Multi-outlet long-oil-way sand core for pouring engine casing

Abstract

The utility model discloses a multi-outlet long oil-way sand core for pouring an engine casing, which is characterized in that a base center hole is formed in the center of a casing base, four base mounting holes are symmetrically formed in the periphery of the casing base, and an annular oil-way sand core surrounding the base center hole for more than half a circle is arranged in the side wall of the base center hole; the head end of the annular oil way sand core is connected with the side wall oil hole of the base center hole, the middle section and the tail end of the annular oil way sand core are connected with four arc-shaped oil way sand cores in the tangential direction, and the tail ends of the arc-shaped oil way sand cores are connected with the side wall oil holes of the base installation holes respectively. A plurality of supporting columns extending downwards are arranged at the bottoms of the annular oil way sand core and the arc-shaped oil way sand cores in the length direction, sand core positioning pins are arranged at the lower ends of the supporting columns, each sand core positioning pin is of a structure with the wide upper portion and the narrow lower portion, and the lower ends of the sand core positioning pins are embedded into the sand mold positioning grooves respectively. The annular oil way sand core is formed by assembling a plurality of sections, and the opposite ends of the sections are connected in a lap joint mode through half tenons. The utility model can solve the problems of fracture and deformation of a thin and long oil way in a thin wall, and improves the yield of castings.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil circuit sand core, especially to a multi-outlet long oil circuit sand core for engine casing pouring belongs to magnesium alloy pouring technical field. BACKGROUND

[0002] Magnesium alloy is usually cast by sand casting, magnesium alloy liquid is poured into a sand mold cavity that is suitable for the shape of the part, and after it cools and solidifies, a blank or part is obtained. The engine casing casting includes a center low and four sides high casing base, one end of the casing base is connected with two upward vertical split side wall mounting seats, the other end of the casing base is connected with an upward vertical integral side wall mounting seat; the center of the casing base is provided with a base center hole, and four base mounting holes are symmetrically arranged around the base center hole.

[0003] The inner walls of the base center hole and each base mounting hole are respectively provided with oil grooves, and the oil grooves of each hole must be connected through the built-in oil holes to reduce the external oil pipe. Since the contour size of the engine casing casting is about 1100mm x 700mm x 1150mm, the total length of the oil circuit in the casting is more than 4m, and the trend is complex, the wall thickness of the overall oil circuit is 4-6mm, the oil circuit structure forming difficulty is big, and the oil circuit cleaning difficulty is also big. SUMMARY

[0004] The purpose of this section is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above and / or problems existing in the prior art, the present utility model is proposed.

[0006] The purpose of the utility model is to overcome the problems existing in the prior art, provide a multi-outlet long oil circuit sand core for engine casing pouring, which can solve the problem of fracture and deformation of thin-walled long oil circuit and improve the yield of castings.

[0007] In order to solve the above technical problems, the utility model discloses a multi -outlet long oil way sand core for engine casing pouring, the engine casing includes the casing base of center low four -around high, the center of casing base is equipped with base center hole, and four base mounting holes are symmetrically arranged around base center hole, and the side wall of base center hole is equipped with annular oil way sand core around the half -circle of base center hole, the head of annular oil way sand core is connected with the side wall oil hole of base center hole, and the middle section and the tail of annular oil way sand core are connected with four arc oil way sand cores along the tangential direction, and the tail of each arc oil way sand core is connected with the side wall oil hole of each base mounting hole respectively, the bottom of annular oil way sand core and each arc oil way sand core is equipped with a plurality of downward extending support columns along the length direction, and the lower end of each support column is equipped with sand core positioning pin, and each sand core positioning pin is wide at the top and narrow at the bottom and is embedded in the corresponding sand mould positioning groove respectively.

[0008] Further, oil way positioning gaps are respectively arranged between each half tenon, process hole positioning gaps are respectively arranged between each sand core positioning pin and corresponding sand mould positioning groove, and each oil way positioning gap and process hole positioning gap is filled with paint respectively.

[0009] Further, the length of each segment annular oil way sand core is 300-400mm, and the spacing between adjacent sand core positioning pins is 120-150mm.

[0010] Further, each oil way positioning gap and process hole positioning gap is 0.3mm.

[0011] Compared with the prior art, the utility model has the following beneficial effects: 1, the long oil way sand core is disassembled into multiple short oil way sand cores according to the structure, the length of each short oil way sand core is 300-400mm, process hole positioning is arranged on each oil way sand core, and structural deformation of the oil way sand core during casting can be effectively reduced;

[0012] 2, positioning is arranged between two adjacent oil way sand cores, the oil way positioning gap is 0.3mm, the process hole positioning gap between the oil way process hole positioning and the sand mould positioning is 0.3mm, the accuracy of the oil way assembly size is ensured, after the oil way assembly is completed, all gap positions are brushed and filled with paint, and the generation of excess materials such as flash and casting tumor in the oil way of the casting is reduced;

[0013] 3, the four arc oil way sand cores are connected with the annular oil way sand core through the tangential direction, and the last one is connected at the tail of the annular oil way sand core, the flow channel resistance is reduced, and sand cleaning is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings described in the following are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings. The drawings are provided for reference and description only, and are not intended to limit the present application. Among them:

[0015] Figure 1 The structure diagram of the engine case casting in the present application;

[0016] Figure 2 The structure diagram of the oil path sand core in the present application;

[0017] Figure 3 The structure diagram of the oil path sand core after being segmented and disassembled;

[0018] Figure 4 The sectional view of the oil path sand core;

[0019] In the figure: the engine case casting: 1a. The case base; 1a1. The base center hole; 1a2. The base mounting hole; 1b. The split type side wall mounting seat; 1c. The integral type side wall mounting seat;

[0020] 2. The annular oil path sand core; 2a. The half tenon; 2b. The oil path positioning gap; 3. The arc-shaped oil path sand core; 4. The support column; 5. The sand core positioning pin; 6. The sand mold; 6a. The sand mold positioning groove; 6b. The process hole positioning gap. DETAILED DESCRIPTION

[0021] In the following description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not mean that the device must have a particular orientation.

[0022] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the following will further describe the present application in combination with specific drawings. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments.

[0023] 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 the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0024] As Figure 1As shown, the engine case includes a center low and four high case base 1a, one end of the case base 1a is connected with two upward vertical split side wall mounting seat 1b, the other end of the case base 1a is connected with the upward vertical integral side wall mounting seat 1c. The center of the case base 1a is provided with a base center hole 1a1, four base mounting holes 1a2 are symmetrically arranged around the base center hole 1a1, the upper end surface of the four base mounting hole regions is a slope with high outer periphery and low middle, and the base center hole 1a1 is the lowest part of the case base 1a, and the case base 1a is thick.

[0025] As Figures 2 to 4 As shown, the side wall of the base center hole 1a1 is provided with an annular oil channel core 2 surrounding the base center hole 1a1, the head end of the annular oil channel core 2 is connected with the side wall oil hole of the base center hole, and the middle segment and the tail end of the annular oil channel core 2 are connected with four arc-shaped oil channel cores 3 along the tangential direction, and the tail end of each arc-shaped oil channel core 3 is connected with the side wall oil hole of each base mounting hole.

[0026] The annular oil channel core 2 is assembled by multiple segments along the length direction, the opposite ends of each segment are connected by half tenon 2a, and oil channel positioning gap 2b is arranged between each half tenon 2a, and each oil channel positioning gap 2b is 0.3mm. The length of each segment of the annular oil channel core 2 is 300-400mm, and the distance between the adjacent sand core positioning pins 5 is 120-150mm.

[0027] The bottom of the annular oil channel core 2 and each arc-shaped oil channel core 3 is provided with a plurality of downward extending support columns 4 along the length direction, the lower end of each support column 4 is provided with a sand core positioning pin 5, each sand core positioning pin 5 is wide at the upper end and narrow at the lower end, and the lower end is embedded in the corresponding sand mold positioning groove 6a of the sand mold 6.

[0028] The process hole positioning gap 6b is arranged between each sand core positioning pin 5 and the corresponding sand mold positioning groove 6a, each process hole positioning gap 6b is 0.3mm, which ensures the accuracy of the oil channel assembly size, and after the oil channel assembly is completed, all gap positions are brushed and filled with paint.

[0029] The above merely describes preferred and feasible embodiments of the present application, shows and describes the basic principles, main features and advantages of the present application, and is not intended to limit the patent protection scope of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. In addition to the above embodiments, the present application can also have other implementation manners without departing from the spirit and scope of the present application. The present application can also have various changes and improvements, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present application. The protection scope of the present application is defined by the appended claims and their equivalents. The technical features not described in the present application can be realized by or using the prior art, and will not be described here.

Claims

1. A multi-outlet long oil channel sand core for casting an engine case, the engine case comprising a center-low and periphery-high case base, the center of the case base being provided with a base center hole, and four base mounting holes being symmetrically provided around the base center hole, characterized in that: an annular oil channel sand core is provided in the side wall of the base center hole and surrounds more than half of the base center hole, a head end of the annular oil channel sand core is connected with an oil hole in the side wall of the base center hole, and a middle section and a tail end of the annular oil channel sand core are tangentially connected with four arc-shaped oil channel sand cores, and tail ends of the arc-shaped oil channel sand cores are respectively connected with oil holes in the side walls of the base mounting holes; the bottom of the annular oil channel sand core and the bottom of each arc-shaped oil channel sand core are provided with a plurality of downward extending support columns along the length direction, and the lower end of each support column is provided with a sand core positioning pin, each sand core positioning pin has a structure of being wide at the upper end and narrow at the lower end, and the lower end of each sand core positioning pin is embedded in a corresponding sand mold positioning groove; the annular oil channel sand core is assembled by a plurality of sections along the length direction, and the facing end heads of the sections are connected with each other by half dowels. An oil channel positioning gap is respectively provided between each half dowel, a process hole positioning gap is respectively provided between each sand core positioning pin and the corresponding sand mold positioning groove, and each oil channel positioning gap and process hole positioning gap is filled with paint. The length of each section of the annular oil channel sand core is 300-400 mm, and the distance between adjacent sand core positioning pins is 120-150 mm. Each oil channel positioning gap and process hole positioning gap is 0.3 mm.

2. The multi-outlet long-oil-line core for engine case casting according to claim 1, characterized in that: ​ 3. The multi-outlet long-oil-line core for engine case casting according to claim 1, characterized in that: ​ 4. The multi-outlet long-oil-line core for engine case casting according to claim 1 or 2 or 3, characterized in that: ​

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