Sand core structure of slender zigzag oil way

Abstract

The utility model discloses a sand core structure of a slender zigzag oil way, which comprises a slender sand core body extending along the oil way in the thin wall of an aircraft engine case, end supports are respectively arranged at two ends of the slender sand core body, and a plurality of auxiliary hole sand cores are connected to the outer wall of the slender sand core body along the length direction. Each auxiliary hole sand core points to the outer wall or the inner wall of the aircraft engine case and is embedded in the sand mold; the slender sand core body is formed by assembling a plurality of sections in the length direction, the opposite ends of the sections are connected in a lap joint mode through half tenons respectively, and paint is coated between the matching faces of the half tenons. And a central air hole is formed along the axis of the slender sand core body. The length of the sand core body is 400 mm or above, and the diameter of the sand core body is not larger than 6 mm. The problems of fracture and deformation of a thin and long oil way in a thin wall can be solved, the risks of suffocation and insufficient casting of the oil way of the magnesium-aluminum alloy casting are reduced, sand cleaning operation of workers is facilitated, and the casting yield is improved.

Description

Technical Field

[0001] This utility model relates to an oil channel sand core, and more particularly to a sand core structure with a slender and tortuous oil channel, belonging to the field of magnesium alloy casting technology. Background Technology

[0002] In actual production, products with oil passages are very difficult to process and cannot be formed by other methods such as stamping, forging, or machining. The most common method is casting. First, a sand core that matches the shape of the oil passage is made. The sand core is then placed into the mold cavity, and molten alloy is poured into the cavity. After it cools and solidifies, a blank is obtained. The sand core is then removed to obtain the casting product with oil passages.

[0003] The slender oil passages on aircraft engine casings can be over 400mm long and have a tortuous shape, with a diameter of only 6mm. Simply using molds for core making is difficult due to the irregular structure; mold fabrication is complex, time-consuming, and difficult to disassemble. Furthermore, the strength cannot be guaranteed during production, making it prone to deformation, breakage, and difficulties in later sand removal. Other methods using water glass or ceramic cores result in high gas generation and poor gas dispersion in the oil passages, easily causing gas trapping in the casting, leading to porosity, incomplete filling, or cracks, ultimately resulting in the scrapping of the entire casting and significant economic losses.

[0004] In addition, traditional narrow oil channels make it difficult to remove sand in the later stages, resulting in high labor intensity, low work efficiency, harm to physical and mental health, and poor results. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] The purpose of this invention is to overcome the problems existing in the prior art and provide a sand core structure with a slender and tortuous oil circuit, which can solve the problem of fracture and deformation of complex oil circuits in castings and improve the casting yield.

[0008] To solve the above technical problems, this utility model provides a sand core structure for a slender and tortuous oil passage, comprising a slender sand core body extending along the oil passage in the thin wall of an aircraft engine casing. The slender sand core body has end supports at both ends. Multiple process hole sand cores are connected to the outer wall of the slender sand core body along its length. Each process hole sand core points towards the outer or inner wall of the aircraft engine casing and is embedded in a sand mold. The slender sand core body is assembled from multiple segments along its length, with the opposing ends of each segment connected by interlocking half-tenons. The mating surfaces of the half-tenons are coated with a paint.

[0009] Furthermore, a central vent is provided along the axis of the slender sand core body.

[0010] Furthermore, the length of the sand core body is 400mm or more, and the diameter is no more than 6mm.

[0011] Compared with the prior art, this utility model has achieved the following beneficial effects: 1. By supporting the slender oil circuit and assembling it after splitting it into multiple short oil circuit segments, and then filling all gaps with paint after the oil circuit is assembled, the generation of excess material such as burrs and casting nodules in the oil circuit of the casting can be reduced. This can effectively solve the problems of structural deformation or fracture caused by the oil circuit during the assembly and baking process, which is conducive to controlling the wall thickness of the aircraft engine, meeting the needs of aircraft designers without changing the design, reducing costs and increasing efficiency, and reducing economic losses.

[0012] 2. A central vent hole is set along the axis of the slender oil passage to facilitate the venting of sand cores, reduce the risk of air blockage and insufficient pouring in the oil passage of magnesium-aluminum alloy castings, and improve the product qualification rate; it also facilitates the sand cleaning operation of workers, greatly reduces the labor intensity of workers, significantly improves work efficiency, and protects the physical and mental health of workers. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0014] Figure 1 This is a schematic diagram of the oil circuit routing in the casting of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the oil passage sand core before assembly in this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the oil passage sand core after assembly in this utility model;

[0017] In the figure: 1. Slender sand core body; 1a. Half tenon; 1b. Central vent; 2. Process hole sand core. Detailed Implementation

[0018] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0019] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0021] like Figures 1 to 3 As shown, the sand core structure of this utility model for a slender and tortuous oil passage includes a slender sand core body 1 extending along the oil passage in the thin wall of an aircraft engine casing. The length of the sand core body is 400 mm or more, and the diameter is no more than 6 mm. End supports 2 are provided at both ends of the slender sand core body 1. Multiple process hole sand cores 2 are connected to the outer wall of the slender sand core body 1 along its length. Each process hole sand core 2 is embedded in a sand mold and points towards the outer or inner wall of the aircraft engine casing. In principle, the process hole sand cores 2 are easy to repair by welding after cleaning.

[0022] The slender sand core body 1 is assembled from multiple segments along its length. The opposing ends of each segment are connected to each other by half tenons 1a. The gap between the mating surfaces of the half tenons 1a ensures the accuracy of the oil circuit assembly dimensions. After the oil circuit is assembled, paint is used to fill all gaps.

[0023] A central vent 1b is provided along the axis of the slender sand core body 1 to improve the venting effect during the casting process.

[0024] After the sand is cleaned, the corresponding positions of the sand cores 2 in each process hole are repaired by welding.

[0025] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A sand core structure for an elongated tortuous oil passage comprising an elongated sand core body extending along the oil passage in a thin wall of an aircraft engine nacelle, characterized in that: The two ends of the elongated sand core body are respectively provided with end supports, and the outer wall of the elongated sand core body is connected with a plurality of process hole sand cores along the length direction, each of which is directed to the outer wall or the inner wall of the engine case of the airplane and is embedded in the sand mold; the elongated sand core body is assembled by multiple segments along the length direction, and the opposite ends of each segment are connected by half tenons, and the matching surfaces of the half tenons are coated with paint.

2. The elongated serpentine oil passage sand core structure of claim 1, wherein: A central air hole is arranged along the axis of the elongated sand core body.

3. The elongated serpentine oil passage sand core structure according to claim 1 or 2, characterized by: The length of the sand core body is 400 mm or more, and the diameter is not greater than 6 mm.

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