Half mold sand core head positioning method and Half mold forming device
By setting a sealing strip on the core head of the Hav mold sand core and fixing it to the casting mold, the problems of center difference and edge errors in the Hav mold hole caused by the traditional sand core positioning method are solved, and the accuracy and stability of the Hav mold hole are achieved.
Patent Information
- Application Number
- CN202311458592.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-03
- Publication Date
- 2025-05-06
AI Technical Summary
Traditional sand core positioning methods lead to poor centrality of the inner hole of the Hav mold and the wrong edges of the inner holes when combined, which may cause the Hav mold to be scrapped in severe cases.
A method of positioning the core head of the Hav mold sand core is adopted, including making the sand core, hoisting the sand core and fixing its bottom core head on the lower casting mold, setting a sealing strip above the core head at both ends of the sand core, and pressing the sealing strip through the upper casting mold to fix the position of the sand core.
Through this method, the center degree and accuracy of the inner hole of the Hav mold are improved, and the sand core is prevented from moving during casting, ensuring the mass stability of the Hav mold.
Smart Images
Figure CN119927147A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of metal metallurgy, and in particular to a method for positioning a core head of a half mold sand core and a half mold forming device. Background Art
[0002] The half mold is an iron shell mold used for vacuum smelting alloy ingots. Since the half mold is cast in two parts (the left and right halves of the half mold are cast separately), the two halves need to be combined and fixed by bolts or positioning pins when used. The inner hole of the half mold is usually cast with a sand core, but the inner hole length exceeds 2m. The traditional positioning method of the two sides of the sand core causes the center difference of the inner hole of the half mold and the problem of the inner hole misalignment when merging. In severe cases, the half mold may be scrapped. Therefore, it is necessary to design a new sand core positioning method to ensure the positioning accuracy and quality stability of the inner hole size of the half mold. Summary of the invention
[0003] In view of the problem of poor centering of the inner hole of the half mold and misalignment of the inner hole when merging caused by the traditional sand core positioning method, the present application provides a half mold sand core positioning method to solve the above problems.
[0004] A method for positioning a core head of a Haff mold sand core comprises the following steps:
[0005] Making sand cores;
[0006] Lifting the sand core, and fixing the core head at the bottom of the sand core to the lower casting mold;
[0007] Sealing strips are respectively arranged above the core heads at both ends of the sand core;
[0008] The upper mold is placed on top of the lower mold so that the upper mold presses the sealing strip.
[0009] In an practicable solution, making the sand core further comprises the following steps:
[0010] A core bone is arranged inside the sand core;
[0011] At least one layer of graphite coating is arranged on the surface of the sand core.
[0012] In an practicable solution, before hoisting the sand core and fixing the bottom of the sand core to the lower casting mold, the method further includes:
[0013] Filling a lower sand mold in the lower box of the lower casting mold;
[0014] A first groove is formed in the lower sand mold, and the first groove is used to fit and accommodate the sand core.
[0015] In an practicable solution, hoisting the sand core and fixing the bottom core head of the sand core to the lower casting mold further comprises the following steps:
[0016] Applying adhesive to the core head at the bottom of the sand core;
[0017] The bottom core head of the sand core is installed in the first groove of the lower sand mold, and the adhesive is waited to solidify so that the sand core and the lower sand mold are completely fixed.
[0018] In an practicable solution, before closing the upper mold on the lower mold, the method further includes:
[0019] Filling an upper sand mold in an upper box of the upper casting mold;
[0020] The upper sand mold forms a second groove, and the second groove at least matches with the upper surfaces of the core heads at both ends of the sand core.
[0021] In one feasible solution, the sand core is a complex crankshaft structure.
[0022] In an practicable solution, a half mold forming method is characterized by comprising the following steps:
[0023] The positioning of the Haff mold sand core head is completed according to the positioning method described above;
[0024] pouring a molding liquid into the casting mold of the half mold;
[0025] After the molding liquid is cooled and molded, the mold is removed to obtain the half mold.
[0026] In one feasible solution, it includes:
[0027] A lower casting mold, the lower casting mold comprising a lower box body and a lower sand mold, the lower sand mold is filled in the lower box body and forms a first groove for mounting the sand core;
[0028] A sand core, wherein a core head at the bottom of the sand core is fixed in the first groove of the lower sand mold;
[0029] The bonding layer is evenly distributed between the bottom core head of the sand core and the lower sand mold;
[0030] An upper casting mold, the upper casting mold comprising an upper box and an upper sand mold, the upper sand mold is filled in the upper box and the upper casting mold is covered on top of the lower casting mold;
[0031] Sealing strips are arranged above the core heads at both ends of the sand core.
[0032] In an implementable solution, the sand core includes a core bone and at least one layer of graphite coating, the core bone is arranged inside the sand core, and at least one layer of graphite coating is coated on the surface of the sand core.
[0033] In an implementable scheme, it also includes an entgate, a straight runner and a cross runner, the entgate is arranged in the upper mold and the lower mold, the straight runner is arranged in the upper mold, the cross runner is arranged in the upper mold and the lower mold, and the entgate, the straight runner and the cross runner are interconnected.
[0034] This application has the following beneficial effects:
[0035] 1. Applying adhesive to the core head at the bottom of the sand core can prevent the sand core from moving horizontally during casting, thereby improving the center degree of the cast half mold and ensuring the accuracy of the inner hole of the half mold.
[0036] 2. Sealing strips are set on the core heads on both sides of the sand core to prevent the sand core from floating during casting, thereby improving the centering degree of the cast half mold and ensuring the accuracy of the inner hole of the half mold.
[0037] 3. Setting core bones in the sand core can improve the strength of the sand core and facilitate the lifting of the sand core. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the technical solution of the implementation scheme of the present application, the drawings required for use in the implementation scheme will be briefly introduced below. It should be understood that the following drawings only show certain implementation schemes of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0039] Figure 1 This is a schematic diagram of the process of fixing the core head of the Hough mold sand core in one embodiment of the present application;
[0040] Figure 2 This is a schematic diagram of the cooperation between the half mold and the sand core of this application;
[0041] Figure 3 for Figure 1 Schematic diagram of the cooperation between the middle half mold and the sand core from top view;
[0042] Figure 4 for Figure 1 Schematic diagram of the cross section at AA;
[0043] Figure 5 It is a schematic diagram of the state where the sand core is installed in the casting mold;
[0044] Figure 6 for Figure 4 Schematic diagram of the cross section at BB;
[0045] Figure 7 This is a schematic diagram of the positional relationship of the sand core at the junction of the upper and lower casting molds in one embodiment of the present application;
[0046] Figure 8 This is a schematic diagram of the positional relationship in which the sand core is completely located in the lower casting mold in one embodiment of the present application;
[0047] Fig. 9 This is a schematic diagram of the positional relationship in which the sand core is completely located in the upper mold in one embodiment of the present application;
[0048] Fig.10 This is a schematic diagram of the left and right halves of the Huff mold.
[0049] Fig.11 This is a schematic diagram of a circular sand core structure in one embodiment of the present application;
[0050] Fig.12 This is a schematic diagram of a rectangular sand core structure in one embodiment of the present application;
[0051] Fig.13 This is a schematic diagram of a polygonal sand core structure in one embodiment of the present application;
[0052] Fig.14 This is a schematic diagram of the crankshaft sand core structure in one embodiment of the present application.
[0053] Component number:
[0054] 1. Half mold; 2. Sand core; 3. Casting mold; 31. Upper casting mold; 311. Ingate; 312. Straight runner; 313. Horizontal runner; 314. Pouring cup; 32. Lower casting mold. DETAILED DESCRIPTION
[0055] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0056] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
[0057] Embodiment 1
[0058] like Figure 1 As shown, a Haff mold sand core positioning method comprises the following steps:
[0059] Make sand core 2;
[0060] In this embodiment, the material of the sand core 2 is preferably furan resin sand;
[0061] Lifting the sand core 2, and fixing the bottom core head of the sand core 2 to the lower casting mold 32;
[0062] In this embodiment, the sand core 2 is fixedly connected to the lower sand mold in the lower casting mold 32, so that the sand core 2 can be prevented from moving forward, backward, left, and right during casting.
[0063] Sealing strips are respectively arranged above the core heads at both ends of the sand core 2;
[0064] In this embodiment, the Figure 2-4 and Figure 11-14 A sealing strip is added at the position shown by the dotted line frame to prevent the sand core 2 from floating up and down during casting, thereby ensuring the accuracy of the inner hole of the half mold 1 during casting.
[0065] The upper mold 31 is placed on top of the lower mold 32 so that the upper mold 31 presses the sealing strip.
[0066] In this embodiment, the upper casting mold 31 includes an upper box body and an upper sand mold. When the box is closed, the upper sand mold presses the sealing strip, and the sealing strip presses the sand core 2, so that the sand core 2 does not move up and down during casting.
[0067] In this embodiment, a core bone is arranged inside the sand core 2, wherein the core bone is welded by steel bars to improve the strength of the sand core 2, and the diameter of the steel bars is preferably φ20 mm. In addition, at least one layer of graphite coating is applied on the surface of the sand core 2, preferably, two layers of graphite coating are applied to prevent defects such as sticky sand and sand holes from occurring in the casting during casting;
[0068] In this embodiment, before fixing the bottom of the sand core 2 to the lower casting mold 32, the following steps are also included:
[0069] Fill the lower sand mold in the lower box of the lower casting mold 32;
[0070] A first groove is formed in the lower sand mold, and the first groove is used to fit and accommodate the sand core 2 .
[0071] In this embodiment, the shape of the first groove formed in the lower sand mold includes circular / rectangular / polygonal / crankshaft shape.
[0072] In this embodiment, hoisting the sand core 2 and fixing the bottom core head of the sand core 2 to the lower casting mold 32 also includes the following steps:
[0073] Apply adhesive to the bottom core of the sand core 2;
[0074] In this embodiment, the above-mentioned adhesive is an adhesive specifically used for fixing the sand core.
[0075] Install the bottom core head of the sand core 2 in the first groove of the lower sand mold, wait for the adhesive to solidify, so that the sand core 2 and the lower sand mold are completely fixed to prevent the sand core 2 from moving forward and backward or left and right during casting (such as Figure 5 The inner hole defect of the Hough mold 1 is caused by the
[0076] like Figure 11-14 As shown, in this embodiment, the shape of the sand core 2 can be semicircular, rectangular, polygonal, or crankshaft-shaped.
[0077] In this embodiment, before the upper mold 31 is placed on the lower mold 32, the following steps are also included:
[0078] Filling the upper sand mold in the upper box of the upper casting mold 31;
[0079] The upper sand mold forms a second groove that matches the upper surface of the sand core 2 .
[0080] In this embodiment, the second groove formed by the upper sand mold corresponds to the shape of the upper surface of the sand core 2, which can be circular / rectangular / polygonal / crankshaft-shaped, such as Figure 6 As shown, when the upper casting mold 31 and the lower casting mold 32 are combined, the groove of the upper sand mold is pressed on the sealing strip, and the sealing strip is pressed on the sand core 2, thereby preventing the sand core 2 from moving during the casting process.
[0081] like Figure 7 As shown, in this embodiment, when the upper part of the sand core 2 is located in the upper casting mold 31 and the lower part is located in the lower casting mold 32, the lower sand mold in the lower casting mold 32 is provided with a first groove matching the lower surface of the sand core 2, and the upper sand mold in the upper casting mold 31 is provided with a second groove matching the upper surface of the sand core 2. An adhesive is applied to the bottom of the sand core 2 to fix it to the lower sand mold to prevent the sand core 2 from moving back and forth or left and right during casting. Sealing strips are provided at both ends of the upper surface of the sand core 2, and the upper sand mold presses the sealing strips to prevent the sand core 2 from moving up and down during casting, thereby ensuring the inner hole accuracy of the casting mold.
[0082] like Figure 8 As shown, in this embodiment, when the sand core 2 is completely located in the lower casting mold, the lower sand mold in the lower casting mold 32 is provided with a first groove matching the lower surface of the sand core 2, the upper sand mold in the upper casting mold 31 protrudes into the lower casting mold 32 and is provided with a second groove matching the upper surface of the sand core 2, and an adhesive is applied to the bottom of the sand core 2 to fix it with the lower sand mold to prevent the sand core 2 from moving back and forth and left and right during casting. Sealing strips are provided at both ends of the upper surface of the sand core 2, and the upper sand mold presses the sealing strips to prevent the sand core 2 from moving up and down during casting, thereby ensuring the inner hole accuracy of the casting mold.
[0083] like Fig. 9As shown, in this embodiment, when the sand core 2 is completely located in the upper casting mold, the lower sand mold of the lower casting mold 32 protrudes into the upper casting mold 31 and is provided with a first groove that matches the lower surface of the sand core 2, and the upper sand mold in the upper casting mold 31 protrudes into the lower casting mold 32 and is provided with a second groove that matches the upper surface of the sand core 2. An adhesive is applied to the bottom of the sand core 2 to fix it to the lower sand mold to prevent the sand core 2 from moving back and forth or left and right during casting. Sealing strips are provided at both ends of the upper surface of the sand core 2, and the upper sand mold presses the sealing strips to prevent the sand core 2 from moving up and down during casting, thereby ensuring the inner hole accuracy of the casting mold.
[0084] Embodiment 2
[0085] A half mold forming method comprises the following steps:
[0086] The positioning of the Huff mold sand core head is completed according to the “Huff mold sand core positioning method” described in “Example 1”;
[0087] Pouring the molding liquid into the mold of the half mold;
[0088] In this embodiment, the molding liquid can be a molten metal such as iron, copper, aluminum, etc.
[0089] After the molding liquid is cooled and molded, the mold is removed to obtain a half mold.
[0090] Embodiment 3
[0091] A half mold forming device, comprising a sand core 2, an upper casting mold 31, a lower casting mold 32, a sealing strip and an adhesive layer;
[0092] The lower casting mold 32 includes a lower box body and a lower sand mold. The lower box body is placed horizontally, the lower sand mold is filled in the lower box body, and a first groove for installing the sand core 2 is formed inside. The core head at the bottom of the sand core 2 is fixed in the first groove of the lower sand mold, and the adhesive layer is evenly distributed between the sand core 2 and the first groove, so that the bottom of the sand core 2 can be completely fixed to the lower sand mold; the upper casting mold 31 is covered on the top of the lower casting mold 32, including an upper box body and an upper sand mold. The upper sand mold is filled in the upper box body, and a second groove for installing the sand core 2 is formed. The second groove of the upper sand mold cooperates with the upper surface of the sand core 2. The sealing strip exists between the upper surface of the sand core 2 and the groove of the upper sand mold (i.e., the core head positions on both sides of the sand core 2), and is pressed by the upper sand mold, so that the sand core 2 will not move up and down during casting.
[0093] In this embodiment, a core bone is arranged inside the sand core 2. The core bone is welded by steel bars to improve the strength of the sand core 2. The diameter of the steel bars is preferably φ20 mm. In addition, at least one layer of graphite coating is applied on the surface of the sand core 2. Preferably, two layers of graphite coating are applied to prevent defects such as sand sticking and sand holes from occurring in the casting during casting.
[0094] like Figure 6As shown, in the present embodiment, the upper sand mold of the upper casting mold 31 is provided with an inner runner 311, a straight runner 312 and a cross runner 313. During casting, a pouring cup 314 is connected to the upper end of the straight runner 312, and then the casting liquid is poured into the pouring cup 314. The casting liquid completely fills the upper and lower sand molds through the inner runner 311, the straight runner 312 and the cross runner 313, thereby forming a half mold 1. Since the core head at the bottom of the sand core 2 is fixed to the lower sand mold, and the core heads on both sides are also fixed with sealing strips, the sand core 2 can maintain its position unchanged during casting, thereby ensuring the center degree of the inner hole of the half mold 1.
[0095] In this embodiment, an inner runner 311 and a runner 313 are provided in the lower mold 32 for forming the half mold.
[0096] like Fig.10 As shown, the left and right halves of the half mold 1 cast using the above-mentioned device are in assembled state.
[0097] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. A method for positioning a core head of a Huff mold sand core, characterized in that: The following steps are involved: Making sand core (2); Lifting the sand core (2), and fixing the bottom core head of the sand core (2) to the lower casting mold (32); Sealing strips are respectively arranged above the core heads at both ends of the sand core (2); The upper mold (31) is placed on top of the lower mold (32) so that the upper mold (31) presses the sealing strip.
2. The positioning method according to claim 1, characterized in that: Making the sand core (2) also includes the following steps: A core bone is arranged inside the sand core (2); At least one layer of graphite coating is provided on the surface of the sand core (2).
3. The positioning method according to claim 1, characterized in that: The process of hoisting the sand core (2) and fixing the bottom of the sand core (2) to the lower casting mold (32) also includes: Filling a lower sand mold in the lower box of the lower casting mold (32); A first groove is formed in the lower sand mold, and the first groove is used to fit and accommodate the sand core (2).
4. The positioning method according to claim 3, characterized in that: The process of hoisting the sand core (2) and fixing the bottom core head of the sand core (2) to the lower casting mold (32) further comprises the following steps: Applying adhesive to the bottom core of the sand core (2); The bottom core head of the sand core (2) is installed in the first groove of the lower sand mold, and the adhesive is waited to solidify so that the sand core (2) and the lower sand mold are completely fixed.
5. The positioning method according to claim 1, characterized in that: Before the upper casting mold (31) is closed on the lower casting mold (32), the method further comprises: Filling an upper sand mold into the upper box of the upper casting mold (31); The upper sand mold forms a second groove, and the second groove at least matches the upper surfaces of the core heads at both ends of the sand core (2).
6. The positioning method according to claim 1, characterized in that: The sand core (2) is a complex crankshaft structure.
7. A half mold forming method, characterized in that: The following steps are involved: The positioning method according to any one of claims 1 to 6 is used to complete the positioning of the core head of the Hough mold sand core; pouring a molding liquid into the casting mold of the half mold; After the molding liquid is cooled and molded, the mold is removed to obtain the half mold.
8. A half mold forming device, characterized in that: include: A lower casting mold (32), the lower casting mold (32) comprising a lower box and a lower sand mold, the lower sand mold is filled in the lower box and forms a first groove for mounting the sand core (2); A sand core (2), wherein a core head at the bottom of the sand core (2) is fixed in the first groove of the lower sand mold; An adhesive layer is evenly distributed between the bottom core head of the sand core (2) and the lower sand mold; An upper casting mold (31), the upper casting mold (31) comprising an upper box and an upper sand mold, the upper sand mold is filled in the upper box, and the upper casting mold (31) is covered on top of the lower casting mold (32); Sealing strips are arranged above the core heads at both ends of the sand core (2).
9. The half mold forming device according to claim 8, characterized in that: The sand core (2) comprises a core bone and at least one layer of graphite coating, wherein the core bone is arranged inside the sand core, and the at least one layer of graphite coating is coated on the surface of the sand core.
10. The half mold forming device according to claim 8, characterized in that: It also includes an entrant (311), a straight runner (312) and a runner (313), wherein the entrant (311) is arranged in the upper mold and the lower mold, the straight runner is arranged in the upper mold, the runner (313) is arranged in the upper mold and the lower mold, and the entrant (311), the straight runner (312) and the runner (313) are interconnected.