Method for producing y-block sand core

Abstract

The application discloses a production method of a Y-shaped test block sand core, and belongs to the technical field of casting, and aims to solve the problems of slag inclusion and undercooling caused by the fact that the Y-shaped test block is not cleaned by pouring sand and assembling and pouring need to be pressed, and the problem of increased operation procedures caused by the pressing, and comprises the following steps: 1) a core package for forming the Y-shaped test block is designed according to the structure of the Y-shaped test block, and a cavity for forming the external contour and the internal structure of the Y-shaped test block is arranged in the core package; and 2) the core package is split into a first sand core, a second sand core and a third sand core according to a horizontal core assembling mode, the first sand core is used for forming the external contour of the Y-shaped test block, the second sand core is used for forming the internal structure of the Y-shaped test block, and the third sand core is used for forming the pouring system of the Y-shaped test block. Through the horizontal insertion type core assembling mode, the problem that the core package needs to be pressed is avoided, and the problem that the sand core is drifted due to buoyancy when metal liquid is poured is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a sand core manufacturing method. BACKGROUND

[0002] The Y-shaped test block is a general single-casting test block of nodular cast iron. When the cast product is delivered, the performance of the test block is used as the basis for judging the performance of the casting. For castings with a weight of less than 2000 kg and a wall thickness of less than 200 mm, the single-casting test block is used for the castings.

[0003] At present, most foundries discard the pouring system and use a single sand mold for convenience in molding when pouring the Y-shaped test block, which leads to the problems of slag inclusion in the test block or excessively fast cooling speed, affecting the mechanical properties; or the test block is divided into two molds, and then a heavy mold is pressed on the sand mold, which increases the operation difficulty and working strength of the on-site operators. SUMMARY

[0004] In view of the problems of slag inclusion and overcooling caused by the incomplete sand cleaning of the Y-shaped test block during the whole-core pouring, and the increased operation process caused by the need for pressing during the split assembly pouring, it is necessary to propose a Y-shaped test block sand core manufacturing method.

[0005] A Y-shaped test block sand core manufacturing method, comprising,

[0006] 1) A mold core package for forming a Y-shaped test block is designed according to the structure of the Y-shaped test block, and a mold cavity for forming the external contour and internal structure of the Y-shaped test block is arranged in the mold core package;

[0007] 2) The mold core package is split into a first sand core, a second sand core, and a third sand core according to the horizontal core assembly method, the first sand core is used to form the external contour of the Y-shaped test block, the second sand core is used to form the internal structure of the Y-shaped test block, and the third sand core is used to form the pouring system of the Y-shaped test block.

[0008] Further, in order to facilitate the assembly of the first sand core and the second sand core, a gap is arranged between the first sand core and the second sand core, and the size of the gap is 1mm-2mm.

[0009] Further, paint is applied to the cavity or surface of the first sand core, the second sand core, and the third sand core in contact with the metal liquid to avoid the problem of sand sticking to the surface of the casting caused by the direct contact of the high-temperature metal liquid with the sand core.

[0010] The beneficial effects of the technical scheme of the present application are as follows: by changing the mold core assembly method to the horizontal insertion type core assembly method, the problem of needing to press the mold core package is avoided, and the problem of the sand core drifting due to the buoyancy during the pouring of the metal liquid is also avoided, and naked pouring without pressing the mold core package or clamping is realized. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic view of a longitudinal section of a Y-shaped test block;

[0012] Figure 2 is a schematic view of a first sand core;

[0013] Figure 3 is a schematic view of a second sand core;

[0014] Figure 4 is a schematic view of a third sand core. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions of the present application, the technical solutions of the present application are described in detail in conjunction with the drawings. Obviously, the following description is some typical embodiments of the present application, and other solutions can be obtained by those skilled in the art without creative labor on the basis of these embodiments.

[0016] Taking a Y25 test block as an example, the implementation of the technical solutions of the present patent application is described in detail.

[0017] A method for manufacturing a sand core of a Y-shaped test block, comprising,

[0018] 1) A core pack for forming a Y-shaped test block is designed according to the structure of the Y-shaped test block, and the core pack is provided with a cavity for forming the external contour and internal structure of the Y-shaped test block; (the external contour of the core pack is a cube or a cuboid, and the cavity for forming the external contour and internal structure of the Y-shaped test block and a pouring system are provided inside)

[0019] 2) The core pack is split into a first sand core, a second sand core and a third sand core according to the horizontal core assembly method, the first sand core is used to form the external contour of the Y-shaped test block, the second sand core is used to form the internal structure of the Y-shaped test block, and the third sand core is used to form the pouring system of the Y-shaped test block; specifically, the first sand core is an inner core, the second sand core is an outer core, and the first sand core is inserted into the second sand core.

[0020] As a supplement to the present embodiment, the assembly process of the core pack is as follows:

[0021] 1) The second sand core is placed on a horizontal work platform;

[0022] 2) The first sand core is horizontally pushed into or inserted into the second sand core from one side of the second sand core to form a complete cavity of the Y-shaped test block;

[0023] 3) The third sand core is embedded into the combination of the assembled first sand core and second sand core from the vertical direction downward.

[0024] As a supplement to the embodiment, in order to facilitate the assembly of the first sand core and the second sand core, a gap is arranged between the first sand core and the second sand core, the size of the gap is 1mm-2mm, and the first sand core and the second sand core need to be kept in a horizontal state during assembly, so as to avoid scratching between the sand cores and avoid the scattered sand entering the cavity to cause the casting to be sand-included.

[0025] As a further supplement to the embodiment, in order to ensure that the first sand core can be smoothly assembled into the second sand core, a convex ridge can be arranged on the mating surface of the second sand core and the first sand core, and a groove is arranged on the corresponding surface of the first sand core, and through the mutual cooperation of the convex ridge and the groove, the first sand core and the second sand core are well matched. At the same time, the convex ridge and the groove need to avoid the cavity of the Y-shaped test block and the part with small sand iron.

[0026] As a further supplement to the embodiment, in order to further ensure that the Y-shaped test block will not be displaced due to the buoyancy or expansion force of the metal liquid during pouring, a lock core structure is further arranged between the first sand core and the second sand core; specifically, the lock core structure includes a through hole arranged on the first sand core and the second sand core and a locking piece used to lock the first sand core and the second sand core, the locking piece can be a pin, a screw, etc., after the first sand core and the second sand core are assembled in place, the first sand core and the second sand core are locked by the locking piece, avoiding the movement of the positions of the two.

[0027] As another supplement to the embodiment, a coating is applied to the cavity or surface of the first sand core, the second sand core and the third sand core in contact with the metal liquid, to avoid the high-temperature metal liquid directly contacting the sand core to cause the casting surface to be sand-included.

[0028] As another supplement to the embodiment, the third sand core is a pouring system, and a pouring auxiliary device such as a sprue cup or a sprue basin is arranged thereon to receive the metal liquid, which can play a clamping and pressing role on the third sand core, increase the resistance of the third sand core to the buoyancy and expansion force of the metal liquid, and reduce the risk of displacement of the third sand core.

[0029] The above embodiments are only a description of a typical application of the technical solutions of the present application, and reasonable extensions can be made on the basis of reasonable and non-creative labor.

Claims

1. A method of making a Y-block sand core, characterized by, The application relates to a Y-shaped test block and a manufacturing method thereof. According to the structural design of the Y-shaped test block, a core package for forming the Y-shaped test block is arranged with a cavity for forming the external contour and the internal structure of the Y-shaped test block; According to the horizontal core assembling mode, the core package is split into a first sand core, a second sand core and a third sand core, the first sand core is used for forming the external contour of the Y-shaped test block, the second sand core is used for forming the internal structure of the Y-shaped test block, and the third sand core is used for forming the pouring system of the Y-shaped test block; The second sand core is arranged on a horizontal operation platform; The first sand core is horizontally pushed into or inserted into the second sand core from one side of the second sand core to form the complete cavity of the Y-shaped test block; The third sand core is downwardly embedded into the combination of the first sand core and the second sand core in the vertical direction.

2. The method of making a Y-block sand core of claim 1, wherein, A gap is arranged between the first sand core and the second sand core.

3. The method of making a Y-block sand core of claim 1 wherein, A convex ridge is arranged on the matching surface of the second sand core and the first sand core, and a concave groove is arranged on the corresponding surface of the first sand core, so that the first sand core and the second sand core are well matched through the mutual matching of the convex ridge and the concave groove.

4. The method of making a Y-block sand core of claim 1 wherein, A lock core structure is further arranged between the first sand core and the second sand core.

5. The method of making a Y-block sand core according to claim 4, wherein, The lock core structure comprises through holes arranged on the first sand core and the second sand core and a clamping element used for locking the first sand core and the second sand core.

6. The method of making a Y-block sand core of claim 1 wherein, Coating is applied to the cavity or surface of the first sand core, the second sand core and the third sand core in contact with the metal liquid.

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