixed die (2) comprises a lower die core (21) and lower fixed plates (22) fixedly mounted at both ends of the lower die core (21) for supporting the lower die core (21); A three-point positioning assembly is provided between the upper mold core (11) and the lower mold core (21) for cooperating with the upper mold core (11) and the lower mold core (21) for positioning; An upper ejection assembly and a lower ejection assembly are respectively provided at the upper end of the upper mold core (11) and the lower end of the lower mold core (21), each of which has the function of applying force uniformly to the sand core mold body (3); An upper receiving groove (16) and a lower receiving groove (26) are respectively provided on the inner sides of the upper mold core (11) and the lower mold core (21). When the upper mold core (11) and the lower mold core (21) are closed, the upper receiving groove (16) and the lower receiving groove (26) form a molding cavity for preparing the sand core mold body (3); a molding mechanism for forming a complex structure on the sand core mold body (3) is provided in the molding cavity.

3. The casting mold for preparing a sand core mold according to claim 2, characterized in that: The forming mechanism comprises a forming component 1 for forming a mold body 1, a forming component 2 for forming a mold body 2, and a forming component 3 for forming a through groove (31).

4. The casting mold for preparing a sand core mold according to claim 3, characterized in that: The molding assembly three comprises an upper convex plate (161) fixedly mounted in the upper receiving groove (16) and a lower convex plate (261) fixedly mounted in the lower receiving groove (26). When the upper mold core (11) and the lower mold core (21) are closed, the ends of the upper convex plate (161) and the lower convex plate (261) fit together.

5. The casting mold for preparing a sand core mold according to claim 4, characterized in that: The cross-sections of the upper convex plate (161) and the lower convex plate (261) gradually become smaller outwards.

6. The casting mold for preparing a sand core mold according to claim 5, characterized in that: The molding component 1 includes an upper protrusion (162), a lower protrusion (262), a groove 1 (163) and a groove 2 (164), wherein a plurality of upper protrusions (162) are fixedly mounted on the edge of the upper receiving groove (16), and a plurality of lower protrusions (262) corresponding to the upper protrusions (162) are fixedly mounted in the lower receiving groove (26); when the upper mold core (11) and the lower mold core (21) are closed, the ends of the upper protrusions (162) and the lower protrusions (262) fit together, and the upper protrusions (162) and the lower protrusions (262) cooperate to form a gap (32) in the sand core mold body (3), so that the block (33) is formed; the upper receiving groove (16) is further provided with a groove 1 (163) for forming a trapezoidal step (34) and a groove 2 (164) for forming a columnar step (35).

7. The casting mold for preparing a sand core mold according to claim 6, characterized in that: The second forming component comprises a plurality of first protrusions (263) arranged in the lower receiving groove (26) for forming the first recess (36) and a plurality of second protrusions (264) for forming the second recess (37).

8. The casting mold for preparing a sand core mold according to claim 7, characterized in that: The upper ejector rods (13) are evenly distributed in the upper receiving groove (16), the lower ejector rods (23) are evenly distributed in the lower receiving groove (26), and an upper ejector rod (13) is provided in each groove 1 (163) and groove 2 (164).

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