Production method and production mold of cut-off plug based on coated sand process

Abstract

The invention discloses a cut-off plug gate production mold based on a coated sand process, comprising a first upper mold and a first lower mold, the first upper mold is provided with a vent hole and an ejection hole, the vent hole is provided with an exhaust plug, and the ejection hole is provided with an ejection rod; a middle casting molding groove and a side casting molding groove, the first lower mold is provided with a first give-way groove and a second give-way groove, the first give-way groove is provided with a first lower half sand-shooting hole, and the second give-way groove is provided with a second lower half sand-shooting hole; a middle casting molding protrusion and a side casting molding protrusion, the first upper mold is provided with a first mate and a second mate, the first mate is provided with a first upper half sand-shooting hole, and the second mate is provided with a second upper half sand-shooting hole; a semi-casting protrusion is provided at the bottom of the middle casting molding groove, semi-casting convex strips are provided on both sides of the semi-casting protrusion, and a casting port column is provided on the semi-casting convex strip. The invention can improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of production technology for a cut-off plug, and in particular to a production method and a production mold for a cut-off plug based on a coated sand process. Background Art

[0002] Railcar air brake system H26 There is a cut-off valve under the self-valve, which is used to close the brake pipe and cut off the passage of the main air cylinder to charge the brake pipe. The valve must be opened at the brake operating end and closed at the non-brake operating end. If the valve at the non-brake operating end is not closed and the self-valve handle is in the release position, the brake will not work if the brake is applied.

[0003] At present, the process for producing the cut-off plug valve is mostly to first manufacture the product mold of the cut-off plug valve for casting, and then use the product mold to produce the processing mold, that is, the sand mold for casting. Among them, the wax mold process is currently used to produce the processing mold, but the wax mold process requires a long cycle to produce the processing mold, and the wax mold is disposable, so there is a problem of low production efficiency in industrial production. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a cut-off plug valve production method and a production mold based on a coated sand process, so as to solve the technical problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides a truncated plug valve production mold based on coated sand technology, comprising:

[0006] A first upper die and a first lower die matched with the first upper die, wherein the first upper die is provided with a vent hole and an ejection hole, each of the vent holes is provided with an exhaust plug, and each of the ejection holes is movably provided with an ejection rod;

[0007] The first lower mold is provided with a middle casting groove and a side casting groove, two first clearance grooves and a second clearance groove are respectively provided on both sides of the first lower mold, a first lower half sand shooting hole communicating with the middle casting groove is provided at the bottom of the first clearance groove, and a second lower half sand shooting hole communicating with the side casting groove is provided at the bottom of the second clearance groove;

[0008] The first upper mold is provided with a middle casting protrusion and an edge casting protrusion, two first matching bodies and a second matching body are respectively provided on both sides of the first upper mold, the first matching body matches with the first giving way groove, the second matching body matches with the second giving way groove, the bottom of the first matching body is provided with a first upper half sand shooting hole matching with the first lower half sand shooting hole, the bottom of the second matching body is provided with a second upper half sand shooting hole matching with the second lower half sand shooting hole, when the first upper mold and the first lower mold are closed, a middle sand mold molding cavity is formed between the middle casting protrusion and the middle casting groove, and a side sand mold molding cavity is formed between the side casting protrusion and the side casting groove;

[0009] The bottom of the middle casting groove is provided with a long strip of semi-casting protrusion, and a plurality of semi-casting convex strips are provided on both sides of the semi-casting protrusion. A casting port column is vertically provided on the top of one end of the semi-casting convex strip away from the semi-casting protrusion, and the casting port column abuts against the middle casting protrusion. The middle sand mold molding cavity includes a semi-casting groove and a casting port. The semi-casting protrusion and the semi-casting convex strip form the semi-casting groove, and the casting port column forms the casting port.

[0010] A truncated plug body molding cavity can be formed between the X side of the middle sand mold molding cavity and one side of the edge sand mold molding cavity, a casting channel can be formed between the -X sides of the two middle sand mold molding cavities, and all the casting ports are connected to the truncated plug body molding cavity.

[0011] Furthermore, it also includes a second upper mold and a second lower mold matched with the second upper mold, the second upper mold is provided with the vent hole and the ejection hole, the second lower mold is also provided with four support body lower half grooves and four third lower half sand shooting holes, each of the third lower half sand shooting holes is communicated with one of the support body lower half grooves, the second upper mold is provided with four support body upper half grooves and four third upper half sand shooting holes, each of the third upper half sand shooting holes is communicated with one of the support body upper half grooves, a support column is arranged in the middle of the support body upper half groove, and flange forming holes are arranged at the top of both ends, when the second upper mold is molded with the second lower mold, a support body forming cavity is formed between the support body upper half groove and the support body lower half groove.

[0012] Furthermore, the second lower mold is provided with two center body lower half grooves and two fourth lower half sand shooting holes, and the two fourth lower half sand shooting holes are respectively communicated with the two center body lower half grooves; the second upper mold is also provided with two center body upper half grooves and two fourth upper half sand shooting holes, and the two fourth upper half sand shooting holes are respectively communicated with the two center body upper half grooves; a center body forming cavity is formed between the center body upper half groove and the center body lower half groove, and the two ends of the center body forming cavity can be respectively connected with the middle parts of the two support body forming cavities.

[0013] Furthermore, a plurality of the semi-cast convex strips are axially symmetrically distributed on both sides of the semi-cast convex strip, a first groove body is provided in the middle of the middle casting molding groove, a first convex strip matching with the first groove body is provided in the middle of the middle casting molding groove, the shape of the first groove body matches with the shape of half of the outer wall of the semi-cast convex strip and the semi-cast convex strip, and the shape of the first convex strip matches with the shape of the other half of the outer wall of the semi-cast convex strip and the semi-cast convex strip.

[0014] Furthermore, a second groove body is provided around the middle casting protrusion, and a set distance is provided between the periphery of the second groove body and the periphery of the inner wall of the middle sand mold molding cavity;

[0015] A second protrusion is arranged around the edge casting protrusion, the shape of the second protrusion matches the shape of the second trough body, and a set distance is formed between the periphery of the second protrusion and the periphery of the inner wall of the edge sand mold molding cavity.

[0016] Furthermore, a first venting groove is provided on the second upper mold, one end of the first venting groove is located in the middle of the second upper mold, and the other end passes through the edge of the second upper mold, and a second venting groove matching the first venting groove is provided on the second lower mold.

[0017] Furthermore, a third exhaust groove is formed on the first upper mold, both ends of the third exhaust groove pass through the first upper mold, and a fourth exhaust groove matching with the third exhaust groove is formed on the first lower mold.

[0018] The present invention provides a method for producing a truncated plug gate using a production mold based on a coated sand process as described above, comprising the following steps:

[0019] S1, heating the first upper mold and the first lower mold and closing the molds;

[0020] S2, injecting sand into the middle sand mold forming cavity and the side sand mold forming cavity through the first upper half sand shooting hole and the first lower half sand shooting hole, the second upper half sand shooting hole and the second lower half sand shooting hole, respectively, wherein a middle casting sand mold is formed in the middle sand mold forming cavity, and a side casting sand mold is formed in the side sand mold forming cavity;

[0021] S3, heating and maintaining the temperature of the sand;

[0022] S4, after the middle casting sand mold and the side casting sand mold are finalized, the first upper mold is raised, and the ejector rod, driven by the cylinder, ejects the middle casting sand mold and the side casting sand mold adhered to the middle casting molding protrusion and the side casting molding protrusion;

[0023] S5, assembling the two support bodies to a central body, and connecting the combined support body and central body structure to a side casting sand mold;

[0024] S6, buckling the middle casting sand mold onto the side casting sand mold;

[0025] S7, connecting the two middle casting sand molds at one side facing away from the side casting sand molds;

[0026] S8, casting into the half casting groove between the two middle casting sand molds, and the liquid flows into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body and the support body through the casting port;

[0027] S10, after cooling and finalizing, the sand mold is broken and the product is taken out.

[0028] The beneficial effects of the cut-off plug gate production mold based on the coated sand process provided by the present invention are as follows: first, the first upper mold and the first lower mold are heated and molded; then, sand is injected into the middle sand mold molding cavity and the side sand mold molding cavity through the first upper half sand shooting hole and the first lower half sand shooting hole, the second upper half sand shooting hole and the second lower half sand shooting hole, wherein a middle casting sand mold is formed in the middle sand mold molding cavity, and a side casting sand mold is formed in the side sand mold molding cavity, and the sand is heated and maintained; after the middle casting sand mold and the side casting sand mold are finalized, the first upper mold is raised, and the ejector rod is driven by the cylinder to eject the adhesive The middle casting sand mold and the side casting sand mold attached to the middle casting molding protrusion and the side casting molding protrusion are ejected; two support bodies are assembled on a central body, and the combined support body and the central body structure are connected to the side casting sand mold; the middle casting sand mold is buckled onto the side casting sand mold; the two middle casting sand molds are connected on one side away from the side casting sand mold; casting is performed into the semi-casting grooves between the two middle casting sand molds, and liquid flows into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body and the support body through the casting port; the sand mold is broken after cooling and shaping, and the product is taken out.

[0029] The first upper mold and the first lower mold in the present application can be used reciprocatingly, so in the actual production process, they can be put into production in a short time according to the situation, ensuring production efficiency; secondly, the time for producing the middle casting sand mold and the side casting sand mold using the structure of the present application is also short, thus greatly saving production time. Secondly, during the actual casting, the two middle casting sand molds and the two side casting sand molds are cast at the same time, and 2, 4 or more truncated plug gate bodies can be cast each time, thereby further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The structure of the first upper mold and the first lower mold in the production mold of the cut-off plug gate based on the coated sand process provided by the present invention is schematically shown in FIG. Figure 1 ;

[0031] Figure 2 yes Figure 1 A magnified view of part A;

[0032] Figure 3 The structure of the first upper mold and the first lower mold in the production mold of the cut-off plug gate based on the coated sand process provided by the present invention is schematically shown in FIG. Figure 2 ;

[0033] Figure 4 yes Figure 3 A magnified view of part B;

[0034] Figure 5 yes Figure 3 Enlarged view of part C;

[0035] Figure 6 It is a schematic diagram of an embodiment of a first lower mold in a truncated plug gate production mold based on a coated sand process provided by the present invention;

[0036] Figure 7 It is a schematic diagram of an embodiment of a first upper mold in a truncated plug gate production mold based on a coated sand process provided by the present invention;

[0037] Figure 8 The structure diagram of the second upper mold and the second lower mold in the cut-off plug gate production mold based on the coated sand process provided by the present invention is as follows: Figure 1 ;

[0038] Fig. 9 yes Figure 8 A magnified view of part D in the middle;

[0039] Fig.10 The structure diagram of the second upper mold and the second lower mold in the cut-off plug gate production mold based on the coated sand process provided by the present invention is as follows: Figure 2 ;

[0040] Fig.11 yes Fig.10 Enlarged view of part E in the middle;

[0041] Fig.12 It is a structural schematic diagram of an embodiment of a second lower mold in a truncated plug gate production mold based on a coated sand process provided by the present invention;

[0042] Fig.13 It is a structural schematic diagram of an embodiment of a second upper mold in a truncated plug gate production mold based on a coated sand process provided by the present invention.

[0043] Numbers in the figure: 1, first upper mold; 2, first lower mold; 3a, vent hole; 3b, ejection hole; 4, middle casting groove; 5, side casting groove; 6, first clearance groove; 7, second clearance groove; 8, first lower half sand-shooting hole; 9, second lower half sand-shooting hole; 10, middle casting protrusion; 11, side casting protrusion; 12, first matching body; 13, second matching body; 14, first upper half sand-shooting hole; 15, second upper half sand-shooting hole; 16, semi-casting protrusion; 17, semi-casting convex strip; 18, casting port column; 19 , second upper die; 20, second lower die; 21, lower half groove of support body; 22, third lower half sanding hole; 23, upper half groove of support body; 24, third upper half sanding hole; 25, support column; 26, flange forming hole; 27, lower half groove of center body; 28, fourth lower half sanding hole; 29, upper half groove of center body; 30, fourth upper half sanding hole; 31, first groove body; 32, first protrusion; 33, second groove body; 34, second protrusion; 35, first exhaust groove; 36, second exhaust groove; 37, third exhaust groove; 38, fourth exhaust groove. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0045] like Figures 1 to 13 As shown,

[0046] A truncated plug gate production mold based on coated sand technology, comprising:

[0047] A first upper mold 1, and a first lower mold 2 matched with the first upper mold 1, wherein the first upper mold 1 is provided with a vent hole 3a and an ejection hole 3b, each of the vent holes 3a is provided with an exhaust plug, and each of the ejection holes 3b is movably provided with an ejection rod;

[0048] The first lower mold 2 is provided with a middle casting groove 4 and a side casting groove 5, and two first make way grooves 6 and second make way grooves 7 are respectively provided on both sides of the first lower mold 2. A first lower half sand-shooting hole 8 communicating with the middle casting groove 4 is provided at the bottom of the first make way groove 6, and a second lower half sand-shooting hole 9 communicating with the side casting groove 5 is provided at the bottom of the second make way groove 7;

[0049] The first upper mold 1 is provided with a middle casting protrusion 10 and a side casting protrusion 11, and two first matching bodies 12 and second matching bodies 13 are respectively provided on both sides of the first upper mold 1, the first matching body 12 cooperates with the first giving way groove 6, and the second matching body 13 cooperates with the second giving way groove 7, the bottom of the first matching body 12 is provided with a first upper half sand hole 14 that cooperates with the first lower half sand hole 8, and the bottom of the second matching body 13 is provided with a second upper half sand hole 15 that cooperates with the second lower half sand hole 9, when the first upper mold 1 and the first lower mold 2 are molded together, a middle sand mold molding cavity is formed between the middle casting protrusion 10 and the middle casting groove 4, and a side sand mold molding cavity is formed between the side casting protrusion 11 and the side casting groove 5;

[0050] The bottom of the middle casting groove 4 is provided with a long strip of semi-casting protrusion 16, and a plurality of semi-casting convex strips 17 are provided on both sides of the semi-casting protrusion 16. A casting port column 18 is vertically provided on the top of one end of the semi-casting convex strip 17 away from the semi-casting protrusion 16, and the casting port column 18 abuts against the middle casting protrusion 10. The middle sand mold molding cavity includes a semi-casting groove and a casting port. The semi-casting protrusion 16 and the semi-casting convex strip 17 form the semi-casting groove, and the casting port column 18 forms the casting port.

[0051] A truncated plug body molding cavity can be formed between the X side of the middle sand mold molding cavity and one side of the edge sand mold molding cavity, a casting channel can be formed between the -X sides of the two middle sand mold molding cavities, and all the casting ports are connected to the truncated plug body molding cavity.

[0052] The truncated plug gate production mold based on the coated sand process also includes a second upper mold 19 and a second lower mold 20 matched with the second upper mold 19, the second upper mold 19 is provided with the vent hole 3a and the ejection hole 3b, the second lower mold 20 is also provided with four support body lower half grooves 21 and four third lower half sand shooting holes 22, each of the third lower half sand shooting holes 22 is communicated with one of the support body lower half grooves 21, the second upper mold 19 is provided with four support body upper half grooves 23 and four third upper half sand shooting holes 24, each of the third upper half sand shooting holes 24 is communicated with one of the support body upper half grooves 23, a support column 25 is arranged in the middle of the support body upper half groove 23, and flange forming holes 26 are arranged on the tops of both ends, when the second upper mold 19 and the second lower mold 20 are molded together, a support body forming cavity (for producing a support body sand mold) is formed between the support body upper half groove 23 and the support body lower half groove 21.

[0053] The second lower mold 20 is also provided with two center body lower half grooves 27 and two fourth lower half sand shooting holes 28, and the two fourth lower half sand shooting holes 28 are respectively communicated with the two center body lower half grooves 27. The second upper mold 19 is also provided with two center body upper half grooves 29 and two fourth upper half sand shooting holes 30, and the two fourth upper half sand shooting holes 30 are respectively communicated with the two center body upper half grooves 29. A center body molding cavity (for producing a center body sand mold) is formed between the center body upper half groove 29 and the center body lower half groove 27, and the two ends of the center body molding cavity can be respectively connected to the middle parts of the two support body molding cavities.

[0054] A plurality of the semi-cast convex strips 17 are axially symmetrically distributed on both sides of the semi-cast protrusion 16, a first groove body 31 is opened in the middle of the middle casting molding groove 4, and a first protrusion 32 matching with the first groove body 31 is arranged in the middle of the middle casting molding groove 4, the shape of the first groove body 31 matches the shape of half of the outer wall of the semi-cast protrusion 16 and the semi-cast convex strip 17, and the shape of the first protrusion 32 matches the shape of the other half of the outer wall of the semi-cast protrusion 16 and the semi-cast convex strip 17.

[0055] A second groove body 33 is provided around the middle casting protrusion 10, and a set distance is formed between the periphery of the second groove body 33 and the periphery of the inner wall of the middle sand mold molding cavity;

[0056] A second protrusion 34 is arranged around the edge casting protrusion 11. The shape of the second protrusion 34 matches the shape of the second groove body 33. The periphery of the second protrusion 34 has a set distance from the periphery of the inner wall of the edge sand mold molding cavity.

[0057] A first venting groove 35 is provided on the second upper mold 19 , one end of the first venting groove 35 is located in the middle of the second upper mold 19 , and the other end passes through the edge of the second upper mold 19 . A second venting groove 36 matching the first venting groove 35 is provided on the second lower mold 20 .

[0058] The first upper mold 1 is provided with a third exhaust groove 37 , both ends of which penetrate the first upper mold 1 , and the first lower mold 2 is provided with a fourth exhaust groove 38 matched with the third exhaust groove 37 .

[0059] A method for producing a truncated plug gate using a production mold based on a coated sand process as described above, comprising the following steps:

[0060] S1, heating the first upper mold 1 and the first lower mold 2 and closing the molds;

[0061] S2, injecting sand into the middle sand mold forming cavity and the side sand mold forming cavity through the first upper half sand shooting hole 14 and the first lower half sand shooting hole 8, the second upper half sand shooting hole 15 and the second lower half sand shooting hole 9 respectively, wherein a middle casting sand mold is formed in the middle sand mold forming cavity, and a side casting sand mold is formed in the side sand mold forming cavity;

[0062] S3, heating and maintaining the temperature of the sand;

[0063] S4, after the middle casting sand mold and the side casting sand mold are finalized, the first upper mold 1 is raised, and the ejector rod, driven by the cylinder, ejects the middle casting sand mold and the side casting sand mold adhered to the middle casting molding protrusion 10 and the side casting molding protrusion 11;

[0064] S5, assembling the two support bodies to a central body, and connecting the combined support body and central body structure to a side casting sand mold;

[0065] S6, buckling the middle casting sand mold onto the side casting sand mold;

[0066] S7, connecting the two middle casting sand molds at one side facing away from the side casting sand molds;

[0067] S8, casting into the half casting groove between the two middle casting sand molds, and the liquid flows into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body and the support body through the casting port;

[0068] S10, after cooling and finalizing, the sand mold is broken and the product is taken out.

[0069] First, the first upper mold 1 and the first lower mold 2 are heated and molded; then, sand is injected into the middle sand mold molding cavity and the side sand mold molding cavity through the first upper half sand shooting hole 14 and the first lower half sand shooting hole 8, the second upper half sand shooting hole 15 and the second lower half sand shooting hole 9, respectively, wherein a middle casting sand mold is formed in the middle sand mold molding cavity, and a side casting sand mold is formed in the side sand mold molding cavity, and the sand is heated and maintained; after the middle casting sand mold and the side casting sand mold are finalized, the first upper mold 1 is raised, and the ejector rod, under the driving action of the cylinder, pushes the ejector rod adhered to the middle casting molding protrusion 10 and The middle casting sand mold and the side casting sand mold on the side casting molding protrusion 11 are ejected; the two support bodies are assembled on a central body, and the combined support body and the central body structure are connected to the side casting sand mold; the middle casting sand mold is buckled onto the side casting sand mold; the two middle casting sand molds are connected on one side away from the side casting sand mold; casting is performed into the semi-casting groove between the two middle casting sand molds, and the liquid flows into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body and the support body through the casting port; the sand mold is broken after cooling and shaping, and the product is taken out.

[0070] The first upper mold 1 and the first lower mold 2 in the present application can be used reciprocatingly, so in the actual production process, they can be put into production in a short time according to the situation, ensuring production efficiency; secondly, the time for producing the middle casting sand mold and the side casting sand mold using the structure of the present application is also short, thus greatly saving production time. Secondly, during the actual casting, the two middle casting sand molds and the two side casting sand molds are cast at the same time, and 2, 4 or more truncated plug gate bodies can be cast each time, thereby further improving production efficiency.

[0071] The second upper mold 19 and the second lower mold 20 are used to produce support bodies and center bodies, wherein the support bodies are used to support the center bodies between the middle casting sand mold and the side casting sand mold; at the same time, the second upper mold 19 and the second lower mold 20 produce four support bodies and two center bodies each time they are cast, and at the same time, every two pairs of middle casting sand molds and side casting sand molds can produce two truncated plug bodies, so that the number of support bodies and center bodies are corresponding, that is, the production cycles of the first upper mold 1 and the first lower mold 2, the second upper mold 19 and the second lower mold 20 are the same or close, and the cycle of overall sand mold assembly and casting can be shortened to a shorter level.

[0072] When producing the support body, sand is shot into the support body lower half groove 21 and the support body upper half groove 23 from the third upper half sand shooting hole 24 and the third lower half sand shooting hole 22. The middle part of the support body formed after molding has a groove due to the existence of the support column 25, wherein the groove is used to connect with the end of the center body; secondly, the existence of the flange forming hole 26 enables both ends of the support body to generate a columnar structure, and this columnar structure will form flange holes on the flanges at both ends of the truncated valve body when casting the truncated valve body; and the distance between the two support bodies is the distance between the two flanges; and the center body forms a hollow shape in the middle of the truncated valve body.

[0073] The semi-casting protrusion 16 is semicircular, so the middle part of the cast middle casting sand mold is also provided with a semicircular partial channel, so that the liquid can flow better during casting; at the same time, since the casting port column 18 is in contact with the middle casting molding protrusion 10, a casting port exists on the middle casting sand mold, so that the liquid can flow into the molding cavity.

[0074] Moreover, since a first groove body 31 is provided on one side of the semi-casting protrusion 16 and the semi-casting protrusion 17, and a first protrusion 32 is provided on the other side, corresponding protrusions and grooves are formed at corresponding positions of the middle casting sand mold; since the -X sides of the two middle casting sand molds are relative to each other during casting, the protrusion on one of the middle casting sand molds can be snapped into the groove on the other middle casting sand mold, so that the two middle casting sand molds can fit well together, and relative movement between the two can be prevented, thereby improving casting stability and accuracy.

[0075] Moreover, since the middle casting protrusion 10 has a second groove body 33 at its periphery, the X side of the middle casting sand mold has a corresponding protrusion; and the side casting protrusion 11 has a second protrusion 34 at its periphery, the side of the side casting sand mold close to the middle casting sand mold has a corresponding protrusion; therefore, when the middle casting sand mold is combined with the side casting sand mold, the two can also be well buckled, thereby improving the stability and accuracy of casting.

[0076] Moreover, due to the distance between the periphery of the second trough body 33 and the inner wall of the middle sand mold forming cavity, the X-side periphery of the middle casting sand mold is stepped. Similarly, the side of the side casting sand mold close to the middle casting sand mold is also stepped to match the middle casting sand mold, which can better improve the sealing and connection stability of the two.

[0077] The first vent groove 35 and the second vent groove 36 enable the second lower mold 20 and the second upper mold 19 to better discharge the air in the middle when the molds are closed, so that the sand can be better injected into the support body molding cavity and the center body molding cavity; similarly, the third vent groove 37 and the fourth vent groove 38 can better discharge the air in the middle during the closing process of the first upper mold 1 and the first lower mold 2, so as to better cast the middle casting sand mold and the edge casting sand mold.

[0078] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0079] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A truncated plug gate production mold based on coated sand technology, characterized by: include, A first upper mold (1), and a first lower mold (2) matched with the first upper mold (1), wherein the first upper mold (1) is provided with a vent hole (3a) and an ejection hole (3b), each of the vent holes (3a) is provided with an exhaust plug, and each of the ejection holes (3b) is movably provided with an ejection rod; The first lower mold (2) is provided with a middle casting groove (4) and a side casting groove (5); two first clearance grooves (6) and a second clearance groove (7) are respectively provided on two sides of the first lower mold (2); a first lower half sand-shooting hole (8) communicating with the middle casting groove (4) is provided at the bottom of the first clearance groove (6); and a second lower half sand-shooting hole (9) communicating with the side casting groove (5) is provided at the bottom of the second clearance groove (7); The first upper mold (1) is provided with a middle casting protrusion (10) and a side casting protrusion (11), and two first matching bodies (12) and second matching bodies (13) are respectively provided on both sides of the first upper mold (1), the first matching body (12) matches with the first giving way groove (6), and the second matching body (13) matches with the second giving way groove (7), the bottom of the first matching body (12) is provided with a first upper half sand-shooting hole (14) matching with the first lower half sand-shooting hole (8), and the bottom of the second matching body (13) is provided with a second upper half sand-shooting hole (15) matching with the second lower half sand-shooting hole (9), when the first upper mold (1) and the first lower mold (2) are molded together, a middle sand mold molding cavity is formed between the middle casting protrusion (10) and the middle casting groove (4), and a side sand mold molding cavity is formed between the side casting protrusion (11) and the side casting groove (5); The bottom of the middle casting groove (4) is provided with a long strip of semi-casting protrusion (16), and a plurality of semi-casting convex strips (17) are provided on both sides of the semi-casting protrusion (16). A casting port column (18) is vertically provided on the top of one end of the semi-casting convex strip (17) away from the semi-casting protrusion (16), and the casting port column (18) contacts the middle casting protrusion (10). The middle sand mold molding cavity includes a semi-casting groove and a casting port. The semi-casting protrusion (16) and the semi-casting convex strip (17) form the semi-casting groove, and the casting port column (18) forms the casting port. A truncated plug body molding cavity can be formed between the X side of the middle sand mold molding cavity and one side of the edge sand mold molding cavity, a casting channel can be formed between the -X sides of the two middle sand mold molding cavities, and all the casting ports are connected to the truncated plug body molding cavity; It also includes a second upper mold (19) and a second lower mold (20) matched with the second upper mold (19), the second upper mold (19) and the second lower mold (20) are used to produce a support body and a center body, the support body is used to support the center body between a middle casting sand mold formed by the middle sand mold forming cavity and a side casting sand mold formed by the side sand mold forming cavity; The second upper mold (19) is provided with the vent hole (3a) and the ejection hole (3b); the second lower mold (20) is also provided with four support body lower half grooves (21) and four third lower half sanding holes (22); each of the third lower half sanding holes (22) is communicated with one of the support body lower half grooves (21); the second upper mold (19) is provided with four support body upper half grooves (23) and four third upper half sanding holes (24); each of the third upper half sanding holes (24) is communicated with one of the support body upper half grooves (23); a support column (25) is provided in the middle of the support body upper half groove (23); flange forming holes (26) are provided at the tops of both ends; when the second upper mold (19) and the second lower mold (20) are molded together, a support body forming cavity is formed between the support body upper half groove (23) and the support body lower half groove (21); The second lower mold (20) is also provided with two lower center body grooves (27) and two fourth lower half sanding holes (28), and the two fourth lower half sanding holes (28) are respectively communicated with the two lower center body grooves (27); the second upper mold (19) is also provided with two upper center body grooves (29) and two fourth upper half sanding holes (30), and the two fourth upper half sanding holes (30) are respectively communicated with the two upper center body grooves (29); a center body forming cavity is formed between the upper center body groove (29) and the lower center body groove (27), and the two ends of the center body forming cavity can be respectively connected with the middle of the two support body forming cavities; During production, two support bodies are assembled onto a central body, and the combined support body and the central body structure are connected to the side casting sand mold, the middle casting sand mold is buckled onto the side casting sand mold, the two middle casting sand molds are connected on one side away from the side casting sand mold, and casting is performed into the semi-casting groove between the two middle casting sand molds, and the casting liquid flows through the casting port into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body, and the support body.

2. The truncated plug gate production mold based on the coated sand process according to claim 1 is characterized in that: A plurality of the semi-casting convex strips (17) are axially symmetrically distributed on both sides of the semi-casting protrusion (16); a first groove body (31) is provided in the middle of the middle casting groove (4); a first protrusion (32) matched with the first groove body (31) is provided in the middle of the middle casting groove (4); the shape of the first groove body (31) matches the shape of half of the outer wall of the semi-casting protrusion (16) and the semi-casting convex strip (17); the shape of the first protrusion (32) matches the shape of the other half of the outer wall of the semi-casting protrusion (16) and the semi-casting convex strip (17).

3. The cut-off plug gate production mold based on the coated sand process according to claim 2 is characterized in that: A second groove body (33) is provided around the middle casting protrusion (10), and a set distance is formed between the periphery of the second groove body (33) and the periphery of the inner wall of the middle sand mold molding cavity; A second protrusion (34) is arranged around the edge casting protrusion (11), the shape of the second protrusion (34) matches the shape of the second groove body (33), and the periphery of the second protrusion (34) has a set distance from the periphery of the inner wall of the edge sand mold molding cavity.

4. The cut-off plug gate production mold based on the coated sand process according to claim 3 is characterized by: The second upper mold (19) is provided with a first exhaust groove (35), one end of the first exhaust groove (35) is located in the middle of the second upper mold (19), and the other end passes through the edge of the second upper mold (19), and the second lower mold (20) is provided with a second exhaust groove (36) that matches the first exhaust groove (35).

5. The truncated plug gate production mold based on the coated sand process according to any one of claims 1 to 4, characterized in that: The first upper mold (1) is provided with a third exhaust groove (37), both ends of which pass through the first upper mold (1), and the first lower mold (2) is provided with a fourth exhaust groove (38) which matches the third exhaust groove (37).

6. A method for producing using the truncated plug gate production mold based on the coated sand process as described in any one of claims 1 to 5, characterized in that: The following steps are included: S1, heating the first upper mold (1) and the first lower mold (2) and closing the molds; S2, injecting sand into the middle sand mold forming cavity and the side sand mold forming cavity through the first upper half sand shooting hole (14), the first lower half sand shooting hole (8), the second upper half sand shooting hole (15) and the second lower half sand shooting hole (9), respectively, wherein a middle casting sand mold is formed in the middle sand mold forming cavity, and a side casting sand mold is formed in the side sand mold forming cavity; S3, heating and maintaining the temperature of the sand; S4, after the middle casting sand mold and the side casting sand mold are finalized, the first upper mold (1) is raised, and the ejector rod, driven by the cylinder, ejects the middle casting sand mold and the side casting sand mold adhered to the middle casting molding protrusion (10) and the side casting molding protrusion (11); S5, assembling the two support bodies to a central body, and connecting the combined support body and central body structure to a side casting sand mold; S6, buckling the middle casting sand mold onto the side casting sand mold; S7, connecting the two middle casting sand molds at one side facing away from the side casting sand molds; S8, casting into the half casting groove between the two middle casting sand molds, and the liquid flows into the cavity formed by the middle casting sand mold, the side casting sand mold, the support body and the support body through the casting port; S10, after cooling and finalizing, the sand mold is broken and the product is taken out.

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