Casting mold device for special-shaped super-long semi-closed titanium alloy casting

Abstract

The utility model discloses a casting mold device of a special-shaped super-long semi-closed titanium alloy casting, which comprises a casting mold, a mold core structure is transversely arranged in the casting mold, a solution circulation channel is formed between the mold core structure and a casting mold cavity, the mold core structure comprises a mold core I and a mold core II which are connected with each other, and a screw rod is horizontally arranged in the mold core I; space angle spigots are arranged between the two side faces of the end, away from the mold core II, of the mold core I and the casting mold 1, the mold core structure is further connected with the casting mold through bolts, and fastening bolt openings used for allowing the bolts to be inserted are reserved in the mold core I. According to the device, wedge-shaped threads are fully used for preventing looseness, gaps are increased in an inner cavity, and the deformability of the graphite mold core is improved; and the stability is improved through matching of the process seam allowance, so that high-quality forming of the semi-closed titanium alloy casting is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of titanium alloy casting mold design in the field of nonferrous metal casting, in particular to a casting mold device for special-shaped super-long semi-enclosed titanium alloy castings. Background Art

[0002] Titanium alloy has the characteristics of high specific strength, corrosion resistance, heat resistance, etc., and is often used as the preferred material for weight reduction of new high-strength parts, especially in special fields such as aviation, aerospace, high-end equipment manufacturing and other key areas.

[0003] Although titanium alloys have broad application prospects, they are often expensive due to the limitations of titanium alloy raw materials and their manufacturing costs, resulting in the lower-than-expected development of the titanium alloy industry. At present, forgings and machined parts (especially titanium alloy products with complex shapes, multiple spatial structures, and small batches) are usually replaced with castings to maximize material utilization and reduce production costs.

[0004] In addition, due to the high specific strength of titanium alloy (density of 4.5g / cm 3 About 56% of steel), so when designing the structure of titanium alloy castings, according to the stress characteristics of the product, some products will design the inner cavity as a semi-enclosed cavity structure to achieve lightweight indicators. This will cause the core of the mold of such products to be a core structure with one side suspended. The existing casting material is usually graphite material, which has low material strength. Especially when encountering a special-shaped single cantilever structure with a long distance, since some product molds can only be assembled horizontally, they will be affected by gravity and leverage. The impact of the metal solution during the filling process will cause the core in the semi-enclosed area to sway, and the wall thickness of the product after molding will be uneven; in severe cases, the core will break from the root, resulting in the loss of the inner cavity structure and the product being scrapped.

[0005] To address this problem, the industry has opened a process structure on the core structure to connect it to other casting structures for reliable connection, that is, adjusting the semi-suspended assembly state to a rigid combination structure with multi-directional connections to improve the accuracy of the casting cavity. After casting and molding of this solution, the additional process structure will produce process holes, resulting in incomplete product appearance molding, and the casting process hole position needs to be repaired and trimmed later. This solution has a complex process and there are differences between the welding structure and the casting structure, which will cause stress concentration at the process hole repair welding position, affecting service stability. In particular, titanium alloy structural parts in some special use occasions are not allowed to open process holes for repair welding, which makes manufacturing very difficult. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a casting device for special-shaped and extra-long semi-enclosed titanium alloy castings, which makes full use of wedge-shaped threads to prevent loosening, increases the lateral locking torque in the inner cavity, increases the gap to improve the yield of the graphite core, and improves stability through the cooperation of process stoppers, so as to achieve high-quality molding of semi-enclosed titanium alloy castings.

[0007] The utility model is realized by the following technical solutions:

[0008] A casting device for a special-shaped super-long semi-enclosed titanium alloy casting comprises a casting mold, wherein a core structure is transversely arranged in the casting mold, a solution flow channel is formed between the core structure and the casting mold cavity, the core structure comprises a core I and a core II connected to each other, and a screw is horizontally arranged in the core I;

[0009] Space angle stops are arranged between the two side surfaces of the core I away from one end of the core II and the casting mold 1. The core structure is also connected to the casting mold by bolts, and fastening bolt openings for inserting bolts are reserved on the core I.

[0010] Furthermore, the core I and the core II are threadedly connected.

[0011] Furthermore, the thread form is a wedge thread.

[0012] Furthermore, a gap of 0.5-2 mm is reserved between the middle position of the screw and the core I, and nuts I are arranged between the two ends of the screw and the core I.

[0013] Furthermore, the screw is made by solution treatment of nickel-based cast high-temperature alloy K409.

[0014] Furthermore, the screw rod and the nut I are connected by a wedge thread.

[0015] Furthermore, both ends of the bolt are connected by a nut II, and the number of the bolts is 2.

[0016] Furthermore, the casting mold includes an upper casting mold and a lower casting mold that are snap-fitted together, and the core structure and the casting mold are positioned via square process holes.

[0017] Furthermore, the core I is a special-shaped extra-long structure, and the core II is a special-shaped structure.

[0018] The beneficial effects of the utility model are:

[0019] (1) The super-long special-shaped core I and the core II of the utility model are connected by a wedge-shaped thread, which utilizes the self-locking property of the wedge-shaped thread to ensure effective connection while preventing the core from coming out and changing its size;

[0020] (2) A high-temperature alloy screw is passed through the interior of the core I and is clamped by nuts I at both ends, which improves the rigidity of the super-long core I. The core I has high strength during the filling process and improves product quality;

[0021] (3) No need to open other process holes, the product structure strength is higher;

[0022] (4) A gap is reserved between the core I and the screw. This hollow graphite core improves its own yieldability, which is beneficial to reduce the surface defects caused by the obstructed shrinkage of the inner cavity, thereby improving product quality;

[0023] (5) The screw and nut connection inside the core I can increase the lateral locking torque, improve the rigidity, and reduce the weight of the graphite itself. The above two points work together to improve the problem of the mold cavity size changing due to the core being bent downward under the action of gravity due to the lack of rigidity during the lateral assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the core structure of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the casting mold of the utility model;

[0026] Figure numerals: 1. casting mold, 101. upper casting mold, 102. lower casting mold, 2. spatial angle stop, 3. fastening bolt mouth, 4. core I, 5. core II, 6. nut I, 7. screw, 8. nut II, 9. bolt, 10. square process hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0028] Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] As shown in the figure, a casting device for a special-shaped and extra-long semi-closed titanium alloy casting includes a casting mold 1, in which a core structure is laterally arranged, and a solution flow channel is formed between the core structure and the mold cavity of the casting mold 1. The core structure includes a core I4 and a core II5 that are interconnected, wherein the core I4 is a special-shaped and extra-long structure, and the core II5 is a special-shaped structure.

[0031] The core I4 and the core II5 are connected by threads, and the thread form is a wedge thread, and the axial self-locking performance of the wedge thread is used to ensure that it will not fall out during the casting process after tightening;

[0032] A screw 7 is horizontally arranged in the core Ⅰ4; the screw 7 is made of nickel-based casting high-temperature alloy K409 by solid solution treatment, and nuts Ⅰ6 are arranged between the two ends of the screw 7 and the core Ⅰ, and the screw 7 and the nut Ⅰ6 are connected by a wedge thread. A 0.5-2mm gap is reserved between the middle position of the screw 7 and the core Ⅰ4. This hollow graphite core improves its own yieldability, which is conducive to reducing the surface defects caused by the blocked shrinkage of the inner cavity, and improves the product quality.

[0033] The mold 1 includes an upper mold 101 and a lower mold 102 which are fastened together. The core structure is positioned with the mold 1 via a square process hole 10. Space angle stops 2 are provided between the two side surfaces of the core Ⅰ4 and the mold 1. A fastening bolt opening 3 for inserting bolts 9 is reserved on the core Ⅰ4. After the core structure and the mold 1 are assembled, they are fastened and connected via bolts 9 and nuts Ⅱ8 to improve the stability of the core.

[0034] Installation process:

[0035] 1. First, insert the screw 7 into the core Ⅰ4, screw the nuts Ⅰ6 at both ends and tighten them;

[0036] 2. Connect the core Ⅰ4 and core Ⅱ5 by threads and tighten them;

[0037] 3. The integral core structure is installed into the lower casting mold 102, and the assembly accuracy of the two is ensured through the spatial angle stop 2;

[0038] 4. The upper mold 101 and the lower mold 102 are assembled and matched through the square process hole 10 to ensure assembly accuracy;

[0039] 5. Insert the bolt 9 into the fastening bolt opening 3 reserved in the core Ⅰ4, screw in the nuts Ⅱ8 at both ends, tighten in the up and down directions, and complete the installation.

[0040] The basic principles, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A casting device for special-shaped and extra-long semi-enclosed titanium alloy castings, characterized in that: The invention comprises a casting mold (1), wherein a core structure is transversely arranged in the casting mold (1), a solution flow channel is formed between the core structure and the casting mold (1) cavity, the core structure comprises a core I (4) and a core II (5) connected to each other, and a screw (7) is horizontally arranged in the core I (4); Space angle stoppers (2) are provided between the two side surfaces of the core I (4) away from one end of the core II (5) and the casting mold (1); the core structure is also connected to the casting mold (1) via bolts (9); and fastening bolt openings (3) for inserting the bolts (9) are reserved on the core I (4).

2. The casting device for special-shaped ultra-long semi-enclosed titanium alloy casting according to claim 1 is characterized in that: The core I (4) and the core II (5) are threadedly connected.

3. The casting device for a special-shaped super-long semi-enclosed titanium alloy casting according to claim 2 is characterized in that: The thread form is a wedge thread.

4. The casting device for special-shaped ultra-long semi-enclosed titanium alloy casting according to claim 1 is characterized in that: A gap of 0.5-2 mm is reserved between the middle position of the screw rod (7) and the mold core I (4), and nuts I (6) are arranged between the two ends of the screw rod (7) and the mold core I.

5. A casting device for special-shaped ultra-long semi-enclosed titanium alloy castings according to claim 1 or 4, characterized in that: The screw (7) is made of nickel-based casting high-temperature alloy K409 through solid solution treatment.

6. The casting device for special-shaped ultra-long semi-enclosed titanium alloy casting according to claim 4, characterized in that: The screw rod (7) and the nut I (6) are connected by a wedge thread.

7. The casting device for special-shaped ultra-long semi-enclosed titanium alloy casting according to claim 1, characterized in that: The two ends of the bolt (9) are connected by nuts II (8), and the number of the bolts (9) is 2.

8. The casting device for special-shaped and extra-long semi-enclosed titanium alloy casting according to claim 1, characterized in that: The casting mold (1) comprises an upper casting mold (101) and a lower casting mold (102) which are arranged in a buckled manner, and the core structure and the casting mold (1) are positioned via a square process hole (10).

9. The casting device for special-shaped ultra-long semi-enclosed titanium alloy casting according to claim 1, characterized in that: The core I (4) is a special-shaped super-long structure, and the core II (5) is a special-shaped structure.

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