Negative pressure forming device for thin-wall casting
By using a threaded connection and a limiting boss for quick positioning and sealing, combined with radial equal arc guide grooves and double sealing, the problems of insufficient mold positioning accuracy and uneven flow guidance are solved, achieving efficient forming of thin-walled castings and equipment stability.
Patent Information
- Application Number
- CN202520469139.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-17
AI Technical Summary
In traditional negative pressure casting processes, insufficient positioning accuracy of mold assembly leads to sealing failure, which easily causes air leakage at high temperatures. Uneven flow guidance system causes cooling plate misalignment, and the connection between the pouring pipe and the cooling plate is prone to intermittent flow, affecting the quality of thin-walled castings and the life of equipment.
The system employs a quick-positioning sealing structure with threaded connection and limiting boss, combined with radial equal arc guide grooves and double seals to achieve uniform negative pressure conduction. Through the air guide channel and linkage with the negative pressure machine, the displacement of the cooling plate is controlled to ensure the stability of the cavity and the molding accuracy.
It improves assembly efficiency and airtightness, ensures uniform distribution of negative pressure, reduces stress concentration, and enhances the forming quality of thin-walled castings and equipment life.
Smart Images
Figure CN223876058U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to thin walled casting manufacturing technical field, specifically to a thin walled casting negative pressure forming device. BACKGROUND
[0002] The utility model relates to thin walled casting manufacturing technical field. In traditional negative pressure casting process, the sealing failure caused by the insufficient positioning precision of mould assembly often affects the stability of negative pressure, and when rigid sealing structure is used, gap leakage is easy to occur under high temperature, and repeated disassembly and assembly are easy to wear, reducing the service life of equipment. The existing flow guide system mostly adopts single channel design, and uneven negative pressure distribution is easy to cause the deviation of cooling plate, resulting in the wall thickness deviation and surface defects of casting.
[0003] In addition, the fixed connection mode of pouring pipe and cooling plate is easy to cause intermittent flow of metal liquid when moving under pressure, forming cold separation or filling deficiency. In view of the above problems, it is urgent to develop a casting device with rapid positioning sealing, uniform negative pressure conduction and dynamic stable pouring to improve the forming quality and process reliability of thin walled casting. UTILITY MODEL CONTENT
[0004] (I) technical problem solved
[0005] In view of the deficiencies of the prior art, the utility model provides a thin walled casting negative pressure forming device, which solves the problems raised in the above background technology.
[0006] (II) technical scheme
[0007] In order to achieve the above purpose, the utility model realizes the following technical scheme: a thin walled casting negative pressure forming device, characterized by comprising a base and an upper cover, the upper cover is opened on the base, a first cavity is opened in the base, a limiting ring is fixedly connected on the outer circular surface of the first cavity, a cooling plate is slidably arranged in the first cavity, the cooling plate is fixedly connected with a flow guide pipe, a first opening is opened on the base, the flow guide pipe is fixedly connected with a casting furnace at the end away from the cooling plate, the flow guide pipe is slidably connected with the first opening, a second opening is opened on the upper cover, the second opening is fixedly connected with a gas guide pipe, and the gas guide pipe is fixedly connected with a negative pressure machine.
[0008] Preferably, a plurality of first flow guide grooves are also opened on the upper cover, a plurality of second flow guide grooves are opened on the side close to the base of the first flow guide groove, the first flow guide groove is connected with the second opening in a penetrating manner, a gas guide channel is opened in the gas guide pipe, one end of the gas guide channel is connected with the second opening in a penetrating manner, and the other end of the gas guide channel is fixedly connected with the negative pressure machine.
[0009] Preferably, an outer thread is fixedly arranged on the outer circumferential surface of the base, an inner thread is arranged on the inner circumferential surface of the upper cover, the outer thread is threadedly connected with the inner thread, the base is fixedly connected with a limiting boss at one end close to the upper cover, and a limiting slot is further arranged on the surface of the upper cover close to the base.
[0010] Preferably, the first flow guide groove is arranged with equal arcs with the axis of the second opening as the core.
[0011] Preferably, the second flow guide groove is arranged at equal intervals along the radial direction of the first flow guide groove.
[0012] Preferably, the cooling plate is arranged between the limiting ring and the upper cover.
[0013] (Three) beneficial effects
[0014] The thin-wall casting negative pressure forming device has the following beneficial effects:
[0015] 1. The elastic fitting of the threaded connection and the limiting boss realizes the quick positioning and sealing of the upper cover and the base, improves the assembly efficiency and air tightness, the negative pressure machine linkage air guide channel and the radial divergence type flow guide groove are used to form a uniform negative pressure adsorption field, accurately control the displacement of the cooling plate, and improve the thin-wall casting forming efficiency, the equal-interval flow guide grooves are arranged in equal arcs, the negative pressure is uniformly transmitted in the circumferential direction, stress concentration is reduced, and the surface quality is improved, the rubber limiting boss and the cooling plate are combined to form a double-sealing structure, the cavity stability under high temperature and high pressure is maintained, the equipment life is prolonged, and the forming precision is guaranteed. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a front view structural schematic diagram of the utility model;
[0017] Figure 2 It is a top view structural schematic diagram of the utility model;
[0018] Figure 3 It is Figure 2 A-A sectional view structural schematic diagram.
[0019] In the figure: 11, base; 12, first cavity; 13, limiting ring; 14, cooling plate; 15, first opening; 16, flow guide pipe; 17, outer thread; 18, limiting boss; 20, upper cover; 21, inner thread; 22, limiting slot; 23, second opening; 24, first flow guide groove; 25, second flow guide groove; 26, air guide pipe; 27, air guide channel; 28, negative pressure machine. DETAILED DESCRIPTION
[0020] The utility model embodiment provides a thin-wall casting negative pressure forming device, which has the following beneficial effects: Figures 1-3As shown, including the base 11, the first cavity 12, the limit ring 13, the cooling plate 14, the first opening 15, the flow guide pipe 16, the outer thread 17, the limit boss 18, the upper cover 20, the inner thread 21, the limit slot 22, the second opening 23, the first flow guide groove 24, the second flow guide groove 25, the air guide pipe 26, the air guide channel 27, the negative pressure machine 28.
[0021] As shown Figures 1-3 The upper cover 20 is provided on the base 11, the first cavity 12 is provided in the base 11, the limit ring 13 is fixedly connected to the outer circular surface of the first cavity 12, the cooling plate 14 is slidingly arranged in the first cavity 12, the cooling plate 14 is fixedly connected with the flow guide pipe 16, the first opening 15 is provided on the base 11, the flow guide pipe 16 is fixedly connected with the casting furnace at the end away from the cooling plate 14, the flow guide pipe 16 is slidingly connected with the first opening 15, the second opening 23 is provided on the upper cover 20, the air guide pipe 26 is fixedly connected with the negative pressure machine 28, and the cooling plate 14 is arranged between the limit ring 13 and the upper cover 20.
[0022] A plurality of first flow guide grooves 24 are further provided on the upper cover 20, a plurality of second flow guide grooves 25 are provided on the side of the first flow guide groove 24 close to the base 11, the first flow guide groove 24 is connected with the second opening 23, the air guide channel 27 is provided in the air guide pipe 26, one end of the air guide channel 27 is connected with the second opening 23, and the other end of the air guide channel 27 is fixedly connected with the negative pressure machine 28.
[0023] The outer thread 17 is fixedly arranged on the outer circular surface of the base 11, the inner thread 21 is provided on the inner circular surface of the upper cover 20, the outer thread 17 is threadedly connected with the inner thread 21, the limit boss 18 is fixedly connected to the end of the base 11 close to the upper cover 20, the limit slot 22 is further provided on the side of the upper cover 20 close to the base 11, the limit boss 18 is matched with the upper cover 20, the limit boss 18 is made of rubber material, the limit boss 18 and the upper cover 20 further play a sealing role, the plurality of first flow guide grooves 24 are arranged at equal radians with the axis of the second opening 23 as the center, and the second flow guide grooves 25 are arranged at equal intervals along the radial direction of the first flow guide groove 24.
[0024] When the thin-walled casting negative pressure forming is performed, first, the limit slot 22 is aligned with the limit boss 18, then the upper cover 20 is provided on the base 11, the inner thread 21 on the upper cover 20 is threadedly connected with the outer thread 17, the casting furnace is started, and the casting furnace delivers the pouring liquid to the cooling plate 14 through the flow guide pipe 16.
[0025] Then, the negative pressure machine 28 is started, the negative pressure machine 28 generates negative pressure in the air guide channel 27, the air guide channel 27 generates negative pressure between the cooling plate 14 and the upper cover 20 through the second opening 23, the first flow guide groove 24 and the second flow guide groove 25, so that the cooling plate 14 moves towards the upper cover 20, until the cooling plate 14 contacts the upper cover 20, finally, after the pouring liquid in the cooling plate 14 is cooled and solidified, the upper cover 20 is opened, and the solidified thin-wall casting is taken out.
[0026] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A negative pressure forming apparatus for thin-walled castings, characterised in that: Including base (11) and upper cover (20), the upper cover (20) is opened in the base (11), the first cavity (12) is opened in the base (11), the outer circle of the first cavity (12) is fixedly connected with the limiting ring (13), the cooling plate (14) is slidably arranged in the first cavity (12), the cooling plate (14) is fixedly connected with the flow guide pipe (16), the first opening (15) is opened in the base (11), the flow guide pipe (16) is fixedly connected with the casting furnace at the end away from the cooling plate (14), the flow guide pipe (16) is slidably connected with the first opening (15), the second opening (23) is opened in the upper cover (20), the second opening (23) is fixedly connected with the air guide pipe (26), the air guide pipe (26) is fixedly connected with the negative pressure machine (28).
2. The apparatus according to claim 1, wherein: The upper cover (20) is also provided with a plurality of first flow guide grooves (24), a plurality of second flow guide grooves (25) are opened on the side close to the base (11) of the first flow guide groove (24), the first flow guide groove (24) is connected with the second opening (23) in a penetrating manner, the air guide channel (27) is opened in the air guide pipe (26), one end of the air guide channel (27) is connected with the second opening (23) in a penetrating manner, the other end of the air guide channel (27) is fixedly connected with the negative pressure machine (28).
3. A negative pressure forming device for thin-walled castings according to claim 2, characterized in that: The outer thread (17) is fixedly arranged on the outer circle of the base (11), the inner thread (21) is opened on the inner circle of the upper cover (20), the outer thread (17) is threadedly linked with the inner thread (21), the limiting boss (18) is fixedly connected with the end of the base (11) close to the upper cover (20), the limiting slot (22) is also opened on the side of the upper cover (20) close to the base (11), the limiting boss (18) is matched with the upper cover (20).
4. The apparatus according to claim 2, wherein: A plurality of first flow guide grooves (24) are arranged at equal arcs with the axis of the second opening (23) as the core.
5. The apparatus according to claim 2, wherein: The second flow guide grooves (25) are arranged at equal intervals along the radial direction of the first flow guide grooves (24).
6. The apparatus according to claim 1, wherein: The cooling plate (14) is arranged between the limiting ring (13) and the upper cover (20).